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 files cpsxpch.orc and cpsxpch.sco.
Example 1. Example of the cpsxpch opcode.
/* cpsxpch.orc */
; 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
/* cpsxpch.orc */
/* cpsxpch.sco */
; Play Instrument #1 for one second.
i 1 0 1
e
/* cpsxpch.sco */
instr 1: icps = 293.666
Here is an example of the cpsxpch opcode using a 10.5 ET scale. It uses the files cpsxpch_105et.orc and cpsxpch_105et.sco.
Example 2. Example of the cpsxpch opcode using a 10.5 ET scale.
/* cpsxpch_105et.orc */
; 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
/* cpsxpch_105et.orc */
/* cpsxpch_105et.sco */
; Play Instrument #1 for one second.
i 1 0 1
e
/* cpsxpch_105et.sco */
instr 1: icps = 4776.824
Here is an example of the cpsxpch opcode using a Pierce scale centered on middle A. It uses the files cpsxpch_pierce.orc and cpsxpch_pierce.sco.
Example 3. Example of the cpsxpch opcode using a Pierce scale centered on middle A.
/* cpsxpch_pierce.orc */
; 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
/* cpsxpch_pierce.orc */
/* cpsxpch_pierce.sco */
; Play Instrument #1 for one second.
i 1 0 1
e
/* cpsxpch_pierce.sco */
instr 1: icps = 2827.762