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From: Kevin McMurtrie
Subject: Re: Is it Possible?
User-Agent: MT-NewsWatcher/3.2 (PPC Mac OS X)
Date: Mon, 13 Jan 2003 12:17:33 GMT
NNTP-Posting-Date: Mon, 13 Jan 2003 04:17:33 PST
In article ,
"Ken McDonald" wrote:
>"Kevin McMurtrie" wrote in message
>> In article ,
>> "Ken McDonald" wrote:
>> >I want to build a circuit to eliminate the center channel from a stereo
>> >input. I think I can do it by inverting one channel and sum it with the
>> >other channel. Or feed both inputs into a differential amplifier. The
>> >problem is I end up with a mono output.
>> >What I really want is to eliminate the center channel and still have a
>> >separate left and right channel. Is it possible?
>> Not with simple linear circuits. The best you can do is to remove a
>> fraction of the common signal and send that to the center channel. It
>> works in moderation. The more it's done the more the sides become
>> inverted mono, as you mentioned.
>> Do a web search for surround sound decoders and center channel decoders.
>> A circuit is programmed with a set of rules for adjusting the levels of
>> each speaker to guess the sound placement. An encoder is designed to
>> help trigger those rules. The key word here is "guess." It works for
>> some kinds of audio but mangles others. Dolby has most of the patents
>> DVD offers six independant channels. There's no placement guessing.
>> The only limitation is that the sub channel has a 200Hz cut-off.
>> Speaker placement has a lot to do with all of this. Driving front and
>> rear speakers with plain two-channel stereo can sound better than
>> two-channel Dolby decoding when all the levels, echoes, and phases are
>> just right.
>Thank you for the answer. I'm not going to use the circuit for my stereo
>system. I plan on connecting it to the output of my computer and use
>headphones. I want to listen to particular music with the common signal
Paint over the ground lead (at the base of the plug).
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