VHS is a standard for consumer-level analog video recording on tape cassettes. Developed by Victor Company of Japan in the early 1970s, it was released in Japan on September 9, 1976, and in the United States on August 23, 1977.
From the 1950s, magnetic tape video recording became a major contributor to the television industry, via the first commercialized video tape recorders. At that time, the expensive devices were used only in professional environments such as television studios and medical imaging. In the 1970s, videotape entered home use, creating the home video industry and changing the economics of the television and movie businesses. The television industry viewed videocassette recorders as having the power to disrupt their business, while television users viewed the VCR as a means to take control of their viewing experience.
In the 1970s and early 1980s, there was a format war in the home video industry. Two of the standards, VHS and Betamax, received the most media exposure. VHS eventually won the war, dominating 60 percent of the North American market by 1980 and emerging as the dominant home video format throughout the tape media period.
Optical disc formats later began to offer better quality than analog consumer video tape such as VHS and S-VHS. The earliest of these formats, LaserDisc, was not widely adopted across Europe, but was hugely popular in Japan and a minor success in the United States. After the introduction of the DVD format in 1996, however, the market share for VHS began to decline. In 2003 DVD rentals surpassed those of VHS in the United States and by 2008, DVD had replaced VHS as the preferred low-end method of distribution. The last known company in the world to manufacture VHS equipment, Funai of Japan, ceased production in July 2016, citing shrinking demand and difficulties procuring parts.
Prior to VHSIn 1956, following several attempts by other companies, the first commercially successful VTR, the Ampex VRX-1000, was introduced by Ampex Corporation. At a price of US$50,000 in 1956, and US$300 for a 90-minute reel of tape, it was intended only for the professional market.
Kenjiro Takayanagi, a television broadcasting pioneer then working for JVC as its vice president, saw the need for his company to produce VTRs for the Japan market, and at a more affordable price. In 1959, JVC developed a two-head video tape recorder, and by 1960 a color version for professional broadcasting. In 1964, JVC released the DV220, which would be the company's standard VTR until the mid-1970s.
In 1969, JVC collaborated with Sony Corporation and Matsushita Electric in building a video recording standard for the Japanese consumer. The effort produced the U-matic format in 1971, which was the first format to become a unified standard.
U-matic was successful in business and some broadcast applications, but due to cost and limited recording time very few of the machines were sold for home use.
Soon after, Sony and Matsushita broke away from the collaboration effort, in order to work on video recording formats of their own. Sony started working on Betamax, while Matsushita started working on VX. JVC released the CR-6060 in 1975, based on the U-matic format. Sony and Matsushita also produced U-matic systems of their own.
VHS developmentIn 1971, JVC engineers Yuma Shiraishi and Shizuo Takano put together a team to develop a consumer-based VTR.
By the end of 1971, they created an internal diagram titled "VHS Development Matrix", which established twelve objectives for JVC's new VTR:
- The system must be compatible with any ordinary television set.
- Picture quality must be similar to a normal air broadcast.
- The tape must have at least a two-hour recording capacity.
- Tapes must be interchangeable between machines.
- The overall system should be versatile, meaning it can be scaled and expanded, such as connecting a video camera, or dub between two recorders.
- Recorders should be affordable, easy to operate and have low maintenance costs.
- Recorders must be capable of being produced in high volume, their parts must be interchangeable, and they must be easy to service.
Competition with BetamaxIn 1974, the Japanese Ministry of International Trade and Industry, desiring to avoid consumer confusion, attempted to force the Japanese video industry to standardize on just one home video recording format. Later, Sony had a functional prototype of the Betamax format, and was very close to releasing a finished product. With this prototype, Sony persuaded the MITI to adopt Betamax as the standard, and allow it to license the technology to other companies.
JVC believed that an open standard, with the format shared among competitors without licensing the technology, was better for the consumer. To prevent the MITI from adopting Betamax, JVC worked to convince other companies, in particular Matsushita, to accept VHS, and thereby work against Sony and the MITI. Matsushita agreed, primarily out of concern that Sony might become the leader in the field if its proprietary Betamax format was the only one allowed to be manufactured. Matsushita also regarded Betamax's one-hour recording time limit as a disadvantage.
Matsushita's backing of JVC persuaded Hitachi, Mitsubishi, and Sharp to back the VHS standard as well. Sony's release of its Betamax unit to the Japanese market in 1975 placed further pressure on the MITI to side with the company. However, the collaboration of JVC and its partners was much stronger, and eventually led the MITI to drop its push for an industry standard. JVC released the first VHS machines in Japan in late 1976, and in the United States in mid 1977.
