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 Forum index » DIY Hardware and Software » Microcontrollers and Programmable Logic
VitaSynth: Modular platform based on FPGA.
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UA3MQJ



Joined: Dec 04, 2014
Posts: 12
Location: Russia

PostPosted: Fri Dec 05, 2014 4:10 am    Post subject: VitaSynth: Modular platform based on FPGA. Reply with quote  Mark this post and the followings unread

Hi!
I'm launching a hardware platform project for creating digital and analog synthesizers. Each project consists of modules, which one can use as blocks to create the required synthesizer (mono synth, poly synth, organ, etc). In my project each module is created hardwarily within the chip FPGA (digital Field Programmable Array).
I've created enough blocks to assemble a simple synthesizer (MIDI_IN, DCO, ADSR, DCA).
I do not use external(or internal) MCU. All work on the FPGA.
Plan to create and internal blocks for FPGA and external analog blocks, controled from the FPGA (VCF, VCA, PAN, MATRIX).

Already done modules:
- MIDI_IN. Scheme and module. Already supports MIDI messages: channel messages Note ON, Note OFF, Polyphonic Key Pressure, Control Change, Program Change, Channel Pressure, Pitch Wheel Change. SysEx not support yet.
- DCO. Based on DDS. Parameters: a 32-bit accumulator(result) and Adder.
- Note2DDS. Note (0..127) to dds32 adder converter. Uses a table and a little math.
- Note+pitch2DDS. Note (0..127) + pitch (0..8192) to dds32 adder converter. I spent a lot of mathematical experiments (direct calculation, polynomial approximation). In the end, decided to use a table for integer values of notes and linear interpolation between them on the pitch value. Range -1200.. +1199 cents (+-1 octave) when pitch 0...8192.
- DCA. Didital VCA. Calculated within the FPGA. Signal list: in_sig(8bit), in_control(8bit), result(16bit). The formula is simple: result = in_sig * in_control.
- ADSR. Envelope generator (aplha version with some bugs). Input A, D, S, R - 32bit, OUT - 32 bit. To convert the СС values 0 ... 127 in a 32-bit value is used converter lin2exp. With a maximum of attack, the rise time of 12 seconds.
- Audio OUT. I decided not to output sound through one DAC for all voices, but each voice individually. Now I use PWM DAC for each voice. The sampling frequency of 195 kHz, resolution 8 bits. I'm working on modules with the best parameters (deltasigma etc). However, if not to use the digital VCA, the 8 bits for the generation of pure tones must be enough dynamic range (nearly 60 dB). After analog filtering VCF and VCA singhal will already have a normal shape and dinamic range.
- VCA. Analog VCA based on the analog switch. Controlled by PWM signals from the FPGA. Is in the state of testing and debugging.
- VCF. Analog VCF based on the analog switched capacitors. Controlled by frequency signal from the FPGA. Is in the state of development scheme.
- etc...

I've created enough blocks to assemble a simple synthesizer (MIDI_IN, DCO, ADSR, DCA).

As a development platform, I chose Altera. HDL language - Verilog. In my case it's Cyclone 4. But I have to go any other FPGA, which can be fit logic. Text modules simple and is not tied to Altera, so maybe it will work on Xilinx(I do not have the possibility to check).

The idea is to take devboard and attach it to the synth module. Recommended FPGA with the number of cells is not less than 4000 and a hardware multiplier (Cyclone 1-4 series).

For the development board synthesizer I use a homemade board for wire wrapping, wire and special tools.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

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Tools:
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Synthesizer has no external controls. All control is for MIDI commands. To do this, i make VSTI plugin based Ctrlr.com.

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Links:
Project page in Russian
Page source and a small documentation in English
A few examples of the sounds (sorry, I'm not a musician):
SAW 220 Hz
Square 440 Hz
Stereo Noise
SAW 200 Hz and SAW 1 Hz to DCA (Digital VCA)
Mixer test (poliphonic sound)
Pitch Wheel Test

I would like to hear your suggestions for the development of the project.
Thanks! Alex.

ps. The project needs your help:
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engineer



Joined: Mar 31, 2014
Posts: 11
Location: Frankfurt / Germay

PostPosted: Thu May 28, 2015 12:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

Looks interesting.

did you checkout mine:

http://www.96khz.org/doc/vasynthesismicrowavext.htm
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UA3MQJ



Joined: Dec 04, 2014
Posts: 12
Location: Russia

PostPosted: Tue Jun 02, 2015 12:29 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks!

New demos:

https://soundcloud.com/vitasynth/vitasynth-drum-test-samples-bass-snar-of-tr606

https://soundcloud.com/vitasynth/vitasynth-lfo-vca-test

https://soundcloud.com/vitasynth/vitasynth-lfo-fm-test

Photos
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Blue Hell
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Joined: Apr 03, 2004
Posts: 23190
Location: The Netherlands, Enschede
Audio files: 251
G2 patch files: 320

PostPosted: Tue Jun 09, 2015 6:29 am    Post subject: Reply with quote  Mark this post and the followings unread

Interesting project!

And nice to see someone still using wire wrapping :-)

Too bad I cannot read Russian.

_________________
Jan
also .. could someone please turn down the thermostat a bit.
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UA3MQJ



Joined: Dec 04, 2014
Posts: 12
Location: Russia

PostPosted: Tue Jun 09, 2015 6:38 am    Post subject: Reply with quote  Mark this post and the followings unread

Blue Hell wrote:
Interesting project!

