Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1980-04-09
1982-11-30
Masinick, Michael A.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329110, H04H 500
Patent
active
043617280
ABSTRACT:
A superheterodyne type multiplex signal receiver for multiplex signal transmission systems for receiving two independent 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 operation 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 frequency 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.
REFERENCES:
E. F. Close et al; "A Proposed Am-Am Compatible AM Stereo System", Magnavox Consumer Electronic Co., IEEE Trans on Consumers Electronics, vol. Ce-23, No. 3, 8-77.
Coles Sr. Edward L.
Masinick Michael A.
Matsushita Electric - Industrial Co., Ltd.
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