On-the-fly introduction of inter-channel delay in a...

Details On-the-fly introduction of inter-channel delay in a... On-the-fly introduction of inter-channel delay in a...

2004-11-12

2009-02-17

Shingleton, Michael B (Department: 2815)

Amplifiers

Modulator-demodulator-type amplifier

C381S071100, C381S094500

Reexamination Certificate

active

07492217

ABSTRACT:
A multiple-channel audio processor (10) and an associated plurality of power stages (22) in an audio system are disclosed. The audio processor (10) includes a plurality of audio amplifier channels (22), each of which includes a pulse-code-modulation (PCM) to pulse-width-modulation (PWM) conversion function (25), which generates PWM signals for application to the plurality of power stages (22). The audio amplifier channels (20) each also include an interchannel delay function (28) for delaying the PWM edges relative to other channels (20), for reducing noise. The audio amplifier channels (20) each also include delay adjust circuitry (32) for gradually increasing and decreasing the interchannel delay of the channel (20) on startup and shutdown. This permits a single control terminal (VALID) at the processor to globally enable and disable all of the power stages (22).

REFERENCES:
patent: 5982231 (1999-11-01), Nalbant
patent: 6373336 (2002-04-01), Anderskouv et al.
patent: 6720825 (2004-04-01), Hansen et al.
patent: 2002/0060605 (2002-05-01), Kowkutla et al.
patent: 2004/0017854 (2004-01-01), Hansen et al.

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