• Status Closed
  • Percent Complete
  • Task Type Bugs
  • Category Music playback
  • Assigned To No-one
  • Operating System Sansa Fuze+
  • Severity Low
  • Priority Very Low
  • Reported Version Release 3.10
  • Due in Version Undecided
  • Due Date Undecided
  • Votes
  • Private
Attached to Project: Rockbox
Opened by returno - 2011-12-31
Last edited by saratoga - 2012-01-03

FS#12501 - stereo width - not working as documented - 3.10 - Sansa Fuze v1

I have a Sanza Fuze V1. I'm using 3.10.

I made a stereo recording that has sound only on the left channel - this verified in Audacity. There is zero sound on the right. (Why I won't go into, but it is part of a larger project where some part of the recording with be on either the left or right or both)

I want to hear the recording such that there is only sound on my left-hand earbud. I go to "channel configuration" and choose "custom". Then, I go to "stereo width". Here is where things seem to not be working according to the documentation. I was expecting this:

0% = mono, equal volume on both ear buds
100% = same as "stereo" setting - a little sound in the right earbud, left has normal sound
250% = no sound on the right earbud, left has normal sound

What I hear is:

0% = mono
95% = a tiny amount of sound on the right ear bud
100% = same as "stereo" - a bit of sound on the right ear bud - more than at 95%
…going up = more and more sound on the right earbud (???)
250% = about the same as 0% (???)

There is no setting where there is zero sound on the right earbud, which is necessary for my project to work correctly, unfortunately.

Closed by  saratoga
2012-01-03 23:04
Reason for closing:  Not a Bug

The behaviour is correct – except the small amount of signal on the right ear-plug when setting stereo width to 100%. This is not caused by the stereo width setting (I just checked the maths) but by either some other sound processing or any electrical issue.

Why the behaviour is correct: The stereo width setting mixes L and R input signals to L and R output signals. Only 100% keeps the "pure" L/R untouched. Settings below 100% will result in mixing L signal parts into the R channel (and vice versa), settings above 100% will result in mixing *inverted* L signal parts into the R channel (and vice versa). Mixing together L and R w/o inversion will reduce the stereo image, mixing with inversion will widen the stereo image.

As you play with a signal which only has L signal, all settings above or below 100% will result in raising signal on the R channel.

I will close this bu report in a few days.


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