Signals & Systems
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Posted by Niall 84 on October 1, 2007, 5:43 pm
Please log in for more thread options We've an assignment in college to do which requires us to go and find all the answers to our questions ourselves, The only problem is i'm finding hundreds to different answers to all the questions!!! Hopefully someone can give me a more definate answer here!!! The formal definition of a signal? Getting all sorts of things on this, but hopefully I can get something more concrete!!! And How many dimensions does a T.V. signal have. In general i'm gettin an answer of either 2 or 3 for this, Anyone any idea which it might be? Thanks a million, Niall | |||||||||||||||||||||||||||||||||||||||||||
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Posted by Charles on October 1, 2007, 6:03 pm
Please log in for more thread options A signal is what you want and the noise is what you don't want and the signal to noise ratio (S/N) is ALWAYS the issue. | |||||||||||||||||||||||||||||||||||||||||||
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Posted by Brendan Gillatt on October 1, 2007, 6:20 pm
Please log in for more thread options -----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1 Charles wrote: >> And How many dimensions does a T.V. signal have.
That's a bit of a daft question - do they mean physical dimensions, Electro-magnetic dimensions or something entirely differnt. A dimension is simply a definable quantity that can be... defined. If they mean physical I'd say (though I'm no physicist) 1d - it simply travels in a line. Electro-magnetic is going to be 2. You could also include amplitude, polarity, direction, hell you could argue that the particular picture broadcast on teh TV channel is a dimension. - -- Brendan Gillatt brendan brendangillatt co uk http://www.brendangillatt.co.uk PGP Key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xBACD7433 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (MingW32) iD8DBQFHAXLDkA9dCbrNdDMRAqLOAKC6ReOkcvmj59inFplHAWA80izFDQCg3IBt qa5/Wa2dcFhwKx7RDuFm+Rc= =OdOM -----END PGP SIGNATURE----- | |||||||||||||||||||||||||||||||||||||||||||
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Posted by Charles on October 1, 2007, 6:26 pm
Please log in for more thread options
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1 > > Charles wrote: >>> And How many dimensions does a T.V. signal have.
>
> That's a bit of a daft question - do they mean physical dimensions, > Electro-magnetic dimensions or something entirely differnt. A dimension > is simply a definable quantity that can be... defined. > > If they mean physical I'd say (though I'm no physicist) 1d - it simply > travels in a line. > > Electro-magnetic is going to be 2. > > You could also include amplitude, polarity, direction, hell you could > argue that the particular picture broadcast on teh TV channel is a > dimension. Does not matter. A signal is what you want. Noise is what you don't want. Sorting them out is the challenge. | |||||||||||||||||||||||||||||||||||||||||||
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Posted by mpm on October 2, 2007, 10:10 am
Please log in for more thread options >
> > > > > > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1 >
> > Charles wrote:
> >>> And How many dimensions does a T.V. signal have.
>
> > That's a bit of a daft question - do they mean physical dimensions,
> > Electro-magnetic dimensions or something entirely differnt. A dimension > > is simply a definable quantity that can be... defined. >
> > If they mean physical I'd say (though I'm no physicist) 1d - it simply
> > travels in a line. >
> > Electro-magnetic is going to be 2.
>
> > You could also include amplitude, polarity, direction, hell you could
> > argue that the particular picture broadcast on teh TV channel is a > > dimension. >
> Does not matter. A signal is what you want. Noise is what you don't want. > Sorting them out is the challenge.- Hide quoted text - > > - Show quoted text - Actually, sometimes the noise IS what you want... For example, I've seen some two-way radio squelch systems that "detect" excessive noise above 10kHz in audio circuits to do funky things with encoding and speech compression, etc... Of course in that case, I guess you could argue the noise "is" the signal. Also, I vaguely remember some applications that would sample noise and adjust audio output to meet environmental listening requirements. I think DBX has some gear like this... --- But regardless of all that: My typical definition of "Signal" is: "...that which I want, but can't have because there's too much damn noise in the way!" Or maybe that's my Murphy's Law definition. I get them confused a lot. :) -mpm | |||||||||||||||||||||||||||||||||||||||||||
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>
> We've an assignment in college to do which requires us to go and find
> all the answers to our questions ourselves,
>
> The only problem is i'm finding hundreds to different answers to all
> the questions!!!
>
> Hopefully someone can give me a more definate answer here!!!
>
> The formal definition of a signal?
> Getting all sorts of things on this, but hopefully I can get something
> more concrete!!!
>
> And How many dimensions does a T.V. signal have.
>
> In general i'm gettin an answer of either 2 or 3 for this,
> Anyone any idea which it might be?