Sony's Betamax competed with VHS throughout the late 1970s and into the 1980s. Betamax's major advantages were its smaller cassette size, theoretical higher video quality, and earlier availability, but its shorter recording time proved to be a major shortcoming.
Originally, Beta I machines using the NTSC television standard were able to record one hour of programming at their standard tape speed of 1.5 inches per second . The first VHS machines could record for two hours, due to both a slightly slower tape speed and significantly longer tape. Betamax's smaller-sized cassette limited the size of the reel of tape, and could not compete with VHS's two-hour capability by extending the tape length. Instead, Sony had to slow the tape down to 0.787 ips in order to achieve two hours of recording in the same cassette size. This reduced Betamax's once-superior video quality to worse than VHS when comparing two-hour recording. Sony eventually released an extended Beta cassette which allowed NTSC Betamax to break the two-hour limit, but by then VHS had already won the format battle.
Additionally, VHS had a "far less complex tape transport mechanism" than Betamax, and VHS machines were faster at rewinding and fast-forwarding than their Sony counterparts.
Initial releases of VHS-based devicesThe first VCR to use VHS was the Victor HR-3300, and was introduced by the president of JVC in Japan on September 9, 1976. JVC started selling the HR-3300 in Akihabara, Tokyo, Japan on October 31, 1976. Region-specific versions of the JVC HR-3300 were also distributed later on, such as the HR-3300U in the United States, and HR-3300EK in the United Kingdom in January 1977. The United States received its first VHS-based VCR – the RCA VBT200 on August 23, 1977. The RCA unit was designed by Matsushita, and was the first VHS-based VCR manufactured by a company other than JVC. It was also capable of recording four hours in LP mode. The United Kingdom later received its first VHS-based VCR – the Victor HR-3300EK in 1978.
Quasar and General Electric would follow-up with VHS-based VCRs – all designed by Matsushita. By 1999, Matsushita alone produced just over half of all Japanese VCRs. TV VCR combos, combining a standard definition CRT TV with a VHS mechanism under the CRT, were also once available for purchase.
Cassette and tape designThe VHS cassette is a 187 mm wide, 103 mm deep, 25 mm thick plastic shell held together with five Phillips head screws. The flip-up cover, which allows players and recorders to access the tape, has a latch on the right side, with a push-in toggle to release it. The cassette has an anti-despooling mechanism, consisting of several plastic parts between the spools, near the front of the cassette. The spool latches are released by a push-in lever within a 6.35 mm hole at the bottom of the cassette, 19 mm in from the edge label. The tapes are made, pre-recorded, and inserted into the cassettes in cleanrooms, to ensure quality and to keep dust from getting embedded in the tape and interfering with recording
There is a clear tape leader at both ends of the tape to provide an optical auto-stop for the VCR transport mechanism. In the VCR, a light source is inserted into the cassette through the circular hole in the center of the underside, and two photodiodes are to the left and right sides of where the tape exits the cassette. When the clear tape reaches one of these, enough light will pass through the tape to the photodiode to trigger the stop function; some VCRs automatically rewind the tape when the trailing end is detected. Early VCRs used an incandescent bulb as the light source: when the bulb failed, the VCR would act is if a tape were present when the machine was empty, or would detect the blown bulb and completely stop functioning. Later designs use an infrared LED, which has a much longer life.
The recording medium is a Mylar magnetic tape, 12.7 mm wide, coated with metal oxide, and wound on two spools.
The tape speed for "Standard Play" mode is 3.335 cm/s for NTSC, 2.339 cm/s for PAL—or just over 2.0 and 1.4 metres per minute respectively. The tape length for a T-120 VHS cassette is 247.5 metres.
Tape loading techniqueAs with almost all cassette-based videotape systems, VHS machines pull the tape out from the cassette shell and wrap it around the inclined head drum which rotates at 1798.2 rpm in NTSC machines and at 1500 rpm for PAL, one complete rotation of the head corresponding to one video frame. VHS uses an "M-loading" system, also known as M-lacing, where the tape is drawn out by two threading posts and wrapped around more than 180 degrees of the head drum in a shape roughly approximating the letter M.
