https://bugs.freedesktop.org/show_bug.cgi?id=95506
Bug ID: 95506
Summary: Feature request: always refilter LFE on laptops, even
if already present
Product: PulseAudio
Version: unspecified
Hardware: Other
OS: All
Status: NEW
Severity: normal
Priority: medium
Component: core
Assignee: pulseaudio-bugs@lists.freedesktop.org
Reporter: patra...@gmail.com
QA Contact: pulseaudio-bugs@lists.freedesktop.org
CC: lenn...@poettering.net
Some laptops have an internal subwoofer. The correct corner frequency for the
crossover filter to be used with such subwoofer is, let's say, 700 Hz.
Definitely not 120 Hz.
Let's see what happens if the user sets lfe-crossover-freq to 700, and then
listens to (2.0) music and watches a film witha 5.1 soundtrack.
Music doesn't have the LFE channel, so PulseAudio will synthesize it
(correctly, except for the overall gain, which is tracked as bug #95021).
Frequencies below 700 Hz will be sent to the subwoofer, frequencies above that
will be sent to the main channels. So all is good.
A film soundtrack does, however, have an LFE channel. But it is intended to be
played on home cinema hardware, where the crossover frequency is 120 Hz. So,
the original soundtrack has some content between 120 and 700 Hz in main
channels. PulseAudio will leave it there, because it refuses to remix LFE if it
is already there. Result: tinny sound, because the subwoofer is essentially
unused.
--
You are receiving this mail because:
You are the QA Contact for the bug.
You are the assignee for the bug.
_______________________________________________
pulseaudio-bugs mailing list
pulseaudio-bugs@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/pulseaudio-bugs