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Auditory filter shapes at 8 and 10 kHz.

M J Shailer¹, B C Moore, B R Glasberg

¹Department of Experimental Psychology, University of Cambridge, England.

The Journal of the Acoustical Society of America

|July 1, 1990

Summary

Auditory filter shapes were measured using notched-noise masking. Results show filter bandwidths change with sound level, with steeper slopes at lower levels and differing asymmetry at 10 kHz.

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Area of Science:

Auditory perception
Psychoacoustics
Signal processing

Background:

Understanding auditory filter shapes is crucial for modeling human hearing.
Previous research has explored auditory filters, but data at higher frequencies and varying sound levels is essential.

Purpose of the Study:

To derive auditory filter shapes at 8 kHz and 10 kHz using notched-noise masking.
To investigate the effect of sound spectrum level on auditory filter bandwidth and shape.

Main Methods:

Auditory filter shapes were measured using notched-noise masking at 8 kHz (N0=20, 35, 50 dB) and 10 kHz (N0=50 dB).
Insert earphones with custom earmolds were used to minimize placement variability and ensure a flat frequency response.
A frequency-dependent attenuation function was estimated and applied to derive filter shapes.

Main Results:

At 8 kHz, mean equivalent rectangular bandwidths (ERBs) were 677, 637, and 1011 Hz for N0=20, 35, and 50 dB, respectively.
Filters at 50 dB were roughly symmetrical; at lower levels, the low-frequency skirt was steeper.
The mean ERB at 10 kHz was 957 Hz, with varying filter asymmetry across subjects.

Conclusions:

Auditory filter bandwidth is influenced by the overall sound spectrum level.
Filter shape asymmetry varies with frequency and sound level.
These findings contribute to a more comprehensive understanding of auditory processing at higher frequencies.

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