[linux-dvb] cx88-alsa audio quality?

Vanessa Ezekowitz vanessaezekowitz at gmail.com
Mon Sep 29 08:01:51 CEST 2008

I forget if I've already mentioned this yet...

I recently started playing around with analog NTSC television again on my system, while trying to help someone solve a problem on their system.  In the process I ran into a problem getting cx88-alsa to build with the rest of the v4l-dvb repository.  As it turned out, mine was one of the stock Ubuntu kernels that have some odd issue with the I2C configuration.   I had to build a vanilla kernel (, making all the I2C stuff into modules as opposed to built-in.  So, that's fixed - cx88-alsa builds and loads OK now.

However, I have a new problem:

Something has broken the output that cx88-alsa creates.  In the case of my Kworld ATSC 120, radio output on all frequencies has a sort of growling "industrial" noise on top of the actual audio, kinda like the background noise of a manufacturing facility.

Analog TV on all channels gives clean but very tinny audio, as though the sample rate were really low (~8kHz).

Since other audio sources are working fine, I can't tell if this is a bug in the kernel, or cx88-alsa, or something else entirely.  I've only noticed the problem for a matter of a week or less, so I'm not sure when it started.  The problem persists as of today's pull of the v4l-dvb repository.

"Life is full of positive and negative events.  Spend
your time considering the former, not the latter."
Vanessa Ezekowitz <vanessaezekowitz at gmail.com>

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