At 7:05 AM +1000 4/11/09, vickipowys wrote:
>Syd and anyone interested,
>
>In Waves Q10 you would use the Telephone Filter (which is a 10 band
>brick wall filter)
I believe I'm following why the techniques you describe are working
for you, Vicki. There could be some less apparent consistencies
across the suggestions that have been made that are worth pointing
out.
Doesn't the telephone preset offers two "brick-wall" filters-- one
would typically be a "high pass" filter and the other, a "low pass"
filter as you describe? Its been a while since I've used Q10, could
the other bands in this preset be parametric type?
As I recall, Lyrebird calls are quite robust. I'm not sure what
species Justin was recording but as the Lyrebird allows for low mic
pre gain, the background sounds (including the jets) would be in
lower in proportion and thus make rolling off as high as 500Hz much
less audible. Another way of saying it is, there's not as much
audible background ambience (at comfortable play back levels) in
lyrebird recordings to become adversely affected by eliminating under
500Hz with EQ.
>, then adjust its shape keeping the wall at only
>one end, and sliding that end up or down to the required frequency.
>Use your ears to hear what is happening. I think you shift-click to
>select a group of five filters so that they are all on (and unclick
>the other five to turn them off), then mouse-slide the frequency
>setting to where you want it.
>
>If you can't figure it out, send me a screen shot of the Q10 window,
>and I will tell you what to do.
>
>I found with filtering my lyrebird that mimicry e.g. of Crimson
>Rosellas, can sometimes be as low as 550 kHz, and beak snaps maybe
>lower. I tried filtering the calls up to 700 kHz but they sounded
>too thin and I thought 500 would be a safer bet. Andrew might care
>to comment on whether his DINR filtering would retain beak snaps
>below 500 Hz? Certainly Andrew is an absolute master at filtering,
>much better than I am!
I might be wrong, but I believe Andrew is rolling off only under a
100-125Hz and using DINR in a manner more similar to parametric
filtering than brick-wall filtering. Rob D.
>
>The Grey Shrike-thrush concert sounds good, yes send it, might be
>good for Audiowings.
>
>Vicki
>
>On 10/04/2009, at 11:06 PM, Syd Curtis wrote:
>
>> Hi Vicki,
>>
>> Am I right in assuming that Waves Q10 doesn't run on your
>> present
>> Mac?
>>
>> If so, can you remember enough of Waves to advise me on how to
>> brick wall
>> filter out everything above 500 Hz for adding the quiet background.
>>
>> BTW, somewhere I think I recall Norman filtering a lyrebird
>> recording to get
>> rid of noise by brick-walling up to 700 Hz - which agrees nicely
>> with your
>> advice of lyrebirds voices being above 700 Hz.
>>
>> There just might be an exception with Albert's. I seem to recall
>> their
>> imitating beak-snapping. My 1973 Tibro exotic pine plantation
>> recordings
>> included a beautiful concert from a Grey Shrike-thrush. (Would you
>> like it
>> for A/Wings? Or just to listen to yourself?)** Spoilt in one part by
>> aircraft noise. And noise from my parabola, I think. I filtered
>> it to 500
>> Hz, forgetting that it included beak-snapping - and that did appear
>> to be
>> affected by the filtering.
>>
>>
>> Best regards
>>
>> Syd
>>
>> ** Lasts 6 minutes, but you could use as little or much of it as
>> you wanted,
>> if there was a bit of space to be filled on an A/W CD.
>>
>>> From: vickipowys
>>><<vickipowys%40skymesh.com.au>>
>>> Reply-To:
>>><naturerecordists%40yahoogroups.com>
>>> Date: Fri, 10 Apr 2009 09:16:47 +1000
>>> To:
>>><naturerecordists%40yahoogroups.com>
>>> Subject: [Nature Recordists] Filtering out jet planes on a Mac
>>> (was flight
>>> path maps)
>>>
> >> And thanks to Ed Slater who first suggested the
>>> brick wall filter method, and to someone on this list who recommended
> >> TrackPlug5 as a replacement for Waves Q10.
> >
> >
>>
--
"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause
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