A digital audio 3D and audio mixing effect device with a self-adaptive sampling rate and an implementation method thereof
A technology of digital audio and its implementation method, which is applied in the direction of transducer circuits, sensors, electrical components, etc., and can solve problems such as weakening effects and differences in mixing effects
Inactive Publication Date: 2019-05-03
深圳市基准半导体有限公司
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Problems solved by technology
[0003] traditional digital audio 3D The processing circuit will bring crosstalk and phase distortion, making 3D The effect is greatly weakened; when the digital mixing circuit is mixing, the mixing effect will vary greatly due to different external environments
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[0042] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings;
[0043] refer to figure 1 , the present invention provides an adaptive sampling rate digital audio 3D and sound mixing effect device and its implementation method, which include: a frequency detection circuit (1); an equalization filter circuit (2); 3D filter circuit (3); mixing circuit (4); Sigma-Delta DA Conversion circuit (5); temperature compensated constant transconductance PWM Modulation circuit (6); self-adaptive dead zone control bootstrap drive circuit (7).
[0044] refer to figure 2 In the frequency detection circuit provided by the present invention, the external crystal oscillator provides the reference frequency, the frequency signal is segmented, and different frequency ranges are selected by means of successive approximation.
[0045] refer to image 3 , the equalization filter circuit provided by the present invention, ...
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The invention discloses a digital audio 3D and audio mixing effect device with a self-adaptive sampling rate and an implementation method thereof. A 3D and audio mixing effect control scheme of a chipmainly comprises a frequency detection circuit; An equalization filter circuit; A 3D filter circuit; An audio mixing circuit; a Sigma-Delta DA conversion circuit; a temperature compensation constanttransconductance PWM modulation circuit; and a self-adaptive dead zone control bootstrap drive circuit. The frequency detection circuit synchronizes all system clocks, the equalization filter circuitadjusts the frequency response of audio signals, the 3D filter circuit achieves the 3D sound effect through the optimal crosstalk elimination and phase delay, the audio mixing circuit enables different sound sources of different audio tracks to achieve sound source superposition according to different proportions and phase delays. The Sigma-Delta DA conversion circuit achieves filtering and noiseshaping of audio signals, the temperature compensation constant transconductance PWM modulation circuit modulates the audio signals into pulse width modulation signals in direct proportion to signal amplitudes, the self-adaptive dead zone control bootstrap drive circuit drives an H bridge, and power amplification of the audio signals is achieved.
Description
technical field [0001] The present invention relates to digital audio processing technology, in particular to a digital audio processing technology 3D And the power amplifier chip for mixing. Background technique [0002] In recent years, the continuous development of digital technology has made people have higher and higher requirements for audio quality. High sampling rate and sampling accuracy will obtain high sound quality, and the coefficients of digital filters need to be adjusted adaptively. to achieve 3D Sound effect, when the audio signal is transmitted through the speaker, the sound source of the left channel will be transmitted to both the left ear and the right ear; the sound source of the right channel will be transmitted to both the right ear and the left ear , resulting in a large crosstalk. [0003] traditional digital audio 3D The processing circuit will bring crosstalk and phase distortion, making 3D The effect is greatly weakened; when the digital mix...
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IPC IPC(8): H04R3/00
Inventor 田建平
Owner 深圳市基准半导体有限公司