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cs190c:addfunc [2008/01/31 17:49] (current)
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 +===== Project 1: Specification of Additional Functions =====
 +
 +**square_sample(freq,​ amp, dur)**
 +
 +This function returns a square wave with frequency freq, amplitude amp,
 +and duration dur (in seconds). The amplitude should be specified
 +with a range of 0 to 1 where 1 represents the maximal amplitude.
 +To obtain the actual amplitude in the sample use the WAVE_MAX value
 +to scale it to an appropriate value.
 +
 +See http://​en.wikipedia.org/​wiki/​Image:​Waveforms.svg for an illustration.
 +----
 +
 +**sawtooth_sample(freq,​ amp, dur)**
 +
 +This function returns a sawtooth wave with frequency freq, amplitude amp,
 +and duration dur (in seconds). The amplitude should be specified
 +with a range of 0 to 1 where 1 represents the maximal amplitude.
 +To obtain the actual amplitude in the sample use the WAVE_MAX value
 +to scale it to an appropriate value.
 +
 +See http://​en.wikipedia.org/​wiki/​Image:​Waveforms.svg for an illustration. ​
 +
 +----
 +
 +**ring_modulate(s1,​ s2)**
 +
 +This function takes two waves and computes their ring modulation.
 +The ring modulation is the product of the two input waves.
 +
 +In order to calculate the ring modulation of the given waves, each
 +wave is first scaled so that the samples range from 0 to 1. Each pair
 +of corresponding sample is multiplied, and then scaled back to the
 +original range of values (hint: use WAVE_MAX).
 +
 +----
 +
 +**just_scale(freq,​ amp, dur, sampler=sin_sample)**
 +
 +This function is essentially the same as the scale in equal
 +temperment, except that the frequency multipliers should be
 +the ones provided in the ratios list.
 +
 +See also http://​thinkzone.wlonk.com/​Music/​12Tone.htm ​
 + 
 +----
 +
 +**partch_scale(freq,​ amp, dur, sampler=sin_sample)**
 +
 +This function produces an ascending partch scale. This scale
 +contains 43 tones which are calculated using the ratios in
 +the ratios list.
 +
 +The scale is not found in classical music, but rather in
 +the electronic music of Harry Partch. Even to most musicians
 +this scale will sound unfamiliar.
 +
 +See also http://​sonic-arts.org/​monzo/​partch/​43lattice.htm ​
 +
 +----
 +
 +**  fade_out(data,​ amount=.1) **
 +
 +This function takes in an array of samples and implements a fading out effect over the last "​amount"​ percent of the samples. ​
 +The scaling function may be any decreasing curve, however a straightforward approach is to use a linear function. It may also
 +be interesting to try this with an exponential function.
 +
 +This function is particularly useful for eliminating the "​clicking"​ between samples generated by the other routines.
  
 
cs190c/addfunc.txt ยท Last modified: 2008/01/31 17:49 (external edit)
 
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