create an fsk signal
Hi all
I would like to be able to sync my Roland MC-50 (sequencer) with MSP. The MC-50 has an input for tape sync that looks for an FSK signal (according to the manual). Does anyone know how to create this signal in MSP?
I'm pretty sure it involves signals at 1200 Hz and 2400 Hz, but I can't find anything else that I can make sense of.
I want to do it this way so that I can drive the system off of jhno's phasor-metronome, and in turn sync sample loops with incoming midi data from the MC-50.
Thanks in advance.
David
A quick web search finds that the MC-50 uses "smart fsk", or "FSK
II", which is FSK plus song position pointers.
I didn't find a technical document on quick search, but there's
enough clues out there in what I did find to at least get you
started. Does the MC-50 have a sync output? If so, then you can
analyze the output, and sort of reverse engineer things a bit... like
I did with 202 Hack:
Dan
At 10:27 PM -0500 2/1/07, David Morneau wrote:
>Hi all
>
>I would like to be able to sync my Roland MC-50 (sequencer) with
>MSP. The MC-50 has an input for tape sync that looks for an FSK
>signal (according to the manual). Does anyone know how to create
>this signal in MSP?
>
>I'm pretty sure it involves signals at 1200 Hz and 2400 Hz, but I
>can't find anything else that I can make sense of.
>
>I want to do it this way so that I can drive the system off of
>jhno's phasor-metronome, and in turn sync sample loops with incoming
>midi data from the MC-50.
>
>Thanks in advance.
>
>David
>--
>------
>http://5of4.com
--
Dan Nigrin
Defective Records
202 Hack / PC-1600 User / VSTi Host / OMS Convert / Jack OS X / Major
Malfunction
http://www.defectiverecords.com
http://www.jackosx.com
Hi Dan
Thanks for the reply. I looked for more FSK info online and didn't find much. I also reread your earlier thread about decoding and fsk signal.
I did record the MC-50's FSK output, but I'm not sure how to begin figuring out what to do to recreate it. This sort of DSP programming is over my head.
At this point I probably won't worry too much about using the MC-50 for my current project. There are many threads dealing with sync issues, but nothing that I could apply to this particular case. Rather than spending more time that I don't really have, I'm going to make the whole thing work from within MSP and not worry about the external hardware.
Of course, if you (or anyone else) has an idea that won't take me more than a couple of hours to implement I'd love to hear it.
Take care
David
At 2:32 PM -0500 2/2/07, David Morneau wrote:
>Hi Dan
>
>Thanks for the reply. I looked for more FSK info online and didn't
>find much. I also reread your earlier thread about decoding and fsk
>signal.
>
>I did record the MC-50's FSK output, but I'm not sure how to begin
>figuring out what to do to recreate it. This sort of DSP programming
>is over my head.
Basically, you should create and save multiple audio files of the FSK
output, each varying the tempo of the MC50. Then view the audio
files in an audio editor - you should be able to do some analysis
around how the files are different at different tempos. I'm pretty
sure standard FSK just toggled the frequency at every clock tick;
what I don't know in Smart FSK is how the song position got embedded
in the signal.
>At this point I probably won't worry too much about using the MC-50
>for my current project. There are many threads dealing with sync
>issues, but nothing that I could apply to this particular case.
>Rather than spending more time that I don't really have, I'm going
>to make the whole thing work from within MSP and not worry about the
>external hardware.
>
>Of course, if you (or anyone else) has an idea that won't take me
>more than a couple of hours to implement I'd love to hear it.
If you don't care about the song position stuff, you might be able to
just send the MC50 straight FSK (basically alternating the two
frequencies at every clock tick, or maybe beat tick), and it might
work. Not sure! If you want to include the song position stuff,
unless someone comes forward with how Smart FSK works, that might
take you more than a few hours!
Good luck - please report back if you try it...
Dan
--
Dan Nigrin
Defective Records
202 Hack / PC-1600 User / VSTi Host / OMS Convert / Jack OS X / Major
Malfunction
http://www.defectiverecords.com
http://www.jackosx.com
You shoud try here
Show-Control@yahoogroups.com
people that hang out there should know about this stuff.
klif