Multi-channel electro-acoustic transfer function measurement method

Abstract

The invention relates to a multi-channel electro-acoustic transfer function measurement method and belongs to the technical field of electro-acoustic transfer function measurement. The multi-channel electro-acoustic transfer function measurement method includes that L loudspeakers and M microphones are arranged in a space to form an electro-acoustic transfer system; any one loudspeaker l in the electro-acoustic transfer system is independently controlled by an excitation electric signal el (t) of the loudspeaker l; sounds generated by all the loudspeakers are obtained through simultaneous measurement of the M microphones, and the mth microphone measures a sound pressure signal pm (t); the transfer relation between the loudspeaker excitation electric signal el (t) and the sound pressure signal pm (t) measured by the microphone is defined to be a transfer function; and the loudspeaker excitation electric signal el (t) controls the loudspeakers to generate sounds, and the transfer function is calculated by measuring the sound pressure signal pm (t) and the loudspeaker excitation electric signal el (t). The multi-channel electro-acoustic transfer function measurement method is comparable to a simple-frequency signal method in measurement accuracy, and simultaneously has the advantage of high efficiency.

Description

technical field [0001] The invention belongs to the technical field of electroacoustic transfer function measurement, in particular to a method for measuring and calculating the electroacoustic transfer function from multi-channel audio signals to multi-point positions in space. Background technique [0002] Electroacoustic transfer function has been widely used in the field of acoustics. The transfer function refers to the excitation electrical signal from the loudspeaker e l (t) and the sound pressure signal p received by the microphone m The frequency-domain transfer relationship between (t), there is a relationship between them as shown in formula (1): [0003] P m (f)=H ml (f)E l (f) (1) [0004] In formula (1), E l (f) is the excitation electrical signal e of the lth speaker l (t) magnitude spectrum, P m (f) is the sound pressure signal p measured by the mth microphone m (t) magnitude spectrum, H ml (f) for E l (f) and P m (f) transfer function between. W...

AI Technical Summary

Problems solved by technology

However, the frequency sweep signal method is still time-consuming when measuring the multi-channel transfer function, and when using the correlation method, it often requires a lot of experiments due to the need to introduce random signals, and the measurement accuracy cannot be compared with the single-frequency signal method.

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