Re: distinguish between fax and speech
- From: "VSP" <aliter05-newsletters@xxxxxxxxxxx>
- Date: Thu, 26 Jan 2006 12:16:05 -0600
>
>
>VSP wrote:
>
>
>>
>> Could you or anyone else atleast tell me a good online source where i
can
>> read about how the FAX data to be transmitted is exactly coded.
>>
>> Again, i am trying to look for a property in this coding that would
help
>> me distinguish it from other transmissions eg some kind of periodicity
in
>> the coded signal etc.
>>
>
>You do not need to know how the fax works to distinguish the fax/modem
>transmission from the speech. The spectum of the speech rolls down
>toward the high frequency; the spectrum of the data transmission is
>basically flat. All you have to do is to weight the high frequencies vs
>low frequencies.
>
>Vladimir Vassilevsky
>
>DSP and Mixed Signal Design Consultant
>
>http://www.abvolt.com
>
>
hi
I can a novice in DSP so. please help me out a little more.
Can the fact that the spectrum of speech rolls down towards high
frequency be used to distinguish it other data transmission as well.
That is to say, is this property unique to speech only?
.
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