Computational and Auditory Signal Processing

FREQTOAUD - Converts frequencies (Hz) to auditory scale units.

Usage:

aud = freqtoaud(scale,freq);

Description:

FREQTOAUD(scale,freq) converts values on frequency scale (measured in Hz) to values on the selected auditory scale. The value of the parameter scale determines the auditory scale:

'mel'	The mel scale is a perceptual scale of pitches judged by listeners to be equal in distance from one another. The reference point between this `scale` and normal frequency measurement is defined by equating a 1000 Hz tone, 40 dB above the listener's threshold, with a pitch of 1000 mels. The mel-scale is defined in Stevens et. al (1937).
'bark'	The bark distance of 1 on the bark `scale` is known as a critical band. The implementation provided in this function is described in Traunmuller (1990).
'erb'	A distance of 1 erb is equal to the equivalent rectangular bandwidth of the auditory filters at that point on the frequency `scale`. The `scale` is normalized such that 0 erbs corresponds to 0 Hz. The width of the auditory filters were determined by a notched-noise experiment. The erb `scale` is defined in Glasberg and Moore (1990).
'erb83'	This is the original defintion of the erb scale given in Moore. et al. (1983).

References:

B. Glasberg and B. Moore. Derivation of auditory filter shapes from notched-noise data. Hearing Research, 47(1-2):103, 1990.

B. Moore and B. Glasberg. Suggested formulae for calculating auditory-filter bandwidths and excitation patterns. The Journal of the Acoustical Society of America, 74:750, 1983.

S. Stevens, J. Volkmann, and E. Newman. A scale for the measurement of the psychological magnitude pitch. The Journal of the Acoustical Society of America, 8:185, 1937.

H. Traunmüller. Analytical expressions for the tonotopic sensory scale. The Journal of the Acoustical Society of America, 88:97, 1990.

E. Zwicker. Subdivision of the audible frequency range into critical bands (frequenzgruppen). The Journal of the Acoustical Society of America, 33(2):248-248, 1961. [ DOI | http ]

Categories:

This function

See also:

Plots

Filters

Auditory scales

Properties of the auditory system

Model stages

General signal processing

FREQTOAUD - Converts frequencies (Hz) to auditory scale units.

Description:

References: