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
CN1538667AInactive Publication Date: 2004-10-20WUHAN UNIV
0 Cites 19 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
WUHAN UNIV
Publication Date
2004-10-20
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More