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'[EE] hardware modulation, software demodulation'
2007\01\20@080840 by slippyr4

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Hi All,

I'm struggling with finding any info googling, so I'm hoping someone
on here has some links or info...

I need to store digital data on an audio soundtrack. Source data rate
is not higher than 4800 bps, bandwidth of audio soundtrack is 32 KHz.

The store solution needs to be hardware based, and lowish cost...
ideally PIC, or PIC+modulation circuitry.

The decode needs to happen on a PC, so the modulation parameters need
to be published and understandable.

Anyone got any ideas?

Jon

2007\01\20@085204 by Wouter van Ooijen

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> I need to store digital data on an audio soundtrack. Source data rate
> is not higher than 4800 bps, bandwidth of audio soundtrack is 32 KHz.

You have ample 'room' between the baudrate and the audio bandwidth, so a
simple FSK modulation should do. IIRC 1200 baud tape (casette) recording
used to be common, scale the frequencies up by a factor 4 and try that.

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: http://www.voti.nl/hvu


2007\01\21@012004 by Richard Prosser

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You could try Googling "Kansas City Standard" IIRC it was 1200 baud
onto cassette tape but is likely to be scalable with a higherf
bandwidth media,

RP

On 20/01/07, Wouter van Ooijen <spam_OUTwouterTakeThisOuTspamvoti.nl> wrote:
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> -

2007\01\21@054400 by Dario Greggio

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Richard Prosser wrote:

> You could try Googling "Kansas City Standard" IIRC it was 1200 baud
> onto cassette tape but is likely to be scalable with a higherf
> bandwidth media,

I can send the source code for C64 as it was used in old times :-)

--
Ciao, Dario

2007\01\21@085338 by enkitec

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       Look at:

       http://www.cmlmicro.com/products/WData/FX469.htm

       That will give you some ideas.


On 21 Jan 2007 at 14:20, Richard Prosser wrote:

{Quote hidden}

2007\01\22@034845 by slippyr4

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Thanks guys, some good ideas there. I'd been thinking of modem chips,
and not having much luck - but 80's computer game sqwauks is a good
lead!

thanks

jon

On 21/01/07, enkitecspamKILLspamgmail.com <.....enkitecKILLspamspam.....gmail.com> wrote:
{Quote hidden}

>

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