Excitation spread across frequency bands is modelled as convolution with a level-dependent spreading function.
Evidence
The next processing step emulates how the excitation evoked by a stimulus spreads to other frequency bands. The simplest emulation approach comprises a convolution with a spreading function, as in Equation (10.6), and such an approach is also exploited in the code above. The function approximates the shape of the simultaneous frequency masking curve at 60 dB SPL. In reality, the shape of such a curve is level dependent, which can be accounted for by selecting the spreading function in a level-dependent manner. This is neglected here, since it would make the structure of the auditory model far more complex. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1588
Categorization
- DEFINE: Explains what ‘spreading function’ means computationally — convolution emulating how excitation leaks across frequency bands.
- XREF: connects to: Frequency masking is modelled as convolution with a spreading function — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1588; Auditory masking spread can be modelled by convolving with a spreading function; Excitation patterns smooth the spectrum, blurring harmonic and formant detail the acoustic signal carries — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 508 (+2 more)
Broader Connections
- Frequency masking is modelled as convolution with a spreading function
#expands(0.85) — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 1588 - Auditory masking spread can be modelled by convolving with a spreading function
#expands(0.80) - Loudness at high sound levels arises from excitation spreading across adjacent frequency bands
#exemplifies(0.80) - Excitation patterns smooth the spectrum, blurring harmonic and formant detail the acoustic signal carries
#complicates(0.75) — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 508 - A compound action potential equals single-fibre waveform convolved with spike latency distribution
#complicates(0.72) — Dijk, Pim van, Physiology, Psychoacoustics and…, 2383