recording AM broadcasts - days and weeks worth

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cackalackey
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recording AM broadcasts - days and weeks worth

Post by cackalackey » Wed Dec 05, 2007 2:48 am

Dear Audacity experts,

I've been reading the posts in this gen'l discussion area, and haven't yet seen a question like mine.

Can Audacity be used to record long periods of broadcast radio? Please note I AM NOT seeking to record brief songs or single radio shows. I am seeking to record many hours or entire days of AM radio broadcasts.

I wish to leave the system running and return to it days later. And once I have learned where the important audio is, I wish to hit "save," if you will, and capture the audio segment I need. Moreover, I think I'll need to time-track the audio, so that I can identify segments by when they were broadcast.

I also hope to set up the system so that a series of recordings will record on top of previous recordings, to conserve hard-drive space.

Any thoughts? Would it be better to use a video editor for this task? If so, what software names should I look at?

Many thanks,

John

kozikowski
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Re: recording AM broadcasts - days and weeks worth

Post by kozikowski » Wed Dec 05, 2007 6:09 am

<<<Would it be better to use a video editor for this task?>>>

I've done it that way, although you can't make it record over old files. You may not be able to go days and days, either. You can either use a time code generator and feed that into the video input, or something as exciting as a small camera looking at the face of a clock.

Let's see. If somebody forced me to do this...... We have surveillance systems that will do this. Highly compressed, runs for days and you can export video and (I think) audio chunks as needed. When the massive power transformer exploded outside the building, we got it all on surveillance video--including the engineer who was out there and soiled his laundry when it happened.

We made sure everybody saw that video.

Koz

waxcylinder
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Re: recording AM broadcasts - days and weeks worth

Post by waxcylinder » Wed Dec 05, 2007 9:59 am

Koz, when I worked for DEC we got, on the surveillance video, the security guy who set fire to the main computer room - in order that he could be the brave hero who put the fire out. Instead he was fired .....

On topic: I remember recently reading a longish thread about long recordings somewhere on the forum - IIRC one of the developers said that they thought that c. 48 hours may be a theoretical maximum for Audacity to work - provided you have enough disc space ......

WC
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kozikowski
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Re: recording AM broadcasts - days and weeks worth

Post by kozikowski » Thu Dec 06, 2007 1:17 am

<<<provided you have enough disc space ......>>>

Yeah. You run into all sorts of oddball problems when you go to multi hour recordings. The surveillance systems compress the video to pieces before they try to record on a drive.

Koz

richardash1981
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Re: recording AM broadcasts - days and weeks worth

Post by richardash1981 » Fri Dec 07, 2007 8:13 pm

Audacity is not the tool for this job at all. There's a (*nix - specific) solution in this thread:
[url]http://audacityteam.org/forum/viewtopic ... &sk=t&sd=a[/url]

The point is that what you want is a load of medium-length files, named by the TAD of recording, which you copy as needed. To reclaim disk space delete the older files, either manually or with a nightly cron job (use find -delete with an appropriate filter on creation time of files).

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