Blend-on-noise stereo decoder

Details Blend-on-noise stereo decoder Blend-on-noise stereo decoder

1989-12-22

1991-06-25

Ng, Jin F.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 13, H04H 500

Patent

active

050274023

ABSTRACT:
An FM stereo decoding and separating circuit has an (AM) demodulator multiplier to which is connected the FM stereo composite signal and a signal of dominant frequency equal to and in phase (0.degree.) with respect to the pilot signal for retrieving the L-R signal from the composite signal. This demodulator also has a blend control circuit for diminishing the magnitude of the L-R signal as a function of a blend control voltage that may be applied to the input of the blend control circuit. The decoding circuit also includes a special multiplier to which is connected the FM stereo composite signal and a signal of dominant frequency equal to that of the 38 KHz subcarrier but shifted 90.degree. with respect to the phase of the pilot, for AM demodulating the composite signal with respect to the subcarrier, and a low pass filter connected to the special mixer output for producing an output containing only demodulated noise originally appearing about the pilot in the composite signal, and a rectifier connected to the filter output and to the blend-control input for effecting blending to a degree directly related to the amount of noise in a narrow band about the pilot in the composite signal.

REFERENCES:
patent: 3602380 (1986-07-01), Stebbings
patent: 3603890 (1971-09-01), Camenzind
patent: 4037056 (1977-07-01), Ienaka et al.
patent: 4074075 (1978-02-01), Oshawa
patent: 4390749 (1983-06-01), Pearson
patent: 4466115 (1984-08-01), Hashimoto
patent: 4817151 (1989-03-01), Bod et al.
Takahashi and Iida, "Application of Walsh Functions to an FM Stereo Demodulator," J. Audio Eng. Soc., vol. 33, No. 9, Sep. 1985, pp. 669-673.

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