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Audio tones question...

C

collegeradio

Weird situation..

We are airing a show that is broadcast live from a local sports bar in our town. It is carried as a satellite show on a number of other stations across the state. We don't have a dish or reciever, so we are just going to run an output from their setup into our marti..and carry the show like that..

Will our Audiovault system be able to detect the audio tones to fire local breaks even though we aren't using the sat?
 
I seriously doubt it. I'd say the Audiovault is expecting a contact closure from somewhere. Unless your Marti has the subaudible encoder/decoder with it and there is someone to push the button on the sending end and the relay contact on the receiving end is connected to the automation, you're not going to fire breaks.
 
The audio from a Marti isn't good enough to pass automation tones. Why not get an ISDN circuit...would be a lot more robust especially if you are attempting to do this on a satellite network. Sound would be a hell of a lot better.
 
Hmmm.. Try sweeping audio tones though your Marti system. Something tells me it MIGHT pass tones on a full-quieting signal.(if you don't get low-freq. much at all, there may be a filter in the receiver) If you wanted it perfectly flat, you could use a mulitband EQ at the receiver end to adjust the audio out to be flat to about 9kc if you are using a Marti with a 35kc I.F. filter. Try it.. You might be supprised how good it CAN work if you get things just right. Keep in mind a LOT of networks for sports and stuff still run G722 on ISDN that's only good out to about 7.5kc. Frankly, a properly functioning Marti can sound awsome for just old analog crap. I've ran several music shows via Marti before with pretty decent success. My advice to you though is sweep it out and DON'T OVERDRIVE THE INPUT causing the Marti to go into much limiting at all.Their limiters are very primitive, especially older Martis, and just really are there to prevent overdeviation. Overdriving them is what causes the muddy, semi-gimp sound many remote turn out sounding like. Trade a bit of S/N for keeping the levels down a bit to keep the limiter from muddying the sound up. If you have a extra Compellor or some other decent gain-rider, consider using it ahead of the Marti to keep levels conistant AFTER you test sweep it and make it flat.




Good luck ;D
 
Even if you were to get the tones over the Marti, you still need something back at the station that decodes the tones, which in turn pulls in some sort of relay closure to tell audiovault to start the next source. Right now that function lies in your satellite receiver.

It might be expensive to custom make this...might be cheaper and easier to pay a part time board op.
 
The newer (past 10 years) Marti RPUs have a subaudible encoder/decoder in them. I have a station that uses it to fire spot breaks on the automation from the remote - no board op needed. There is a button hooked to the Marti transmitter that keys the 25 Hz tone and it is detected at the receiver where it closes a relay that is connected to the automation. Works every time. If your Marti doesn't have this, it could be easily added by using a Conex encoder and decoder. The Marti should pass the tone without any mods.
 
Marti's have one closure available using the subaudible tone mentioned in the previous post.

I assume this network is using 25/35 Hz tones? Are they inserted at the network level or at the remote site (the sports bar)?
 
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