Normalisation of autocorrelation parameters. More...

Functions
int	spr_norm_aut_setup (SprSspInfo Info, const char descript, void aux_info)

int	spr_norm_aut_process (SprSspInfo Info, const void frame_in, void *frame_out)

void	spr_norm_aut_reset (SprSspInfo Info, SprSspStatus action)

void	spr_norm_aut_free (SprSspInfo *Info)

Detailed Description

Normalisation of autocorrelation parameters.

This routine normalises the input autocorrelation parameters. First, a peak level, the maximum first autocorrelation coefficient, is needed. This maximum can be given, or the maximum of the first X frames in the file is taken (if X is -1, the maximum in the whole file is taken). If MASKING is asked for, a constant is calculated as the peak_level minus the given SNR. This constant is added to the first autocorrelation coefficient in all frames. If NORMALISATION is asked for, a constant gain is calculated as the given target level minus the peak level. All autocorrelation coefficients in all frames are multiplied with this gain.

[norm_aut]
`nfr <number>`
Number of frames used for searching the maximum. Set it to -1 (default) if all frames will be used. Overruled if a peak level is given.
`peak_level <peak>`
Peak energy (first autocorrelation coefficient), not in dB. If not given, the largest number in the first X frames (see nfr option) is used.
`normalise [target]`
Perform normalisation with given target peak level after normalisation (in dB, default 60.0 dB).
`mask [SNR]`
Perform masking with given remaining SNR after masking (in dB, default 30.0 dB).

Author: Dirk Van Compernolle (algorithm); Jacques Duchateau (ssp routines)

Date: 1 Sep 1991, 22 Feb 1995

Functions

Detailed Description