ADAU1442 SPDIF Lock Bit

Hi,

When connecting a SPDIF Signal to the ADAU1442 the first time after power on there is a nasty click.

Question: Is it possible to access the SPDIF Lock Bit ( Reg 0xE0C9) from inside the ADAU1442 program to trigger a delayed UnMute ?

Bernd

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  • 0
    •  Analog Employees 
    on Jun 19, 2013 5:45 PM

    Hi Bernd,

    Will the S/PDIF source be "hot-plug" in your system, meaning that the user can plug it in and out at any time?

    Any time there is a discontinuity in a signal, there will be an associated pop sound. So, if the S/PDIF source can be hot-plugged, this is kind of unavoidable.

    The S/PDIF lock bit cannot be read from the DSP core itself.

    However, you could do some smart auto-muting if the signal is not present on the input.

    Perhaps something like this would work. It uses a DC blocker and peak envelope on the input to detect if the signal is present, and uses a slew volume control to un-mute the signal when it appears.

Reply
  • 0
    •  Analog Employees 
    on Jun 19, 2013 5:45 PM

    Hi Bernd,

    Will the S/PDIF source be "hot-plug" in your system, meaning that the user can plug it in and out at any time?

    Any time there is a discontinuity in a signal, there will be an associated pop sound. So, if the S/PDIF source can be hot-plugged, this is kind of unavoidable.

    The S/PDIF lock bit cannot be read from the DSP core itself.

    However, you could do some smart auto-muting if the signal is not present on the input.

    Perhaps something like this would work. It uses a DC blocker and peak envelope on the input to detect if the signal is present, and uses a slew volume control to un-mute the signal when it appears.

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