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tINY · 21st June 2007

When you take an IR, the computer looks at the resulting waveform and constructs an FIR filter.

This filter has a bunch of delays with a co-efficient value for each "tap". For 44.1k sampling, these taps are offset from each other by about 22.676 microseconds. To convolve a signal with the impulse response, the signal is sent through the FIR, which sends it out and adds it with the delayed signals multiplied by the co-efficients.

You can reverse this process mathmatically - there will be a long delay from input to output (equal to the longest tap delay in the initial convolution).

-tINY

FDI DSP - Digital Signal Processing - Design Guide
Finite impulse response - Wikipedia, the free encyclopedia
Convolution - Wikipedia, the free encyclopedia
Deconvolution - Wikipedia, the free encyclopedia

21st June 2007	#6
tINY Gear Guru Joined: Jul 2004 Location: Orygun Posts: 10,228	When you take an IR, the computer looks at the resulting waveform and constructs an FIR filter. This filter has a bunch of delays with a co-efficient value for each "tap". For 44.1k sampling, these taps are offset from each other by about 22.676 microseconds. To convolve a signal with the impulse response, the signal is sent through the FIR, which sends it out and adds it with the delayed signals multiplied by the co-efficients. You can reverse this process mathmatically - there will be a long delay from input to output (equal to the longest tap delay in the initial convolution). -tINY FDI DSP - Digital Signal Processing - Design Guide Finite impulse response - Wikipedia, the free encyclopedia Convolution - Wikipedia, the free encyclopedia Deconvolution - Wikipedia, the free encyclopedia