Method and apparatus for controlling power supply of audio amplifier
AssigneeSamsung Electronics Co., Ltd.
InventorsHan-ki Kim, Hae-kwang Park
Life of this patent
Estimating the term…
Abstract
A method of controlling power supply voltage of an audio amplifier delays an input audio signal; estimates, with a digital signal processor, an audio output level of the delayed input audio signal based on correlations between the delayed input audio signal level and audio level change factors; sets a value of power supply voltage supplied to a power switching circuit unit in correspondence with the estimated audio output level prior to outputting the delayed input audio signal on which the estimated audio output level is based; and amplifies the delayed audio input signal to provide an audio output signal by variably controlling the power supply voltage supplied to the power switching circuit unit according to the set value of power supply voltage.
Claims15
A method of controlling power supply voltage of an audio amplifier, the method comprising:
- estimating, with a digital signal processor, an audio output level of an input audio signal based on correlations between an input audio signal level and audio level change factors;
- setting a value of power supply voltage supplied to a power switching circuit unit in correspondence with the estimated audio output level;
- variably controlling the power supply voltage supplied to the power switching circuit unit according to the set value of power supply voltage;
- and
- associating audio volume with the power supply voltage which is changed in accordance with the estimated audio output level to maintain a magnitude of an audio output signal with respect to a change in the power supply voltage.
An apparatus for controlling power supply of an audio amplifier, the apparatus comprising:
- a digital signal processor which estimates an audio output level of an input audio signal based on correlations between an input audio signal level and an analyzed audio level change factors, and sets a power control value corresponding to the estimated audio output level;
- a variable power supply unit which supplies a power supply voltage that is changed according to the power control value corresponding to the estimated output level set by the digital signal processor;
- and
- a power switching circuit unit which amplifies a pulse width modulation signal according to the variable power supply voltage supplied by the variable power supply unit,
- wherein audio volume is associated with the power supply voltage that is changed according to the power control value corresponding to the estimated output level to control a change of the audio output level with respect to a change in the power supply voltage.
Dependencies are inferred from the claim text.