On Thu, Sep 27, 2012 at 06:55:08PM +0400, Anton Komarov wrote: > Hi, Martin, thanks for reply. > > In Audacity i see only gray background and no signal. > > Actually i have started with nbfm reciever and tried to save audio in > wav file. That i tried to redirect it to audio sink and audio was ok. > Than i tried to use very simple scheme with audio source to wav sink > and realize that wav file is broken. > > I do not think it is good when soxi not shoing time length for the > file - that means file is broken.
Are you making sure the flow graph is terminated correctly? If you simply kill the flow graph, the WAV block has no chance to write a correct file header. This happens in the block destructor, or when you call close(). If you can't do that, you must use gr_file_sink. MB > > On Thu, Sep 27, 2012 at 6:42 PM, Martin Braun (CEL) > <martin.br...@kit.edu> wrote: > > Hi Anton, > > > > I'd rather look if your audio source is producing the correct samples. > > > > On Thu, Sep 27, 2012 at 12:51:20AM +0400, Anton Komarov wrote: > >> i construct very simple scheme Audio Source --> Wav Sink > >> gr generates non-null wav file > >> -rw-rw-r-- 1 anton anton 24M сент. 27 00:46 freq2.wav > > > > Looks good. > > > >> $ soxi freq2.wav > >> > >> Input File : 'freq2.wav' > >> Channels : 1 > >> Sample Rate : 44100 > >> Precision : 16-bit > >> Sample Encoding: 16-bit Signed Integer PCM > > > > Looks good, too. > > > >> e.g. > >> soxi info on good wav file > >> > >> $ soxi arecord.wav > >> > >> Input File : 'arecord.wav' > >> Channels : 1 > >> Sample Rate : 8000 > >> Precision : 8-bit > >> Duration : 00:00:02.38 = 19000 samples ~ 178.125 CDDA sectors > >> File Size : 19.0k > >> Bit Rate : 64.1k > >> Sample Encoding: 8-bit Unsigned Integer PCM > >> > >> look at Sample Encoding - it is Signed for gnuradio and Unsigned for all > >> others. > > > > You're comparing 16- with 8-Bit. They're different. > > > > Check the WAV file with Audacity. You can also connect the WAV sink to a > > signal source for further tests. > > > > M > > > > -- > > Karlsruhe Institute of Technology (KIT) > > Communications Engineering Lab (CEL) > > > > Dipl.-Ing. Martin Braun > > Research Associate > > > > Kaiserstraße 12 > > Building 05.01 > > 76131 Karlsruhe > > > > Phone: +49 721 608-43790 > > Fax: +49 721 608-46071 > > www.cel.kit.edu > > > > KIT -- University of the State of Baden-Württemberg and > > National Laboratory of the Helmholtz Association > > > > _______________________________________________ > > Discuss-gnuradio mailing list > > Discuss-gnuradio@gnu.org > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio -- Karlsruhe Institute of Technology (KIT) Communications Engineering Lab (CEL) Dipl.-Ing. Martin Braun Research Associate Kaiserstraße 12 Building 05.01 76131 Karlsruhe Phone: +49 721 608-43790 Fax: +49 721 608-46071 www.cel.kit.edu KIT -- University of the State of Baden-Württemberg and National Laboratory of the Helmholtz Association
pgpewqGtVp7UJ.pgp
Description: PGP signature
_______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
