Supply voltage responsive audible transient (POP) suppression ar

Details Supply voltage responsive audible transient (POP) suppression ar Supply voltage responsive audible transient (POP) suppression ar

1991-05-21

1993-03-30

Ng, Jin F.

Electrical audio signal processing systems and devices

Noise or distortion suppression

Interpolation

381120, 381 28, 330297, 330 51, H04B 1500

Patent

active

051990792

ABSTRACT:
An audio signal processing channel includes a bias network for deriving a bias voltage which is coupled to a point within the channel from the supply voltage. In order to inhibit audible transients or "pops" due to the rapid reduction of the bias voltage when the voltage supply is deenergized, a diode is coupled between the bias network and the voltage supply so as to selectively decouple a filter capacitor of the bias network from the voltage supply and associated loads when the voltage supply is deenergized. As a result, the bias voltage is gradually reduced at a controlled rate of change which is independent of the impedances of voltage supply and associated loads. Such a "pop" suppression arrangement is particularly desirable when it is not possible or practical to "mute" the output amplifier of the channel.

REFERENCES:
patent: 3889202 (1975-06-01), Suzuki
patent: 3920931 (1975-11-01), Yanick, Jr.
patent: 3992677 (1976-11-01), Tsurushima
patent: 4315221 (1982-02-01), Numata et al.
patent: 4405948 (1983-09-01), Griffis
patent: 4600947 (1986-07-01), Chamberlain et al.
patent: 4788508 (1988-11-01), Kawai
RCA/GE Color Television Basic Service Data CTC 169(DV), published by Thomson Consumer Electronics, Inc., Indianapolis, Indiana in 1990, p. 2-G-1.

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