Recording capacityA VHS cassette holds a maximum of about 430 m of tape at the lowest acceptable tape thickness, giving a maximum playing time of about four hours in a T-240/DF480 for NTSC and five hours in an E-300 for PAL at "standard play" quality. More frequently however, VHS tapes are thicker than the required minimum to avoid complications such as jams or tears in the tape. Other speeds include "long play", and "extended play" or "super long play" . For NTSC, LP and EP/SLP doubles and triples the recording time accordingly, but these speed reductions cause a reduction in horizontal resolution – from the normal equivalent of 250 vertical scan lines lines in SP, to the equivalent of 230 in LP and even less in EP/SLP. The slower speeds cause a very noticeable reduction in linear audio track quality as well, as the linear tape speed becomes much lower than what is commonly considered a satisfactory minimum for audio recording. Color depth deteriorates significantly at lower speeds in PAL: often, a color image on a PAL tape recorded at low speed is displayed only in monochrome, or with intermittent color, when playback is paused.
Tape lengthsBoth NTSC and PAL/SECAM VHS cassettes are physically identical. However, as tape speeds differ between NTSC and PAL/SECAM, the playing time for any given cassette will vary accordingly between the systems. In order to avoid confusion, manufacturers indicate the playing time in minutes that can be expected for the market the tape is sold in. It is perfectly possible to record and play back a blank T-XXX tape in a PAL machine or a blank E-XXX tape in an NTSC machine, but the resulting playing time will be different from that indicated.
To calculate the playing time for a T-XXX tape in a PAL machine, use this formula:
To calculate the playing time for an E-XXX tape in an NTSC machine, use this formula:
- E-XXX indicates playing time in minutes for PAL or SECAM in SP and LP speeds.
- T-XXX indicates playing time in minutes for NTSC or PAL-M in SP, LP, and EP/SLP speeds.
- SP is Standard Play, LP is Long Play, EP/SLP is extended/super long play which was primarily released into the NTSC market.
Copy protectionAs VHS was designed to facilitate recording from various sources, including television broadcasts or other VCR units, content producers quickly found that home users were able to use the devices to copy videos from one tape to another. Despite the generation loss, this was regarded as a widespread problem, which the members of the Motion Picture Association of America claimed caused them great financial losses. In response, several companies developed technologies to protect copyrighted VHS tapes from casual duplication by home users.
The most popular method was Analog Protection System, better known simply as Macrovision, produced by a company of the same name. According to Macrovision:
"The technology is applied to over 550 million videocassettes annually and is used by every MPAA movie studio on some or all of their videocassette releases. Over 220 commercial duplication facilities around the world are equipped to supply Macrovision videocassette copy protection to rights owners...The study found that over 30% of VCR households admit to having unauthorized copies, and that the total annual revenue loss due to copying is estimated at $370,000,000 annually."
The system was first used in copyrighted movies beginning with the 1984 film The Cotton Club.
Macrovision copy protection saw refinement throughout its years, but has always worked by essentially introducing deliberate errors into a protected VHS tape's output video stream. These errors in the output video stream are ignored by most televisions, but will interfere with re-recording of programming by a second VCR. The first version of Macrovision introduces high signal levels during the vertical blanking interval, which occurs between the video fields. These high levels confuse the automatic gain control circuit in most VHS VCRs, leading to varying brightness levels in an output video, but are ignored by the TV as they are out of the frame-display period. "Level II" Macrovision uses a process called "colorstriping," which inverts the analog signal's colorburst period and causes off-color bands to appear in the picture. Level III protection added additional colorstriping techniques to further degrade the image.
These protection methods worked well to defeat analog-to-analog copying by VCRs of the time. Products capable of digital video recording are mandated by law to include features which detect Macrovision encoding of input analog streams, and reject copying of the video. Both intentional and false-positive detection of Macrovision protection has frustrated archivists who wish to copy now-fragile VHS tapes to a digital format for preservation. Devices marketed as "Video Stabilizers" may be used to attempt removal of the Macrovision copy protection mechanism.
Recording processThe recording process in VHS consists of the following steps, in this order:
- The tape is pulled from the supply reel by a capstan and pinch roller, similar to those used in audio tape recorders.
- The tape passes across the erase head, which wipes any existing recording from the tape.
- The tape is wrapped around the head drum, using a little more than 180 degrees of the drum.
- One of the heads on the spinning drum records one field of video onto the tape, in one diagonally oriented track.
- The tape passes across the audio and control head, which records the control track and the linear audio track or tracks.
- The tape is wound onto the take-up reel due to torque applied to the reel by the machine.
Video recordingThe tape path then carries the tape around the spinning head drum, wrapping it around a little more than 180 degrees in a helical fashion, assisted by the slanted tape guides. The head rotates constantly at 1798.2 rpm in NTSC machines, exactly 1500 in PAL, each complete rotation corresponding to one frame of video.
