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Frequency band extension method and device based on linear filtering and conference terminal system

A technology of frequency band extension and linear filtering, applied in speech analysis, instruments, etc., can solve the problems of high computing overhead, weak computing power, small memory, etc., and achieve the effect of improving voice quality and reducing computing overhead

Pending Publication Date: 2021-01-08
XIAMEN YEALINK NETWORK TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Embodiments of the present invention provide a linear filtering-based frequency band extension method, device, and conference terminal system to solve the problem that the existing deep learning model has a large scale of parameters and a large calculation cost, so that the frequency band extension method based on it cannot be applied when the time delay is low. , the technical problem of terminal systems with small memory and weak computing power can reduce computing overhead and occupy memory, and compared with traditional frequency band extension methods, it can effectively improve voice quality and is suitable for various codec scenarios

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  • Frequency band extension method and device based on linear filtering and conference terminal system
  • Frequency band extension method and device based on linear filtering and conference terminal system
  • Frequency band extension method and device based on linear filtering and conference terminal system

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Embodiment 1

[0063] see figure 1 , an embodiment of the present invention provides a linear filtering-based frequency band extension method, including steps S1-S8:

[0064] S1. Perform up-sampling processing on the sample narrowband speech signal to obtain a sampled time-domain speech signal.

[0065] S2. Extracting LPC coefficients and LPC residuals of the time-domain speech signal.

[0066] It should be noted that the LPC residuals are calculated during the process of extracting LPC coefficients. Linear Prediction (LPC) analysis is one of the most effective speech analysis techniques, which can accurately estimate basic speech parameters (pitch, formant, power spectrum, Vocal tract area function and transmission and storage of speech at a low rate), and the calculation speed is fast. Preferably, the method for extracting LPC coefficients mainly includes,

[0067] 01: P-order difference equation. From the time domain point of view, the LPC coefficient extraction actually solves the P-...

Embodiment 2

[0127] see figure 2 , an embodiment of the present invention provides a linear filter-based frequency band extension device, including:

[0128] An upsampling unit 200, configured to perform upsampling processing on the sample narrowband speech signal to obtain a sampled time domain speech signal;

[0129] The LPC parameter extracting unit 201 is used to extract the LPC coefficient and the LPC residual of the time-domain speech signal;

[0130] A residual speech signal acquisition unit 202, configured to use the LPC coefficients to perform first-order FIR filter filtering on the speech signal to be spread to obtain a residual speech signal;

[0131] an impulse response signal acquisition unit 203, configured to determine an impulse response signal according to the LPC residual and the LPC coefficient;

[0132] A broadband excitation signal generating unit 204, configured to generate a broadband excitation signal using the residual speech signal;

[0133] A Fourier transfor...

Embodiment 3

[0150] An embodiment of the present invention provides a conference terminal system, including:

[0151] A sound signal collector, a signal converter, a processing device, a transmission module and a terminal; wherein, the sound signal collector is connected to the signal converter, the signal converter is connected to the processing device, and the processing device is connected to the The transmission module is connected, the processing device includes a memory, a processor, and a frequency band extension program based on linear filtering that is stored on the memory and can run on the processor, and the frequency band extension program based on linear filtering is controlled by When the processor executes, the steps of implementing the linear filtering-based frequency band extension method described in Embodiment 1; the terminal is used to receive the signal after the frequency band extension.

[0152] It should be noted that all the technical content and technical effects ...

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Abstract

The embodiment of the invention discloses a frequency band extension method and device based on linear filtering and a conference terminal system. The method comprises the steps of carrying out up-sampling on a sample narrow-band voice signal, and obtaining a sampled time-domain voice signal; extracting an LPC coefficient and an LPC residual error of the time domain voice signal; performing first-order FIR filter filtering on a voice signal to be subjected to spectrum spreading by using the LPC coefficient to obtain a residual voice signal; determining an impulse response signal according to the LPC residual error and the LPC coefficient; generating a broadband excitation signal by using the residual voice signal; performing Fourier transform on the pulse response signal to obtain a Fourier transform result; and multiplying the broadband excitation signal by the Fourier transform result, and performing inverse Fourier transform on the multiplication result to obtain a broadband signalafter frequency band expansion. According to the embodiment of the invention, the calculation overhead and the occupied memory can be reduced, the voice quality can be improved compared with the traditional frequency band extension method, and the method is suitable for various coding and decoding scenes.

Description

technical field [0001] The present invention relates to the technical field of audio signal processing, in particular to a linear filter-based frequency band extension method, device and conference terminal system. Background technique [0002] The middle and high frequency components of the speech signal contain rich acoustic information, which directly affects the timbre, naturalness, clear reading, and intelligibility of the speech signal. The lack of voice signals in the middle and high frequency bands will seriously degrade the voice quality, for example, it will make the voice deep and reduce the expressiveness of the original natural voice signal. [0003] In the current public switched telephone network (Public Switched Telephone Networks) and some wireless communication systems, due to the influence of various factors such as channel bandwidth and coding method, voice signals can only retain low frequencies (0.3kHz-3.4kHz) during communication. ) part of the transm...

Claims

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Application Information

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IPC IPC(8): G10L19/04G10L19/26
CPCG10L19/04G10L19/26
Inventor 方泽煌康元勋
Owner XIAMEN YEALINK NETWORK TECH
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