4 ms·
Could sound better with a filter on the output.
by djmips 6y ago
Could sound better with a filter on the output.
- exDM69 6y agoYes, the legendary SID chip was a digital oscillator followed by an analog filter. After seeing this heroic SID chip reverse engineering (0), I tried building the filter section using a quad opamp to make the state variable filter. It sounds kinda nice for such a simple circuit. I've been planning a project of using a micro controller to do the oscillators and then use the PWM outputs to drive the filter control voltages. (0) http://forum.6502.org/viewtopic.php?f=8&t=4150 http://forum.6502.org/viewtopic.php?f=8&t=4150
- 8bitsrule 6y agoA passive filter (if you've got the headroom) doesn't have to be fancy ... just a capacitor and variable resistor will let you custom-mellow the excess highs. (Old radios had these for 'tone control' ;-)
- exDM69 6y agoYes, a little low pass will make a square wave much more pleasant to the ear. But a proper LP/HP/BP resonant filter is almost a musical instrument in itself.
- kennywinker 6y agoIt has one, check out the section labelled "Output filtering"
- djmips 6y agoThank goodness he listened to his friend. Still needs a better filter I reckon.