Re: Ultrasonics - being more specific


Subject: Re: Ultrasonics - being more specific
From: Coryn Smethurst (corynrrsmethurst@tiscali.co.uk)
Date: Wed Oct 06 2004 - 17:24:35 EDT


I am intending to use a Metric Halo which I've been told goes all the way up
on the mic pre's, and converters. For the input I am hoping to use a pair
of DPA mics with the new fangled wind sac protectors for outdoor er wind
protection - has anyone per chance tried these? They are supposed to be
wonderful, according to DPA's website ...

crrs

on 5/10/04 13:09, Philippe-Aubert Gauthier at
Philippe-Aubert.Gauthier@USherbrooke.ca wrote:

> Also take a look at your microphone (some are designed for ultrasonics) and
> preamp specifications.
>
> David Greisinger have demonstrated that some sound cards pretending to record
> ŕ
> 96kHz was just in fact interpolating between lower sample rate analog/digital
> conversion. I think that when he called to sale office to say something like
> "Hello I am Mister Griesinger (you know, the Lexicon reverb, that's me!) and
> your sound card is not making 96kHz but its writen on the package" he then get
> such an answer "Oh yeah, we know but the electronics chips can make it record
> at 96kHz but its not implemented" or "Yeah, but we filter everything above
> 22kHz before ADC." I don't remember the sound card name, but it was a popular
> and common one!
>
> So : we should not even trust the specs!
>
> Selon Ryan Torchia <torchia@buffalo.edu>:
>
>> Max/MSP will do it in realtime too, and wouldn't require any additional
>> hardware, although you'd probably need specialized hardware to record
>> 18-48kHz.
>> --Ryan.
>>
>> Coryn Smethurst wrote:
>>
>>> Thanks for this, but I was hoping someone knew of a program which didn't
>>> need additional hardware, so I could use it out and about with my Apple
>>> Powerbook - my fault for not being more specific. Does anyone know of a
>>> program which would fulfill my requirements?
>>>
>>> thanks as ever
>>>
>>> crrs
>>>
>>> on 3/10/04 14:29, David Mooney at moko@city-net.com wrote:
>>>
>>>
>>>
>>>> Kyma could do this in realtime.
>>>>
>>>> Coryn Smethurst wrote:
>>>>
>>>>
>>>>> Does anyone know of a program which will filter out frequencies below
>> about
>>>>> 18khz then transpose frequencies above this threshold into the audible
>> range
>>>>> preferably real-ish time? The software would obviously have to cope with
>> a
>>>>> 96khz sampling rate. I'm a Macintosh user ...
>>>>>
>>>>> Any help appreciated.
>>>>>
>>>>> crrs
>>>>>
>>>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>
>
> %====================================================================%
> % Philippe-Aubert Gauthier, B.Ing, M.Sc. %
> % Étudiant au doctorat en reproduction de champs acoustiques %
> % %
> % GAUS (Groupe d'Acoustique et de vibrations de l'Université de %
> % [ Sherbrooke) %
> % CIRMMT (Centre for Interdisciplinary research in Music, Media %
> % [ and Technology) %
> % %
> % http://www3.sympatico.ca/philippe_aubert_gauthier/acoustics.html %
> %====================================================================%



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