Hello, On Fri, 2019-06-07 at 12:40 +0530, Maitry Raval wrote: > Hello, > > I am using USRP-B200 mini, and as I want to use USRP offline, that's > why I am trying to record the transmitted modulated signal through > UHD USRP source to some file, Is it ok to use .txt file for this?
Again, the filename says *nothing* about a file's contents. So it's OK, it's just utterly misleading, because there's absolutely no text inside. > And the problem arise in this is , when the signal is being recorded > in a wav file through wav file sink, then the recorded wav file's > amplitude is lower than the the signal I have seen during simulation > in time sink and FFt sink. > Wait, the amplitude of the wav file saved with the wav file sink is different when you open it with a wav file source? Or how do you open it? Reminder, again: Files are *interpreted* by the reading software. GNU Radio maps -1 to +1 to the full scale of the wav file's sample format. Other software might do something else. Best regards, Marcus > With Best Regards, > Maitry Raval, > > > ----- Original Message ----- > From: "Marcus Müller, CEL" <muel...@kit.edu> > To: "maitry raval" <maitry.ra...@azistaaerospace.com> > Cc: "discuss-gnuradio" <discuss-gnuradio@gnu.org> > Sent: Friday, 7 June, 2019 06:42:44 > Subject: Re: query regarding wav file recording through wav file sink > block > > 256 kHz is not a sampling rate supported by many devices. What USRP > are > you using? > > Also, the filename doesn't matter to its content at all, so this is > fine, but using .txt for a file that contains raw binary samples is > questionable. > > So, back to your original problem: can you describe how the result of > the operation is different from what you're expecting? I still must > admit I don't get where the problem lies. > > Best regards, > Marcus > > On Fri, 2019-06-07 at 10:04 +0530, Maitry Raval wrote: > > Hello, > > > > PLease find attached flowgraph for other end of txt file writing, > > as > > I have received the transmitted signal through UHD USRP source > > block > > and record it in a text file at 256k sample rate and then this > > recorded text file is being used in next flow graph for converting > > it > > into wav file. > > > > that means I have received the modulated transmitted signal, record > > it in txt file and remove noise as well resample it to 48k in order > > to save that downcoverted signal to wav file sink. > > > > With Best Regards, > > Maitry Raval, > > > > ----- Original Message ----- > > From: "Marcus Müller, CEL" <muel...@kit.edu> > > To: "maitry raval" <maitry.ra...@azistaaerospace.com> > > Cc: "discuss-gnuradio" <discuss-gnuradio@gnu.org> > > Sent: Wednesday, 5 June, 2019 07:09:42 > > Subject: Re: query regarding wav file recording through wav file > > sink > > block > > > > we really need both your Wav writing (we've got that) and Wav > > reading > > flow graph to make any qualified statement. > > > > Again, the file name in your file source is suspicious. > > > > Best regards, > > Marcus > > > > On Wed, 2019-06-05 at 10:54 +0530, Maitry Raval wrote: > > > Hello, > > > > > > Please check the flowgraph, as there is a wav file sink at output > > > side, that record the incoming signal, but when I use that same > > > recorded wav file in wav file source and check the output in time > > > sink and FFT sink, then amplitude changes. > > > > > > With Best Regards, > > > Maitry Raval, > > > > > > > > > ----- Original Message ----- > > > From: "Marcus Müller, CEL" <muel...@kit.edu> > > > To: "maitry raval" <maitry.ra...@azistaaerospace.com> > > > Cc: "discuss-gnuradio" <discuss-gnuradio@gnu.org> > > > Sent: Tuesday, 4 June, 2019 13:01:55 > > > Subject: Re: query regarding wav file recording through wav file > > > sink > > > block > > > > > > Ok, there's no Wave file involved here; instead, you read a file > > > as > > > complex 2×3bit floating point binary that has a .txt ending. Have > > > you > > > read [1]? > > > Then, you're doing *way* more than just multiplying with a > > > constant, > > > so > > > really, I'm not sure this flow graph has *anything* to do with > > > your > > > question. > > > > > > [1] > > > https://wiki.gnuradio.org/index.php/FAQ#What_is_the_file_format_of_a_file_sink.3F_How_can_I_read_files_produced_by_a_file_sink.3F > > > > > > On Tue, 2019-06-04 at 15:17 +0530, Maitry Raval wrote: > > > > Hello, > > > > > > > > Please check the flow graph. > > > > > > > > > > > > With Best Regards, > > > > Maitry Raval, > > > > > > > > > > > > ----- Original Message ----- > > > > From: "Marcus Müller, CEL" <muel...