AUDIO RECORD AND PLAYBACK
Except for the Video 8 system, the analogue video formats were originally designed for use with longitudinal sound tracks written onto and read off the tape by a stationary head assembly fitted between the head drum and the pressure roller. The techniques used are identical to those employed in audio tape recording, except that the tracks are much narrower (1 mm wide) and the linear speed of the tape is low, varying from 2.4 cm/s to 1.17 cm/s in various formats and modes. The narrow audio tracks are not capable of better S/N ratio than about 43 dB, or 50 dB with sophisticated noise-reduction systems. The low linear tape speed sets an upper frequency limit of about 10 kHz in normal modes and 6 kHz in LP modes. ...
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