KVR Audio

janostman · Post by **janostman** » Tue Apr 29, 2014 12:40 pm

I'm now selling the preprogrammed DSP chip from the dsp-G1 synth.
5 voice, 3 DCO, 24db DCF, 1 LFO and 2 ENV.

The 8-pin DIP chip only requires 3.3v, 2 capacitors and a resistor to operate.
115Kbaud TTL-serial input for control and an audio line output.

Stick it to an Arduino or anything with a serial port to build your own dsp-synth.

You can find it here: http://igg.me/at/dsp-G1

GaryG · Post by **GaryG** » Wed May 07, 2014 12:22 pm

That's neat, I can think of a few applications for a chip like that.

wikter · Post by **wikter** » Sun Jun 29, 2014 12:38 am

Anyone got one of these??

janostman · Post by **janostman** » Wed Aug 13, 2014 8:48 am

It can now be bought here:

http://www.dspsynth.eu

/Jan

janostman · Post by **janostman** » Mon Aug 25, 2014 8:37 pm

The chip is very easy to use with it's TTL-MIDI input and 44.1KHz 16-bit delta-sigma audio output.

It's a 15 DCO design, structured as 5-voices with 3-DCO each, 24dB resonant LPF, 2 ENV's and 1 LFO.

It features 19 MIDI-CC controlled parameters.

I'm currently designing an Arduino shield with a built in control knob surface and even an analog 5v interface for use with analog gear.

It won't hurt checking it out and it does sound great.

http://www.youtube.com/watch?v=9JRRHPEwaV0

http://www.youtube.com/watch?v=w-IUmPD-LuI

http://www.youtube.com/watch?v=dLucvhlYfVU

dsp-G1 kit.jpg

dsp-G1 schematic.jpg

dsp struct.jpg

This is the MIDI-CC parameter list:

CUTOFF = CC#74
RESONANCE = CC#71
FILTER A = CC#82
FILTER D = CC#83
FILTER S = CC#28
FILTER R = CC#29
FILTER ENV M = CC#81
FILTER LFO M = CC#01

WAVEFORM = CC#76
WRAP = CC#04
RANGE = CC#21
DETUNE = CC#93
OSCENV A = CC#73
OSCENV D = CC#75
OSCENV S = CC#31
OSCENV R = CC#72

MASTERVOL = CC#07
LFORATE = CC#16
LFOWAVE = CC#20

You can front it with an ATmega chip or an Arduino and the parameters can be controlled by analog voltages compatible with analog sequencers and CV/Gate.

janostman · Post by **janostman** » Tue Aug 26, 2014 8:04 pm

This the dsp-Gshield that I'm designing.

Just about the coolest shield you can stick into an Arduino board at the moment.

It has the dsp-G1 chip with MIDI connected to the Arduino TX-pin and a 12-knob control surface right on the shield.

Even better, it has a 5v analog bus for the parameters + CV/Gate for the note input.

If your into modular, this one is your friend and don't need MIDI.

But it needs one Arduino Uno to host it.

Gshield proto2.jpg

janostman · Post by **janostman** » Fri Sep 19, 2014 10:05 pm

Here is the first technical review of the dsp-G1 synth chip.
It is written by a customer and he does point out some weak points.

http://mutable-instruments.net/forum/di ... ler-too/p2

Buy the dsp-G1 DSP chip for DIY projects