US 12,148,440 B2
Audio processing circuit whose output stage has different configuration based on signal strength
Tsung-Peng Chuang, HsinChu (TW)
Assigned to Realtek Semiconductor Corp., HsinChu (TW)
Filed by Realtek Semiconductor Corp., HsinChu (TW)
Filed on Nov. 23, 2021, as Appl. No. 17/534,398.
Claims priority of application No. 110114380 (TW), filed on Apr. 21, 2021.
Prior Publication US 2022/0343930 A1, Oct. 27, 2022
Int. Cl. G10L 21/0208 (2013.01); G10L 21/0216 (2013.01); H03F 3/217 (2006.01)
CPC G10L 21/0216 (2013.01) [H03F 3/2175 (2013.01); G10L 2021/02085 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An audio processing circuit, comprising:
a digital signal processing circuit, configured to process a digital audio signal to generate a processed signal;
a digital modulation circuit, configured to generate a modulated signal according to the processed signal;
an output stage, configured to generate an output audio signal according to the modulated signal;
a voltage regulator, configured to receive a supply voltage and suppress and attenuate power noise in the supply voltage to generate a regulated supply voltage; and
a signal detection circuit, configured to detect a signal strength of the digital audio signal and/or the processed signal to generate a first control signal to control the output stage to use the supply voltage or the regulated supply voltage to generate the output audio signal;
wherein when the signal detection circuit detects the signal strength of the digital audio signal and/or the processed signal, and the signal detection circuit determines that the digital audio signal and/or the processed signal is a small signal, the signal detection circuit generates the first control signal to control the output stage to use the regulated supply voltage, without using the supply voltage; and when the signal detection circuit determines that the digital audio signal and/or the processed signal is a large signal, the signal detection circuit generates the first control signal to control the output stage to use the supply voltage, without using the regulated supply voltage.