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Band spreading method and apparatus

A frequency band expansion and low frequency band technology, applied in the field of frequency band expansion methods and devices, can solve the problems of linear prediction coefficient error, large difference in output signal performance, inaccurate wide-band linear prediction coefficient, etc., and achieve good quality performance and performance quality Good results

Active Publication Date: 2011-05-04
HONOR DEVICE CO LTD
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Problems solved by technology

[0004] In the process of realizing the present invention, the inventor found that there are at least the following problems in the prior art: the codebook used in the prior art converts linear prediction coefficients into line spectrum frequency parameters, Mel cepstral coefficients and other representations In the domain, according to the relationship between low-frequency and high-frequency broadband signals, a codebook with high-frequency and low-frequency mapping relationship is trained. This codebook has a great relationship with the language used in the training process; When the signal characteristics in the training set used to train the codebook are not very similar, there may be a large error between the broadband linear prediction coefficient obtained according to the codebook and the actual linear prediction coefficient, making the predicted broadband linear prediction coefficient Very inaccurate, so that the quality performance of the acquired wideband signal is not very good
Therefore, when the existing technology processes different languages ​​or languages, the performance of the output signal may vary greatly

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Embodiment 1

[0025] An embodiment of the present invention provides a frequency band extension method, such as figure 1 As shown, the method includes:

[0026] 101. Obtain the type of broadband signal.

[0027] The types of broadband signals are generally classified according to the characteristics of the signal itself, such as pitch period, zero-crossing rate, spectrum tilt and correlation, etc., and can be divided into large-period voiced signals, small-period voiced signals, unvoiced signals and fricatives Wait.

[0028] Among them, when expanding the narrow-band signal into a wide-band signal, since the linear prediction coefficients of different types of signals and the characteristics of the excitation signal are not the same, in order to expand the narrow-band linear prediction coefficients to wide-band linear prediction coefficients, the wide-band linear prediction The synthesis filter composed of coefficients can be kept stable, so for different types of signals, different white...

Embodiment 2

[0037] An embodiment of the present invention provides a frequency band extension method, such as figure 2 As shown, the method includes the following steps:

[0038] 201. Obtain the type of the broadband signal.

[0039] Among them, when extending the low-band signal to a high-band signal, since the linear prediction coefficients of different types of signals and the characteristics of the excitation signal are not the same, in order to expand the narrow-band linear prediction coefficients to wide-band linear prediction coefficients, the wide-band linear prediction coefficients The synthesis filter composed of prediction coefficients can keep stable, so, for different types of signals, when solving the linear prediction coefficients, different white noise correction factors are used for the corresponding autocorrelation coefficients. However, it is generally impossible to directly predict the type of the above-mentioned broadband signal at the receiving end, and it can be obt...

Embodiment 3

[0074] An embodiment of the present invention provides a frequency band extension device, such as image 3 As shown, the device includes: a type acquisition unit 31 , an acquisition unit 32 , a linear prediction coefficient expansion unit 33 , an excitation signal expansion unit 34 and a synthesis unit 35 .

[0075] The type obtaining unit 31 is used to obtain the type of the broadband signal; the types of the broadband signal obtained by the type obtaining unit 31 specifically include the following two types: the first type, when the encoding end does not transmit any other information except the low-frequency information When the decoding end classifies the low-frequency signal according to the time-frequency parameters of the low-frequency signal, the type of the low-frequency signal obtained by classification is regarded as the type of the wide-band signal; A small amount of other information is transmitted, and the broadband signal type information is transmitted to the d...

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Abstract

The embodiment of the invention discloses band spreading method and apparatus, relating to the field of communications and can obtain wideband signals with better quality aiming at different signals of languages or types of languages. The band spreading method of the embodiment comprises the steps of: obtaining types of the wideband signals; obtaining a low band linear prediction coefficients of low band signals and low band pumping signals according to the type of the wideband signals and the low band signals; spreading the low band linear prediction coefficients according to the relation between the pitch pairs of the low band spectrum frequency parameters to obtain wideband linear predication coefficients, and spreading the low band pumping signals to obtain the wideband pumping signals; and synthesizing the wideband linear prediction coefficients and the wideband pumping signals to obtain the wideband signals. The embodiment of the invention is mainly applied to spreading the band.

Description

technical field [0001] The invention relates to the field of communication, in particular to a frequency band extension method and device. Background technique [0002] Due to the limitations of transmission bandwidth and other conditions, voice signals in a traditional PSTN (Public Switched Telephone Network, Public Switched Telephone Network) network are all transmitted in a narrowband form. The narrowband signal greatly limits the quality of human hearing. [0003] In view of the above problems, the prior art provides a simple and effective method for obtaining wideband voice without switching the current narrowband network, which is blind frequency band extension technology. The current blind extension technology is basically processed in the time domain. The specific operations include: firstly perform linear prediction analysis on the narrowband signal to obtain the linear prediction coefficient and residual signal of the narrowband signal, and then convert the narrow...

Claims

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Application Information

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IPC IPC(8): G10L21/02G10L19/06G10L21/038
CPCG10L21/038G10L19/06
Inventor 刘泽新苗磊齐峰岩陈龙吟郎玥吴文海胡晨张清
Owner HONOR DEVICE CO LTD
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