CN-121985258-A - Audio signal processing device and method, audio playing system and chip

CN121985258ACN 121985258 ACN121985258 ACN 121985258ACN-121985258-A

Abstract

The application provides an audio signal processing device and method, an audio playing system and chip, and relates to the technical field of audio playing. The audio signal processing device comprises an up-sampling module, a selection module and a power supply voltage control module, wherein the up-sampling module is used for up-sampling a received digital audio signal to be played and sending the obtained first digital audio signal to a first signal output end of an audio signal processing device, the first signal output end is used for being connected with an input end of a first DAC in an audio link of an audio playing system, the selection module is used for selecting the maximum value from the digital audio signal to be played and the first digital audio signal to obtain a second digital audio signal, and the power supply voltage control module is used for carrying out envelope tracking on the second digital audio signal and sending the obtained third digital audio signal to a second signal output end of the audio signal processing device, wherein the second signal output end is used for being connected with an input end of a second DAC in the power supply link of the audio playing system. The scheme of the application can solve the problem of clipping of the audio signal.

Inventors

YANG TAO
YUE ZHENBO
CHEN QUANXIU

Assignees

珠海楠欣半导体科技有限公司

Dates

Publication Date: 20260505
Application Date: 20260209

Claims (10)

1. An audio signal processing device is characterized by comprising an up-sampling module, a selection module and a power supply voltage control module; the up-sampling module is used for up-sampling the received digital audio signal to be played to obtain a first digital audio signal, and transmitting the first digital audio signal to a first signal output end of the audio signal processing device, wherein the first signal output end is used for being connected with an input end of a first digital-to-analog converter in an audio link of an audio playing system; The selecting module is used for selecting the maximum value from the digital audio signal to be played and the first digital audio signal to obtain a second digital audio signal; the power supply voltage control module is used for carrying out envelope tracking on the second digital audio signal to obtain a third digital audio signal, and sending the third digital audio signal to a second signal output end of the audio signal processing device, wherein the second signal output end is used for being connected with an input end of a second digital-to-analog converter in a power supply link of the audio playing system.
2. The audio signal processing apparatus according to claim 1, wherein the supply voltage control module includes a detection unit and an envelope tracking unit; the detection unit is used for detecting the second digital audio signal to obtain a detection signal; The envelope tracking unit is configured to perform envelope tracking on the detected signal to obtain the third digital audio signal, and send the third digital audio signal to a second signal output end of the audio signal processing device.
3. The audio signal processing apparatus of claim 1, further comprising a signal shaping module; the signal shaping module is configured to perform noise shaping on the first digital audio signal output by the upsampling module and send the first digital audio signal to a first signal output end of the audio signal processing device.
4. An audio signal processing device as claimed in claim 3, characterized in that the signal shaping module is a sigma-delta modulator.
5. The audio signal processing apparatus according to any one of claims 1 to 4, further comprising an integrated circuit built-in audio bus; The integrated circuit is internally provided with an audio bus and is used for receiving the digital audio signals to be played, which are input from the outside, and sending the digital audio signals to be played to the up-sampling module and the selection module respectively.
6. An audio playing system comprising an audio link, a power supply link and an audio signal processing device according to any one of claims 1 to 5, wherein the power supply link comprises a second digital-to-analog converter and a power supply module; The first signal output end of the audio signal processing device is connected with the input end of a first digital-to-analog converter in the audio link, the second signal output end of the audio signal processing device is connected with the input end of a second digital-to-analog converter, and the power supply end of the power supply link is connected with the power amplifier power supply end of the audio link; The power supply link is configured to convert the third digital audio signal output by the second signal output end of the audio signal processing device into a second analog signal through the second digital-to-analog converter, and control the power supply module to provide a power supply voltage for the audio link according to the second analog signal; The audio link is configured to convert a first digital audio signal output by a first signal output end of the audio signal processing device into a first analog signal through the first digital-to-analog converter, and drive a speaker connected with a power amplifier output end of the audio link to play the digital audio signal to be played, which is received by the audio signal processing device, according to the first analog signal and the power supply voltage.
7. An audio signal processing method, characterized in that it is applied to an audio signal processing apparatus as claimed in any one of claims 1to 5, or to an audio playback system as claimed in claim 6, comprising: Up-sampling a received digital audio signal to be played to obtain a first digital audio signal, and sending the first digital audio signal to a first signal output end of the audio signal processing device so as to play the digital audio signal to be played based on the first digital audio signal through an audio link connected with the first signal output end; selecting the maximum value from the digital audio signal to be played and the first digital audio signal to obtain a second digital audio signal; Envelope tracking is carried out on the second digital audio signal to obtain a third digital audio signal, and the third digital audio signal is sent to a second signal output end of the audio signal processing device so as to provide a supply voltage for the audio link based on the third digital audio signal through a supply link connected with the second signal output end.
8. The audio signal processing method according to claim 7, wherein up-sampling the received digital audio signal to be played to obtain a first digital audio signal, and transmitting the first digital audio signal to a first signal output terminal of the audio signal processing apparatus, comprises: Up-sampling the received digital audio signal to be played to obtain a first digital audio signal; And the first digital audio signal is sent to a first signal output end of the audio signal processing device after being subjected to noise shaping.
9. A chip comprising an audio signal processing device according to any one of claims 1 to 5 or comprising an audio playback system according to claim 6.
10. An electronic device comprising an audio signal processing apparatus as claimed in any one of claims 1 to 5, or comprising an audio playback system as claimed in claim 6, or comprising a chip as claimed in claim 9.

