AM stereo detection and audio processing apparatus

Details AM stereo detection and audio processing apparatus AM stereo detection and audio processing apparatus

1992-10-01

1994-08-23

Kuntz, Curtis

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

455266, 455265, 329306, 329360, 331DIG2, H04H 500

Patent

active

053414314

ABSTRACT:
A synchronous AM detector and processor requiring a reduced number of external components and fewer integrated circuit pins comprises an audio processor having a first filter operation controlled by a control voltage and an AM stereo decoder including a lock detector and a phase locked loop having a second filter operation controlled by the control voltage. A single control node is coupled to the audio processor and the phase locked loop, the control node providing the control voltage for the audio processor and the phase locked loop. The voltage at the control node is biased normally high, capable of being pulled low by the audio processing circuit and capable of being pulled low by the lock detector. An RC circuit decays the rise time of the control voltage at the control node after the control voltage has been pulled low. Circuitry is added to control the first filter operation of the audio processing circuitry responsive to the control voltage at the control node. Additional circuitry is added to control the second filter operation of the phase locked loop in response to the control voltage level.

REFERENCES:
patent: 3525945 (1970-08-01), Puente
patent: 4205272 (1980-05-01), Kumagai
patent: 4377728 (1983-03-01), Hilbert
patent: 4525686 (1985-06-01), Yokoya
patent: 5014316 (1991-05-01), Marrah et al.

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