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Article #1000Re: Audio Input Problem
From: Pete Fraser
Date: Tue, 23 Apr 2002 07:55
Date: Tue, 23 Apr 2002 07:55
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2210 bytes
Normally a Mic input has a an impedance of about 1k. It also probably has a sensitivity of about 2-5mV. The output from a mixer is normally either 1V (0dBv) or 330mV (-10dBv). If the bottom resistor of the potential divider is 1k, then the top leg of 100k will probably give you a reasonable signal. Note however that Mic inputs on soundcards normally pick up more noise from the PSU, though if its from a portable running off a battery it shouldn't be a problem. Also note that as you're reducing the signal from your source and then amplifying it again, the noise level (hiss) will be increased, relative to using a line level input signal. Of course for a church sermon this will probably not be a problem. Rgds Pete (Part time sound engineer/ex. audio design engineer) "> > Do you think a 1000 to 1 divider will do the trick? > > I would try 100 to 1 first, but be aware that the impedance of the mic > input may upset this by being low. I would establish that first, but > it requires test gear.
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 10d0fc,2292e28121a1cd3e X-Google-Attributes: gid10d0fc,public X-Google-ArrivalTime: 2002-04-23 01:06:11 PST From: "Pete Fraser" <pete.fraser@at.frasersoft.dot.net> Newsgroups: borland.public.cppbuilder.multimedia References: <3cc1759f_1@dnews> <5363cu0oo8bda21svg9l4gn2np05bc2l4d@4ax.com> <3cc40f9d_2@dnews> <1te8cu0598adcffu3dj2dqcu9bvi299ifg@4ax.com> Subject: Re: Audio Input Problem Date: Tue, 23 Apr 2002 08:55:24 +0100 Lines: 19 X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 NNTP-Posting-Host: 195.12.18.10 Message-ID: <3cc5136b_2@dnews> X-Trace: dnews 1019548523 195.12.18.10 (23 Apr 2002 00:55:23 -0700) Path: arc1-ca.pugleaf.net!archiver1.google.com!news1.google.com!sn-xit-02!supernews.com!peer.news.opaltelecom.net!londen1-snf1.gtei.net!nycmny1-snh1.gtei.net!cpk-news-hub1.bbnplanet.com!news.gtei.net!nntp.abs.net!dca6-feed2.news.algx.net!sfo2-feed1.news.algx.net!allegiance!news-out.spamkiller.net!propagator-la!news-in-la.newsfeeds.com!news-in.superfeed.net!newsfeed01.tsnz.net!newsfeeds.ihug.co.nz!ihug.co.nz!dnews