Hi Markus and group,
Am 10.05.2011 15:59, schrieb Markus Vester:
Hi there,
I think Wolf's idea is to lock to 1 pps pulses from the
GPS, and use the NMEA data to uniquely identify the second of
each pulse. This will allow SpecLab to brigde data outages or
sound buffer overflows on receive.
Exactly, that's one of the motivations. You will need a GPS receiver
with NMEA *and* sync pulse ("pps") output. Both signals are added
with a passive combiner, fed into the soundcard, and the software
does the rest. The timing jitter for the NMEA strings doesn't matter
at all.
Markus wrote:
I do not know if that technique could be used to
stabilize sound output for transmitting as well. One would
probably have to monitor the output, and then apply phase
corrections if necessary.
Yes, the problem will be the unknown, and possibly not constant
'output latency' of the soundcard, and its driver software.
Cheers,
Wolf .
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