Two tape heads are mounted on the cylindrical surface of the drum, 180 degrees apart from each other, so that the two heads "take turns" in recording. The rotation of the head drum, combined with the relatively slow movement of the tape, results in each head recording a track oriented at a diagonal with respect to the length of the tape. This is referred to as helical scan recording.
To maximize the use of the tape, the video tracks are recorded very close together to each other. To reduce crosstalk between adjacent tracks on playback, an azimuth recording method is used: The gaps of the two heads are not aligned exactly with the track path. Instead, one head is angled at plus seven degrees from the track, and the other at minus seven degrees. This results, during playback, in destructive interference of the signal from the tracks on either side of the one being played.
Each of the diagonal-angled tracks is a complete TV picture field, lasting 1/60 of a second on the display. One tape head records an entire picture field. The adjacent track, recorded by the second tape head, is another 1/60 or 1/50 of a second TV picture field, and so on. Thus one complete head rotation records an entire NTSC or PAL frame of two fields.
The original VHS specification had only two video heads. Later models implemented at least one more pair of heads, which were used at the EP tape speed. In machines supporting VHS HiFi, yet another pair of heads was added to handle the VHS HiFi signal. Drums can contain 2, 4, 6 or 8 heads.
The high tape-to-head speed created by the rotating head results in a far higher bandwidth than could be practically achieved with a stationary head.
VHS tapes have approximately 3 MHz of video bandwidth and 400 kHz of chroma bandwidth. The luminance portion of the video is recorded as a frequency modulated, with a down-converted
"color under" chroma signal recorded directly at the baseband. Each helical track contains a single field encoded as an analog raster scan, similar to analog TV broadcasts. The horizontal resolution is 240 lines per picture height, or about 320 lines across a scan line, and the vertical resolution is the same as the respective analog TV standard. In modern-day digital terminology, NTSC VHS is roughly equivalent to 333×480 pixels luma and 40×480 chroma resolutions, while PAL VHS offers the equivalent of about 335×576 pixels luma and 40×576 chroma.
JVC countered 1985's SuperBeta with VHS HQ, or High Quality. The frequency modulation of the VHS luminance signal is limited to 3 megahertz, which makes higher resolutions technically impossible even with the highest-quality recording heads and tape materials, but an HQ branded deck includes luminance noise reduction, chroma noise reduction, white clip extension, and improved sharpness circuitry. The effect was to increase the apparent horizontal resolution of a VHS recording from 240 to 250 analog. The major VHS OEMs resisted HQ due to cost concerns, eventually resulting in JVC reducing the requirements for the HQ brand to white clip extension plus one other improvement.
In 1987, JVC introduced a new format called Super VHS which extended the bandwidth to over 5 megahertz, yielding 420 analog horizontal. Most Super VHS recorders can play back standard VHS tapes, but not vice versa. S-VHS was designed for higher resolution, but failed to gain popularity outside Japan because of the high costs of the machines and tapes. Because of the limited user base, Super VHS was never picked up to any significant degree by manufacturers of pre-recorded tapes, although it was used extensively in the low-end professional market for filming and editing.
Audio recordingAfter leaving the head drum, the tape passes over the stationary audio and control head. This records a control track at the bottom edge of the tape, and one or two linear audio tracks along the top edge.
Original linear audio systemIn the original VHS specification, audio was recorded as baseband in a single linear track, at the upper edge of the tape, similar to how an audio compact cassette operates. The recorded frequency range was dependent on the linear tape speed. For the VHS SP mode, which already uses a lower tape speed than the compact cassette, this resulted in a mediocre frequency response of roughly 100 Hz to 10 kHz for NTSC, frequency response for PAL VHS with its lower standard tape speed was somewhat worse. The signal-to-noise ratio was an acceptable 42 dB. Both parameters degraded significantly with VHS's longer play modes, with EP/NTSC frequency response peaking at 4 kHz. S-VHS tapes can give better audio quality, because the tapes are designed to have almost twice the bandwidth of VHS at the same speed.
Sound cannot be recorded on a VHS tape without recording a video signal, even in the audio dubbing mode. If there is no video signal to the VCR input, most VCRs will record black video and generate a control track while the sound is being recorded. Some early VCRs record audio without a control track signal; this is of little use, because the absence of a signal from the control track means that the linear tape speed is irregular during playback.
