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A kind of speech enhancement method applied to ultra-short wave radio

An ultrashort wave radio station and voice enhancement technology, which is applied in the field of communication, can solve problems such as not being able to effectively improve the signal-to-noise ratio, and achieve the effect of a priori accurate signal-to-noise ratio and improved voice signal-to-noise ratio

Active Publication Date: 2021-09-14
CHENGDUSCEON TECH
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: at present, the main voice enhancement method of the ultrashort wave radio station is to cascade a simple voice enhancement algorithm after signal demodulation to achieve the purpose of improving the voice signal-to-noise ratio, but it is only a simple voice enhancement algorithm cascaded The voice enhancement algorithm can not meet the requirement of effectively improving the signal-to-noise ratio, and the present invention provides a voice enhancement method applied to ultrashort wave radio stations to solve the above problems

Method used

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  • A kind of speech enhancement method applied to ultra-short wave radio
  • A kind of speech enhancement method applied to ultra-short wave radio
  • A kind of speech enhancement method applied to ultra-short wave radio

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Embodiment

[0042] The present invention provides an FM radio used in speech enhancement methods, such as figure 2 , The specific operation is as follows:

[0043] Setp.1, began receiving signal.

[0044] Setp.2, carrier indication determined:

[0045]In the ultrashort wave radio voice enhancement, according to the structural characteristics of the ultrashort wave station, the carrier lock indication is added to the voice enhancement to determine whether the signal is present. When the carrier indicates that noise sample is made, the carrier indicates a few frames before the voice start after the carrier indicator is a noise frame. Because in the communication process, there is a process from pressing the transit control switch to the beginning of the speech, and according to the requirements of the speech signal, each frame signal is between 10 and 30 milliseconds, and the frame and the frame are again. There is approximately 50% of frame overlapping, so it can be considered that the carrier...

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Abstract

The invention discloses a speech enhancement method applied to an ultrashort wave radio station. The speech enhancement method is to obtain the enhanced speech signal by using the maximum posterior probability algorithm after the received speech signal is preprocessed; In the calculation process of the algorithm, the prior signal-to-noise ratio parameters are optimized through an adaptive filter. The invention combines the characteristics of the ultrashort wave radio station, combines the ultrashort wave radio station and the speech enhancement technology more effectively, accurately estimates the noise, improves the speech enhancement effect, and optimizes the speech enhancement algorithm to significantly increase the signal-to-noise ratio.

Description

Technical field [0001] The present invention relates to communication technologies, and in particular, to a VHF station used in speech enhancement method. Background technique [0002] Currently, to improve the signal to noise ratio FM radio speech largely from improved channel index, improved modulation and demodulation method, optimization of circuit design. Although these methods can improve the signal to noise ratio in a speech to some extent, but the effect is not ideal. Especially for voice communication interference between the background noise, these methods can not completely improve the SNR of speech. So, how to improve FM radio voice signal to noise ratio of FM radio is one of the difficulties, but also reflects an important symbol of FM radio performance. [0003] Speech enhancement technology is an effective method to improve one voice signal to noise ratio, most FM radio is not using speech enhancement technology, even if the individual stations using the voice enha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L21/02G10L21/0208G10L21/0216
CPCG10L21/02G10L21/0208G10L21/0216
Inventor 姚元飞王群陈洪瑀
Owner CHENGDUSCEON TECH
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