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Objective measurement of audio quality

一种音频质量、客观感知的技术，应用在语音分析、仪器等方向，能够解决不能评价信号质量等问题

Inactive Publication Date: 2013-04-10
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

PESQ performance is also limited by its inability to evaluate the quality of signals with large differences in bandwidth

Method used

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  • Objective measurement of audio quality
  • Objective measurement of audio quality
  • Objective measurement of audio quality

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Experimental program
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Embodiment Construction

[0021] In the following description, units performing the same or similar functions are denoted by the same reference names.

[0022] The present invention generally relates to psychoacoustic methods that mimic auditory perception for evaluating signal quality. The human process of evaluating signal quality can be divided into two main steps, such as figure 1 Shown, that is, auditory processing and cognitive mapping. The auditory processing block 10 contains the part that transforms actual sound into neural stimulation. The process includes Bark scaling frequency mapping and conversion from signal power to perceived loudness. The cognitive mapping block 12 connected to the auditory processing block 10 is where the brain extracts the most important features of the signal and evaluates the overall quality.

[0023] Such as figure 2 As shown, the objective quality assessment process involves both perceptual transformation and cognitive processing to mimic human perception. ...

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Abstract

In an apparatus for objective perceptual evaluation of speech quality, parameters BandwidthRef and BandwidthTest representing the bandwidth are forwarded to a calculator 30 for calculating the relative bandwidth difference DeltaBW between a reference signal and a test signal. DeltaBW is forwarded to a calculator 32, which determines the value of a weighting parameter alpha. Preferably a sealing unit 33 scales or normalizes the disturbance density D and the asymmetric disturbance density DA, for example to the range [0,1]. The values of DeltaBW and alpha are forwarded to a bandwidth compensator 34, which also receives the preferably scaled disturbance density D and asymmetric disturbance density DA. The bandwidth compensated disturbance densities D*, DA* are forwarded to a linear combiner 42, which forms a score representing predicted quality of the test signal.

Description

technical field [0001] The present invention generally relates to objective measurement of audio quality. Background technique [0002] PEAQ is an ITU-R standard for objective measurement of audio quality, see [1]. This is a method that reads the raw audio waveform and the processed audio waveform, and outputs an estimate of the perceived overall quality. [0003] PEAQ performance is limited by its inability to evaluate the quality of signals with large differences in bandwidth. Furthermore, since PEAQ relies on neural network weights trained on a limited database, PEAQ exhibits poor performance when evaluated on unknown data. [0004] PESQ is an ITU-T standard for objective measurement of audio (speech) quality, see [2]. PESQ performance is also limited by its inability to evaluate the quality of signals with large differences in bandwidth. Contents of the invention [0005] The purpose of the invention is to enhance the performance of objective perceptual assessment ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L25/03
CPCG10L25/69
Inventor 沃洛佳·格兰恰诺夫苏珊娜·马尔姆
Owner TELEFON AB LM ERICSSON (PUBL)