More sophisticated VCRs offer stereo audio recording and playback. Linear stereo fits two independent channels in the same space as the original mono audiotrack. While this approach preserves acceptable backward compatibility with monoaural audio heads, the splitting of the audio track degraded the signal's SNR, causing objectionable tape hiss at normal listening volume. To counteract the hiss, VCRs use Dolby B noise reduction for recording and playback. This dynamically boosts the mid-frequency band of the audio program on the recorded medium, improving its signal strength relative to the tape's background noise floor, then attenuates the mid-band during playback. Dolby B is not a transparent process, and Dolby-encoded program material exhibits an unnatural mid-range emphasis when played on VCRs that are not made to work with this form of noise reduction.
Another option is to use noise reduction similar to that of DBX—that is, by recording with high volume but with a compressed dynamic range. On playback the decompression will yield original audio; because weaker signals are attenuated, the hiss can also be significantly attenuated.
High-end consumer recorders take advantage of the linear nature of the audio track, as the audio track could be erased and recorded without disturbing the video portion of the recorded signal. Hence, "audio dubbing" and "video dubbing", where either the audio or video are re-recorded on tape, were supported features on prosumer linear video editing-decks. Without dubbing capability, an audio or video edit could not be done in-place on master cassette, and requires the editing output be captured to another tape, incurring generational loss.
Studio film releases began to emerge with linear stereo audiotracks in 1982. From that point onward nearly every home video release by Hollywood featured a Dolby-encoded linear stereo audiotrack. However, linear stereo was never popular with equipment makers or consumers.
Tracking adjustment and index markingAnother linear control track, at the tape's lower edge, holds pulses that mark the beginning of every frame of video; these are used to fine-tune the tape speed during playback, so that the high speed rotating heads remained exactly on their helical tracks rather than somewhere between two adjacent tracks. Since good tracking depends on precise distances between the rotating drum and the fixed control/audio head reading the linear tracks, which usually varies by a couple of micrometers between machines due to manufacturing tolerances, most VCRs offer tracking adjustment, either manual or automatic, to correct such mismatches.
The control track is also used to hold index marks, which were normally written at the beginning of each recording session, and can be found using the VCR's index search function: this will fast-wind forward or backward to the nth specified index mark, and resume playback from there. At times, higher-end VCRs provided functions for the user to manually add and remove these marks — so that, for example, they coincide with the actual start of the television program — but this feature later became hard to find.
By the late 1990s, some high-end VCRs offered more sophisticated indexing. For example, Panasonic's Tape Library system assigned an ID number to each cassette, and logged recording information both on the cassette and in the VCR's memory for up to 900 recordings.
Hi-Fi audio systemAround 1984, JVC added Hi-Fi audio to VHS Both VHS Hi-Fi and Betamax Hi-Fi delivered flat full-range frequency response, excellent 70 dB signal-to-noise ratio, dynamic range of 90 dB, and professional audio-grade channel separation. VHS Hi-Fi audio is achieved by using audio frequency modulation, modulating the two stereo channels on two different frequency-modulated carriers and embedding the combined modulated audio signal pair into the video signal. To avoid crosstalk and interference from the primary video carrier, VHS's implementation of AFM relied on a form of magnetic recording called depth multiplexing. The modulated audio carrier pair was placed in the hitherto-unused frequency range between the luminance and the color carrier, and recorded first. Subsequently, the video head erases and re-records the video signal over the same tape surface, but the video signal's higher center frequency results in a shallower magnetization of the tape, allowing both the video and residual AFM audio signal to coexist on tape.. During playback, VHS Hi-Fi recovers the depth-recorded AFM signal by subtracting the audio head's signal from the video head's signal, then demodulates the left and right audio channels from their respective frequency carriers. The end result of the complex process was audio of high fidelity, which was uniformly solid across all tape-speeds Since JVC had gone through the complexity of ensuring Hi-Fi's backward compatibility with non-Hi-Fi VCRs, virtually all studio home video releases produced after this time contained Hi-Fi audio tracks, in addition to the linear audio track. Under normal circumstances, all Hi-Fi VHS VCRs will record Hi-Fi and linear audio simultaneously to ensure compatibility with VCRs without Hi-Fi playback, though only early high-end Hi-Fi machines provided linear stereo compatibility.
The sound quality of Hi-Fi VHS stereo is comparable to some extent to the quality of CD audio, particularly when recordings were made on high-end or professional VHS machines that have a manual audio recording level control. This high quality compared to other consumer audio recording formats such as compact cassette attracted the attention of amateur and hobbyist recording artists. Home recording enthusiasts occasionally recorded high quality stereo mixdowns and master recordings from multitrack audio tape onto consumer-level Hi-Fi VCRs. However, because the VHS Hi-Fi recording process is intertwined with the VCR's video-recording function, advanced editing functions such as audio-only or video-only dubbing are impossible. A short-lived alternative to the hifi feature for recording mixdowns of hobbyist audio-only projects was a PCM adaptor so that high-bandwidth digital video could use a grid of black-and-white dots on an analog video carrier to give pro-grade digital sounds though DAT tapes made this obsolete.