Description

Audio signal processing device and method, audio playing system and chip Technical Field The present application relates to the field of audio playing technologies, and in particular, to an audio signal processing apparatus and method, an audio playing system, and a chip. Background With the development of modern technology, audio playing technology plays an increasingly important role in home cinema, vehicle-mounted sound system, public broadcasting system, wireless audio equipment, multi-equipment collaboration and other scenes. Fig. 1 is a schematic diagram of an audio playing system in the related art, referring to fig. 1, after up-sampling, a digital audio signal to be played enters an audio link, after power amplification is performed by a power amplification module in the audio link, the obtained actual audio signal is output to a loudspeaker through an output end VOUT of the audio link to drive the loudspeaker to play the digital audio signal to be played, the digital audio signal to be played is processed by a power supply voltage control module and then enters a power supply link, a boost module in the power supply link is controlled to provide power supply voltage for a power amplification source end of the power amplification module in the audio link, namely, power supply voltage is provided for a power amplification source end of the power amplification module in the audio link through a power supply end PVDD. When the power supply voltage output by the power supply end PVDD changes along with the envelope change of the voltage output by the output end VOUT of the audio link, the ideal system efficiency can be achieved. However, when the frequency of the digital audio signal to be played is relatively high, for example, when the frequency of the digital audio signal to be played and the sampling frequency corresponding to the digital audio signal to be played are close to a coherent sampling relationship, the sampling point in a signal period may be relatively small, and the peak information of the audio signal is likely to be lost, so that the power supply voltage control module cannot detect the peak value of the signal when performing envelope tracking, and the power supply voltage output by the power supply end PVDD of the power supply link is smaller than the peak value of the actual audio signal, and the voltage output by the output end VOUT of the audio link can restore the actual peak value of the audio signal due to the up-sampling of the signal on the audio link. In this way, the power supply voltage output by the power supply end PVDD is less than the voltage output by the output end VOUT of the audio link, which results in clipping of the signal output by the output end VOUT of the audio link. Accordingly, there is a need to provide a solution to the problem of clipping of audio signals in an audio playback system. Disclosure of Invention The application provides an audio signal processing device and method, an audio playing system and a chip, which are used for solving the problem of clipping of an audio signal in the audio playing system in the prior art. In a first aspect, the present application provides an audio signal processing apparatus, including an upsampling module, a selecting module, and a supply voltage control module; the up-sampling module is used for up-sampling the received digital audio signal to be played to obtain a first digital audio signal, and transmitting the first digital audio signal to a first signal output end of the audio signal processing device, wherein the first signal output end is used for being connected with an input end of a first digital-to-analog converter in an audio link of an audio playing system; The selecting module is used for selecting the maximum value from the digital audio signal to be played and the first digital audio signal to obtain a second digital audio signal; the power supply voltage control module is used for carrying out envelope tracking on the second digital audio signal to obtain a third digital audio signal, and sending the third digital audio signal to a second signal output end of the audio signal processing device, wherein the second signal output end is used for being connected with an input end of a second digital-to-analog converter in a power supply link of the audio playing system. In an alternative design, the supply voltage control module includes a detection unit and an envelope tracking unit; the detection unit is used for detecting the second digital audio signal to obtain a detection signal; The envelope tracking unit is configured to perform envelope tracking on the detected signal to obtain the third digital audio signal, and send the third digital audio signal to a second signal output end of the audio signal processing device. In an alternative design, the audio signal processing device further comprises a signal shaping module; the signal shaping module is configured to perform noise shaping on the f