[pulseaudio-tickets] [Bug 46236] Microsoft LifeChat LX-3000 USB Audio Headset DB issue with Volume Scale

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=46236

--- Comment #19 from Raymond <superquad.vortex2 at gmail.com> ---
http://en.wikipedia.org/wiki/Audio_bit_depth

24-bit digital audio has a theoretical maximum SNR of 144 dB, compared to 96 dB
for 16-bit

Signal-to-noise ratio and resolution of bit depths# bits    SNR    Possible
integer values    Base ten signed range
4    24.08 dB    16    −8 to +7
8    48.16 dB    256    −128 to +127
16    96.33 dB    65,536    −32,768 to +32,767
20    120.41 dB    1,048,576    −524,288 to +524,287
24    144.49 dB    16,777,216    −8,388,608 to +8,388,607
32    192.66 dB    4,294,967,296    −2,147,483,648 to +2,147,483,647
48    288.99 dB    281,474,976,710,656    −140,737,488,355,328 to
+140,737,488,355,327
64    385.32 dB    9,223,372,036,854,775,807    −4,611,686,018,427,387,903 to
+4,611,686,018,427,387,902

the volume control of livechat is about 4 bit while the volume control is just 
16 bit plus -inf

are your livechat confine to USB audio 1.0 or 2.0 ?

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/pulseaudio-bugs/attachments/20131030/b7e6ede8/attachment.html>