[mythtv-users] Audio - hiss

Scott Croft scott.croft at cox.net
Sat Mar 11 03:42:38 UTC 2006


I have come to the end of all I can think of to fix the high pitched hiss in
the audio of my real time or playback of myth TV.  I am using an old
Hauppauge WinTV card and have the audio out jack on the TV card ran back
into the line in of my on board Nvidia audio card.  Have set and tried all
the combinations I can think of in the alsamixer control.  I currently have
all settings muted and turned down with the exception of Master 70%/on, PCM
70%/on, LineIn 0%/muted, Capture 0%.  I can listen to the audio out jack on
the TV card with headphones and the sound is fine.  I can feed an Ipod audio
into the loop cable plugged into the onboard audio line-in and it works fine
with myth into my TV with no hiss.  I have added a "magnet filter" to the
audio patch line to try to eliminate the noise with no change.  I have
switched the power to the PC to another circuit in the house.  Have moved
the TV card to another PCI slot, and replaced the TV card with an extra
identical one.  Nothing seems to work.  The hiss "volume" seems to follow
any of the volume controls up and down.  Any help or suggestions would be
greatly appreciated.

Thanks,
Scott



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