Broadband excitation signal synthesis method based on segmented expansion

An excitation signal and broadband excitation technology, applied in speech analysis, instruments, etc., can solve problems such as damage, the complexity of algorithm operation should not be too high, and the algorithm is difficult to implement, and achieve the goal of improving communication quality, preserving harmonic structure, and improving performance. Effect

Inactive Publication Date: 2015-11-11
SYSU CMU SHUNDE INT JOINT RES INST +1
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Problems solved by technology

Although these three methods are relatively mature at present, their disadvantages lie in that the appropriate harmonic structure must be preserved in the synthesized excitation signal, and too many artificial harmonics must not be in...

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  • Broadband excitation signal synthesis method based on segmented expansion
  • Broadband excitation signal synthesis method based on segmented expansion
  • Broadband excitation signal synthesis method based on segmented expansion

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Embodiment 1

[0026] Such as figure 2 As shown, a broadband excitation signal synthesis method based on segment extension, including the following steps:

[0027] S1: Pass the narrowband speech signal through upsampling and frame preprocessing and then pass the analysis filter to obtain the narrowband excitation signal u n ;

[0028] S2: the narrowband excitation signal u n Through a low-pass filter with a cut-off frequency of α1, the first frequency band excitation signal u is output l , for the first frequency band excitation signal u l Perform spectral shifting operation, pass the spectrally shifted signal through a high-pass filter with a cutoff frequency α1, and obtain the second frequency band excitation signal u m ; Wherein, the value range of the cut-off frequency α1 is: 3000-3500HZ;

[0029] S3: Set up a unit white noise generator to generate a white noise signal u f , calculate the excitation signal u of the first frequency band l The variance of gets the gain factor adj...

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Abstract

The invention provides a broadband excitation signal synthesis method based on segmented expansion. According to the method, two methods of narrow-band excitation spectrum translation and white noise excitation are combined, narrow-band excitation signals pass through a low-pass filter, first frequency-band excitation signals are outputted, after the translation of the first frequency-band excitation signal spectrum and high-pass filtering of the first frequency-band excitation signals are performed, second frequency-band excitation signals are obtained, white noise via energy adjustment is multiplexed by gain factors to obtain third frequency-band excitation signals, and finally, the first frequency-band excitation signals, the second frequency-band excitation signals, and the third frequency-band excitation signals are synthesized to form complete broadband excitation signals. According to the method, the harmonic structure of the excitation signals can be well reserved, too many artificial harmonic waves are not introduced, the operation complexity of the algorism is not high, the realization is easy, the performance of the conventional bandwidth expansion technology is improved, and the communication quality of narrow-band voice is improved.

Description

technical field [0001] The present invention relates to the technical field of speech signal processing, and more specifically, to a method for synthesizing broadband excitation signals based on segment expansion. Background technique [0002] Due to the limitation of its transmission bandwidth, the traditional telephone network can only communicate with narrowband voice. Although the narrowband voice can meet the basic communication requirements, the communication quality is greatly reduced. Due to economic reasons, it is impossible to realize real broadband transmission in a short period of time on the old telephone network. The emergence of artificial voice bandwidth expansion technology solves this problem. This technology does some processing at the receiving end of the telephone network, and artificially adds some missing frequency band components to the received narrowband voice signal, so that the receiving end outputs broadband with higher auditory quality. Speech ...

Claims

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Application Information

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IPC IPC(8): G10L21/0232
Inventor 李宇林胜义谭洪舟农革
Owner SYSU CMU SHUNDE INT JOINT RES INST
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