Abstract
This chapter discusses servo systems and motor drive. Audio tape recorder has a single drive system to rotate the capstan, and this pulls the recording tape past the sound head at a constant, fixed speed. Provided this speed is the same during record and playback, the program will be correctly reproduced, and if the tape speed is arranged to conform to the standard, there is the further advantage of interchangeability between tapes recorded and played back on different machines. The only requirements, then, of a drive system in an audio tape recorder are that it should run at a specific speed, and that short-term speed variations (wow and flutter) are kept at a low-enough level to prevent noticeable changes of pitch in the reproduced sound. This simple drive system is possible because an audio waveform carries all the necessary information about the sound signal at any one instant, and this waveform is laid down along the tape as a single longitudinal stream of magnetic patterns. The situation with TV signals is rather different.
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