Audio amplifier apparatus

Abstract

An audio amplifier apparatus for driving a loudspeaker is provided. The audio amplifier apparatus includes a soft charge unit, a first amplification module, and a second amplification module. The soft charge unit is coupled to the loudspeaker through an output terminal and supplies a driving current according to a first control signal to soft charge the loudspeaker, so as to gradually increase a voltage level on the output terminal. The first amplification module receives an audio signal according to the first control signal and amplifies the audio signal to output a first amplified signal for driving the loudspeaker. The second amplification module receives the audio signal according to a second control signal and amplifies the audio signal to output a second amplified signal for driving the loudspeaker. The soft charge unit generates the second control signal by comparing the voltage level on the output terminal with a predetermined voltage level.

Description

technical field [0001] The present invention relates to an amplifying device, and more particularly to an audio amplifying device capable of suppressing pop noise. Background technique [0002] Generally, when an electronic product is turned on and off, its speaker often emits popping noise, which makes the user feel uncomfortable. The reason is generally that the output terminal voltage of the audio amplification device for driving the speaker changes suddenly and sharply, thereby generating a spike current and causing the speaker to produce sharp and piercing noises. In addition to causing discomfort to the user, sometimes the excessive surge current will damage the highly sensitive components in the speaker, so many audio amplifiers take how to eliminate popping noise as the main design goal. [0003] In the existing practice, an additional pre-charging circuit is generally used to pre-charge the output terminal of the audio amplifier device, so that the voltage value on...

AI Technical Summary

Problems solved by technology

However, the sudden turn-on of the audio amplification device will also cause a certain degree of popping noise when the speaker is switched to normal operation after the end of pre-charging

In addition, the action of pre-charging will also affect the boot speed of the audio amplifier device, and cannot effectively improve the quality of the audio amplifier device.

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