Electrical audio signal processing systems and devices – Including amplitude or volume control – Automatic
Reexamination Certificate
2003-08-06
2008-09-09
Chin, Vivian (Department: 2615)
Electrical audio signal processing systems and devices
Including amplitude or volume control
Automatic
C381S102000, C381S104000, C330S010000, C330S284000, C327S291000, C340S870030
Reexamination Certificate
active
07424120
ABSTRACT:
A method and apparatus for generating and controlling volume of a speaker of an appliance is disclosed. The appliance includes an IC chip connected to an amplifier subsystem. The IC chip includes a square-wave audio signal generator, a counter, a register, a comparator, and an AND gate. Theses components of the IC chip are used to generate modulated audio frequency square-wave signal. The modulated audio frequency square-wave signal having pulses, each pulse has a width determined by the volume control value. The modulated audio frequency square-wave signal is sent from the IC chip to the amplifier subsystem on a single connection. At the amplifier subsystem, the modulated audio frequency square-wave signal is integrated over, filtered, and amplified to drive a speaker to produce the desired sound. By adjusting the volume control value, the widths of the pulses, thus the volume of the produced sound can be controlled.
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Avago Technologies General IP Pte Ltd
Chin Vivian
Faulk Devona E
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