Hi Osmocom guys,

please consider merging the 2 attached patches.

The first patch:

added option -L to print current level values added option -c to configure de-emphasis time constant for wbfm added option -v to print verbose (debug) output added alias modulation names nbfm, nfm, wfm

now the options in detail:

option -L: "rtl_fm -L 10 -M fm": prints current level to stderr, every 10th calculation. This allows monitoring of the noise (or signal) level, to help setting an optimal squelch threshold.

option -c: "rtl_fm -M wbfm -c 50" uses de-emphasis time constant for europe. One might also write "-c us" to use the north american 75 microSec standard. "-c eu" will use the european 50 microSec standard.

option -v: "rtl_fm -v 1 -f 99.3M" displays verbose debug information on calculation of frequency, so that user might understand how/what frequency is tuned to.

modulation names: found myself writing "wfm" instead of "wbfm". now the aliases are also accepted.

The second patch:

added dc filter on raw data (after decimation) with option "-E rdc" added option "-q" for setting averaging speed for "rdc" added option "-E adc" in addition to "-E dc"

Please have a look in my previous mail with subject "rtl_fm: degraded demodulation caused by self-introduced DC !?" to understand the reason for a second dc filter.

kind regards, Hayati

Am 18.07.2015 um 16:26 schrieb Marcus Müller:

Hi Hayati,

I'm pretty sure git.osmocom.org is the upstream; to ask steve-m to merge your changes into his repository, just log on to github, go to https://github.com/hayguen/librtlsdr, and you should see something like "This branch is 2 commits ahead of steve-m:master Pull Request" right at the top, just under the header where you can select your branch.

The Impressum of osmocom.org said to send in patches via this mailing list, so that's what I did once, and that worked too :), so assuming steve-m's repo is called "steve-m" in your git ("git remote -v" will tell), and the modified master branch being currently checked out

git format-patch steve-m/master

will generate a patch file for each commit between your master's HEAD and steve-m/master.

Greetings, Marcus

On 18.07.2015 16:06, Hayati Ayguen wrote:

...

Hi,

just wanted to ask, what to do, so that my changes on https://github.com/hayguen/librtlsdr get merged into https://github.com/steve-m/librtlsdr ?

Just now, in this moment, i realize, that there's alos git://git.osmocom.org/rtl-sdr.git referenced at http://sdr.osmocom.org/trac/wiki/rtl-sdr

Ok, which is the real origin for rtl-sdr? What is needed to get the changes there?

Besides the changes on rtl_fm i've developed a small tool, i called "stdin2wav". It's used by piping rtl_fm's output into stdin2wav, which then saves the output into wave files using libsndfile. Besides saving, it can be combined with the squelch function of rtl_fm. stdin2wav closes the wave file when no more data comes from stdin .. and re-opens a new wave file when new data arrives, cause the squelch opened ..

Can/should this small tool also merged to rtl-sdr? Someone has a better place? By the way: someone has a better name?

kind regards, Hayati