VHS and S-VHS use the same methods for sound recording and reproduction, so we'll start with them. There are two separate types of audio on a VHS tape - HiFi and Linear. The HiFi track is stereo, has a broad dynamic range and very low noise. In fact, when properly recorded, you would have a hard time distinguishing it from CD sound. HiFi audio is recorded (with a separate head) along with the video signal as the tape passes by the rotating video drum. Linear audio is recorded along the edge of the tape with a stationary head - just like a cassette deck.
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