Some VHS decks also had a "simulcast" switch, allowing users to record an external audio input along with off-air pictures. Some televised concerts offered a stereo simulcast soundtrack on FM radio and as such, events like Live Aid were recorded by thousands of people with a full stereo soundtrack despite the fact that stereo TV broadcasts were some years off. Other examples of this included network television shows such as Friday Night Videos and MTV for its first few years in existence. Likewise, some countries, most notably South Africa, provided alternate language audio tracks for TV programming through an FM radio simulcast.
The considerable complexity and additional hardware limited VHS Hi-Fi to high-end decks for many years. While linear stereo all but disappeared from home VHS decks, it was not until the 1990s that Hi-Fi became a more common feature on VHS decks. Even then, most customers were unaware of its significance and merely enjoyed the better audio performance of the newer decks.
Issues with Hi-Fi audioDue to the path followed by the video and Hi-Fi audio heads being striped and discontinuous—unlike that of the linear audio track—head-switching is required to provide a continuous audio signal. While the video signal can easily hide the head-switching point in the invisible vertical retrace section of the signal, so that the exact switching point is not very important, the same is obviously not possible with a continuous audio signal that has no inaudible sections. Hi-Fi audio is thus dependent on a much more exact alignment of the head switching point than is required for non-HiFi VHS machines. Misalignments may lead to imperfect joining of the signal, resulting in low-pitched buzzing. The problem is known as "head chatter", and tends to increase as the audio heads wear down.
Another issue that made VHS Hi-Fi imperfect for music is the inaccurate reproduction of levels which are not re-created as the original source.
Super-VHS / ADAT / SVHS-ETSeveral improved versions of VHS exist, most notably Super-VHS, an analog video standard with improved video bandwidth. S-VHS improved the horizontal luminance resolution to 400 lines. The audio system is the same. S-VHS made little impact on the home market, but gained dominance in the camcorder market due to its superior picture quality.
The ADAT format provides the ability to record multitrack digital audio using S-VHS media. JVC also developed SVHS-ET technology for its Super-VHS camcorders and VCRs, which simply allows them to record Super VHS signals onto lower-priced VHS tapes, albeit with a slight blurring of the image. Nearly all later Super-VHS camcorders and VCRs have SVHS-ET ability.
VHS-C / Super VHS-CAnother variant is VHS-Compact, originally developed for portable VCRs in 1982, but ultimately finding success in palm-sized camcorders. The longest tape available for NTSC holds 60 minutes in SP mode and 180 minutes in EP mode. Since VHS-C tapes are based on the same magnetic tape as full-size tapes, they can be played back in standard VHS players using a mechanical adapter, without the need of any kind of signal conversion. The magnetic tape on VHS-C cassettes is wound on one main spool and uses a gear wheel to advance the tape.
The adapter is mechanical, although early examples were motorized, with a battery. It has an internal hub to engage with the VCR mechanism in the location of a normal full-size tape hub, driving the gearing on the VHS-C cassette. Also, when a VHS-C cassette is inserted into the adapter, a small swing-arm pulls the tape out of the miniature cassette to span the standard tape path distance between the guide rollers of a full-size tape. This allows the tape from the miniature cassette to use the same loading mechanism as that from the standard cassette.
Super VHS-C or S-VHS Compact was developed by JVC in 1987. S-VHS provided an improved luminance and chrominance quality, yet S-VHS recorders were compatible with VHS tapes.
Sony was unable to shrink its Betamax form any further, so instead developed Video8/Hi8 which was in direct competition with the VHS-C/S-VHS-C format throughout the 80s, 90s, and 2000s. Ultimately neither format "won" and both have been superseded by digital high definition equipment.
W-VHS / Digital-VHS (high-definition)allowed recording of MUSE Hi-Vision analog high definition television, which was broadcast in Japan from 1989 until 2007. The other improved standard, called Digital-VHS, records digital high definition video onto a VHS form factor tape. D-VHS can record up to 4 hours of ATSC digital television in 720p or 1080i formats using the fastest record mode, and up to 49 hours of lower-definition video at slower speeds.
D9There is also a JVC-designed component digital professional production format known as Digital-S, or officially under the name D9, that uses a VHS form factor tape and essentially the same mechanical tape handling techniques as an S-VHS recorder. This format is the least expensive format to support a Sel-Sync pre-read for video editing. This format competed with Sony's Digital Betacam in the professional and broadcast market, although in that area Sony's Betacam family ruled supreme, in contrast to the outcome of the VHS/Betamax domestic format war. It has now been superseded by high definition formats.
