A revised method of calculating auditory exciation patterns and loudness for time-varying sounds
ICASSP(2012)
Abstract
Previously we described a method of calculating auditory excitation patterns and loudness for steady sounds, based on a nonlinear filterbank. Here the method is extended to deal with time-varying sounds. Firstly, the input waveform is transformed to short-term spectrum by a structure with six FFTs, which using longer signal segments for low frequencies and shorter segments for higher frequencies. Secondly, the excitation patterns are calculated from the short-term spectrum, and the summation of the excitation gives a value for the instantaneous loudness. Thirdly, the short-term loudness is calculated from the instantaneous loudness using an averaging mechanism similar to an automatic gain control system, with attack and release times. Finally the long-term loudness is calculated from the short-term loudness using a similar averaging mechanism, but with longer attack and release time. The method gives good predictions of loudness for both steady sounds and time-varying sounds.
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Key words
loudness calculation,time-varying sound,steady sound,excitation summation,auditory excitation patterns,short-term spectrum,instantaneous loudness,automatic gain control,long-term loudness,fft,time-varying sounds,auditory exciation pattern calculation,steady sounds,short-term loudness,averaging mechanism,audio signal processing,loudness,fast fourier transforms,automatic gain control system,bandwidth,gain control,noise,active filters
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