TVSPECTACLE

Time-varying FFT-based delay.

in RTcmix/insts/jg/SPECTACLE

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quick syntax:

TVSPECTACLE(outsk, insk, dur, amp, ringdowndur, fftsize, windowsize, windowtype, overlap[, sigmix, inputchan, pan])

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NOTE: This is an older RTcmix instrument, the newer SPECTACLE2 instrument (with time-varying pfield control) is probably better to use.

Param Field	Parameter	Units	Dynamic	Optional	Notes
p0	output start time	seconds	no	no
p1	input start time	seconds	no	no
p2	input duration	seconds	no	no
p3	amplitude multiplier	relative multiplier of input signal	no	no
p4	ring-down duration	seconds	no	no
p5	FFT length	samples, power of 2, usually 1024	no	no
p6	window length	samples, power of 2, usually FFT length * 2	no	no
p7	window type	0: Hamming, 1: Hanning, 2: Rectangle, 3: Triangle, 4: Blackman, 5: Kaiser	no	no
p8	overlap - how much FFT windows overlap	(any power of 2) 1: no overlap, 2: hopsize=FFTlen/2, 4: hopsize=FFTlen/4, etc.	no	no	2 or 4 is usually fine; 1 is fluttery; the higher the more CPU time
p9	wet/dry mix	0: dry -> 1: wet	no	yes	default: 1
p10	input channel	-	no	yes	default: 0
p11	pan	0-1 stereo; 0.5 is middle	no	yes	default: 0

Because this instrument has not been updated for pfield control, the older makegen control envelope system should be used:

• Function table 1 is the input amplitude, spanning just the input duration.
• Function table 2 is the output amplitude, spanning the entire note, including ring-down duration.
• Function table 3 is the EQ table A (i.e., amplitude scaling of each band), in dB (0 dB means no change, + dB boost, - dB cut).
• Function table 4 is the delay time table A.
• Function table 5 is the delay feedback table A. Values > 1 are dangerous!
• Function table 6 is the EQ table B
• Function table 7 is the delay time table B.
• Function table 8 is the delay feedback table B.
• Function table 9 describes the curve between EQ tables A and B.
• Function table 10 describes the curve between delay time tables A and B.
• Function table 11 describes the curve between delay feedback tables A and B.

Author: John Gibson

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TVSPECTACLE is an FFT-based delay instrument based on the SPECTACLE instrument. The difference is that TVSPECTACLE allows the EQ, delay and feedback parameters to vary over time.

NOTE: This is an older RTcmix instrument, the newer SPECTACLE2 instrument is probably better to use. The parameter time-variation can be accomplished using the pfield-enabled capabilities of SPECTACLE2.

Usage Notes

See the SPECTACLE Usage Notes of an explanation of the basic parameters of this instrument.

There are two ‘sets’ of makegen function tables used to specify ‘endpoints’ for the EQ params (p3 and p6), the delay times for each FFT bin (p4 and p7) and the feedback values for each FFT bin (p5 and p8). Function tables listed in p9, p10 and p11 then specify the envelope trajectory between these two sets. When the envelope in the function table is at “0”, values from the corresponding first set (p4, p5, p6) will be used. When the control envelope is at “1”, values from the second set (p7, p8, p9) will be used. Intermediate control values will interpolate between the endpoint table values.

TVSPECTACLE can produce either mono or stereo output.

There are no sample scorefiles.

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See Also

CONVOLVE1, LPCPLAY, PVOC, SPECTACLE, SPECTACLE2, SPECTEQ, SPECTEQ2, VOCODE2, VOCODE3, VOCODESYNTH