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LMH1981: Genlock and Timecode function block diagram review

PYTsai
Genius 12350 points

Part Number: LMH1981

Hi 

My customer want to implement Genlock and Timecode function. they are thinking of below block diagram. can you help reveiw if it looks ok ? 

1.jpg

  • 0
    TI__Guru** 121000 points

    Hi PY,

    Like this? Yes, genlock is ok. However, I don't know what is timecode.

  • +1 in reply to Noel Fung
    Intellectual 711 points

    Hi PY and Noel,
    The proposed diagram is only for video clock synchronization.

    Timecode is the time of day and (optional) date serial signal.
    In case of video (tape/timeline) clip, the timecode contains the absolute clip time.

    It can be linear modulated or encoded as video pixels outside visible area.
    The first can be transported over audio connection, the latter can be transported over the video channel.
    These are modulated signals, so they must be demodulated and decoded to become usable.


    Defined by SMPTE 12M protocol

    Regards,
    Octo

  • 0 in reply to Octo Halsema
    Prodigy 10 points

    Hi Octo,

    Do you know how to accomplish the timecode function on hardware circuit design ?

    As i know that the timecode signal/format can be generated from MCU/SoC and go through DAC to output analog audio signal to next device for time align.

    Regards,

    Jerry

  • 0 in reply to jerrysh wu
    Intellectual 711 points

    Hi Jerry,

    I think LTC reading and generating with a SoC is the easiest way.
    I don't know of a complete LTC chip, and it needs to be configured by a controller anyway.

    I have good experience with libltc + ltctools for chrony in combination with PTP

    Regards,
    Octo