Test method for objectively evaluating voice quality of pickup system

Abstract

The invention provides a test method for objectively evaluating the voice quality of a pickup system. The test method mainly comprises the following steps of: testing sound field frequency response through a testing environment or direct calculation according to frequency response test signals; calculating an isostatic compensation function; carrying out isostatic compensation on standard test voice signals; playing the standard test voice signals treated with isostatic compensation, collecting the played voice signals through a pickup device of the pickup system to be tested so as to generate a degraded voice file; comparing the standard test voice signals with degraded voice signals to calculate PESQ value; calculating MOS-LQO value by utilizing a projected curve; and carrying out sample averaging to obtain the test result. The test method overcomes the limitation that the existing test method for objectively evaluating the voice quality can only carry out end-to-end measurement, and the test method can be used for testing the voice quality of the on-site monitoring pickup system.

Description

technical field [0001] The invention relates to a test method for objectively evaluating the voice quality of a sound pickup system. Background technique [0002] Audio monitoring has always been an important content in the field of security protection. Audio monitoring refers to the process of using certain electronic technology equipment and methods to monitor the sound of the monitored object. Audio monitoring includes wired monitoring and wireless monitoring. Wired monitoring refers to the method of collecting audio signals and then transmitting them through limited media such as audio cables and network cables. Wireless monitoring refers to the use of wireless communication to collect audio signals. It is transmitted in the form of electromagnetic waves and demodulated and received at the receiving end. [0003] A sound pickup system for on-site monitoring includes the following parts: (1) sound pickup part, (2) sound transmission part, (3) sound reception and processi...

AI Technical Summary

Problems solved by technology

Among the methods of subjective evaluation, the most widely used is the Mean Opinion Score (MOS) evaluation method. This method is obtained through a controlled test. In the test, a clean and undistorted speech signal is played through the pickup system After picking up, let a group of people listen to it at the receiving end, and then give a voice quality score of 1-5 points, and the average score of all test personnel is used as the final voice quality score. The disadvantage of using this method is: Time-consuming, labor-intensive, and high requirements for the subjects

[0007] Based on the PESQ algorithm, there are currently some test methods and test instruments for objectively evaluating voice quality. However, these test methods are all applied to end-to-end communication voice quality measurement. The tester uses an analog telephone interface to test the end-to-end gateway. When these methods are applied to voice quality measurement, the disadvantages are: the existing methods can only be applied to voice systems or devices with electrical interfaces (such as gateways, or analog audio interfaces), but not to similar Measurement of the pickup system of the monitoring system

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