AccessoriesShortly after the introduction of the VHS format, VHS tape rewinders were developed. These devices served the sole purpose of rewinding VHS tapes. Proponents of the rewinders argued that the use of the rewind function on the standard VHS player would lead to wear and tear of the transport mechanism. The rewinder would rewind the tapes smoothly and also normally do so at a faster rate than the standard rewind function on VHS players. However some rewinder brands did have some frequent abrupt stops, which occasionally led to tape damage.
Some devices were marketed which allowed a personal computer to use a VHS recorder as a data backup device. The most notable of these was ArVid, widely used in Russia and CIS states. Similar systems were manufactured in the United States by Corvus and Alpha Microsystems, and in the UK by Backer from Danmere Ltd.
Signal standardsVHS can record and play back all varieties of analog television signals in existence at the time VHS was devised. However, a machine must be designed to record a given standard. Typically, a VHS machine can only handle signals using the same standard as the country it was sold in. This is because some parameters of analog broadcast TV are not applicable to VHS recordings, the number of VHS tape recording format variations is smaller than the number of broadcast TV signal variations—for example, analog TVs and VHS machines are not interchangeable between the UK and Germany, but VHS tapes are. The following tape recording formats exist in conventional VHS :
Since the 1990s, dual and multi-standard VHS machines, able to handle a variety of VHS-supported video standards, became more common. For example, VHS machines sold in Australia and Europe could typically handle PAL, MESECAM for record and playback, and NTSC for playback only on suitable TVs. Dedicated multi-standard machines can usually handle all standards listed, and some high-end models could convert the content of a tape from one standard to another on the fly during playback by using a built-in standards converter.
S-VHS is only implemented as such in PAL/625/25 and NTSC/525/30; S-VHS machines sold in SECAM markets record internally in PAL, and convert between PAL and SECAM during recording and playback. S-VHS machines for the Brazilian market record in NTSC and convert between it and PAL-M.
A small number of VHS decks are able to decode closed captions on video cassettes before sending the full signal to the set with the captions. A smaller number still are able, additionally, to record subtitles transmitted with world standard teletext signals, simultaneously with the associated program. S-VHS has a sufficient resolution to record teletext signals with relatively few errors.
LogoThe VHS logo was commissioned by JVC and introduced with the JVC HR-3300 in 1976. It uses the Lee font, designed by Leo Weisz.
Uses in marketingVHS was popular for long-form content, such as feature films or documentaries, as well as short-play content, such as music videos, in-store videos, teaching videos, distribution of lectures and talks, and demonstrations. VHS instruction tapes were sometimes included with various products and services, including exercise equipment, kitchen appliances, and computer software.
Comparison to BetamaxVHS was the winner of a protracted and somewhat bitter format war during the late 1970s and early 1980s against Sony's Betamax format as well as other formats of the time.
Betamax was widely perceived at the time as the better format, as the cassette was smaller in size, and Betamax offered slightly better video quality than VHS – it had lower video noise, less luma-chroma crosstalk, and was marketed as providing pictures superior to those of VHS. However, the sticking point for both consumers and potential licensing partners of Betamax was the total recording time. To overcome the recording limitation, Beta II speed was released in order to compete with VHS's two-hour SP mode, thereby reducing Betamax's horizontal resolution to 240 lines. In turn, the extension of VHS to VHS HQ produced 250 lines, so that overall a typical Betamax/VHS user could expect virtually identical resolution.
Because Betamax was released more than a year before VHS, it held an early lead in the format war. However, by 1981, United States' Betamax sales had dipped to only 25-percent of all sales. There was debate between experts over the cause of Betamax's loss. Some, including Sony's founder Akio Morita, say that it was due to Sony's licensing strategy with other manufacturers, which consistently kept the overall cost for a unit higher than a VHS unit, and that JVC allowed other manufacturers to produce VHS units license-free, thereby keeping costs lower. Others say that VHS had better marketing, since the much larger electronics companies at the time supported VHS. Sony would make its first VHS players/recorders in 1988, although it continued to produce Betamax machines concurrently until 2002.
DeclineThe video cassette recorder was a mainstay in television-equipped American and European living rooms for more than twenty years from its introduction in 1977. The home television recording market, as well as the camcorder market, has since transitioned to digital recording on solid-state memory cards. The introduction of the DVD format to American consumers in March 1997 triggered the market share decline of VHS.
