|RESPITE: The CASA Toolkit Page: Documentation: Block Library Index:GlottalWave|
GlottalWave is a periodic signal generator block that can generate a rectilinear approximation to a series of glottal pulses. There are 9 controlling parameters: SAMPLE_RATE, DURATION, FREQ, AMP, initial PHASE, ATTACK, SUSTAIN, DECAY and CLOSED.
SAMPLE_RATE is in units of samples per second, DURATION is measured in seconds, and FREQ in cycles per second. The glottal wave has maximum value of +AMP and a resting value of 0. The initial PHASE is specified in radians where the one complete cycle of the wave has 2 Pi radians (see diagram below).
The parameters ATTACK, SUSTAIN, DECAY and CLOSED specify the relative duration of each stage of the glottal cycle. If they are arranged to sum to 100.0 then each will represent the percentage of the cycle spent in that stage.
|Inputs||Meaning||Sample||1-D frame||2-D frame|
|SAMPLE_RATE||Float||-||Number of samples per second|
|DURATION||Float||-||Duration in seconds of signal to generate|
|FREQ||Float||-||The sawtooth wave frequency|
|AMP||Float||1.0||The sawtooth wave amplitude|
|PHASE||Float||0.0||The initial phase in radians|
|ATTACK||Float||-||Attack stage duration as percentage of cycle|
|SUSTAIN||Float||-||Sustain stage duration as percentage of cycle|
|DECAY||Float||-||Decay stage duration as percentage of cycle|
|CLOSED||Float||-||Closed stage duration as percentage of cycle|