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Ron Senykoff rsenykoff at gmail.comMy experience was that several commands / examples I've seen gave me stutters here on a pretty beefy computer. It took playing around and I didn't document everything, but so far what I've got that 'works' stutter-free, although maybe is not so great... but it does work anyways. I know it isn't a rasbpi but it showed me that a lot of times it isn't the hardware causing the stutters. ron at tripel:~$ rtl_fm -W -f 96.9e6 -W -s 200000 -r 48000 - | aplay -r 48k -f S16_LE -t raw -c 1 Found 1 device(s): 0: Generic, RTL2832U, SN: 77771111153705700 Using device 0: Generic RTL2832U (e.g. hama nano) Found Rafael Micro R820T tuner Oversampling input by: 2x. Oversampling output by: 4x. Buffer size: 5.12ms Tuned to 97315000 Hz. Sampling at 1600000 Hz. Output at 48000 Hz. Tuner gain set to automatic. Playing raw data 'stdin' : Signed 16 bit Little Endian, Rate 48000 Hz, Mono On Thu, Nov 29, 2012 at 1:28 PM, keenerd <keenerd at gmail.com> wrote: > On 11/29/12, Pete Zaitcev <zaitcev at kotori.zaitcev.us> wrote: > > But another thing is that rtl_fm just won't work until the signal is > > strong enough. > > Maybe you should try increasing the gain. > > > Final command line was this: > > rtl_fm -l 0 -f 99.5e6 -N -s 170e3 -o 4 -A -r 24e3 - | \ > > aplay -r 24k -f S16_LE -t raw -c 1 > > Really, much smarter to use -W instead. You are losing a moderate > amount of the signal. First, wbfm is slightly off center pushing 10% > of the signal out of range. Second, it carries audio information up > to 16kHz and resampling at 24ks/s discards another 25%. > > rtl_fm -W -f 99.5e6 -g 49 | aplay -r 32k -f S16_LE -t raw -c 1 > > will work better. No reason to spell it out the long way. > > -Kyle > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/osmocom-sdr/attachments/20121130/08edad64/attachment.htm>