Raph Francois

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10 years, 7 months ago.

May I Plug an audio source (like out of an Ipod) directely to the ADV IN ?

Or may I have to use some electronics ?

I don't know if MBED can read negatives values of the audio signal from an cd player or other audio component.

My goal is to realize an SMPTE LTC reader/generator.

Thanks a lot if you can help me.

Raph

2 Answers

Reed Kimble
10 years, 7 months ago.

Pretty sure you'll need a circuit to condition that signal for you or you'll fry your mbed pins...

You might want to source some DSP chip that you can interface with via UART or SPI/I2C bus and let it worry about turning the analog signal into something you can work with digitally.

Raph Francois
poster
10 years, 7 months ago.

/media/uploads/Grag38/arduino-simple-timecode-input.jpg

If I want to read only positive pulses from an square biphase signal from smpte ltc timecode, will this schema works on an digital input pin of the LPC ?

Thanks

Raph

Using the /media/uploads/Grag38/arduino-simple-timecode-input.jpg schema allows me to decode SMPTE Time code with an 1768 Board.

Then I translate it to midi time code trough an RTSP protocol like TC`2TR product from kissbox does.

(http://www.kissbox.nl/products_new.html).

I really works fine.

If someone is really enjoy with things around SMPTE LTC<->MIDI MTC and RSTP protocol, I can help.

Best Regards

Raph

posted by Raph Francois 27 Dec 2013