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 Forum index » DIY Hardware and Software
S/H => bitcrusher-style
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synthmonger



Joined: Nov 16, 2006
Posts: 533
Location: flada
Audio files: 3
PostPosted: Tue Feb 17, 2009 2:49 pm    Post subject: Reply with quote  Mark this post and the followings unread
Hey Tom you might wanna try using the 40106 vco I posted in the Lunetta thread as your main clock source for this circuit. Works pretty good!
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rumpofsteelskin



Joined: Apr 22, 2009
Posts: 18
Location: brighton, uk
PostPosted: Wed Jun 17, 2009 9:54 am    Post subject: Reply with quote  Mark this post and the followings unread
bigtex wrote:
It all starts with a sawtooth wave. This is quantized by the first S&H chip and turned from a ramp shape into a staircase shape at a rate determined by the clock.

That same original sawtooth wave is also fed into a comparator. It is compared to the audio input. Every time the comparator's state changes (caused by the sawtooth wave or audio input becoming higher or lower than the other) the second S&H samples the current step of the staircase wave.


Has this been abandoned?? I was toying around with it but noticed two problems -

- Changing the sample rate also changes the amount of quantization levels; lower sample rate = more amplitude levels. This could be sorted by phase locking the square wave to the sawtooth wave.

- The speed of the square/pulse wave looks to be prohibitively fast. Say if you want maximum resolution at 20KHz, then a minimum of 40K sawtooth wave to sample it with, and then assuming that 14bits is the maximum fidelity bit depth, that means 2^14 = 16384 possible amplitude levels. Which means the square wave clock must be at minimum 166384x40000 = 655MHz. This must also be variable to give the lowest resolution at the lowest frequency, say 30Hz. 30x2x2 = 120Hz.

Unfortunately, this doesn't look feasible which is quite a shame, the idea of it is pretty clever.

I think probably the only way to do the amplitude quantization is digitally...

does anyone know how the frostwave sonic annihilator works??
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rumpofsteelskin



Joined: Apr 22, 2009
Posts: 18
Location: brighton, uk
PostPosted: Wed Jun 17, 2009 11:37 am    Post subject: Reply with quote  Mark this post and the followings unread
*sonic alienator, rather...
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