[BC] CD vs LP

[Thomas G. Osenkowsky]

What it did was reverse the polarity of the peaks.
Highly asymmetrical waveforms such as voice
had their positive peaks inverted to negative peaks.
Some voices are highly asymmetrical and would
otherwise saturate the tape, or make the recording
more noisy if the overall level were decreased to
accommodate the positive peaks.

This avoided tape saturation by virtue of the fact
that you cannot exceed 100% negative modulation.
Since the tape bias is amplitude modulated, reverse
duplication actually produced a better sound without
the need for audio processing.

Tom Osenkowsky, CPBE
off his meds again :-)

> Some syndicators used to claim that duplicating tape backwards 
> improved quality because it reversed the waveform so you didn't have 
> to worry about high energy peaks.