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A method for suppressing pop sound, audio output circuit and terminal

A technology of audio output and circuit, applied in the field of circuit

Active Publication Date: 2020-03-20
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It can be seen that the OUT node needs to gradually change from the initial 0 level to the common mode level of 1 / 2 power supply level. This change process can easily lead to POP sound. In view of this, this application provides a POP sound Suppression Scheme to Suppress POP Tones When Using AC-Coupled Output Structures

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  • A method for suppressing pop sound, audio output circuit and terminal
  • A method for suppressing pop sound, audio output circuit and terminal
  • A method for suppressing pop sound, audio output circuit and terminal

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Embodiment Construction

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0038] Depend on figure 1 It can be seen that when the audio output circuit adopts an AC coupling structure, since the AC coupling capacitor is separated between the OUT node and the load, the OUT node is a weak drive node close to 0 before the power supply is powered on; but in the final operation, the OUT node has Non-zero common-mode level, the actual signal of the OUT node is non-zero common-mode level plus audio AC signal.

[0039] It can be seen that the OUT node needs to gradually change from the initial 0 level to the common mode level, and this change process can easily lead to a POP sound.

[0040] In view of the above problems, the embodiment of the present application provides a POP sound suppression method, audio output circuit and terminal to suppress the POP ...

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PUM

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Abstract

The application discloses a method for suppressing POP sound, an audio output circuit and a terminal, so as to suppress the POP sound easily generated when the audio output circuit adopts an AC coupling structure. The output circuit includes: an output power amplifier, a common-mode level buffer, a reference level generating circuit, a power-on POP tone suppression switch and a common-mode switch, and the power-on POP tone suppression switch is used in the audio output circuit During the power-on process of the power supply, the level of the output node is controlled to be zero; the common mode switch is used to control the level of the output node when the reference level of the reference level generating circuit is zero, etc. Based on the reference level, the output circuit can avoid the POP sound generated by the common mode establishment process.

Description

technical field [0001] The present application relates to the field of circuits, in particular to a method for suppressing POP sounds, an audio output circuit and a terminal. Background technique [0002] Due to the physical particularity of the human brain, people are extremely sensitive to sudden changes in signal changes, so any non-ideal small changes that occur during the opening of the load path may be perceived by the human ear. It is expressed as a "pop" sound, so it is called pop sound. [0003] Existing audio data is divided into two types according to the output coupling type: alternating current (AC), coupling output and direct current (Direct Current, DC) output. in, figure 1 The schematic diagram of the output structure of AC coupling is shown. Since the AC coupling output adopts a single power supply, when zero signal is input, the output node (that is, the OUT node) is a non-zero level, generally 1 / 2 power supply level; therefore, it cannot be directly driv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R3/00
CPCH04R3/00H03F1/305H03F3/181H03F2200/03H03G3/348H04R3/007H04R2400/00Y02D30/70H03M1/66H04R3/02H04R5/033H04R5/04
Inventor 李定杜帅李君尹德杨
Owner HUAWEI TECH CO LTD