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 Forum index » DIY Hardware and Software » Microcontrollers and Programmable Logic
DSP_G1 voice chip
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State Machine
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Joined: Apr 17, 2006
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Location: New York
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PostPosted: Fri Oct 19, 2018 1:01 pm    Post subject: DSP_G1 voice chip
Subject description: Chip analog modeling synthesizer
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I thought this would be interesting to incorporate into a winter project.

Chip analog modeling synthesizer

Make your own mini MIDI synth with DSP-G1 Voice Chip analog modeling synthesizer by Jan Ostman at DSP Synthesizers. It's a tiny LPC810 chip programmed to read in MIDI streams and make music!

The chip reads TTL level serial MIDI data and outputs sound through a 44.1KHz Delta-Sigma DAC. The synth is a 15-DCO structured as 5-note paraphonic with a 24db lowpass filter with resonance. It also has: AMP ENV, filter ENV and LFO with sine or sample & hold waveform.

If you want to use it with for example Arduino (as we did in our example photo), it can be connected to the ATmega TX port and controlled through a sketch. More chips makes it multitimbral

https://www.adafruit.com/product/2400

LINK to MCU IC:
https://www.nxp.com/products/processors-and-microcontrollers/arm-based-processors-and-mcus/lpc-cortex-m-mcus/lpc800-series-cortex-m0-plus-mcus/low-cost-microcontrollers-mcus-based-on-arm-cortex-m0-plus-cores:LPC81X_LPC83X

Adafruits tutorial on how to get started using this cool little 8 pin ARM M0 Cortex IC:

https://learn.adafruit.com/getting-started-with-the-lpc810/introduction



Enjoy!
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VA1



Joined: Aug 20, 2018
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Location: Nederland

PostPosted: Sat Oct 20, 2018 7:46 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi, does that chip have delta sigma DAC on board ?, dont it need to be buffered ?

If it has all that i am intrested if there is no noise ?,
DSPIC internal delta sigma DAC is to noisey and i like to try something else.

thanks
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State Machine
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Joined: Apr 17, 2006
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Audio files: 24

PostPosted: Sat Oct 20, 2018 9:29 am    Post subject: Reply with quote  Mark this post and the followings unread

The chip does not have a delta sigma DAC inboard. Therefore the audio is produced by a PWM output and then low pass filtered. My bet is it probably will be more noisy than the DSpic solution. In the case of where someone wanted a 15 DCO voice with ADSR, LFO, etc etc.... With MIDI control, then this would be a good chip to use. It may not be suitable for those who wanted to roll their own synthesizer voice or better audio fidelity .

Bill
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