H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/73
H04B 1/26 (2006.01) H04H 5/00 (2006.01)
Patent
CA 1154096
ABSTRACT OF THE DISCLOSURE A superheterodyne type multiplex signal receiver for multiplex signal transmission systems for receiving two in- dependent signals transmitted by amplitude modulation and angle modulation of single carriers, and for detecting an intermediate frequency by an intermediate frequency detector when changing the local oscillating frequency by a dial op- eration to select the received signal. The receiver has a switching circuit so composed that it operates a demodulation circuit which demodulates, from the modulated carrier, the two independent signals, which are then transmitted to two independent audio amplifiers provided at a later stage of an intermediate frequency amplifier for driving two speakers for reception of the multiplex signal, when the intermediate fre- quency is extremely close to a normally determined frequency. The switching circuit also transmits to the two independent audio amplifiers the demodulated signals obtained from an envelope detection circuit when the intermediate frequency is remote from the normally determined frequency.
349808
Fetherstonhaugh & Co.
Matsushita Electric Industrial Co. Ltd.
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