Topic: Notch Filter

[cavekelly]

I have been pretty much out of the game for a while and have virtually no post skills beyond tracking and fades.  I am currently trying to go back to a trove of dats for basically personal use.  I have discovered two dats, made the same evening at different jazz clubs in Manhattan, with the same anomaly.  It is a constant frequency buzz (at a fairly high frequency).  I vaguely rememeber I determined at that time it was the result of leaving the light on my D-8.  Never did that again!

So how do I remove the buzz and with what tool?  Thanks in advance for the input.

[page]

The cheapest way would be with Audacity.

The easiest way; First, figure out what the frequency is and then see this thread about removing select frequencies and note the photo of the third reply with the spike.

A more complicated way; Noise reduction. If you could find a portion of the tape which is just the buzz, then you could probably make a good stab at use a noise remover, but if you are looking at fixing an audience tape I'd either select a different tool than Audacity or tinker with the EQ to try and isolate that buzz frequency band before I took a sample for the noise reducer to learn (and then apply the reducer on the main original 2 tracks).

If the noise is neatly contained in a consistant band and you can get a very tight focus on that band (e.g. it's less than say 10hz across) then the EQ notch filter idea is a real posibility, otherwise I'd look toward a noise reducer (and spending a lot of time learning how to use it effectively; it's a grenade, you can do a lot of damage easily).