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I would like to find out, if it’s possible to use one computer for processing audio sygnal with Breakaway and simultaneously to send (encode) the processed audio with the help of the same computer through optical fibre? (to the transmitter, where there will be a hardware decoder)
I tried to make a drawing to ensure you understand what i exactly mean
One important detail – at the beginning audio is ANALOG, and at the end it’s ANALOG too (it is digital only on the way from computer to STL, then it’s decoded back to analog
Thank you
Yes it is.. depending on the distance you might need also some extra hardware to keep the S/PDIF signal strong and clean all the way to the transmitter site (glass fiber instead of plastic?)
What is this extra equipment then? and what sound card with optical out would you recommend better? ESI Juli@ is good? Concerning plastic or glass fibre, I don’t know yet
First of all, what kind of "decoder" you have at the transmitter site? I think whichever soundcard that supports 192kHz output from digital output is suitable. ESI Juli@ is perfectly suitable also for being the analog output to transmitter which would lead to a recommendation that you should move the whole processing to the TX.. it’s better to move only program feed and not the whole MPX through STL..
[quote author=”Modulator”]First of all, what kind of "decoder" you have at the transmitter site? [/quote]
Yes, and what output you’ll be send?
– IF MPX then Juli@ cannot help you since it’s 96kHz @ optical output, or your convertor supports SPDIF? Juli@ at SPDIF Out IS 192kHz.
– IF L/R then yes, Juli@ is again one of best choices..
.. but that mean you’ll need to have aditional Stereo Coder at Transmitter site (?)So, as, Modulator say, Best is to send dry L/R signal trought STL and have PC with processing at transmitter site, then you can use MPX output from BBP/Juli@ directly.
We are going to send regular output (sound only, L/R), not MPX.
2 Boki, you wrote we need to have stereo coder – we have it.
But what we don’t have is any STL – I mean, any decoder yet, because we are just planning to set up a similar scheme in the future. Our studio (FM radio) is going to move to another place, far from the transmitter site, so such a scheme will be necessary. Now we are thinking about different variants, of course not too expensive, because we are a small budget radio station. So we can’t afford Optimod for 10,000 euro or more and STL for 3-4 thousand euro
Concerning how to send signal from the studio to optical fiber – i think, we have no problem at all – we are going to send it with a computer with ESI Julia onboard. But how to receive the signal on the transmitter site – this is still a question for us. I think, technically we can receive audio with another computer equipped with E-MU 1212M, which has optical input, but our transmitter is in a very far-to-reach place, it will be a problem if something wrong gets with the computer. PC with processing at transmitter site is possible but will be problematic. Maybe you could give some advice about a not expensive hardware box for decoding from optical fiber (S/PDIF, TossLink connectors) to regular analog audio?What about EMU 1212m card, is it good to work with BBP?
The reason I placed my eye on it – it has optical OUT and optical IN . Now I want to take two such cards, one will be on a transmitting computer, another on a receeving computer at the transmitter’s site. Any good or bad comments about this card?I think you might be barking up the wrong tree depending how far the transmitter is from your computer. According to the information here (http://en.wikipedia.org/wiki/TOSLINK) you will get a maximum of 100 ft. using optical audio cable. Is this far enough for your project?
No, it’s not enough – we need to transfer the audio signal for about 1 kilometer! We have a regular optical cable used for internet connections, not sumply for home audio, of course
I thought we could take the signal from soundcard’s optical out (for example, EMU 1212m or ESI Juli@), and this sound could be heard at the transmitter’s site.
So do we need some extra equipment to send sound to such a dictance, and which?You could try experimenting with sending S/PDIF through real fiber optic (glass!), and see how it works..
Sorry I don’t have any first-hand knowledge of transmitting audio over a distance of 1km. From my understanding you will need an STL (Studio Transmitter Link) and it won’t be cheap. I don’t have any recommendations but others with experience will hopefully comment.
If it is line of sight, 5gig or even 2.4gig wifi point-to-point will work, but I’m not sure if the bandwidth is sufficient.
I merged the two topics. Let’s keep this in one topic since you’re new to this sort of thing, and to help people help you better. 8)
If you already have fiber ran 1km, then you’re probably looking to setup a network of some kind. If you don’t have fiber in the ground yet, then definitely go wireless. It’s almost infinitely cheaper than running fiber, depending on what you have to run it across.
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