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TAS5754M DRC

Kevin Groeneveld
Prodigy 100 points
Other Parts Discussed in Thread: TAS5710, TAS5754M

The HybridFlow 3 block diagram (and I think most of the other HybridFlows) in the "Using the TAS5754/6M HybridFlow Processor User Guide" shows the “Output Volume” control after the “DRC” block. This results in the DRC compressing the signal based on the input level. If the input level is loud the signal will be compressed even when the output volume is set low.

Is there a way to put the DRC after the volume control? For example, the TAS5710 has the DRC after the volume control which seems to make a lot more sense.


Thanks,

Kevin

  • 0
    TI__Guru**** 189401 points

    Hi, Kevin,

    Unfortunately, no, there is no way to change the order of the blocks in the TAS5754M/6M.

    But, shouldn't the input level be constant? Why would it be changing? Shouldn't you be using the TAS5754M/6M as your volume control?

    -d2

  • 0 in reply to Don Dapkus
    Prodigy 100 points
    Hi Don,

    Thanks for the feedback.

    The input gain may be constant but the level at any given point in time is not. Some music is recorded at a lower level than other recordings. There are quiet and loud passages within the same recording. There are many other reasons why the input level may vary.

    If the input level, or at least the peaks, were generally more constant I probably wouldn’t even want to enable the DRC, I would just set the maximum volume the user could select to avoid clipping. However to allow the user to still get to max output power on a quiet recording some headroom is required in the volume control. But then it would be nice to be able to use the DRC to avoid clipping when the recording is at a more normal level and the user turns the volume up to max anyway.

    Another way of looking at it is that I want the DRC to only possibly engage when the volume is set near max. If the user turns down the volume I want the DRC to stop having an impact. This can only work if the volume control is before the DRC block such as in the TAS5710 (or maybe by adjusting the DRC parameters relative to the volume control setting).


    Kevin
  • 0 in reply to Kevin Groeneveld
    TI__Guru**** 189401 points
    Hi, Kevin,

    Sorry for the delay!

    I have provided your feedback to our Systems Engineer for potential consideration in the next family of devices.

    Thank you for the feedback!

    -d2