HPF
in [Live Sound]
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From: Eeyore on 13 Jul 2008 19:35 liquidator wrote: > Theoretically the windscreen on the mic is a mechanical filter. But the mic > itself is not. > No way, no how. Oh yes it is. That's where education comes in handy. Any moving coil transducer certainly can only provide a band pass function from basic physics. Loudspeakers provide a more obvious example of this but a moving coil microphone is not fundamentally so different. Condenser mics would be different however. That's why they exist. Better bandwidth for one. Graham
From: Eeyore on 13 Jul 2008 19:42 liquidator wrote: > "Eeyore" wrote in > > George's ProSound Company wrote > > > "Phildo" wrote > > > > "Arny Krueger" wrote > > > > > > > >>> Define: Filter > > > >> > > > >>> A device that _removes_ something from whatever passes > > > >>> through it > > > > NO ! Filters can boost too. Even passive ones. That's basic electrical > > theory. > > > > > >> > > > >> That would be a microphone - it removes highs and lows. > > > > > > silly me > > > I always refered to a microphone as a transducer > > > now arnii tells me its really a filter > > > > It's both a tranducer and a bandpass filter. Where do you think the -3 > > or -10dB numbers come from ? Out of thin air ? > > > > > when you be presenting your white paper on this one arnii? > > > > You'll find it all already in the AES archives. Even the microphone > > GRILLE acts partly as a filter. > > Regarding it as a filter is pretty risky ground. It's a diffraction filter pure and simple. > Since the output is not the same type of energy as the input, it certainy is > not primarily a filter. Pure nonsense and diversion. > I suppose the system as a whole could be regarded as a filter, since it > outputs sound sort of analagous to the input, minus whats lost in > translation, with coloration added. You need to study filters. Not so much electrical but *mechanical*. > But I have a really hard time considering the microphone itself s a filter, > since the sound and the mic output can NOT be directly compared. > > BTW you certainly are correct about filters being able to add. GOD YES ! RF circuitry is based on it. So are graphic equalisers. Where do you think the + dB come fom (simplification but basically true). Don't forget I did 4 yrs at London Uni and was comprehensively self-taught before that (not wishing to sound too pompous). Graham
From: Eeyore on 13 Jul 2008 19:46 liquidator wrote: > "Eeyore" <rabbitsfriendsandrelations(a)hotmail.com> wrote in message > > Denny Strauser wrote: > > > Eeyore wrote: > > > > <snipped throughout> Filters can boost too. Even passive ones. > > > > > > > > Even the microphone GRILLE acts partly as a filter. > > > > > > And spit on the grille is a good example. :-) > > > > Damn ! Reminds me of the punk days. First thing after the show was over > > was to collect the vocal mics, rush to the gents, remove the grilles and > > wash them out and dry them. Uh ! > > Used to carry a 1 gallon plastic bag and bottle of alcohol for that reason. You must be older than I imagined ! ;~) Graham
From: Eeyore on 13 Jul 2008 19:54 Denny Strauser wrote: > liquidator wrote: > > "Eeyore" <rabbitsfriendsandrelations(a)hotmail.com> wrote in message > >> Denny Strauser wrote: > >>> Eeyore wrote: > >>>> <snipped throughout> Filters can boost too. Even passive ones. > >>>> > >>>> Even the microphone GRILLE acts partly as a filter. > >>> And spit on the grille is a good example. :-) > >> Damn ! Reminds me of the punk days. First thing after the show was over > >> was to collect the vocal mics, rush to the gents, remove the grilles and > >> wash them out and dry them. Uh ! > >> > >> Graham > >> > > > > Used to carry a 1 gallon plastic bag and bottle of alcohol for that reason. > > I use Listerine. Alcohol is a universal solvent, but Listerine "Kills > germs dead" (their marketing slogan). Actually, I use Mint Listerine. I > get compliments how good the mic tastes & smells. > > But after a while, I have to take the windscreens off & clean them with > soap & water to get rid of the residue Listerine leaves behind. I'd be concerned the Listerine rots the foam myself. but seems you got away with it. Nice tip. Well for the next punk era anyway ! Graham
From: Eeyore on 13 Jul 2008 20:02
liquidator wrote: > Monitor cleanup was necessary too. I used to do one band whose vocalist worked for an ice cream company. (Walls actually). During their last song he'd throw out choc ices ! One landed in monitor land once. Yuk ! Graham |