On Thu, Feb 14, 2013 at 8:14 AM, Fons Adriaensen <fons@xxxxxxxxxxxxxx> wrote:
On Thu, Feb 14, 2013 at 01:40:23PM +0100, Brendan Jones wrote:The original had most of the signal above 2kHz or so almost gone, so
> Just personal preference, but I think both of these have an
> unacceptable amount of hissing that is not present in the original.
this had to be boosted. Tape hiss gets amplified in the same way (this
was a _casette_ recording). It's probably possible to remove some of
the hiss using an FFT-based multiband expander.
Which is pretty much exactly what I did. I used WaveARTs MRNoise for this purpose, I have access to Izotope RX2 as well, but given that the signal there is so weak, I didn't use that in a destructive manner, and I am finding I prefer wavearts for primarily high frequency noise. However since RX2 is a new acquisition for me I am still learning their strengths and weaknesses.
> Can you explain what you did exactlySecond order shelf filter, +12 dB or so at 4 kHz and above. There were
some faint traces of signal around 8 kHz, so a very narrow band around
that frequency was boosted a few dB more.
Heh it is very interesting to hear you describe it, as I didn't look at the signal analysis at all when I did mine, but also put in a fairly sharp lowpass filter at 12k as I didn't hear anything usable above that when I boosted. Now I am curious to go back and try out what you describe as well as look at the statistical analysis and see if it can be improved a bit more or not, I just don't have time these days sadly. This was a quick 15 minute project or so to see what I could do out of my own curiosity while I had some spare time before a meeting.
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