ie., Signals, plural from 737

then this from 108:

'' In another aspect of the invention, noise reduction is advantageously provided when recording voice data. Through companding of the voice signal data, non-linear signal conditioning provides better sound resolution than is otherwise possible with a standard A/D conversion techniques. The noise cancellation is eliminated when recording music which would otherwise compromise true sound recording and playback.''

and

''The audio processing circuitry 22 and 25 includes circuitry that conditions the analog signal for both recording and playback. It feeds the signal through a differential amplifier. This boosts the signal and also removes common mode noise to produce a quieter signal.

Following this conditioning, the signal is processed through an automatic gain control circuit (AGC) where the recording level is automatically adjusted to a favorable level.''

emit...