dsp synth on the LPC-810

dsp synth on the LPC-810#171944

By janostman - Fri Jun 13, 2014 1:47 pm

- Fri Jun 13, 2014 1:47 pm #171944

I took the LPC-810 and wrote a MIDI based dsp synthesizer on it.

44.1KHz/16-bit PCM audio with sigma-delta DAC.
15 DCO analog modeling synth with 24db resonant lowpass filter.

It's at http://igg.me/at/dsp-G1

SCH dsp-G1.jpg

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Re: dsp synth on the LPC-810#171945

By janostman - Fri Jun 13, 2014 2:26 pm

- Fri Jun 13, 2014 2:26 pm #171945

Yes, I tried it on the ATmega and it works but there isn't enough horsepower to make it hifi.

No, It doesn't use wavetables. All waveforms are algorithmic.

Yes, it uses a sigma-delta DAC, 16-bits/44.1KHz on a digital pin and not PWM.

No, it doesn't have analog inputs so the boxed synth uses an Arduino Pro Micro to scan the knobs.

Yes, without the knobs the whole synth fits inside the MIDI-plug and uses phantom power

Re: dsp synth on the LPC-810#171961

By janostman - Sun Jun 15, 2014 4:44 am

- Sun Jun 15, 2014 4:44 am #171961

Got it featured at Hackaday.

http://hackaday.com/2014/06/14/an-arm-b ... ing-synth/

Re: dsp synth on the LPC-810#172026

By janostman - Tue Jun 17, 2014 12:53 pm

- Tue Jun 17, 2014 12:53 pm #172026

The NXP LPC-8xx just got to be the best MCU at the moment.

No external components, no Xtals, no nothing. Just 3.3v and it runs at 48MHz with a blazing speed.

Single cycle IO and single cycle 32x32bit multiply.

And full of perferials and 18 GPIO.

Dual UARTs, 4 timers, dual SPI (not limited to 8mbps), I2C, and watchdog and systick timer.
All IO-function pins are moveable to any physical pin through the switch matrix.

A real ATmega killer.

And small.
A complete ARM Cortex M0+ based synthesizer fits inside the MIDI-plug.

Amazing!

Btw, I just ordered another 50 LPC-812 just in case

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