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GPK ·
Hello all!
I'm just wondering if any of you DSP gurus out there have implemented linear phase filters in synthmaker? I'm writing a plugin where linear phase is quite important and I need to implement high and low shelf filters.
Thanks a million,
G
GPK ·
Anyone any thoughts?
🙂
subrock ·
this might help
http://cnx.org/content/m10700/latest/
oppenheimer and schaeffer has a good section on linear phase filters as well. Haven't made one myself though.
Disco_Steve ·
An average is a low pass filter which is linear phase (as it is the simplest FIR filter there is pretty much), and if you subtract a low passed signal from the original, you get a high pass filter. a average is very simple to implement efitiently but the resulting filter has a very slow role off, but with no wobble in the pass band so sounds very nice, if a low dB per octave low pass will do you then the average should be fine, if you need a higher dB per octage rate then you can chain them.
it should be noted though that to time align the filters, a delay must be added of half the length of the average.
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