Huawei Technologies Co., Limited

Deyang Yin

Jun Li

Ding Li

Shuai Du

An example audio play circuit includes a power supply module, a power amplifier, a coupling capacitor, a load, and a plosive suppression circuit. An output terminal of the power amplifier is connected to a first terminal of the coupling capacitor and an output terminal of the plosive suppression circuit, a second terminal of the coupling capacitor is connected to the load, and an output terminal of the power supply module is connected to a power supply terminal of the power amplifier and a power supply terminal of the plosive suppression circuit. The power supply module is configured to provide a direct current power supply voltage for the power amplifier and the plosive suppression circuit. When the direct current power supply voltage rises to the first voltage threshold, the plosive suppression circuit connects the first terminal of the coupling capacitor to the ground terminal.

Audio play circuit and audio play device

An audio processing circuit includes a cascade operational amplifier circuit, an output node, and a pull-down circuit. The cascade operational amplifier circuit includes a first operational amplifier circuit and a second operational amplifier circuit. The first operational amplifier circuit includes a main operational amplifier and a secondary operational amplifier that are connected in parallel. The pull-down circuit is configured to pull down a voltage at the output node after the first operational amplifier circuit is turned on. The second operational amplifier circuit is configured to, after the secondary operational amplifier is turned on, control a voltage gain of the secondary operational amplifier to change gradually from low to high.

Audio processing circuit and terminal device

A pop sound suppression method, an audio output circuit, and a terminal suppress a pop sound that is generated when an audio output circuit is in an alternating current (AC) coupling structure. The output circuit includes an output power amplifier, a common-mode voltage buffer, a reference voltage generation circuit, a powered-on pop sound suppression switch, and a common-mode switch. The powered-on pop sound suppression switch is configured to control, in a power-on process of the audio output circuit, a voltage level of an output node to be zero. The common-mode switch is configured to control, when a reference voltage level of the reference voltage generation circuit is zero, the voltage level of the output node to be equal to the reference level.

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Deyang Yin