[ubuntu-studio-devel] Audio plugins

lukefromdc at hushmail.com lukefromdc at hushmail.com
Wed May 4 22:23:29 UTC 2016

With a too-high Q in an audio amp but short of oscillation you would get
"ringing" of the frequency in question and greatly increased amplification of
that frequency from the input signal. The level just short of that ringing would
be used by a CW (morse code) user in amateur radio to single out one tone
on a busy frequency with much interference. At RF, a radio receiver works 
exactly the same way.  Too high a Q in a radio transmitter or receiver will
cut sidebands and you will get reduced high freqency response.

On 5/4/2016 at 6:10 PM, "Ralf Mardorf" <ralf.mardorf at alice-dsl.net> wrote:
>On Wed, 4 May 2016 14:26:36 -0700 (PDT), Len Ovens wrote:
>>On Wed, 4 May 2016, Ralf Mardorf wrote:
>>>>> Perhaps I should write a Wiki about the "Q" parameter of a
>>>>> parametric EQ ;). SICR.  
>>>> There isn't one? Q is for adding a sine wave generator to your 
>>>> in case it doesn't have one...  
>>> For a parametric EO, the Q parameter determines how much 
>>> are affected around the selected centre frequency. You might 
>want to
>>> read the thread at LAU about the "Tilt EQ" too.  
>>It was a joke. One of things most filter designers try to avoid 
>>oscilation from too high of a Q. However Q in a filter is the same
>>term as that used in a transmitter tank circuit. (I was talking 
>>the analog world of course, digital EQ can do unrealistic high Q)
>Ok, self-oscillation is another issue, English isn't my native
>language. I also struggled with the English language when I tried
>to explain why a shelving filter, wich starts at a give frequency, 
>be considered a shelving filter to both sides of the frequencies, 
>an imaginary center frequency. Fons found the correct words, but 
>don't explain it that easy, as I tried to explain it.
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