Hi David,
thanks for taking the time to play around with the track - I had a listen and
it's given me a few ideas on how to get the desired results using an equalizer
and noise reduction.
Will post when I have something ready....
Thanks
Marc Anderson
--- In "Avocet" <> wrote:
>
> Marc,
>
> I've had a good play with your track using Audacity V1.3 and
> have pushed it a bit so you can see what can be done and the
> snags.
>
> DR000938michisssample.wav
>
> On track box down arrow - select Waveform (dB) display
>
> I've included the scripts below to add to the Audacity file
> \Audacity\EQCurves.xml or just copy the GIFs. If you alter
> the code, save a backup in case you goof up. :-)
>
> Apply Effects - Equalisation as in
> www.stowford.org/sounds/hpf800-2-4-6.gif
> This is my standard bass cut which limits low frequency
> artifacts when using noise reduction. The numbers are the
> slopes in dB per octave.
>
> Select sample at 00:26.700 for 1 sec
>
> Effects - Noise Removal - Get Noise Sample.
>
> Select all and apply Effects - Noise Removal - 9dB; 500Hz;
> Attack 1.0secs
> I usually use 500Hz as it gives fewer LF artifact.)
>
> This lowers the general HF b/g noise
>
> Select sample 01:03.400 for 1 sec. This is a distant cicada
> sample.
>
> Again, Effects - Noise Removal - Get Noise Sample
>
> Select all and again apply Effects - Noise Removal.
> Note: a second noise reduction only works with a different
> frequency sample.
> The general cicada noise is now lowered. Dynamic range is
> too high with HF peaks near the end.
>
> Reduced dynamic range with a "limiter" setting of the
> compressor:
> Effect - Compressor; 16dB; 60dB; 10:1; 0.1sec 1.0sec; make
> up gain "no"; Compress based on peaks.
>
> Now the quieter sounds are more prominent.
>
> Listening to whole track, at 01:20.000 the high frequency
> peaks tend to cause distortion.
> Applied Equalization - see
> www.stowford.org/sounds/step4000to10kminus6.gif
> Not enough - do it again.
>
> This version is on
> www.stowford.org/sounds/dr000938michisssamplenrnrcompstep.mp3
>
> There is a little burbling from the double noise reduction
> and a steeper bass cut would probably reduce this but remove
> the pigeon as well.
>
> I tried boosting the pigeon frequencies after finding them
> using the spectogram display and applying the bandpass
> filter:
> www.stowford.org/sounds/bpf300to400plus6.gif
> but it brought up the burble as well.
>
> The answer to the low level burble is to mask it with a low
> level parallel track of the original after rolling off
> frequencies above 100Hz.
>
> Have fun. :-)
>
> David
>
> David Brinicombe
> North Devon, UK
> Cogito cogito ergo cogito sum - Ambrose Bierce
>
>
> Scripts to add into the file: \Audacit\EQCurves.xml
> Save a backup first. :-)
>
> <curve name="HPF800-2-4-6">
> <point f="20.000000000000" d="-26.000000000000"/>
> <point f="200.000000000000" d="-6.000000000000"/>
> <point f="400.000000000000" d="-2.000000000000"/>
> <point f="800.000000000000" d="0.000000000000"/>
> <point f="22049.000000000000" d="0.000000000000"/>
> </curve>
> <curve name="step4000to10Kminus6">
> <point f="21.000000000000" d="0.000000000000"/>
> <point f="4000.000000000000" d="0.000000000000"/>
> <point f="10000.000000000000" d="-6.000000000000"/>
> <point f="22049.000000000000" d="-6.000000000000"/>
> </curve>
> <curve name="BPF300to400plus6">
> <point f="21.000000000000" d="0.000000000000"/>
> <point f="150.000000000000" d="0.000000000000"/>
> <point f="300.000000000000" d="6.000000000000"/>
> <point f="400.000000000000" d="6.000000000000"/>
> <point f="800.000000000000" d="0.000000000000"/>
> <point f="22049.000000000000" d="0.000000000000"/>
> </curve>
>
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