Re: [avr-gcc-list] sine wave generator. ~~~

[Grant Stockly]

At 07:41 AM 7/26/2002 +0200, you wrote:
> How about this:
>
> http://www.myplace.nu/avr/minidds/
>
> Always been meaning to try it out :-)

http://www.stockly.com/adc/

I used an R2R network back in '99 to make a NTSC video driver and sound 
sampler.  Before reading the following pages, be sure to know that I didn't 
know much back when I was in 9th grade.  : )  I was NOT biasing the input 
audio correctly, effectively clipping ALL audio below 0v!  : )  I should 
also point out that musical tastes have changed greatly!  : |

It still sounded somewhat good for a 8bit R2R (6 bit effective, non laser 
trimmed resistors are horrible).  The first tests used an R2R for input AND 
output.  Later on I used the ADC on the mega and 8515 for input (still too 
stupid to bias) and an R2R for output.

I never published my final results, which included a biased input (bass 
finally worked!  ; )  )  If anyone is interested, I can dig them up...

I also played around a little, trying to make neat sound effects.  Take for 
example http://www.stockly.com/adc/test.mp3 (Temptations - My Girl).  I 
disconnected the analog comparator wire (required for ADC R2R operations) 
and so the comparator was cycling in and out.

Grant

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