DVD rentals surpassed those on the VHS format in the United States for the first time in June 2003.
Though 94.5 million Americans still owned VHS format VCRs in 2005, market share continued to drop. In the mid-2000s, several retail chains in the United States and Europe announced they would stop selling VHS equipment. In the U.S., no major brick-and-mortar retailers stock VHS home-video releases, focusing only on DVD and Blu-ray media.
The last known company in the world to manufacture VHS equipment was Funai of Japan, who produced video cassette recorders under the Sanyo brand in China and North America. Funai ceased production of VHS equipment in July 2016, citing falling sales and a shortage of components.
Modern useDespite the decline in both VHS players and programming on VHS machines, they are still owned in some households worldwide. Those who still use or hold on to VHS do so for a number of reasons, including nostalgic value, ease of use in recording, keeping personal videos or home movies, watching content currently exclusive to VHS, and collecting. Some expatriate communities in the United States also obtain video content from their native countries in VHS format.
Although VHS has been discontinued in the United States, VHS recorders and blank tapes were still sold at stores in other developed countries prior to digital television transitions. As an acknowledgement of the continued use of VHS, Panasonic announced the world's first dual deck VHS-Blu-ray player in 2009. The last standalone JVC VHS-only unit was produced October 28, 2008. JVC, and other manufacturers, continued to make combination DVD+VHS units even after the decline of VHS.
A market for pre-recorded VHS tapes has continued, and some online retailers such as Amazon still sell new and used pre-recorded VHS cassettes of movies and television programs. None of the major Hollywood studios generally issue releases on VHS, the last major studio film to be released in the format in the United States, other than as part of special marketing promotions, was A History of Violence in 2006. In October 2008, Distribution Video Audio Inc., the last major American supplier of pre-recorded VHS tapes, shipped its final truckload of tapes to stores in America.
However, there have been a few exceptions. For example, The House of the Devil was released on VHS in 2010 as an Amazon-exclusive deal, in keeping with the film's intent to mimic 1980s horror films. The horror film V/H/S/2 was released as a combo in North America that included a VHS tape in addition to a Blu-ray and a DVD copy on September 24, 2013. In 2019, Paramount Pictures produced limited quantities of the 2018 film Bumblebee to give away as promotional contest prizes.
VHS also maintains a steady presence in media. For example, on the popular film review show On Cinema, Gregg Turkington plays a movie buff who has amassed the world's largest collection of VHS tapes. They are stored in the Victorville Film Archive, which was created solely to house Gregg's enormous and robust collection.
VCDThe Video CD was created in 1993, becoming an alternative medium for video, in a CD-sized disc. Though occasionally showing compression artifacts and color banding that are common discrepancies in digital media, the durability and longevity of a VCD depends on the production quality of the disc, and its handling. The data stored digitally on a VCD theoretically does not degrade. In the disc player, there is no physical contact made with either the data or label sides. When handled properly, a VCD will last a long time.
Since a VCD can hold only 74 minutes of video, a movie exceeding that mark has to be divided into two or more discs.
DVDThe DVD-Video format was introduced first on November 1, 1996, in Japan; to the United States on March 26, 1997 ; and mid-to-late 1998 in Europe and Australia.
Despite DVD's better quality, and the availability of standalone DVD recorders,
VHS is still used in home recording of video content. The commercial success of DVD recording and re-writing has been hindered by a number of factors including:
- A reputation for being temperamental and unreliable, as well as the risk of scratches and hairline cracks.
- Incompatibilities in playing discs recorded on a different manufacturer's machines to that of the original recording machine.
- Compression artifacts: MPEG-2 video compression can result in visible artifacts such as macroblocking, mosquito noise and ringing which become accentuated in extended recording modes. Standard VHS will not suffer from any of these problems, all of which are characteristic of certain digital video compression systems but VHS will result in reduced luminance and chroma resolution, which makes the picture look horizontally blurred. VHS also adds considerable noise to both the luminance and chroma channels.
High-capacity digital recording technologies
- Hard disk–based set-top boxes
- Hard disk/optical disc combination set-top boxes
- Personal computer–based media center
- Portable media players with TV-out capability
LegacyOften considered an important medium of film history, the influence of VHS on art and cinema was highlighted in a retrospective staged at the Museum of Arts and Design in 2013. In 2015, the Yale University Library collected nearly 3,000 horror and exploitation movies on VHS tapes, distributed from 1978 to 1985, calling them "the cultural id of an era."
The documentary film Rewind This!, directed by Josh Johnson, tracks the impact of VHS on film industry through various filmmakers and collectors.