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Audio Considerations for Stereophonic Broadcasting

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The advent of stereophonic broadcasting via FM multiplex has created a need for a new look into audio design requirements. In order that stereophonic sound be properly reproduced in its original perspective, it is essential that the phase and intensity (amplitude) relationships present at the recording microphones be transmitted to the listener in the same relative proportion. Broadcast equipment designed for monophonic use today has not been developed with this requirement in mind. Amplitude and phase differences may occur through patch systems, audio consoles, telephone lines, program amplifiers and transmitting equipment. Phase and amplitude errors which occur before the matrix will alter the original perspective of the stereo signal. Errors which occur following the matrix will have a detrimental effect upon the separation between channels. These relationships also place an effect upon the monophonic listener in the quality of sound, which may result from cancellation effects.

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