Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1977-09-08
1979-02-13
Olms, Douglas W.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329 50, 330 85, H04R 500
Patent
active
041397380
ABSTRACT:
In a multiplex decoder circuit comprising two pairs of transistor differential circuits driven by switching signals of a 38 kHz subcarrier signal, for separating a stereo composite signal into left and right channel signals, a differential amplifier formed of a pair of transistors connected to the respective differential circuits for amplifying and injecting the composite signal, and a constant current source, at least one of the pair of differential transistor amplifiers being supplied with the composite signal is formed of a negative feedback amplifier to suppress the output distortion of the transistor amplifier due to variations in the emitter resistance of the transistor amplifier with respect to the variations of the input stereo composite signal. As a result, the waveform distortion of the separated left and right channel signals is reduced.
REFERENCES:
patent: 3546612 (1970-12-01), Day
patent: 3721766 (1973-03-01), Hilbert
patent: 3842211 (1974-10-01), Metro
patent: 3947645 (1976-03-01), Mizukami et al.
patent: 4054839 (1977-10-01), Ohsawa
Ienaka Masanori
Kominami Yasuo
Hitachi , Ltd.
Olms Douglas W.
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