Microphones in parallel to reduce noise
in [Design]
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From: Jim Thompson on 18 Dec 2009 16:12 On Fri, 18 Dec 2009 12:42:41 -0800 (PST), osr(a)uakron.edu wrote: > > > They are in a arc, 3 each side with uneven spacing and 4 touching >each other in the middle about the vertex. > >Steve What is claimed? Phased array? Directional? Selective with frequency? ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Help save the environment! Please dispose of socialism properly!
From: osr on 19 Dec 2009 11:16 Directional and Noise Rejection. Outer mics have low pass characteristics, , middle ones have peaks at high and low but are down in the mid range and inner 4 have high pass. Steve
From: Eeyore on 20 Dec 2009 22:08 osr(a)uakron.edu wrote: > On Dec 16, 9:23 pm, Eeyore wrote: > > o...(a)uakron.edu wrote: > > > AMBIENT ** noise pickup, not self noise !! > > >> In any case, YOU are 100% WRONG in your assumption that there ought to > > >> be a noise problem when combining the mics signals. Wired either in series > > >> or parallel, correlation still works to improve the s/n ratio. > > > > > Mixer front ends still add thermal noise > > > > Uh ? What's a 'mixer front end' ? Obviously you're not an audio > > professional and haven't a clue about current practice. You can make a > > mix stage today using inexpensive off the shelf parts that has 100dB or > > more dynamic range quite easily. > > > > So what's the mix stage chip ? > > Nope, My experience is with 1980s audio when every open channel was > a problem. It asn't a problem even then with well-designed gear. > I'm glad to admit that. I'm a laser/electro-optics guy. > > Any specfic AES paper? No need. It's the semi manufacturers that have produced the stunning parts available today, not the AES. 100dB dynamic range is quite routine. 120dB is not unusual on a single signal path. Try looking at app notes. Graham -- due to the hugely increased level of spam please make the obvious adjustment to my email address
From: Eeyore on 20 Dec 2009 22:11 "Michael A. Terrell" wrote: > Eeyore wrote: > > Michael A. Terrell wrote: > > > krw wrote: > > >> "Phil Allison" <phil_a(a)tpg.com.au> wrote: > > >>> "krw" > > >>> > > >>>> Some "dynamics" are really electrets in drag. > > >>> > > >>> ** Totally stupid bullshit. > > >>> > > >> In fact, you are. You and DimBulb; a perfect pair. > > > > > > Just don't try to seperate them. You know what happens when you try > > > to divide zero by zero. > > > > So, you're as thick as 'krw' are you ? > > > > Graham > > That's it. Change the subject when tou can't do anything else. > Typical loser attack. krw and you started the ad-hominem attacks because you have no relevant knowledge to be able to do anything else. Just like the AGW crowd in fact ! Graham -- due to the hugely increased level of spam please make the obvious adjustment to my email address
From: krw on 21 Dec 2009 00:04
On Mon, 21 Dec 2009 03:11:18 +0000, Eeyore <rabbitsfriendsandrelations(a)notcoldmail.com> wrote: > > >"Michael A. Terrell" wrote: > >> Eeyore wrote: >> > Michael A. Terrell wrote: >> > > krw wrote: >> > >> "Phil Allison" <phil_a(a)tpg.com.au> wrote: >> > >>> "krw" >> > >>> >> > >>>> Some "dynamics" are really electrets in drag. >> > >>> >> > >>> ** Totally stupid bullshit. >> > >>> >> > >> In fact, you are. You and DimBulb; a perfect pair. >> > > >> > > Just don't try to seperate them. You know what happens when you try >> > > to divide zero by zero. >> > >> > So, you're as thick as 'krw' are you ? >> > >> > Graham >> >> That's it. Change the subject when tou can't do anything else. >> Typical loser attack. > >krw and you started the ad-hominem attacks because you have no relevant >knowledge to be able to do anything else. Just like the AGW crowd in fact ! > You really are trying to one-up DimBulb. You're a close second, I gotta give you that. |