Wheeeeeeeeeee !!

[Dr S Grainger]

At 03:08 PM 10/30/98 +0100, you wrote:
>Hi all,
>
>I have this silly idea of using DSP as a VCO. Here's how:
>
>ADC (or maybe few ADCs) is the voltage input.
>DSP runs few phase-accumulating DCOs with lookup tables
>and, say 16 DACs produce nice waves
>although one stereo 16-bit S-D DAC would be the simplest
>and cheappest way for clean waveforms
>And DSPs start from $9! (at least for me)
>
>Roman
>
	Looked at this idea - if we have a fixed sample frequency of
	50kHz this gives a 20us sample period. For 16 oscillators to
	give dual oscillator 8-note polyphony that gives 1.25us per
	oscillator.

	If we're working with 24-bit pitch resolution then multiple
	additions would be required in this period as well as reads
	and stores (as well as outputting the samples).

	Would your proposed DSP run at this rate and handle say an
	asynchronous interface (eg. a MIDI stream) ?

	Please send code, schematics and your bill to......Synth-Diy !!!

	Regards

	Steve Grainger


Dr. Steve Grainger
MiB Centre Manager
School of Engineering and Advanced Technology
Staffordshire University
Beaconside 
Stafford 
Staffs
ST18 0AD
Tel: +44 (0) 1785 353322	Mobile: 0973 832122
Fax: +44 (0) 1785 353551