Method and device for completely evaluating 3G visual telephone quality

Abstract

The invention provides a method for detecting whether frames drop and counting the number of the dropped frames according to number continuity by using the characteristic that an adaptation layer (AL2) of an H.324M protocol stack can carry frame numbers, and gives a method for processing video interpolated frames, audio interpolated frames and wrong frames. Alignment of a sending frame sequence and a receiving frame sequence is replaced with non-accurate alignment of a PEVQ (Perceptual Evaluation Of Video Quality) algorithm and a PESQ (Perceptual Evaluation Of Speech Quality) algorithm, the evaluation is carried out by using aligned receiving and sending speech and video frame sequences, therefore, processing speed and accuracy of the original algorithm can be greatly improved. By using the sending rate of the H.324M protocol, relevant parameters are accurately calculated and an accurate non-aligned AVI (Audio Video Interleaved) file is synthesized by sending audio and video data withfixed size by using the characteristics that the sending time can be dynamically regulated and the sending rate of the H.324M protocol can be set in advance, and audio and video synchronization evaluation and video telephone integral quality evaluation are accurately carried out by using an AVET (Advanced Video Quality Evaluation) algorithm.

Description

technical field [0001] The invention relates to a method and a device for comprehensively evaluating video phone quality based on the H.324M protocol, which are applied to 3G mobile wireless network drive test products. Background technique [0002] The mobile wireless network drive test system is a system for planning and optimizing the mobile wireless network by using tools such as test software, test mobile phones, frequency scanners, electronic maps, GPS and test vehicles. It mainly meets the needs of network cell site selection, daily network optimization, and radio frequency quality assessment. [0003] Video telephony is a major service of 3G wireless networks, and video telephony quality evaluation is an important test index for drive test optimization. Video telephony quality assessment mainly includes three categories: 1. Audio quality assessment; 2. Video quality assessment; 3. Audio and video synchronization assessment. In terms of evaluation methods, it is div...

AI Technical Summary

Problems solved by technology

[0004] The three algorithms PESQ, PEVQ and AVET used for objective evaluation are independent of the specific application environment. The effectiveness of these algorithms and the time-consuming degree of processing are different in different application environments. In the quality evaluation of 3G video phone One of the main factors affecting the effectiveness of these algorithms is that they cannot accurately know the error frame, frame drop and delay of audio and video signals during transmission.

These three algorithms compare the sent sample audio and video frame sequence with the received degraded frame sequence for frame-by-frame evaluation, so a certain alignment method will be used to match the sent and received frames one by one, and match The method is to use the characteristics of the signal itself to make a fuzzy estimation, and it is impossible to accurately match each frame sent with each frame received, and the more wrong frames and dropped frames in the received frame sequence, the delay The larger the time, the more difficult it is to align, which results in a decrease in the accuracy of the evaluation and an increase in processing time

At the same time, the video phone of 3G network itself is a transmission channel with low bit rate and high bit error rate. The frame drop and error rate are relatively high. Evaluation algorithm, the resulting MOS (mean intention score) score is often low, the evaluation takes a long time, and cannot truly and quickly reflect the communication quality of the network

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