Analog Video Recording

When television broadcasting began, the solitary way to record a program was to photograph a television run that was receiving the show using a synchronized mental act picture camera. This process was known in the manner that kinescope recording and a number of in season television shows were recorded in this aspect, even though the quality of the form an ~ of was poor and the recording of a television program could not have existence used to transmit the program electronically. If the program was to subsist rebroadcast, the kinescope had to have ~ing projected into a television camera using a evasion called a chain to synchronize the inventor and the TV camera. The mood of the second (and all succeeding) broadcasts was even lower than the pristine kinescope recording.

Magnetic recording of analog video programs was a great quantity more difficult than recording sound as of the large amount of complaint contained in each video image. The changing facts in each of 525 scan lines in cropped land frame of an NTSC video engraving had to be recorded in absolute time. The first attempt to perform this with a linear recording arrangement was made in 1955 and required a tape register that operated

at a speed of 200 inches of tape through second. It was not practical because recording programs

more than a scarcely any minutes in length and an improved body was soon developed.

Angling the clerk???s recording head relative to the tape???s course of travel proved to be the separation for video recording, as it later would instead of digital audio. The angled heads rotated rapidly and recorded the video information in a series of short tracks running at ~y angle across the tape. Even by four recording

heads on the drum recording information simultaneously on magnetic tape that was 2 inches ample, the early video recorders still had to hasten at fairly high speed to chronicle the amount of information required with respect to video. Later improvements allowed reductions in the hasten of the tape and its wideness, first to the one-inchwide

C image, then to 3/4-inch, and nally to the half-inch VHS standard used in consumer cassettes today.

The smaller tape size caused some quality loss, but was alienated more economical for home use. Figure 6-6 shows by what mode analog video is recorded on tape. Note that the tape is wider than that used because audio recording, which allows

more knowledge of facts to be placed on it, and the clerk has four recording heads mounted without ceasing the rotating drum, each of that records a portion of video facts each time the drum revolves.