And nice to see someone still using wire wrapping Smile

Too bad I cannot read Russian.

Thanks!
My english is very bad.

There is little information in English on GITHUB
https://github.com/UA3MQJ/fpga-synth/wiki
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Nardu



Joined: Feb 28, 2011
Posts: 62
Location: Braila, Romania

PostPosted: Sun Jun 14, 2015 9:02 am    Post subject: Reply with quote  Mark this post and the followings unread

Blue Hell wrote:
......
Too bad I cannot read Russian.

Use Google Chrome browser for automate translation or
https://goo.gl/YFS6FW

_________________
http://nardusynth.blogspot.ro/
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UA3MQJ



Joined: Dec 04, 2014
Posts: 12
Location: Russia

PostPosted: Wed Jul 29, 2015 6:42 am    Post subject: Reply with quote  Mark this post and the followings unread

Test LPF 20 KHz for PWM DAC. Several waveforms, Pitch, LFO for VCA & VCO.
https://www.youtube.com/watch?v=ZbAbOceVD2E
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UA3MQJ



Joined: Dec 04, 2014
Posts: 12
Location: Russia

PostPosted: Thu Sep 17, 2015 9:19 am    Post subject: Reply with quote  Mark this post and the followings unread

I try use FPGA for 128 poly Organ. Waveform - square.

Day 1 - one register.

https://soundcloud.com/vitasynth/organ-1square-bwv-5253
https://soundcloud.com/vitasynth/organ-1square-classic
https://soundcloud.com/vitasynth/vitasynth-organ-1square-bach
https://soundcloud.com/vitasynth/vitasynth-organ-1square-bach-2

Day 2 - registers: 16'', 8'', 4'', 2''

https://soundcloud.com/vitasynth/organ-4-tokkata
https://www.youtube.com/watch?v=YpNmjoyXQRA

PS. Over 1900 macrocells in Altera Cyclone.

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UA3MQJ



Joined: Dec 04, 2014
Posts: 12
Location: Russia

PostPosted: Wed Oct 28, 2015 7:37 am    Post subject: Yamaha YM2149f Reply with quote  Mark this post and the followings unread

Im connect sound chip Yamaha YM2149f to FPGA.
YM2149f - is more popular in Russia clone of AY-3-8910 (General Instruments).
This MC is used in the computer ZX Spectrum 48k or highter. Also it was used in gaming arcade machines.
This is not FM chip! Chiptune! 8 bit sound!
More info --> https://en.wikipedia.org/wiki/General_Instrument_AY-3-8910

My sketch of the internal structure of the chip

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My MC im mine in old pcb:
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It is also necessary to make an additional frequency generator at 1.75 MHz.

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Connect FPGA <-> YM2149f

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The hardware part is ready. The theoretical part of the program is also studied. It remains only to programming.

So will sound channel of percussion instruments.
https://www.youtube.com/watch?v=cNuJZH2G-00
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UA3MQJ



Joined: Dec 04, 2014
Posts: 12
Location: Russia

PostPosted: Sat Oct 31, 2015 4:04 pm    Post subject: Reply with quote  Mark this post and the followings unread

Made while only pure tones without ADSR

https://soundcloud.com/vitasynth/vitasynth-yamaha-ym2149f-bwv525-3
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UA3MQJ



Joined: Dec 04, 2014
Posts: 12
Location: Russia

PostPosted: Sun Nov 01, 2015 10:13 am    Post subject: Reply with quote  Mark this post and the followings unread

With ADSR

https://soundcloud.com/vitasynth/vitasynth-yamaha-ym2149f-lilium
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UA3MQJ



Joined: Dec 04, 2014
Posts: 12
Location: Russia

PostPosted: Sat Nov 14, 2015 5:56 am    Post subject: Reply with quote  Mark this post and the followings unread

With internal Envelope Generator

https://soundcloud.com/vitasynth/vitasynth-yamaha-ym2149f-hardware-envelope-gen
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UA3MQJ



Joined: Dec 04, 2014
Posts: 12
Location: Russia

PostPosted: Thu Mar 03, 2016 12:49 pm    Post subject: Reply with quote  Mark this post and the followings unread

I use I2S DAC for output signal waveform to analog.

TDA1543 VS WM8716

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TDA1543 - 195 KHz - SAW 1000 Hz
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WM8716 - 195 KHz - SAW 1000 Hz - with oversampling 128x
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The filter based on SVF and switched capacitors was not working.
The main problem in the analog keys 4066. For work i need the power bipolar and bipolar control. I have tried several schemes of converters TTL to BIPOLAR. The best results were obtained with this scheme.

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But sheme is not stability. Not allowed an intermediate state of the circuit, or burn out the transistors. At high frequency, the transistors do not have work in switch mode, the keys stop working as switch and overheat.

When all problems are solved, it still does not work because of the crosstalk in 4066.

To solve this problem i search keys dg411 witch bipolar signal power and ttl power for TTL switching of keys.

Also a more simple solution to create a filter, the filter is the use of SVF on integrated IC - MF10ccn.

https://soundcloud.com/vitasynth/vitasound-dco-i2s-dac-vcf-mf10ccn
http://www.youtube.com/watch?v=-cE9PZ33cfg
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