Systems and methods for load detection and correction in a...

Details Systems and methods for load detection and correction in a... Systems and methods for load detection and correction in a...

2007-08-21

2007-08-21

Pascal, Robert (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S002000, C330S20700P

Reexamination Certificate

active

11211765

ABSTRACT:
Systems and methods for detecting the impedance of an output load coupled to a digital amplifier and compensating for changes in the response of the amplifier. One embodiment of the invention is implemented in a Class D pulse width modulated (PWM) amplifier. In this embodiment, a digital PCM test signal is generated. This test signal is processed by the amplifier to produce a corresponding analog audio output signal that is used to drive a speaker. A sense resistor placed in series with the speaker is used to generate a test voltage that is compared to a reference voltage. When the test voltage reaches the reference voltage, the current through the sense resistor (hence the speaker) is at a known level, so the value of the digital test signal is noted. The impedance of the speaker is then determined from the test signal value and the speaker current.

REFERENCES:
patent: 4554512 (1985-11-01), Aiello
patent: 5652542 (1997-07-01), Fink
patent: 5719526 (1998-02-01), Fink
patent: 6229389 (2001-05-01), Pullen et al.
patent: 6232833 (2001-05-01), Pullen
patent: 6294954 (2001-09-01), Melanson
patent: 6373334 (2002-04-01), Melanson
patent: 6737917 (2004-05-01), Ryoo et al.
patent: 6744310 (2004-06-01), Honda
patent: 7078964 (2006-07-01), Risbo et al.

Affiliated with

Also associated with

Rating

Systems and methods for load detection and correction in a... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Systems and methods for load detection and correction in a..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Systems and methods for load detection and correction in a... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3842109