vtablek — Read vectors (from tables -or arrays of vectors).
ixmode - index data mode. The default value is 0.
== 0 index is treated as a raw table location,
== 1 index is normalized (0 to 1).
kinterp - switch beetween interpolated or non-interpolated output. 0 -> non-interpolation , non-zero -> interpolation activated
kndx - Index into f-table, either a positive number range matching the table length (ixmode = 0) or a 0 to 1 range (ixmode != 0).
kfn - table number
kout1...koutN - output vector elements
This opcode is useful in all cases in which one needs to access sets of values associated to unique indexes (for example, multi-channel samples, STFT bin frames, spectral formants, p-field based scores etc.). The number of elements of each vector (length of the vector) is determined by the number of optional arguments on the right (kout1 , kout2, kout3, .... koutN).
vtablek allows the user to switch beetween interpolated or non-interpolated output at k-rate by means of kinterp argument.
vtablek allows also to switch the table number at k-rate (but this is possible only when vector frames of each used table have the same number of elements, otherwise unpredictable results could occurr), as well as to choose indexing style (raw or normalized, see also ixmode argument of table opcode ).
Notice that no wrap nor limit mode is implemented. So, if an index attempt to access to a zone not allocated by the table, Csound will probably crash. However this drawback can be easily avoided by using wrap or limit opcodes applied to indexes before using vtable, in order to correct eventual out-of-range values.
Here is an example of the vtablek opcode. It uses the files vtablek.csd.
Example 512. Example of the vtablek opcode.
<CsoundSynthesizer> <CsOptions> -odac -B441 -b441 </CsOptions> <CsInstruments> sr = 44100 kr = 100 ksmps = 441 nchnls = 2 gkindx init -1 instr 1 kindex init 0 ktrig metro 0.5 if ktrig = 0 goto noevent gkindx = gkindx + 1 noevent: endin instr 2 kout1 init 0 kout2 init 0 kout3 init 0 kout4 init 0 vtablek gkindx, 1, 1, 0, kout1,kout2, kout3, kout4 printk2 kout1 printk2 kout2 printk2 kout3 printk2 kout4 endin </CsInstruments> <CsScore> f 1 0 32 10 1 i 1 0 20 i 2 0 20 </CsScore> </CsoundSynthesizer>