standardaudiogram
Standard audiograms for various hearing-loss types

Usage:

[ACout, fout, category] = standardaudiogram(type)
[ACout, fout, category] = standardaudiogram(type, fspec)

Input parameters:

`type`	'N0' to 'N7' or 'S1' to 'S3' according to Bisgaard et al. (2010)
`fspec`	optional specification of frequencies

Output parameters:

`ACout`	Hearing loss (in dB HL) as air conduction loss
`fout`	Corresponding output frequencies (in Hz)
`category`	'Mild', 'Moderate' etc, see below

Description:

Standard audiograms according to Bisgaard et al. (2010), with the additional type 'N0' describing normal hearing.

The N-types describe the groups of flat and moderately sloping listeners along the following category:

N0: Normal
N1: Very mild
N2: Mild
N3: Moderate
N4: Moderate/severe
N5: Severe'
N6: Severe'
N7: Profound'

The S-types describe the groups of steep sloping listeners along the following category:

S1: Very mild
S2: Mild
S3: Moderate/severe

standardaudiogram(type, fspec) outputs the hearing loss interpolated for fspec frequencies along the logarithmic frequency scale.

References:

N. Bisgaard, M. S. M. G. Vlaming, and M. Dahlquist. Standard Audiograms for the IEC 60118-15 Measurement Procedure. Trends in Amplification, 14(2):113--120, jun 2010. [ DOI ]