ephasor — produces two outputs: a periodic phase signal and a periodic exponential decaying signal.
This opcode produces two outputs: a periodic phase signal (like the phasor opcode), and a periodic exponential decaying signal. The latter is synchronised to the former, starting at 1 and then decreasing at the same time as the phase signal increases from 0 to 1. The rate of exponential decay can be controlled by the second parameter.
kfreq - the rate at which the phase and exponential signals are generated
kR - a parameter controlling the decay rate of the exponential signal, 0 < kR < 1. Lower values produce faster decays.
Here is an example of the ephasor opcode. It uses the file ephasor.csd.
Example 268. Example of the ephasor opcode.
See the sections Real-time Audio and Command Line Flags for more information on using command line flags.
<CsoundSynthesizer> <CsOptions> </CsOptions> <CsInstruments> sr=44100 ksmps=64 nchnls=2 0dbfs = 1 instr 1 iamp = p4 ifr = p5 kfr expon ifr,p3,2*ifr kfc expon 2000,p3, 4000 kq = 10 kbw = kfc/kq kR = 1 - $M_PI*(kbw/sr) k1 = kfc/kfr kn = int(k1) k1 = k1 - kn amod,aph ephasor kfr,kR aosc1 table aph*kn,-1,1,0,1 aosc2 table aph*(kn+1),-1,1,0,1 asig = iamp*(aosc1*(1 - k1) + aosc2*k1)*amod outs asig, asig endin </CsInstruments> <CsScore> i1 0 10 0.5 220 e </CsScore> </CsoundSynthesizer>