[linux-audio-user] Removing AC hum after the fact.

[Dave Phillips]

Adam Sampson wrote:

>"Alex Polite" <notmyprivateemail at gmail.com> writes:
>
>  
>
>>Are there any tools that will help me define the notch filter by
>>looking at the my audio?
>>    
>>
>
>Jamin's actually quite good for doing this, since it's got a nice
>spectrum display and interactive EQ settings. Failing that, you could
>use a LADSPA filter (like "Single band parametric") and a spectrum
>analyser (like Jaaa) and just tweak the filter settings until the peak
>you see on the analyser disappears.
>
>[player] -> [JACK Rack with SBP] -----+----> [recorder]
>                                      |
>                                      v
>                                    [Jaaa]
>
>If it's really mains hum, then you can probably just cut the
>frequencies below 130Hz or so.
>  
>
Maybe a notch filter at 60 Hz would be even better ?

Best,

dp