Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo
Patent
1983-09-06
1985-09-03
Isen, Forester W.
Electrical audio signal processing systems and devices
Binaural and stereophonic
Broadcast or multiplex stereo
329126, 455214, H04H 500
Patent
active
045396973
ABSTRACT:
An FM stereo demodulating circuit comprising a pulse counter detector 1 for generating a pulse train signal including the frequency spectrum of the FM signal, DC biasing means for current biasing the detector output about a midpoint, a subcarrier signal generator 2 and current drivers 8, 10 for generating dual polarity biased subcarrier currents, first and second transistor pairs 3, 4, the emitters of each being connected to one of the current drivers, and the bases of the pairs being cross-connected to one of the biased detector outputs, at least one reference transistor pair whose emitters are connected to a current source 11 and whose collectors are connected to each of the biased detector outputs. The currents entering the cross-connected collectors of the first and second transistor pairs, when referenced against the currents into the emitters of the reference transistor pair, produce signals proportional to the right and left channels of the FM signal.
REFERENCES:
patent: 3617641 (1971-11-01), Fiet
patent: 3721766 (1973-03-01), Hilbert
patent: 4049918 (1977-09-01), Ohsawa
patent: 4074075 (1978-02-01), Ohsawa
patent: 4140878 (1979-02-01), Ohsawa
patent: 4274057 (1981-06-01), Ishida et al.
patent: 4356350 (1982-10-01), Ienaka
patent: 4390746 (1983-06-01), Higashiyama et al.
Ishida Kohji
Numata Tatsuo
Sakamoto Masaharu
Isen Forester W.
Pioneer Electronic Corporation
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