Broad frequency band voice quality objective evaluation method

An objective evaluation method and voice quality technology, applied in digital transmission systems, data exchange networks, electrical components, etc., can solve the problems that cannot meet the objective quality evaluation requirements of packet networks and broadband voice objective quality evaluation requirements, and achieve The effect of increasing relevance

Inactive Publication Date: 2004-10-20
WUHAN UNIV
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Problems solved by technology

The objective quality evaluation method of the original telephone bandwidth (300 ~ 3400Hz) voice has the following deficiencies: a, cannot meet the objective quality evaluation requirements of broadband voice; b, cannot meet the objective quality evaluation after the intermittent transmission is adopted on the packet network Require

Method used

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  • Broad frequency band voice quality objective evaluation method
  • Broad frequency band voice quality objective evaluation method
  • Broad frequency band voice quality objective evaluation method

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Experimental program
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Embodiment Construction

[0036] Attached below figure 1 ~ 3 further illustrate the present invention.

[0037] The present invention proposes a kind of broadband speech quality objective evaluation method, and its steps are:

[0038] (1) The test speech and the reference speech amplitude are normalized to a sequence with a mean value of 0 and a standard deviation of 1;

[0039] (2) Calculate the critical band hearing threshold in the 50-7000 Hz frequency band;

[0040] (3) Calculating the quiet frame threshold according to the energy of the windowed speech frame, if the energy of a frame of speech is less than the quiet frame threshold, this frame signal does not participate in the quality evaluation. Quiet frame speech energy threshold En SilenceTh is the energy En compared to the maximum energy frame Max , its energy is lower than 15dB;

[0041] (4) Calculate the power spectrum of the signal after normalization;

[0042] (5) summing in the critical band to obtain the Bark spectrum;

[0043] (...

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Abstract

Tested speech and reference speech are normalized as a sequence with mean being 0 and standard deviation being as 1. Auditory threshold of critical zone within 50-7000Hz is recorded and calculated calculating threshold of quiet frame based on energy on speech frame with window added; calculating power spectrum for normalized signal; obtaining Bark spectrum from summation in critical zone; calculating loudness of the speech frame; determining perceptible distortion symbol from loudness and noise masking threshold etc. giving out distortion for each frame; repeating above steps, calculating distorted WBSD in whole speech section, and WBSD in whole speech section, which is obtained after accumulating and average operation for non-quiet frame and quiet frame. Good correlation between result from the method and subjective quality measure is obtained.

Description

technical field [0001] The invention belongs to the field of voice communication quality evaluation, in particular to an objective quality evaluation method for broadband voice communication on a data network. Background technique [0002] When transmitting voice services over a data network, the quality of service must be considered. In order to effectively utilize the bandwidth, voice coding technology and voice activity detection technology are used to realize discontinuous transmission (DTX). The signal received by the listener and the signal sent by the speaker are in the time domain Not strictly synchronized. At the same time, due to the improvement of people's demand for call quality, broadband (50-7000 Hz) voice communication has been more widely used because of its higher intelligibility, naturalness, and clarity. The objective quality evaluation method of the original telephone bandwidth (300 ~ 3400Hz) voice has the following deficiencies: a, cannot meet the objec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/24H04L12/26H04L29/02H04M3/18
Inventor 胡瑞敏艾浩军涂卫平
Owner WUHAN UNIV
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