FvM said:A 1:10 frequency range can be achieved with variable resistors, possibly up to 1:30 or even 1:100 with logarithmic characteristc.
But you need one variable resistor for each filter order, would be 8 for your filter. I don't actually see the purpose of an 8th order filter
for usual audio applications, but also for standard 3rd or 4th order crossover-filters, you often need to design your own multi-potentiometer
mechanics. A filter circuit, that uses equal R values should be preferred, but it's feasible for butterworth.
Larger frequency range filters would better use electronical variable filters (as known e.g. from a Moog synthesizer). They have more
noise and distortion than a fixed or variable resistor filter, however. State-of-the-art professional equipment is more and more using digital
signal processing for filters, by the way.
shoe said:................
So, I need to build a multi-potentiometer, electronically controlled which splits over all of those orders of filter?
The original post mentioned 16 bit resolution, MF10 or other switched capacitor designs are clearly much worse, also many voltageany background mush should be drowned out by your music
LvW said:shoe said:................
So, I need to build a multi-potentiometer, electronically controlled which splits over all of those orders of filter?
Are you aware of the fact that tuning the pole frequency is not possible without changing the pole Q of each filter stage - thereby loosing the Butterworth response ?
betwixt said:assuming your application is producing sound anyway, any background mush should be drowned out by your music.
shoe said:Is that what everyone does, just buys IC's with the filters allready prefabricated?
I was hoping somone could, for interests sake, help me turn a vacuum tube into a filter. I'd need to know the differences between a op-amp's response, input, voltages, etc and a vacuum tube's though. I think its do-able since they have the same function...
Audioguru said:I don't know why you want to reduce high audio frequencies to make a muffled sound.
I also don't know why you want the cutoff frequency to be adjustable.
An opamp has distortion as low as 0.00008%.
A vacuum tube has distortion as high as 10%.
FvM said:tb-303 utilizes a voltage controlled 4th order filter with a variable feedback. It has surely more than 12 db/octave roll-off.
I heard your variable muffling effect and I have heard it before. A switched capacitor lowpass filter IC will do it very simply.shoe said:Im not sure what kind of music you listen to, but filters of this kind have been used since the 50's and 60's. The reason is because it sounds good. Filters are extensively used in modern electronic music, and frequently in other genres too. The filter, in its own right, could be termed a musical instrument.
Example MP3 attached (trance, psychedelic)
Overdrive is a form of severe distortion. There are many ways to make the signal clipped.... (clipping's severe distortion) ...
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