The method is used in IIR filters (infinite impulse response) which are capable of filter slopes of 12 dB per octave & above, and FIR (finite impulse response) filters that can produce a 6 dB per octave slope. Put simply, this process involves multiplication (or division in the case of deconvolution) of two audio signals to produce a third (Collins 137). Underlying the use of IR files is the concept of convolution. In this article, I will explain some of the main principles behind the methodology, list some popular paid & freeware applications that use this technology, identify 3rd party sources of IR files and offer some creative approaches to making and using your own IRs. Impulse Response or IR files are used in audio processing for convolution reverbs and amp/cabinet emulations.
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