Analog to Digital

  • Thread starter IT_GE
  • Start date
  • #1
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from analog to digital(PCM/QAM)

I want to convert analog to digital.

I am recording analog signals in my firm and i want to make a programm witch helps me to decode fax informations.

if you know how to decode this analog signals witch is modulated with PCM/QAM, please help me.
 

Answers and Replies

  • #2
chroot
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Obviously, you'll need an ADC and a DSP. If you could tell us more about your system, we can be more helpful. Of course, you might want to consider hiring a contractor with the appropriate skills.

- Warren
 
  • #3
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ok

now i have connected with line in cable to the my phone cable. i am sending faxes to another line and recording it's analog signals with sound forge.

i have documentation about qam but i cant get any digits from this vawe files.

i am searching algorithm how to demodulate analog signals and get fax data as tiff, bmp or jpg or another fortmat
 
  • #4
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This product might help you: http://www.vectronics.com/vectronics/products.php?prodid=VEC-1613 [Broken]
 
Last edited:
  • #5
8
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no
I not need any products.
I want to write a program wich will be integrated in my system.
 
  • #6
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i am paralell connected to the analog phone line witch is using to send/receive faxes.
i am recording this analog signals in vawe/pcm format.
i know how fax protocol is working, but i don't know how modulates digital signals to analog... and how to demodulate analog signals and get digital data.

i am askign you...
if you have any documentation about fax modulation or you can help me, please make it now.
 
  • #7
chroot
Staff Emeritus
Science Advisor
Gold Member
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IT_GE:

You're essentially asking us to give you a university-level education on signals and digital signal processing. It's quite simply outside the bounds of what we can teach you on an online forum. I suggest buying some books, or taking some classes. You need to learn quite a bit before you can do what you're trying to do.

- Warren
 
  • #8
8
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ok

chroot

i know how analog and digital signals work.

but i need documentation about fax modulation.

i can't find this documentation.

if you know where i can get this documentation please tel me.
 
  • #9
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IT_GE:
Goto Google and look under Facsimile Coding Schemes
I think you will find all the information you need.
 
  • #10
40
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IT_GE:
if you know how to decode this analog signals witch is modulated with PCM/QAM, please help me.
-------------------------------------------------------------
PCM=PULSE CODE MODULATION
QAM=QUADRATURE AMPLITUTE MODULATION
A FAX MODEM CONTAINS ALL THE HARDWARE TO CONVERT THE
SIGNALS FROM ANALOGUE TO DIGITAL,use a programming language
to capture-decode-manipulate-present digital data,there's very little
decoding left to do,just get fax protocal details to give an idea what
you have to do with the software
 
  • #11
40
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i suggest you buy from a vendor that provides you with complete
tools--hardware-drivers-libs and make sure your programming language
is compatible with those
 
  • #12
8
0
ok
thank
i know what is qam and pcm.
i have files witch is recorded as pcm wav file.
i know fax is using qam for modulation/demodulation of digital data to/from analog sygnal.
i know how to get tiff images from the digital data, but i don't know how to connvert this analog signals.
i have documentation about modulation, but it not like the really situation and not works properly.
i searched this info in google but no answer.
 

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