On 06/05/2015 15:22, Игорь Ч wrote:
Dear Sirs:
Hi Igor,
I have just found with Asus Xonar U7 USB sound card DT is by
approximately 0.3 greater than with USB Sound Blaster:
Sound Blaster:
1300 -4 0.6 1327 # AK1P GM4SQM -15
1300 -8 0.1 1782 # IC8DAK UN7GBY MN83
1301 -3 0.3 1414 # R9MR DH1BBH -19
1301 -1 0.6 1780 # UN7GBY IC8DAK -11
----------------------------------------
XONAR U7:
1303 -7 0.6 1399 # R9MR DH1BBH -19
1303 -1 0.9 1761 # UN7GBY IC8DAK RR73
1304 -2 0.8 1313 # CQ GM4SQM IO75 Scotland
1304 -8 0.4 1761 # IC8DAK UN7GBY 73
While Xonar U7 has 10..15 dB better noise floor there are
approximately 30 to 50% signals that are clearly seen in the waterfall
are not decoded while using Xonar U7, and I suspecting the sound card
processing delay is the issue. Tested it with WSJT-X r5133 version.
It is unlikely that a time delay of less than one second will impact
decoding significantly, especially if your PC clock is accurate. How is
your PC clock synchronized and do you have the capability of measuring
any time offset?
One possible source of audio latency is any re-sampling done by the
operating system, this can be eliminated by ensuring that the default
sample for the sound card is 48 kHz. Older versions of MS Windows like
XP and Vista are particularly poor at re-sampling audio streams.
Xonar U7 works with Asus drivers, Microsoft drivers do not support
this sound card.
I wonder if it possible to let user compensate sound card delay in the
settings?
Best regards,
Igor UA3DJY
73
Bill
G4WJS.
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