PWM power amplifier and method for controlling the same

Details PWM power amplifier and method for controlling the same PWM power amplifier and method for controlling the same

2007-10-02

2007-10-02

Pascal, Robert (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

Reexamination Certificate

active

11260405

ABSTRACT:
The present invention provides a PWM power amplifier and a method for controlling the same which can improve the sound quality significantly in real time. There is provided a PWM power amplifier and a method for controlling the same that PWM-power-amplifies an input audio signal to supply thus amplified audio signal to a speaker, which power-amplifies the audio signal, removes high frequency signal components included in the audio signal which is power-amplified, detects a distortion error raised in the audio signal which has its high frequency signal components removed based on the audio signal just about to be power-amplified, adjusts a voltage supplied from an external power source depending on a detected distortion error, and adjusts a voltage to be supplied at the time of the power amplification by a value corresponding to the distortion error so as to reduce the output impedance of the audio signal which has its high frequency signal components removed.

REFERENCES:
patent: 6552606 (2003-04-01), Veltman et al.
patent: 2006/0181346 (2006-08-01), Nguyen

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