Title: Apparatus and method to control audio volume in D class amplifier
Application Number: 200610128937 Application Date: 2006.09.04
Publication Number: 1929300 Publication Date: 2007.03.14
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H03G3/20;H03F3/217
Applicant(s) Name: Samsung Electronics Co., Ltd. Address:
Inventor(s) Name:
Attorney & Agent: hanmeng xing tanchang chi
Abstract:
    An apparatus and method to control audio volume through adjustment of a carrier level in a D class amplifier. The apparatus includes a control unit to generate a volume control signal, a PWM unit to adjust the level of a carrier signal according to the volume control signal generated by the control unit and to generate a pulse width modulation signal by comparing the adjusted carrier signal level with the level of an input audio signal, generating; and a power amplification unit to amplify the power of the pulse width modulation signal generated by the PWM unit.
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