Extraction of channels from multichannel signals utilizing stimulus

摘要

An approach and device for optimizing a sound system by extracting a two-channel stereo source out of a set of multiple channels with unknown frequency responses, crosstalk, time delays and sample rate by employing a digital test sequence that utilizes maximum-length-sequences (MLS) that is fed into the sound system and results in a reconstructed stereo source that may be further used as an input to a signal processor that performs improved speaker and room equalization.

主权项

1. An audio device connected to an existing sound system comprising:
at least a first audio input and a second audio input configured to receive at least a first audio signal and a second audio signal, each of the first audio input and the second audio input associated with respective channels; a capture mechanism that captures at least first output data associated with the first audio signal and second output data associated with the second audio signal, the first output data and second output data captured from the existing sound system; a digital signal processor having a parameter estimation unit and a memory, the parameter estimation unit configured to process the first output data and the second output data to obtain a plurality of parameters that are stored in the memory, the parameter estimation unit comprising a sample rate estimation module estimating a sampling rate of the first output data and the second output data, a cross correlation module configured to generate impulse response sequences of the existing sound system, a delay estimation module configured to estimate delays between the respective channels, a polarity module configured to determine polarities in the respective channels, wherein the plurality of parameters are applied by the digital signal processor to subsequent first audio signals and second audio signals.