synchronizing sound cards in a cluster
James.P.Lux at jpl.nasa.gov
Thu Mar 13 14:56:19 EST 2003
Anybody have any good ideas on how to synchronize the sampling from
multiple sound cards in a cluster using Ethernet as the interconnect. The
application would grab data from the sound card (notionally at 100
ksamples/second total, for two channels) and do a ton of signal
processing. At some point in the processing, the streams of data need to
be shared between processors (i.e. to do beamforming), and so, needs to be
The bandwidth isn't a real challenge here (with, say, 16 processors, that's
only about 32 Mbps total), nor is latency, but synchronization is.
One can fairly easily synchronize to a millisecond over Ethernet, but this
application needs sync to, at worst, 1 sample time (20 microseconds)
although order of a microsecond would be nice.
James Lux, P.E.
Spacecraft Telecommunications Section
Jet Propulsion Laboratory, Mail Stop 161-213
4800 Oak Grove Drive
Pasadena CA 91109
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