cpsxpch — Converts a pitch-class value into cycles-per-second (Hz) for equal divisions of any interval.
Converts a pitch-class value into cycles-per-second (Hz) for equal divisions of any interval. There is a restriction of no more than 100 equal divisions.
ipch -- Input number of the form 8ve.pc, indicating an 'octave' and which note in the octave.
iequal -- if positive, the number of equal intervals into which the 'octave' is divided. Must be less than or equal to 100. If negative, is the number of a table of frequency multipliers.
irepeat -- Number indicating the interval which is the 'octave.' The integer 2 corresponds to octave divisions, 3 to a twelfth, 4 is two octaves, and so on. This need not be an integer, but must be positive.
ibase -- The frequency which corresponds to pitch 0.0
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Here is an example of the cpsxpch opcode. It uses the file cpsxpch.csd.
Example 89. Example of the cpsxpch 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 ; Audio out Audio in -odac -iadc ;;;RT audio I/O ; For Non-realtime ouput leave only the line below: ; -o cpsxpch.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> ; Initialize the global variables. sr = 44100 kr = 4410 ksmps = 10 nchnls = 1 ; Instrument #1. instr 1 ; Use a normal twelve-tone scale. ipch = 8.02 iequal = 12 irepeat = 2 ibase = 1.02197503906 icps cpsxpch ipch, iequal, irepeat, ibase print icps endin </CsInstruments> <CsScore> ; Play Instrument #1 for one second. i 1 0 1 e </CsScore> </CsoundSynthesizer>
Its output should include lines like this:
instr 1: icps = 293.666
Here is an example of the cpsxpch opcode using a 10.5 ET scale. It uses the file cpsxpch_105et.csd.
Example 90. Example of the cpsxpch opcode using a 10.5 ET scale.
<CsoundSynthesizer> <CsOptions> ; Select audio/midi flags here according to platform ; Audio out Audio in -odac -iadc ;;;RT audio I/O ; For Non-realtime ouput leave only the line below: ; -o cpsxpch_105et.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> ; Initialize the global variables. sr = 44100 kr = 4410 ksmps = 10 nchnls = 1 ; Instrument #1. instr 1 ; Use a 10.5ET scale. ipch = 4.02 iequal = 21 irepeat = 4 ibase = 16.35160062496 icps cpsxpch ipch, iequal, irepeat, ibase print icps endin </CsInstruments> <CsScore> ; Play Instrument #1 for one second. i 1 0 1 e </CsScore> </CsoundSynthesizer>
Its output should include lines like this:
instr 1: icps = 4776.824
Here is an example of the cpsxpch opcode using a Pierce scale centered on middle A. It uses the file cpsxpch_pierce.csd.
Example 91. Example of the cpsxpch opcode using a Pierce scale centered on middle A.
<CsoundSynthesizer> <CsOptions> ; Select audio/midi flags here according to platform ; Audio out Audio in -odac -iadc ;;;RT audio I/O ; For Non-realtime ouput leave only the line below: ; -o cpsxpch_pierce.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> ; Initialize the global variables. sr = 44100 kr = 4410 ksmps = 10 nchnls = 1 ; Instrument #1. instr 1 ; Use a Pierce scale centered on middle A. ipch = 2.02 iequal = 12 irepeat = 3 ibase = 261.62561 icps cpsxpch ipch, iequal, irepeat, ibase print icps endin </CsInstruments> <CsScore> ; Play Instrument #1 for one second. i 1 0 1 e </CsScore> </CsoundSynthesizer>
Its output should include lines like this:
instr 1: icps = 2827.762