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From: | John Ackermann N8UR |
Subject: | [Discuss-gnuradio] Mixing multiple streams to audio |
Date: | Tue, 23 May 2017 14:31:18 -0400 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.7.0 |
Hi --I'm continuing to work on a multi-channel NBFM receiver using the polyphase filter. I have the basic system working, but am hung up on how to get audio out of the system; most of my attempts end up either with audio underruns, or stalls that result in overruns.
The relevant portion of the flowgraph is attached. Each channel ends up at a 15ksps rate and is fed into a power squelch, then a mult block that's used to mute or unmute the audio, then NBFM demod. The demodulated outputs are at 7.5ksps (though I get the same results with 15ksps) and the seven channels are added. Then a rational resample to 48ksps, volume control, and audio sink at 48ksps.
I've tried the "gate" param of the power squelch block both off and on, and the "OK to block" option of the audio sink in various combinations, but I'm not able to get clean audio.
I'd appreciate any suggestions. One thing I wonder about is the placement of the blocks in the stream; would a different order work better?
Thanks for any assistance. John
n8ur_multi_rx.png
Description: PNG image
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