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SPRAAK
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ordered statistics More...
Functions | |
| void | spr_ordstat_free (SprSspInfo *info) |
| int | spr_ordstat_setup (SprSspInfo *info, const char **descript, void *aux_info) |
| int | spr_ordstat_process (SprSspInfo *info, const void *frame_in, void *frame_out) |
| void | spr_ordstat_reset (SprSspInfo *info, SprSspStatus *action) |
ordered statistics
Calculate ordered statistics on a neighbourhood of each (time,frequency) point and output some derived statistics from that.
| [ordstat] | |
|---|---|
nfr <nfr>(1) [duplicate/mirror](mirror) | |
Time window (number of frames). Initial and final frames are handled by either mirroring the input data (extra inputs) or by duplicating the first/last complete output. | |
nfq <nfq>(1) [duplicate/mirror](mirror) | |
Frequency window (number of frequency tabs). The initial and final frequency tabs are handled by either mirroring the input data (extra inputs) or by duplicating the first/last complete output. | |
output pct <extrapolate/interpolate/nearest>(nearest) <frac>(0.0) ... | |
Replace each point in the central frame by point(s) at position <pct> after sorting (small to large). With the 'nearest' option, point min(floor(pct*Npt),Npt-1) is taken. The other options interpolate between the two neighbouring points. With the interpolate option, the sorted points [0...Npt-1] correspond to pct=[0.0,...,1.0]. With the extrapolate option, the sorted points correspond to pct=[0.5,...,Npt-0.5]/Npt. This means that if pct < 0.5/Npt or pct > 1.0-0.5/Npt, the returned values need to be extrapolated. | |
output noise_mean <log/amplitude>(amplitude) <stopval>(2.0) <rep_cnt>(25) <min_low>(10) <ign_low>(0) <fac_slope>(0) [output_mean_all/none](none) [output_fraction/none](none) | |
Output an estimate of the noise mean. If the input are <log>-power spectral values (data = sum of log-Rayleigh distribution, lowest distribution equals the noise), then <stopval> is an upper value on the sigma. If the input are <amplitude> values (data = sum of Rayleigh distributions, lowest distribution equals the noise), then <stopval>(*) is a lower limit on the ratio mu/sigma and <fac_slope> is an additional; (*) a non-zero value for <fac_slope> (typical value: 16.0) will result in a variable threshold depending on the slope of the mu/sigma curve. The noise mean is calculated based on the max(<l>,<min_low>) lowest values. The value of <l> is the index of the last value for which the criterion is still met as long as the criterion was not met <rep_cnt> times. The <ign_low> lowest values are ignored in the calculations. Next to the noise mean, also the noise+speech mean and the local fraction of silence can be output (in the form of a tuple per frequency tab). | |
1.8.6