deltapx
deltapx — Read from or write to a delay line with interpolation.
Description
deltapx is similar to deltapi or deltap3 However, it allows higher quality interpolation. This opcode can read from and write to a delayr/delayw delay line with interpolation.
Initialization
iwsize -- interpolation window size in samples. Allowed values are integer multiplies of 4 in the range 4 to 1024. iwsize = 4 uses cubic interpolation. Increasing iwsize improves sound quality at the expense of CPU usage, and minimum delay time.
Performance
aout -- Output signal.
adel -- Delay time in seconds.
a1 delayr idlr deltapxw a2, adl1, iws1 a3 deltapx adl2, iws2 deltapxw a4, adl3, iws3 delayw a5
Minimum and maximum delay times:
idlr >= 1/kr Delay line length
adl1 >= (iws1/2)/sr Write before read
adl1 <= idlr - (1 + iws1/2)/sr (allows shorter delays)
adl2 >= 1/kr + (iws2/2)/sr Read time
adl2 <= idlr - (1 + iws2/2)/sr
adl2 >= adl1 + (iws1 + iws2) / (2*sr)
adl2 >= 1/kr + adl3 + (iws2 + iws3) / (2*sr)
adl3 >= (iws3/2)/sr Write after read
adl3 <= idlr - (1 + iws3/2)/sr (allows feedback)
![[Note]](images/note.png)
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Note |
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Window sizes for opcodes other than deltapx are: deltap, deltapn: 1, deltapi: 2 (linear), deltap3: 4 (cubic) |
Examples
Here is an example of the deltapx opcode. Play deltapx.csd
Example 230. Example of the deltapx opcode.
See the sections Real-time Audio and Command Line Flags for more information on using command line flags.
<CsoundSynthesizer> <CsOptions> ; Select audio/midi flags here according to platform -odac ;;;RT audio out ;-iadc ;;;uncomment -iadc if RT audio input is needed too ; For Non-realtime ouput leave only the line below: ; -o deltapx.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 44100 ksmps = 32 nchnls = 2 0dbfs = 1 instr 1 a1 phasor 300 a1 = a1 - 0.5 a_ delayr 1 adel phasor 4 adel = sin(2 * 3.14159265 * adel) * 0.01 + 0.2 deltapxw a1, adel, 32 adel phasor 2 adel = sin(2 * 3.14159265 * adel) * 0.01 + 0.2 deltapxw a1, adel, 32 adel = 0.3 a2 deltapx adel, 32 a1 = 0 delayw a1 outs a2*.7, a2*.7 endin </CsInstruments> <CsScore> i1 0 5 e </CsScore> </CsoundSynthesizer>