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 Post subject: Raspberry Pi?
PostPosted: Fri Jan 01, 2016 7:11 pm 

Joined: Tue Nov 03, 2015 3:16 am
Posts: 4
I noticed the version now available for Raspberry Pi, and it intrigued me for potential broadcast use for FM. Was wondering if a Raspberry pi is capable of 192khZ and generating stereo and RDS?


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 Post subject: Re: Raspberry Pi?
PostPosted: Fri Jan 01, 2016 8:40 pm 
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Joined: Tue Mar 17, 2009 2:56 pm
Posts: 3322
Best way is to check what sound chip is on board.

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 Post subject: Re: Raspberry Pi?
PostPosted: Sat Jan 02, 2016 12:22 pm 
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Posts: 9500
Not with the on-board sound chip, but there are others that you can use. In fact, some people have even managed to write an exciter including stereo/rds encoding for it (the output is a square wave though, so you'll be heard on many frequencies).

Clipping is a different issue though, because clipping requires oversampling it seems to be too heavy (at least in my current implementation). But Stereo/RDS encoding can definitely run on it.


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 Post subject: Re: Raspberry Pi?
PostPosted: Sat Jan 02, 2016 3:36 pm 

Joined: Sun Jan 04, 2009 2:54 pm
Posts: 149
Location: Finland
Yeah, I think that you could use the RPi as a transmitter, and input the MPX to it over the network. I would love to try that but I don't know C at all. You could put an bandpass filter in front of the transmitting pin, and after that the output wont be square anymore ;)


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 Post subject: Re: Raspberry Pi?
PostPosted: Sun Jan 03, 2016 12:34 pm 

Joined: Sun Jan 03, 2016 12:29 pm
Posts: 17
Hi. Do you think a command-line version of the RPi ST is easy to compile?

I am thinking of testing the Rpi as a "last mile" final processor for a FM network in Ukraine, and even with the limited number of processing/filters possible, the ST would still do the job. However, I would prefer to integrate the ST into the existing script, which is not possible with the standalone version.

Best regards,

Christo


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 Post subject: Re: Raspberry Pi?
PostPosted: Sun Jan 03, 2016 1:37 pm 
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Joined: Mon Mar 17, 2008 1:40 am
Posts: 9500
Quote:
Hi. Do you think a command-line version of the RPi ST is easy to compile?

I am thinking of testing the Rpi as a "last mile" final processor for a FM network in Ukraine, and even with the limited number of processing/filters possible, the ST would still do the job. However, I would prefer to integrate the ST into the existing script, which is not possible with the standalone version.

Best regards,

Christo
Do you need a version with Jack support? If not it's easy.


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 Post subject: Re: Raspberry Pi?
PostPosted: Sun Jan 03, 2016 6:57 pm 

Joined: Sun Jan 03, 2016 12:29 pm
Posts: 17
Quote:
Quote:
Hi. Do you think a command-line version of the RPi ST is easy to compile?

I am thinking of testing the Rpi as a "last mile" final processor for a FM network in Ukraine, and even with the limited number of processing/filters possible, the ST would still do the job. However, I would prefer to integrate the ST into the existing script, which is not possible with the standalone version.

Best regards,

Christo
Do you need a version with Jack support? If not it's easy.
I assume I can use fifo in.pcm/out.pcm instead of actual Jack. At least I was able to work it this way on the linux command line, avoiding Jack.


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 Post subject: Re: Raspberry Pi?
PostPosted: Sun Jan 03, 2016 9:03 pm 
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Joined: Mon Mar 17, 2008 1:40 am
Posts: 9500
Ok I should be able to do that tomorrow. Please remind me if I forget!


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 Post subject: Re: Raspberry Pi?
PostPosted: Sun Jan 03, 2016 9:09 pm 

Joined: Sun Jan 03, 2016 12:29 pm
Posts: 17
Quote:
Ok I should be able to do that tomorrow. Please remind me if I forget!
You bet I will :)

thanks so much.


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 Post subject: Re: Raspberry Pi?
PostPosted: Mon Jan 04, 2016 5:02 pm 

Joined: Sun Jan 03, 2016 12:29 pm
Posts: 17
Quote:
Ok I should be able to do that tomorrow. Please remind me if I forget!
Hi again, Hans.

just reminding you, as promised :mrgreen:

best regards

Christo


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