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Ultra-low time delay audio processing method and system based on spectrum analysis

An ultra-low-latency, audio processing technology, applied in speech analysis, instruments, etc., can solve the problems of limiting the improvement of frequency resolution and affecting the real-time performance and accuracy of real-time audio systems, so as to reduce delay and group delay , the effect of improving performance

Inactive Publication Date: 2016-09-07
欧仕达听力科技(厦门)有限公司
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Problems solved by technology

[0024] All in all, the system group delay affects the real-time performance and accuracy of real-time audio systems such as hearing aids, and also limits the improvement of frequency resolution, and how to provide a method for reducing the group delay of real-time audio systems has become a challenge for those skilled in the art. urgent problem

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  • Ultra-low time delay audio processing method and system based on spectrum analysis
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  • Ultra-low time delay audio processing method and system based on spectrum analysis

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Embodiment Construction

[0079] The present invention will be further described in conjunction with the accompanying drawings and specific embodiments.

[0080] As a specific embodiment, the present invention adopts the Wide Dynamic Range Compression (WDRC) method based on the ultra-low delay FIR synthesis filter, such as Figure 6 As shown, it mainly includes the following steps:

[0081] Step 1, input buffer update and short-time-frequency domain transformation: that is, perform frame division and short-time-frequency domain transformation on the input time-domain audio signal;

[0082] Step 2, frequency domain signal processing: analyze and process the audio signal after the short-term frequency domain transformation through the frequency domain function function, and obtain the gain of each time-frequency unit; specifically include channel division and channel energy estimation, smoothing, channel Compression gain calculation, sub-band gain calculation;

[0083] Step 3, gain smoothing: optimizin...

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Abstract

The invention relates to the field of audio signal processing, and relates to an ultra-low time delay audio processing method and a system based on spectrum analysis. The method comprises the steps: step1, framing and short time frequency domain transformation are performed on an inputted time domain audio signal; step2, analysis and process are performed on the transformed audio signal through a frequency domain function, and gain of each time frequency unit is obtained; step3, the gain of each time frequency unit is optimized; step4, the optimized gain serves as a frequency response characteristic of an FIR filter for synthesizing linear phase, and FIR filter coefficients are calculated and obtained through a frequency sampling design method; step5, the FIR filter coefficients acts on the FIR filter, and the time domain audio signal in the step 1 is directly filtered by the FIR filter to obtain an expected outputted audio signal. The system comprises a short time frequency domain transformation module, a signal processing module, a smooth filtering module, a filter coefficient calculating module and a filter application module. The method and the system can reduce the group delay of real-time signal processing.

Description

technical field [0001] The invention relates to the field of audio signal processing, and in particular provides an ultra-low time-delay spectrum analysis method and a processing system for the real-time sound signal processing function of a digital hearing aid. Background technique [0002] Currently in the field of speech / audio signal processing, signal processing based on spectrum analysis is a very common practice. For example, the most common technologies such as equalizer, noise reduction, spectrum shifting, and feedback signal elimination are all completed on the basis of spectrum analysis. In order to accurately analyze the signal characteristics in frequency domain, we need higher spectral resolution, but higher spectral resolution will bring higher signal group delay. [0003] Group delay is critical in audio devices such as telephones, cell phones, headsets, hearing aids, and cochlear implants, and introducing additional signal path delays can have a significant ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/0224G10L21/0232G10L25/45
CPCG10L21/0224G10L21/0232G10L25/45
Inventor 梁维谦马桂林薛行栋朴志刚
Owner 欧仕达听力科技(厦门)有限公司
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