Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo
Patent
1986-12-10
1988-07-12
Isen, Forester W.
Electrical audio signal processing systems and devices
Binaural and stereophonic
Broadcast or multiplex stereo
H04H 500
Patent
active
047575395
ABSTRACT:
In an AM stereo receiving apparatus for decoding an AM stereo broadcasting signal of an ISB system, an envelope detecting circuit 6 detects an output of an intermediate frequency amplifying circuit 5 and a DC removing circuit 7 removes a DC component therefrom, so that a stereo sum signal (L+R) is obtained. A quadrature detecting circuit 9 detects quadrature of the output of the intermediate frequency amplifying circuit 5. A multiplying circuit 10 multiplies the stereo sum signal (L+R), which is amplified a times as much by a first amplifying circuit 8, and the output of the quadrature detecting circuit 9. An addition circuit 12 adds the output of the quadrature detecting circuit 9, which is amplified b times as much by a second amplifying circuit 11, and the output of the multiplying circuit 10. The output of the addition circuit 12 becomes a stereo difference signal (L-R) by appropriately setting the amplification factor a of the first amplifying circuit 8 and the amplification factor b of the second amplifying circuit 11.
REFERENCES:
patent: 4371747 (1983-02-01), Hilbert
patent: 4466116 (1984-08-01), Streeter
Arai Masashi
Tanaka Kanji
Isen Forester W.
Sanyo Electric Co,. Ltd.
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