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The Study of Real-time Speech Enhancement Algorithm for Broadcasting Station

Author: LiBenJun
Tutor: HanFangJing；SunZhiXin
School: National University of Defense Science and Technology
Course: Information and Communication Engineering
Keywords: Speech Enhancement Auditory masking Critical band uClinux Blackfin
CLC: TN912.3
Type: Master's thesis
Year: 2008
Downloads: 93
Quote: 1
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Abstract


The ultrashort wave half-duplex FM radio is widely used in our military radio voice , data transmission equipment, can be susceptible to interference of complex electromagnetic environment due to electromagnetic waves in the transmission , the received voice usually introduced a lot of noise , a serious impact on the receiving end of voice intelligibility , comfort , easily lead to auditory fatigue . Dissertation radio speech enhancement undertake studies . The principle of the work consisted primarily of the following: (1) on the basis of analysis of ultrashort half-duplex voice transmission and noise characteristics of the FM radio , first of the Wiener filter based on the ETSI standard speech enhancement algorithm , the algorithm and points , pointed out that the algorithm has poor performance in non-stationary and low signal-to-noise ratio environment , the main reason is that it uses to distinguish between noise and speech speech endpoint detection based on time-domain energy the algorithm reliability is not high , in the low signal confusingly noise ratio of the case , in addition to the complexity of the algorithm , the large amount of calculation is also a drawback . ( 2 ) of the spectral subtraction speech enhancement algorithm based on minimum statistics , the algorithm does not require the endpoint detection can be better to remove noise in the signal , and a significant improvement in stability than the ETSI algorithm , but the algorithm of the minimum are square error criterion voice after the treatment has obvious musical noise to the auditory discomfort . ( 3 ) in order to overcome the shortcomings based on the minimum statistics of spectral subtraction speech enhancement algorithm to study the characteristics of the reaction of human auditory critical band and auditory masking , combined with the smallest statistical algorithms , and removed musical noise . (4) as the core of high - speed fixed-point DSP chip BF533 , completed the hardware circuit design and debugging of embedded speech signal processing platform in the circuit transplant uClinux operating system , developed device drivers , and build a complete embedded voice signal processing platform . Developed based on the fixed-point C code of the proposed algorithm has been optimized for the BF533 , and successfully transplanted to the speech signal processing platform . Finally, for the system to achieve a voice assessment .

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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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