Automatic power foldback for audio applications

Details Automatic power foldback for audio applications Automatic power foldback for audio applications

2003-09-26

2010-02-23

Chin, Vivian (Department: 2614)

Electrical audio signal processing systems and devices

With amplifier

C700S094000

Reexamination Certificate

active

07668321

ABSTRACT:
A power foldback circuit to automatically control the power of an audio amplifier by using the volume inputs to a pre-amp source which drives the audio amplifier. In an embodiment, a Universal Serial Bus (USB) on a personal computer is used to drive the audio speakers. In this circuit an audio digital to analog converter (DAC) with a USB interface receives a digitally encoded audio signal from a personal computer (PC). The USB DAC outputs an analog audio signal to a audio amplifier circuit. A supervisory circuit monitors the power used by the audio amplifier and through a volume control circuit lowers the volume control into the USB DAC to prevent the entire circuit from drawing more than the allowed power supplied by the USB connection to the PC.

REFERENCES:
patent: 5818948 (1998-10-01), Gulick
patent: 6216052 (2001-04-01), Gulick
patent: 6424875 (2002-07-01), Yoon
patent: 6573693 (2003-06-01), Okamoto
patent: 6970571 (2005-11-01), Knorr et al.
patent: 7171010 (2007-01-01), Martin et al.
patent: 2001/0003166 (2001-06-01), Gulick
patent: 2003/0059063 (2003-03-01), Inoue

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