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Consumer Electronics by S. P. Bali

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CHAPTER 22

STEREO MULTIPLEXING

An FM stereo signal consists of two different audio frequency signals that occupy the same f.m. signal. The individual audio signals are identified as “left” (L) and “right” (R). In conventional programming, this pair of audio signals originated from a pair of microphones at a sound studio. The audio signal from the L microphone differs from that of the R microphone. Therefore, the stereo signal consists of two audio waveforms that vary independently in frequency and amplitude.

In monophonic FM transmission, a swing of + 75 kHz represents cent per cent modulation and produces sidebands that occupy the entire channel.

If high fidelity were not required, an FM channel could be divided into two equal parts for transmission ...

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