good sources for gen dsp code online?

Hi Boys and Girls,

Got it I think coefficients b must always be below 1 for stability. I hope. Please correct me if I am wrong.

Thanks people,

MDA

Triangle = multiply (I'm guessing this is historically related to the use of op-amps). The negative sign indicates inversion.

The coefficients don't necessarily have to be less than one--that depends on the design of the filter. In a onepole, yes, but not in some biquad implementations. (the so-called "triangle of stability") For example in the highpass coefficients on the page below, there are some coefficients that could individually exceed +/-1.

http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt

Hi Peter,

When you say inversion you mean phase right (180° kinda)? Would this need specifically implementing with [-] operators or just as a result of the multiplication being below 0?

I get nothing out of the patch. Zip. It may just be settings of the coefficients, don't know.

I've tried to paste the patch as text but I can't seem to get it to work. Where I'm at so far is attached if you have time to have a look and tell me the obvious errors I've made.

Thanks. :-)

can anyone kindly relink the block diagram pdf?

All the current dropboxes in this thread give a 404, Thanks.

I believe the synthcore library is now stable, although I haven't been able to test on Max8 yet, for Max7 it now has 1,500 users and so far, no problems have been reported with the 2.1 version. The available functions are as follows. Link at end.

// UTILITY FUNCTION SIGNATURES *********************************** //
out = qsin(in); // quick transcendental calcs
out = qcos(in);
out = qtan(in);
gain= db2a(db); // quick level conversion
db = a2dB(gain);
out = smoothermsecs(in);// predelay smoother, 0~0.24
out = smoother1(val){ // smoothing over ~46 clock cycles
out = smoother2(val); // smoothing over ~400 clock cycles
out = smoother3(val); // slowest smoothing for long delay line times
out = pan3db(x); // pan with -3dB center
out = powerfade(in1L, i2L, in1R, in2R, x); // ganged fader with exp crossfade
out = stereomix(in1L, in2L, in1R, in2R, x);// stereo ganged mix
out = ramp(inc); // quickest ramp generator, 0 to 1 over inc cycles
out = ramptrig(msecs, trg);// triggered 1-shot ramp, time in msecs
// OSCILLATOR FUNCTION SIGNATURES******************************** //
out = parasine(inc); // a sine osc approximation. with much lower cpu
out = triwave(ramp, width); // variable tri/saw with simple AA
out = karplus(impulse, P, dampen); // Karplus oscillator
out = karplusd(impulse, P, diffuse); // diffused Karplus
out = karplusm(impulse, fc, mod); // mod Karplus
out = noiseosc(type, p, fc, q); //lp/bp/hp/notch white/pink noise
out = waveset(sel, width, ramp, wavesets); // waveset oscillator, crosswave interp.
out = eptr3x(ramp, inc, width, eptr); // 3x-oversampled AA Pulse, table-based calcs
out = eptrx(ramp, inc, width, eptr); //antialiasing slope for pulse osc
out = lfo(sel, Fc, wid, snc_en, trg); // basic LFO
out = lfopoly(sel, Fc, sprd, sprdlvl, sprdtype, wid, sncen, trg); // LFO, voice spread
// ENVELOPES FUNCTION SIGNATURES ********************************** //
out = adsr(gate,predelay,att,dec,sus,susn,rel); basic ADSR
out = adsrloop(trg,gate,predelay,att,dec,sus,susn,rel,mode);// ADSR with loop mode
out = padsrloop(trg,gate,pre1, pre2,att,dec,sus,rel,mode); // PADSR, loop & predelay
out = adbdsrloop(trg,gate,predelay,att,dec1,brk,dec2,sus,rel,mode); // ADBDSR, loop
out = padbdsrloop)trg,gate,pre1,pre2,att,dec1,brk,dec2,sus,rel,mode); // PADBDSR. predelay & loop
// FILTER FUNCTIONS ----------------------------------------------------
out = lo1pole1 (in, P); // 6db lowpass filter
out = hi1pole1(in, P); // 6db highpass filter
out1, out2 = lo1pole2 (in1, in2, P); // stereo 6db lowpass filter
out1, out2 = hi1pole2(in1, in2, P); // stereo 6db highpass filter
out = loshelf(in, P, dB); // 12dB/oct lo shelf, +/-12dB range
out = hishelf(in, P, dB); // 12dB/oct hi shelf, +/-12dB range
