[GreenKeys] Saving RTTY art as audio

[Bob Camp]

Hi

If I have a four hour tape and save it as binary it takes up about 80K 
as straight file. If we zip the thing it will drop down to less than 
30K since the mapping is not very dense. A few thousand tapes will take 
up 30 Megs on a web site. That's not to tough to find space for. Zip 
compression is not lossy you loose nothing in the process.

If you do a normal audio CD then the same four hours will soak up 640 
meg x 4 = 2.5 gigs. A reasonable compression probably drops that to 200 
Megs. Since sound compression is lossy you don't want to crank it up to 
far. MP3's are designed so the compression artifacts are not audible to 
the human ear. The same may not be true of a TU ....

Run up as MP3's the thousand or so tapes would soak up 200 Gigs on the 
web server. That's quite a bit more storage than the zip files.

It would be more practical to set up a java app that would take the 
binary file and put out tones. That way you would have the best of both 
worlds.

	Take Care!

		Bob Camp
		KB8TQ


On Feb 14, 2005, at 4:43 PM, Eugene Hertz wrote:

> Well, I will admit, the idea of saving it to audio isn't garnering 
> much interest, but I would say the benefit of doing this way can only 
> be explained in the same terms as George's new project. There is some 
> nostalgic, soft benefit of doing it this way. Why doesn't George just 
> have a website full of binary or ascii files that anyone can download? 
> I guess because there is something special in hearing the data and 
> using a TU to decode the data as it would have been received and 
> decoded from over the airwaves.  No other real benefit, and certainly 
> much bigger files!
>
> Eugene
>
>
>
>> -----Original Message-----
>> From: Tim McNerney [mailto:mc at media.mit.edu]
>> Sent: Monday, February 14, 2005 04:17 PM
>> To: greenkeys at mailman.qth.net
>> Subject: [GreenKeys] Saving RTTY art as audio
>>
>> Indeed, storing RTTY art for posterity is a noble cause.
>> Can you help me understand the rationale behind storing RTTY art
>> as audio files (MP3s, etc) instead of in binary form?
>> (i.e. "just the bits, ma'm")
>> For certain application, especially where there is
>> a time component, or where one is training RTTY operators
>> and the like, I can certainly understand the need for audio.
>>
>> --Tim McNerney
>> Newton, MA
>>
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