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Objective assessment method for audio quality of compressed domain based on distortion correction

An objective evaluation method and objective evaluation technology, applied in the field of communication, can solve the problems of distortion and poor quality of speech signal coding, and achieve the effect of high accuracy, real-time calculation, and audio quality.

Inactive Publication Date: 2012-06-13
COMMUNICATION UNIVERSITY OF CHINA
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AI Technical Summary

Problems solved by technology

[0010] The audio encoder has a good effect on the encoding of ordinary audio signals, but the speech signal is special. When low-bit-rate audio compression is encoded, the quality of encoding the speech signal is poor, and obvious distortion can be heard

Method used

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  • Objective assessment method for audio quality of compressed domain based on distortion correction
  • Objective assessment method for audio quality of compressed domain based on distortion correction
  • Objective assessment method for audio quality of compressed domain based on distortion correction

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Embodiment Construction

[0039] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described below in conjunction with the figures.

[0040] image 3 with Figure 4 Shown is a flow chart of the present invention. The specific process is described as follows.

[0041] Step 1: Select 15 segments of audio to compress and decompress and perform subjective evaluation and scoring for parameter fitting in step 3 to obtain the fitting coefficient; perform distortion correction in step 5 to obtain the distortion correction coefficient. The length of each piece of audio is between 10 seconds and 20 seconds, and the types of audio include male voice, female voice, castanets, piano, symphony and film soundtrack, etc. Compress at bit rates of 16kbps, 24kbps and 32kbps respectively, and subjectively evaluate each piece of audio after compression and decompression, and obtain the subjective evaluation score of the compressed audio;...

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Abstract

The invention discloses an objective assessment method for audio quality of a compressed domain based on distortion correction, and belongs to the communication field. The objective assessment method is characterized by comprising the following steps of: extracting characteristic parameters including code rate, scale factor, pre-echo distortion, frequency distortion and speech coding distortion from a compressed audio stream; performing basic assessment on the audio quality according to the code rate and the scale factor, and giving an initial objective assessment score; and judging whether distortions exist according to the characteristic parameters of the pre-echo distortion, the frequency distortion and the speech coding distortion, and correcting the objective assessment score when the distortions exist so as to obtain a final objective assessment score. According to the objective assessment method disclosed by the invention, factors which influence the audio quality are taken full consideration, so that the objective assessment method can be used for simulating a subjective assessment result in a better manner.

Description

technical field [0001] The invention relates to a method for objectively evaluating audio quality and belongs to the field of communication. Background technique [0002] With the development of multimedia technology, digital compressed audio is widely used in the fields of network, broadcasting, film and television, and mobile multimedia communication. However, audio compression is lossy compression, and compression will cause a decrease in audio quality. In order to ensure better audio quality for the user, it is necessary to evaluate the quality of the compressed audio. Evaluation methods of audio quality include subjective evaluation methods and objective evaluation methods. [0003] The results of the subjective evaluation are consistent with the actual feelings of the human ear. However, subjective evaluation requires a large cost, time-consuming, and laborious; subjective evaluation is greatly affected by the listener's physiological and psychological conditions, l...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00G10L21/02G10L11/00G10L19/038G10L25/69
Inventor 赵艳明姜秀华石东新
Owner COMMUNICATION UNIVERSITY OF CHINA
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