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Abstract

In the Zenith-G.E. stereophonic broadcasting system, a small proportion of the available modulation capacity is taken up by a pilot signal used in the demodulation process at the receiver. The remainder is divided between the sum of the left- and right-hand stereophonic signals, transmitted in the same way as a monophonic programme, and the difference between these signals, transmitted by modulation of a subcarrier. An investigation has been carried out to determine how far the level of the sum signal is lowered by the presence of the difference signal. Measurements made with an audio-frequency circuit designed to simulate the combination of the sum and difference signals in the transmitter yield a figure which, for the commonest types of programme, varies from 2 dB to 4 dB; in calculating the signal received by the monophonic listener, this figure must be added to the losses from other causes.

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