nalrp
Hearing-aid gains according to the NAL-RP prescription procedure

Usage:

g = nalrp(htl,fhtl,f);

Input parameters:

`htl`	Audiogram (in dB HL). Usually obtained from standardaudiogram
`fhtl`	Audiogram frequencies (in Hz). Usually [250 500 1000 1500 2000 3000 4000 6000].
`f`	Vector with targetted frequencies (in Hz).

Output parameters:

`g`	Prescribed real-ear insertion gains (REIGs, in dB) at frequencies f. Size the same as f.

Description:

nalrp(..) returns gains as prescribed by the National Acoustics Laboratory (NAL) in their revised profound (RP) prescription procedure. The prescribed gains will be interpolated on the log-frequency scale to match frequencies in f. Note that nalrp does not account for the conduction loss.

References:

H. Dillon. Hearing Aids. Thieme;Boomerang Press, New York; Sydney, 2 edition, 2012.

D. Byrne and H. Dillon. The National Acoustic Laboratories' (NAL) new procedure for selecting the gain and frequency response of a hearing aid. Ear and Hearing, 7:257--265, 1986. [ http ]

D. Byrne, A. Parkinson, and P. Newall. Modified Hearing Aid Selection Procedures for Severe/Profound Hearing Losses. In The Vanderbilt Hearing-Aid Report II, pages 295--300. York Press, 1991.