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 files cpsxpch.orc and cpsxpch.sco.
Example 82. 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 */
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 files cpsxpch_105et.orc and cpsxpch_105et.sco.
Example 83. 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 */
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 files cpsxpch_pierce.orc and cpsxpch_pierce.sco.
Example 84. 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 */
Its output should include lines like this:
instr 1: icps = 2827.762