Patent ID: 7505824
Filing Date: 2009-03-17
Classification: H03F,H03G

Abstract:
1. An audio signal processing apparatus, comprising: an interface unit configured to convert input audio signals to digital audio signals; a digital signal processor having a memory and a register, the digital signal processor being configured to process the digital audio signals converted by the interface unit; a volume unit configured to adjust a volume of the digital audio signals processed by the digital signal processor and generate at least one volume modulated signal; an amplifier having a gain value and performing operation of a power amplifier, the amplifier being configured to amplify the volume modulated signal generated by the volume unit and to output an amplified audio signal; a power supplier configured to supply a power to the amplifier; a level detector configured to detect a level of one of the digital audio signals converted by the interface unit or the processed digital audio signal and to generate a level signal; a calculation unit configured to calculate a power condition based on the level signal from the level detector and the at least one volume modulated signal from the volume unit, wherein a level of the power supplied by the power supplier to the amplifier is based on the calculated power condition; and a speaker to receive an amplified audio signal from the amplifier to output an audio signal, wherein the power amplification of the amplifier is based on the level signal, the volume modulated signal and the gain value of the amplifier.