Audio processing device and associated audio processing method

Patent metadata

Field	Value
Publication number	US-11545168-B2
Application number	US-202117232165-A
Country	US
Kind code	B2
Filing date	Apr 16, 2021
Priority date	May 18, 2020
Publication date	Jan 3, 2023
Grant date	Jan 3, 2023

Abstract

An audio processing device is disclosed. The audio processing device includes a filter and an output circuit. The filter is configured to receive an audio signal to generate a filtered audio signal, wherein the filter includes a plurality of parameters that are adjustable for changing a bandwidth, a center frequency or a gain of response of the filter. The output circuit is configured to receive the filtered audio signal to generate an output audio signal to a speaker. When the parameters of the filter are changed, the filter reduces changes in the audio signal caused by the parameters, and the output circuit continuously receives the filtered audio signal to generate the output audio signal for the speaker to play without interruption.

First claim

What is claimed is:

1. An audio processing device, comprising:
a filter, configured to receive an audio signal to generate a filtered audio signal, wherein transfer function of the filter is H(z)=1+H0*(1−A(z)), H0 is an adjustable gain value, A(z) is a multi-order function controlled by a plurality of parameters, and z is a frequency parameter; and
an output circuit, coupled to the filter, configured to receive the filtered audio signal to generate an output audio signal to a speaker;
wherein when the transfer function of the filter is changed, the filter reduces the adjustable gain value before the parameters are changed, and the output circuit continuously receives the filtered audio signal to generate the output audio signal for the speaker to play the output audio signal without interruption.

2. The audio processing device of claim 1 , wherein before the parameters are changed, the filter gradually reduces the adjustable gain value, to make the transfer function approach a value of one.

3. The audio processing device of claim 2 , wherein before the parameters are changed, the filter gradually reduces the adjustable gain value, to make the transfer function be equal to one.

4. The audio processing device of claim 2 , wherein during a period after the transfer function approaches one, the filter gradually increases the adjustable gain value to a target value.

5. An audio processing method, comprising:
utilizing a filter to receive an audio signal to generate a filtered audio signal, wherein a transfer function of the filter is H(z)=1+H0*(1−A(z)), H0 is an adjustable gain value, A(z) is a multi-order function controlled by a plurality of parameters, and z is a frequency parameter;
when the transfer function of the filter is changed, reducing the adjustable gain value before the parameters are changed; and
continuously receiving the filtered audio signal to generate an output audio signal, for a speaker to play the output audio signal without interruption during the process of changing the parameters.

6. The audio processing method of claim 5 , wherein when the transfer function is changed, the step of reducing the adjustable gain value before the parameters are changed comprises:
before the parameters are changed, gradually reducing the adjustable gain value, to make the transfer function approach a value of one.

7. The audio processing method of claim 6 , wherein when the transfer function is changed, the step of reducing the adjustable gain value before the parameters are changed comprises:
before the parameters are changed, gradually reducing the adjustable gain value, to make the transfer function be equal to one.

8. The audio processing method of claim 6 , further comprising:
during a period after the transfer function approaches one, gradually increasing the adjustable gain value to a target value.

Assignees

• Realtek Semiconductor Corp

Inventors

• Wu Chia-Che

Classifications

• H04S7/307

  Frequency adjustment, e.g. tone control (H04S7/301 takes precedence) · CPC title

• H04R3/04

  for correcting frequency response · CPC title

• H03G5/02

  Manually-operated control · CPC title

• G10L19/008

  Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing · CPC title

• H03G5/005

  of digital signals · CPC title