Drive circuit, device, and method for suppressing noise, and...

Details Drive circuit, device, and method for suppressing noise, and... Drive circuit, device, and method for suppressing noise, and...

2007-10-09

2007-10-09

Nguyen, Khanh Van (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S20700P

Reexamination Certificate

active

10630108

ABSTRACT:
A low-frequency PWM-modulated signal and a high-frequency, unmodulated signal for generating a high-frequency PWM-modulated signal is employed directly for driving an output stage of a device for noise suppression. The low-frequency signal and the high-frequency signal is advantageously provided by a microcontroller which already has an AD converter on the input side. The microcontroller furthermore already makes a PWM output signal with a high bit width available which has the high resolution necessary for driving the loudspeaker.

REFERENCES:
patent: 5617058 (1997-04-01), Adrian et al.
patent: 5903819 (1999-05-01), Romesburg
patent: 6356151 (2002-03-01), Nalbant
patent: 0 878 001 (1996-11-01), None
patent: 1293647 (2003-05-01), None

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