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Changing audio levels in SO2R

Tim K9WX
Tim K9WX Member ✭✭✭
edited June 2020 in SmartSDR for Windows

Answers

  • Andy - KU7T
    Andy - KU7T Member ✭✭
    edited May 2020
    Very good write up and explanation of your test method. I am having the same feeling when switching audio from 1 to 2 ears. I have always thought it's just easier to copy with 2 ears. Whether this is a bug somewhere or just a normal result of audio mixing, I hope this could be adjusted so the level is the same. 73, Andy KU7T
  • Kari Gustafsson SM0HRP
    Kari Gustafsson SM0HRP Member ✭✭
    edited May 2020
    This effect is called binaural summation. Tests have showed that you win some 2-3 dB listening in stereo with both ears than just one ear. It is very evident in SO2R operating.
  • Andy - KU7T
    Andy - KU7T Member ✭✭
    edited June 2020
  • Joel N9LQ
    Joel N9LQ Member ✭✭
    edited June 2020
    I have noticed the same thing as Tim.  An easy way to see the effect is to just put on one half of your headphones and put the other earpiece on the top of your head.  As you switch to stereo, the ear that you are listening with gets louder.  I think this is not very good for SO2R operations.  I agree it would be good to be able to adjust this effect out.  73, Joel N9LQ
  • Eric-KE5DTO
    Eric-KE5DTO Administrator, FlexRadio Employee admin
    edited June 2020
  • Andy - KU7T
    Andy - KU7T Member ✭✭
    edited June 2020
  • Tim K9WX
    Tim K9WX Member ✭✭✭
    edited June 2020
    I have only noticed the change in audio levels when using N1MM+, where I use the tilde key (~) to go from stereo to mono and back to stereo.  So the change is, in effect, instantaneous, without the delay that might be associated with adjusting the sliders.  As Andy KU7T suggests, there is an OTRSP port involved.

    Tim K9WX
  • Eric-KE5DTO
    Eric-KE5DTO Administrator, FlexRadio Employee admin
    edited June 2020
    When you notice the change, is there a Slice coming or going?  I ask because there is scaling that happens as a result of how many Slices are in use (and whether or not they are muted).
  • Andy - KU7T
    Andy - KU7T Member ✭✭
    edited June 2020
    When I use this, I have 2 slices and they are staying. OTRSP just switches the audio.

    Andy
    KU7T
  • Eric-KE5DTO
    Eric-KE5DTO Administrator, FlexRadio Employee admin
    edited June 2020
    Is it muting one of the Slices?
  • Tim K9WX
    Tim K9WX Member ✭✭✭
    edited June 2020
    Eric: Not sure if the question about a slice coming or going was directed at me.  But my SO2R setup would typically have two slices open and they remain open throughout.  When listening in stereo, both slices have the audio turned on.  When I use the ~ key in N1MM to switch to mono so that I have the same slice in both ears, the other slice becomes muted (shows the little red circle with the slash mark on top of the speaker icon for that slice in SSDR).
  • Eric-KE5DTO
    Eric-KE5DTO Administrator, FlexRadio Employee admin
    edited June 2020
    The muted slice would explain this.  We will revisit the decision about whether to include a muted Slice in our contributing Slice calculation.  Thanks for the info.

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