28 lines
943 B
Plaintext
28 lines
943 B
Plaintext
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;nyquist plug-in
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;version 4
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;type generate
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;categories "http://lv2plug.in/ns/lv2core#GeneratorPlugin"
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;preview linear
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;name "Reverse Chirp..."
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;action "Generating Chirp..."
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;author "dm"
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;control crv-param "Curve" float "" 5 0 10
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;control top-freq "Top Frequency (Hz)" float "" 6000 1 22050
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;control duration "Length (Seconds)" float-text "" 0.05 0 5
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;control tbl-choice "Waveform" choice "Sine,Sawtooth,Triangle,Square" 0
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;tone which lingers at high frequencies before chirping downward to zero
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;bandpass filter is applied to emphasize frequency halfway down
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(let* ((passq 5.0)
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(epsilon (expt 0.5 crv-param))
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(tbl-form (case tbl-choice
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(0 *sine-table*)
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(1 *saw-table*)
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(2 (maketable (pwlv -1 0.5 -1 0.501 1 1.0 1)))
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(3 *tri-table*))))
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(stretch-abs duration
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(bandpass2
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(hzosc (scale (- top-freq) (diff (pwev epsilon 1 1) 1))
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tbl-form 0.0)
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(/ top-freq 2.0) passq)))
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