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D-class audio power amplifier and audio signal processing method thereof

A technology for audio signal processing and audio power, applied in amplifiers, amplifiers with semiconductor devices/discharge tubes, electrical components, etc. Reduce saturation distortion and improve the effect of output sound quality

Active Publication Date: 2015-01-28
JIAXING HEROIC ELECTRONICS TECH
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Problems solved by technology

The frequency and the amplitude of the triangular wave output signal of the class D audio power amplifier in the prior art are fixed, and when the amplitude of the input audio signal is too large, the pulse width of the PWM signal generated by comparing the input audio signal with the triangular wave output signal will be It cannot accurately contain the amplitude information of the input audio signal, and at this time, saturation distortion will be generated on the restored audio signal

Method used

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  • D-class audio power amplifier and audio signal processing method thereof
  • D-class audio power amplifier and audio signal processing method thereof

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Embodiment Construction

[0020] Such as figure 2 As shown, according to a specific embodiment of the class D audio power amplifier of the present invention, the class D audio power amplifier includes a pre-amplification module 100, a triangle wave generator 300, an integrator 400, a feedback loop 700, a comparator 500 and a drive module 600.

[0021] The class D audio power amplifier further includes an amplitude detector 200 for detecting the voltage amplitude of the input audio signal 150 , and the amplitude detector 200 is controlled to detect the output signal 250 by the voltage amplitude of the input audio signal 150 . In this embodiment, the amplitude of the input voltage of the amplitude detector 200 is in the range of 0V˜1.5V.

[0022] The input terminal of the amplitude detector 200 is connected to the output terminal of the pre-amplification module 100 , and the input audio signal 150 is input through the input terminal of the amplitude detector 200 . The output terminal of the amplitude ...

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Abstract

The invention discloses a D-class audio power amplifier and an audio signal processing method thereof. The D-class audio power amplifier comprises a pre-amplification module, a triangular wave generator, an integrator, a feedback loop, a comparer, a driving module and an amplitude detector, wherein the amplitude detector is used for detecting an amplitude value of an input audio signal; and the amplitude value of an input voltage is in a range of 0 to 2 V. Because the amplitude detector is added, the D-class audio power amplifier reduces the saturation distortion of a restored audio signal. A pulse-width modulation (PWM) signal drives a loudspeaker by a power switch, and the loudspeaker restores the audio signal. Because the pulse width of the PWM signal accurately contains the amplitude information of the input audio signal, the D-class audio power amplifier also improves output tone quality.

Description

technical field [0001] The invention relates to the technical field of audio power amplification, in particular to a Class D audio power amplifier and an audio signal processing method thereof. Background technique [0002] Class D audio power amplifiers are more and more widely used in mobile phones, MP3 and other portable electronic products due to their advantages of high efficiency, low power consumption, and low heat generation. Its working principle is: the class D audio power amplifier compares the input audio signal with the carrier signal (triangular wave output signal) to generate a PWM (pulse width modulation) signal containing the input audio signal information, the PWM signal drives the speaker through the power switch, and The speaker reproduces the audio signal. Alternatively, the PWM signal can be output at the output terminal, and a filter is added at the rear end to restore the audio signal before driving the speaker. [0003] Such as figure 1 As shown, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/217
Inventor 沈世龙黄武康代军杨志飞赵玉月马琳张伟周长胜殷明
Owner JIAXING HEROIC ELECTRONICS TECH
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