Room characterization and correction for multi-channel audio

摘要

Devices and methods are adapted to characterize a multi-channel loudspeaker configuration, to correct loudspeaker/room delay, gain and frequency response or to configure sub-band domain correction filters.

主权项

1. A method for characterizing a multi-channel loudspeaker configuration, comprising:
producing a first probe signal and a second pre-emphasized probe signal from a same frequency domain signal, producing the first probe signal further comprising:
generating the same frequency domain signal from a random number sequence;computing an inverse Fast Fourier Transform for the random number sequence to generate the first probe signal in the time domain; supplying the first probe signal to a plurality of audio outputs coupled to respective electro-acoustic transducers positioned in a multi-channel configuration in a listening environment for converting the first probe signal to a first acoustic response and for sequentially transmitting the acoustic responses in non-overlapping time slots separated by silent periods as sound waves into the listening environment; and for each said audio output,
receiving sound waves at a multi-microphone array comprising at least two non-coincident acousto-electric transducers, each converting the acoustic responses to first electric response signals;deconvolving the first electric response signals with the first probe signal to determine a first room response for said electro-acoustic transducer at each said acousto-electric transducer;computing and recording in memory a delay for said electro-acoustic transducer at each said acousto-electric transducer; andrecording the first room responses in memory for a specified period offset by the delay for said electro-acoustic transducer at each said acousto-electric transducer; based on the delays to each said acousto-electro transducer, determining a distance and at least a first angle to each said electro-acousto transducer; and using the distances and at least said first angles to the electro-acousto transducers, automatically selecting a particular multi-channel configuration and computing a position for each electro-acousto transducer in that multi-channel configuration within the listening environment.