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[Discuss-gnuradio] Latency on TX for low data rate systems

From: Eugene Grayver
Subject: [Discuss-gnuradio] Latency on TX for low data rate systems
Date: Mon, 3 Dec 2007 11:31:03 -0800


I have a very low data rate FSK system (<100 bps).  The problem is the enormous latency introduced by the inter-block buffers.  (I am running in ms windows).  The buffer granularity is apparently 64kB.  I upsample/interpolate the data to around 500 kHz before sending it to hardware.  The buffers get filled up on startup from the data source, and any new data takes forever to come out. (64k/100 = 600sec!)  Is there a way to make the inter-block buffers MUCH smaller?  Or, at least make them different size depending on the actual sample rate?  What other options can anyone propose?

Eugene Grayver, Ph.D.
Aerospace Corp., Sr. Eng. Spec.
Tel: 310.336.1274

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