out = loshelf2(in, P, dB); // 24dB/oct lo shelf, +/-12dB range
out = hishelf2(in, P, dB); // 24dB/oct hi shelf, +/-12dB range
out1, out2 = hishelfStereo(in1, in2, P, dB); // stereo hishelf
out1, out2 = loshelfStereo(in1, in2, P dB); //stereo lowshelf
out = biquad0 (in, a0, a1, a2, b1, b2); // biquad direct form 1
out = biquad (in, a0, a1, a2, b1, b2); // biquad optimized form 2
out = biquadresonant(in, P, Q); //resonant
out = biquadgainresonant(in, P, Q, gain); //gain resonant
out = biquadlo (in, Fc, Q); // biquad lowpass, simple
out = biquadlp1 (in, Fc, Q); // tuned lowpass
out = biquadlo2 (in, P, Q); // biquad lowpass, MIDI pitch Fc,
out = biquadlo3 (in, P, Q); // biquad lowpass, qain-limiting
out = biquadband (in, Fc, Q); // biquad bandpass, simple
out = biquadbp1 (in, Fc, Q); // tuned bandpass
out = biquadband2(in, P, Q); // biquad bandpass, MIDI pitch Fc,
out = biquadband3(in, P, Q); // biquad bandpass, gain limiting
out = biquadband4(in, P, Q); // biquad bandpass, unity gain
out = biquadbandgain(in, Fc, Q, gain); // biquad bandpass gain
out = biquadhi (in, Fc, Q); // biquad highpass, simple
out = biquadhp1 (in, Fc, Q); // tuned highpass
out = biquadhi2 (in, P, Q); // biquad highpass, MIDI pitch Fc,
out = biquadhi3 (in, P, Q); // biquad highpass, gain limiting
out = biquadhigain(P, Q, gain); // biquad gain hipass
out = biquadnotch(in, Fc, Q); // biquad notch, somple
out = biquadgainbandstop(in, P, Q, gain); //gain gandstop
out = biquadbandstop(in, P, Q); // biquad bandstop
out = biquadpeaknotch(in, Fc, Q, gain); // biquad peak/notch
out = biquadallpass(in, P, Q); // biquad allpass
out = biquadgainallpass(in, P, Q, gain); // gain allpass
val = biquadamp (w, a0, a1, a2, b1, b2); // biquad gain @ specfic fc
out = filt5d(in, P, Q, type, poles, drive); // 3x-oversampled 5d filter
out1, out2, out3 = upsample(in); // 3x upsampling with sinc coefficients
out = downsample(out1, out2, out3); // 3x downsampling with sinc coefficients
out = comb(input, delay, feedback, lvl); // feedforward comb filter
// EFFECTS FUNCTION SIGNATURES ************************************* //
out1, out2 = ping0(L, R, delayL, delayR, cross, feedback); // simple stereo delay
out1, out2 = ping1(L, R, delayL, delayR, cross, feedback,
locut, hicut); // stereo delay, 1pole filter
out1, out2 = ping3(L, R, delayL, delayR, cross, feedback,
loP, loG, midP, midG, midQ, hiP, hiG); // stereo delay with 3band EQ
out1, out2 = chorus(in1, in2, del, deep, sprd, mix); // dual quad-band chorus
out = diffdelay(in, delay, diff); // basic diffusion delay
out = diffdelSmall(in, depth, time); // small diffusion delay
out = diffdelBig(in, depth, time); // large diffusion delay
out = earlydelF(in, Dffs, size, ha1, hb0, hb1, la1, lb0, lb1); // biquad diff delay
out = tankLeft(in, damp, decay); // left late reflections
out = tankRight(in, damp, decay); // right late reflections
out1, out2 = reverb(in1, in2, pre, cut, damp, decay, lvl);//acoustic reverb
out1, out2 = rev66(in1, in2, pre, cut, latemix, size, time, inc,
spin, rndm, hishelf, loshelf); // production-quality reverb
out1, out2 = limit(in1, in2, lvl, window, attlo, atthi, rello, relhi); // stereo limiter
// ***************************************************************** //

https://www.yofiel.com/downloads/max-msp-downloads/synthcore2-bundle

Yofiel's gen~ Synthcore 2.1 library shall remain $15 until Tuesday June 12th. Synhcore v2.2 will include a phase-banked vocoder. Top-level structure of Yofiel's Bowie phase-banked AV vocoder is illustrated below (now in alpha stage). By default, Bowie provides up to 32 detuned voices with a common dual quad-band vocoder for each voice. Changes in vocoder settings alter the video frame pointer. With felicitations to Berlin on 2018 Memorial Day weekend. And with a nod to Reaktor 6 in vst~. Hope you enjoy the free instruments for MacOS Yosemite, High Sierra, and Windows 10 on https://www.yofiel.com. Top-down design of first to third levels is below. Enjoy :)