Delta-sigma modulation apparatus and signal amplification apparatus

Patent 6795004 Issued on September 21, 2004. Estimated Expiration Date:

September 17, 2022. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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Inventors

Assignee

Sony Corporation

Application

No. 10416443 filed on 09/17/2002

US Classes:

341/143, Differential encoder and/or decoder (e.g., delta modulation, differential pulse code modulation)341/118, CONVERTER COMPENSATION341/120CONVERTER CALIBRATION OR TESTING

Examiners

Primary: Tokar, Michael
Assistant: Nguyen, Linh

Attorney, Agent or Firm

Maioli; Jay H.

International Class

H03M 300

Abstract

A signal amplifier apparatus adapted for carrying out delta-sigma modulation of an input signal to carry out pulse width modulation (PWM) of that signal, to obtain a PWM signal, and to amplify this PWM signal so that a signal of a predetermined magnitude is obtained, wherein the signal amplifier apparatus includes a correction circuit for correcting an output of a quantizer provided in a delta-sigma modulation device. The correction circuit is installed in a feedback path with respect to the input side from the quantizer or immediately before a pulse width modulator to thereby correct distortion taking place in the amplifier. In addition, the signal amplifier apparatus invention compares PWM signals at the input and the output of the amplifier to correct the output of the quantizer that is provided in the delta-sigma modulation device, so as to cancel distortion taking place in the amplifier in accordance with respective rising time difference and falling time difference to thereby correct distortion.