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Study on Artificial Bandwidth Extension of Speech Signal

Author: ZhaoChengYong
Tutor: YinFuLiang；Chen
School: Dalian University of Technology
Course: Communication and Information System
Keywords: Voice bandwidth expansion Audio Watermarking High-frequency parameters Broadband voice Vector quantization
CLC: TN912.3
Type: Master's thesis
Year: 2011
Downloads: 13
Quote: 0
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Abstract


In a fixed telephone communication network , the transmission of voice is 8kHz the sampling frequency of the narrowband speech . Narrowband voice missing the high-frequency part of the energy , this voice sounds weak , powerless \With the emergence of broadband codec system , broadband voice communication possible . However , the upgrade of the communications network is a complex , long and gradual process , and how as soon as possible under the conditions of existing network transmission of broadband voice quality becomes a real problem to be solved . There is a way to achieve broadband voice communications in the case does not change the network structure , this is the voice artificial bandwidth expansion . Studied speech bandwidth extension algorithm based on information hiding technology , the main work is as follows : ( 1 ) study the voice of the digital model , linear predictive analysis related to the solution of the audio watermark and vector quantization techniques . (2) discusses the extraction of the parameters of the temporal envelope of the high - frequency voice , frequency-domain envelope parameters , the average time-domain envelope parameters and average frequency domain envelope parameters , methods, and the extracted parameters is compressed using vector quantization techniques . Design method using the synthesis of a high - frequency component of the frequency parameters . ( 3) study the characteristics of the audio watermark and various watermark embedding algorithm , two improved lowest significant bit watermarking algorithm is designed , and the compression of high-frequency information embedded narrowband voice . ( 4) to study the synthesis of the high - frequency component in the G.711.1 protocol , the extracted MDCT coefficients of the high - frequency voice compression coding , and the coefficients extracted . (5) with the C language voice bandwidth extension method to achieve complete objective test and subjective test of voice quality on both algorithms were compared . The experimental results show that this paper, two bandwidth extension algorithm wideband speech synthesis to achieve the expected results . Bandwidth expansion algorithm complexity control in a certain range , the synthetic wideband speech auditory effect than the narrowband voice has been greatly improved .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Electro-acoustic technology and speech signal processing > Speech Signal Processing
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