[sdiy] reducing amount of bits

[Grant Richter]

> Okay, if i have a 5V p-p signal centered at 2.5v and I feed it into the ADC
> (set to have 5v max), using all of its bits will work. But if I cut out, say,
> the bottom half, will I be left with a 2.5V max positive half-wave, then a
> flatline for half a cycle, and then another positive halfwave? Or do ADCs
> translate the information so that dropping out bits leads to less and less
> *detail* but still full amplitude?
> Or is it that some ADCs do it one way and others do it another?
> I don't know any of the keywords for adc/dac selection but I could've sworn
> someone had just done this grungifier project recently...

Just drop out the bits from LSB (least significant) to MSB. You will keep
the same amplitude, but lose detail.

Bank 6 of the "Socket Rocket" EPROM for the Blacet Mini-Wave does this from
8 bits down to 1 bit.