A Compensation Method for Time Delay and Frequency Response Characteristics of Multi-output Channel Audio System

Abstract

The invention discloses a method for compensating delay and frequency response characteristics of multi-output channel sound system and system implementation thereof. The method comprises the following steps that firstly, phase difference between channels of a multi-channel output device is measured, so that the situation that the multi-channel output device itself is in the state of synchronously outputting signals is ensured; then the delay of the signals which are output by the multi-channel output device and pass through a signal processing system, a loudspeaker box and a space transmission routine to reach a specific audition area is estimated through a delay estimation method, and delay compensation is conducted on the channels by comparing delay difference between the channels; finally, an FIR frequency response compensating filter is designed and achieved according to actually detected frequency response curves of a signal transmission routine, and the part above the low and medium frequency in the frequency response curves of the multiple channels is compensated into a straight line through the filter as far as possible. By means of the method, when sound waves transmitted out of each loudspeaker box reach the audition area, the phases of the sound waves are basically the same, and the frequency response characteristics of the channels are basically the same.

Description

technical field [0001] The invention belongs to the application field of audio frequency and electroacoustic technology, and relates to a synchronous compensation method for differences between channels in a multi-output channel audio system. The method can eliminate the differences between channels in a multi-output channel sound system, so that the characteristics of the sound waves reaching a specific listening area through different channels are consistent, and can be widely used in high-end audio-visual equipment and special laboratories. Background technique [0002] Multi-channel audio systems are mainly used in theaters, cinemas, concert halls, auditoriums, gymnasiums, conference rooms and laboratories. The system is mainly composed of sound source, multi-channel output device and speaker box, the schematic diagram is as follows figure 1 shown. For some high-end audio-visual places or laboratories, it is required that the characteristics of the signals output throu...

AI Technical Summary

Problems solved by technology

However, since the distances from different speakers to the listening area are not the same, the time delays for the sound waves from different speakers to reach the listening area are different; on the other hand, due to the frequency response characteristics of speakers and power amplifiers of different channels The difference makes the frequency response characteristics of the signals output through different channels inconsistent

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