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From the s, magnetic tape video recording became a major contributor to the television industry, via the first commercialized video tape recorders VTRs. At that time, the devices were used only in expensive professional environments such as television studios and medical imaging fluoroscopy. In the s, 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 VCRs as having the power to disrupt their business, while television users viewed the VCR as the means to take control of their hobby.
In the s and early s, there was a format war in the home video industry. Two of the standards, VHS and Betamaxreceived the most media exposure. VHS eventually won the war, dominating 60 percent of the North American market by   and emerging as the dominant home video format throughout the tape media period. The earliest of these formats, LaserDiscwas not widely adopted. Kenjiro Takayanagia 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.
InJVC developed a two-head video tape recorder, and by a color version for professional broadcasting. In JVC collaborated with Sony Corporation and Matsushita Electric Matsushita was then parent company of Panasonic and is now known by that name, also majority stockholder of JVC until in building a video recording standard for the Japanese consumer.
U-matic was successful in business and some broadcast applications such as electronic news-gatheringbut 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 Betamaxwhile Matsushita started working on VX. Sony and Matsushita also produced U-matic systems of their own. In early the commercial video recording industry in Japan took a financial hit.
However, despite the lack of funding, Takano and Shiraishi continued to work on the project in secret. By the two engineers had produced a functional prototype. Inthe Japanese Ministry of International Trade and Industry MITIdesiring to avoid consumer confusionattempted to force the Japanese video industry to standardize on just one home video recording format.
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 standardwith the format shared among competitors without licensing the technology, Moorhead sex dates in Karlovac better for the consumer.
Matsushita also regarded Betamax's one-hour recording time limit as a disadvantage. However, the collaboration of JVC and its partners was much stronger, and eventually led the MITI to drop its push for an industry standard. Sony's Betamax competed with VHS throughout the late s and into the s see Videotape format war. Betamax's major advantages were its smaller cassette size, 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. 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. Additionally, VHS had a "far less complex tape transport mechanism" than Betamax, and VHS machines were faster at rewinding Moorhead sex dates in Karlovac fast-forwarding than their Sony counterparts.
It was also capable of recording four hours in LP long play mode. The flip-up cover that protects the tape Moorhead sex dates in Karlovac a built-in latch with a push-in toggle on the right side bottom view image.
The VHS cassette also includes an anti-despooling mechanism consisting of several plastic parts between the plastic spools, near the front of the tape white and black in the top view. The spool latches are released by a push-in lever within a 6.
There Emo girls that wanna hookup a clear tape leader at both ends of the tape to provide an optical auto-stop for the VCR transport mechanism. A light source is inserted into the cassette through the circular hole in the center of the underside when loaded in the VCR, and two photodiodes are located 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; in more sophisticated machines it will start rewinding the cassette when the trailing end is detected.
Early VCRs used an incandescent bulb as the light source, which regularly failed and caused the VCR to erroneously think that a cassette is loaded when empty, or would detect the blown bulb and stop Moorhead sex dates in Karlovac completely. Later designs use an infrared LED which had a much longer lifetime. The recording media is a The tape speed for "Standard Play" mode see below is 3. As 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 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 degrees of the head drum and also other tape transport components in a shape roughly approximating the letter M.
More frequently however, VHS tapes are thicker than the required minimum to avoid complications such as jams or tears in the tape. The slower speeds cause a very noticeable reduction in linear non-hifi audio track quality as well, as the linear tape speed becomes much lower than what is commonly considered a satisfactory minimum for audio recording. In order to avoid confusion, manufacturers indicate the playing time in minutes Moorhead sex dates in Karlovac can be expected for the Moorhead sex dates in Karlovac the tape is sold in.
As VHS was designed to facilitate recording from various sources, including television Moorhead sex dates in Karlovac 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 lossthis was regarded as a widespread problem, which the members of the Motion Picture Association of America MPAA 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 Macrovisionproduced by a company of the same name. According to Macrovision, "The technology is applied to over million videocassettes annually and is used by every MPAA movie studio on some or all of their videocassette releases.
Over commercial duplication facilities around the world are equipped to supply Macrovision videocassette copy protection to rights owners. Macrovision Moorhead sex dates in Karlovac protection saw refinement throughout its years, but has always worked by essentially introducing deliberate errors into a protected VHS Cam roulette only with women 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 intervalwhich 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 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 Moorhead sex dates in Karlovac protection has frustrated archivists who wish to copy now-fragile VHS tapes to a digital format for preservation. The erase head is fed by a high level, high frequency AC signal that overwrites any previous recording on the tape. The tape path then carries the tape Moorhead sex dates in Karlovac the spinning head drum, wrapping it around a little more than degrees called the omega transport system in a helical fashion, assisted by the slanted tape guides.
The head rotates constantly at approximately  rpm in NTSC machines, exactly in PAL, each complete rotation corresponding to one frame of video. Two tape heads are mounted on the cylindrical surface of the drum, 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. One tape head records Moorhead sex dates in Karlovac entire picture field. The original VHS specification had only two video heads. Later models implemented at least one more pair of heads, which were used at and optimized for the EP tape speed.
The high tape-to-head speed Moorhead sex dates in Karlovac by the rotating head results in a far higher bandwidth than could be practically achieved with a stationary head. The luminance black and white portion of the video is recorded as a frequency modulated Moorhead sex dates in Karlovac, with a down-converted " color under " chroma color signal recorded directly at the baseband.
Each helical track contains a single field 'even' or 'odd' field, equivalent to half a frame encoded as an Moorhead sex dates in Karlovac raster scansimilar to analog Women seeking sex partners in El Kharga broadcasts.
The horizontal resolution is lines per picture height, or about lines across a scan line, and the vertical resolution the number of scan lines is the same as the respective analog TV standard for PAL or for NTSC ; usually, somewhat fewer scan lines are actually visible due to overscan. 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 Moorhead sex dates in Karlovac 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 to analog equivalent to pixels from left-to-right, in digital terminology. S-VHS was designed for higher resolution, but failed to gain popularity outside Japan because of the high costs Moorhead sex dates in Karlovac the machines and tapes.
After 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. In 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. Audio 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 as well as generate a control track while the audio is being recorded. Some early VCRs would record audio without a control track signal, but this was of little practical use since the absence of a control track signal meant that the linear tape speed was irregular during playback.
More expensive decks offered stereo audio recording and playback. Linear stereo, as it was called, fit two independent channels in the same space Moorhead sex dates in Karlovac the original mono audiotrack. While this approach preserved acceptable backward compatibility with monoaural audio heads, the splitting of the audio track degraded the signal's SNR to the point that audible tape hiss was objectionable at normal listening volume.
To counteract tape hiss, decks applied Dolby B noise Moorhead sex dates in Karlovac for recording and playback. Dolby B dynamically boosts the mid-frequency band of the audio program on the recorded medium, Moorhead sex dates in Karlovac its signal strength relative to the tape's background noise floor, then attenuates the mid-band during playback. Moorhead sex dates in Karlovac B is not a transparent process, and Dolby-encoded program material will exhibit an unnatural mid-range emphasis when played on non-Dolby capable VCRs.
High-end consumer recorders took 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 without disturbing the otherwere 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 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. Another linear control trackat 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 known as " tracking ".
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