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an open-source digital signal processing and sound synthesis language
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DescriptionThe units oscil, and oscili, are, respectively, a simple table-lookup oscillator and an interpolating version of the same. The others osciln and oscilni are designed for frequency modulation and will accept negative sampling incre- ments. The arguments amp and si are the amplitude and sampling increments, The argument farray is the address of the table from which to fetch values. In case this table was created with a makegen command a call to floc will return this address. The phs argument is passed as an address since it must be updated continuously by the oscil call. Thus phs should be declared as float in the calling routine, and passed to oscil as &phs. Note that if it is declared as *phs in the calling routine space will not actually be allocated for it and an error will result. The various oscils return floating point values and are declared as floats in the above mentioned include file. The argument len is the size of the table passed to oscil and if this table was created by a call to makegen the routine fsize will find you this quantity.
See Alsofloc, fsize.
BugsThese units dutifully keep the phase pointer within range by subtracting the length from the phase until in range, so if the phase pointer is uninitialized, and perhaps huge, several years may pass while .123456e+38 is reduced to less than 512, for example. Also, as mentioned above make sure that phs is declared as float phs; not float *phs; and passed as &phs.