In stereophonic broadcasting, as in monophonic broadcasting, it is desirable to use compression of the peaks to prevent spurious responses and distortion in the detected signal. In stereo, however, a choice must be made between compression of the left (L) and the right (R) audio signals, or compression of L+R and L-R signals which may be derived from the original L and R signals. The latter choice has the advantage of permitting a higher mean level of modulation, but to a degree which depends upon program content. Using typical stereophonic program material, a study has been undertaken to determine mean signal levels and subjective differences in sound quality for the two methods.
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