cr1901 changed the topic of ##yamahasynths to: Channel dedicated to questions and discussion of Yamaha FM Synthesizer internals and corresponding REing. Discussion of synthesis methods similar to the Yamaha line of chips, Sound Blasters + clones, PCM chips like RF5C68, and CD theory of operation are also on-topic. Channel logs: https://libera.irclog.whitequark.org/~h~yamahasynths
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<cr1901>
ej5: Does the sound blaster 1.0 have a sample and hold circuit so the DSP can accurately calculate the analog input value (via SAR)?
<ej5>
nope
<cr1901>
ej5: So, hypothetically, the input analog voltage from the microphone could be, say, 127/256 or whatever, and the SAR function reads the high order bit as 0. 1/2
<cr1901>
And then the analog voltage becomes 128/256 for the remaining 7 bits
<cr1901>
So the read value is 0...
<ej5>
yes, typically the voltage changes slowly because there is an input RC filter acting as a crude sample and hold
<ej5>
i think this is why recordings on an SB sound so awful
<ej5>
(there are other reasons too, but i think this is the main one)
<cr1901>
B/c it's low-pass filtered? Or b/c even w/ the low-pass filtered the SAH function can read bogus values?
<cr1901>
SAR* function
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