Pvoc implements signal reconstruction using an fft-based phase vocoder. If ifn = 0, control is derived internally from a previous tableseg or tablexseg unit. Ifn (optional) – optional function table containing control information for vpvoc.
#Soundhack pvoc how to#
See examples under pvadd for how to use amplitude gating. Values between 0 and 1 will map accordingly to points along the function table. An amplitude of 0 will map to the first point in the function. The maximum amplitude will map to the last point in the function. This value is then used create normalized amplitudes as indeces into the stored function igatefn. First, the amplitudes of all of the bins in all of the frames in the entire analysis file are compared to determine the maximum amplitude value.
If igatefn is greater than 0 the amplitudes of each bin will be scaled by igatefn through a simple mapping process. Igatefn (optional) – the number of a stored function which will be applied to the amplitudes of the analysis bins before resynthesis takes place. See examples under pvadd for how to use spectral extraction. The default values for iextractmode and ifreqlim are 0, in which case a simple resynthesis will be done. A value of 2 for iextractmode will cause pvadd to synthesize only those components where the frequency difference between frames is less than ifreqlim. A value for iextractmode of 1 will cause pvadd to synthesize only those components where the frequency difference between analysis frames is greater than ifreqlim. Iextractmode (optional) – determines if spectral extraction will be carried out and if so whether components that have changes in frequency below ifreqlim or above ifreqlim will be discarded. Ispecwp (optional) – if non-zero, attempts to preserve the spectral envelope while its frequency content is varied by kfmod. – durations for tableseg and tablexseg, during which interpolation from one table to the next will take place. ifn1, ifn2, and so on, must be the same size. – function table numbers for tableseg and tablexseg. Memory usage depends on the size of the files involved, which are read and held entirely in memory during computation but are shared by multiple calls (see also lpread). pvoc control contains breakpoint amplitude and frequency envelope values organized for fft resynthesis.
If not fullpath, the file is sought first in the current directory, then in the one given by the environment variable SADIR (if defined).
#Soundhack pvoc full#
An integer denotes the suffix of a file pvoc.m a character-string (in double quotes) gives a filename, optionally a full pathname. Ifilcod – integer or character-string denoting a control-file derived from analysis of an audio signal. The uses of these are described below under vpvoc. The result is a new function table passed internally to any following vpvoc which occurs before a subsequent tableseg or tablexseg (much like lpread/ lpreson pairs work). Tableseg and tablexseg are like linseg and expseg but interpolate between values in a stored function tables. Output of pvoc and vpvoc is an additive set of individually controlled sinusoids, using phase vocoder resynthesis. Signal Generators: STFT Resynthesis (Vocoding)Īr pvoc ktimpnt, kfmod, ifilcodĪr vpvoc ktimpnt, kfmod, ifile]
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