@kit.edu> > > > > To: "maitry raval" <maitry.ra...@azistaaerospace.com> > > > > Cc: "discuss-gnuradio" <discuss-gnuradio@gnu.org> > > > > Sent: Tuesday, 4 June, 2019 08:56:22 > > > > Subject: Re: query regarding wav file recording through wav > > > > file > > > > sink block > > > > > > > > Frankly, multiplication with a constant doesn't offer any > > > > benefit. > > > > The > > > > numbers stay the same, just scaled. > > > > > > > > However, 8 bit might be the giveaway here: are you maybe trying > > > > to > > > > multiply 8 bit numbers with a constant that leads to values > > > > larger > > > > than > > > > what can be represented in 8 bits? > > > > > > > > A screenshot of your flowgraph rather than just its result > > > > would > > > > be > > > > most interesting here. > > > > On Tue, 2019-06-04 at 13:58 +0530, Maitry Raval wrote: > > > > > Hello, > > > > > > > > > > Thanks for your response. > > > > > > > > > > My requirement is to use GNU generated wav file into MATLAB. > > > > > But > > > > > when I record the wav file with 48k sample rate and 8 bits > > > > > per > > > > > sample, my recorded wavfile shows a very low amplitude > > > > > signal, > > > > > the screenshot is attached, please check. > > > > > > > > > > > > > > > With Best Regards, > > > > > Maitry Raval, > > > > > > > > > > > > > > > ----- Original Message ----- > > > > > From: "Marcus Müller, CEL" <muel...@kit.edu> > > > > > To: "maitry raval" <maitry.ra...@azistaaerospace.com> > > > > > Cc: "discuss-gnuradio" <discuss-gnuradio@gnu.org> > > > > > Sent: Tuesday, 4 June, 2019 08:02:48 > > > > > Subject: Re: query regarding wav file recording through wav > > > > > file > > > > > sink block > > > > > > > > > > I assume you do the multiplication with a constance to change > > > > > the > > > > > amplitude, and so that's right. > > > > > > > > > > A multiplication with a constant does however not change the > > > > > shape of > > > > > the signal at all, unless you're running into numerical > > > > > limits. > > > > > > > > > > We'll need more info on what exactly you're doing and what > > > > > exactly > > > > > you're seeing. > > > > > > > > > > Best regards, > > > > > Marcus > > > > > > > > > > On Tue, 2019-06-04 at 10:22 +0530, Maitry Raval wrote: > > > > > > Hello, > > > > > > And when I use multiply constant block in order to increase > > > > > > the > > > > > > amplitude of the wav file, It slightly change the amplitude > > > > > > and > > > > > > change the shape of the signal. PLease someone guide. > > > > > > > > > > > > > > > > > > With Best Regards, > > > > > > Maitry Raval, > > > > > > > > > > > > ----- Original Message ----- > > > > > > From: "Maitry Raval" <maitry.ra...@azistaaerospace.com> > > > > > > To: "Marcus Müller, CEL" <muel...@kit.edu> > > > > > > Cc: "discuss-gnuradio" <discuss-gnuradio@gnu.org> > > > > > > Sent: Monday, 3 June, 2019 10:14:11 > > > > > > Subject: Re: [Discuss-gnuradio] query regarding store > > > > > > transmitted signal > > > > > > > > > > > > Hello, > > > > > > > > > > > > PLease someone guide about wav file recording signal's > > > > > > amplitude. as I have a requirement of using GNU generated > > > > > > wav > > > > > > file to my application, but as amplitude of wav file is > > > > > > very > > > > > > low, I couldnot use that in my application. > > > > > > > > > > > > Thanks for your support in advance. > > > > > > > > > > > > With Best Regards, > > > > > > Maitry Raval, > > > > > > > > > > > > ----- Original Message ----- > > > > > > From: "Maitry Raval" <maitry.ra...@azistaaerospace.com> > > > > > > To: "Marcus Müller, CEL" <muel...@kit.edu> > > > > > > Cc: "discuss-gnuradio" <discuss-gnuradio@gnu.org> > > > > > > Sent: Monday, 20 May, 2019 05:16:52 > > > > > > Subject: Re: [Discuss-gnuradio] query regarding store > > > > > > transmitted signal > > > > > > > > > > > > Hello, > > > > > > > > > > > > there is a amplitude change in signal source and wav file > > > > > > sink(recorded wav file), please check the screenshots as > > > > > > well. > > > > > > I think, because of that when I use the recorded wav file > > > > > > as > > > > > > source for transmission, I didnot get the sucessful > > > > > > reception. > > > > > > Please guide how to record wav file with the same amplitude > > > > > > as > > > > > > signal source. > > > > > > > > > > > > Thanks for your support in advance. > > > > > > > > > > > > > > > > > > With Best Regards, > > > > > > Maitry Raval, > > > > > > > > > > > > > > > > > > ----- Original Message ----- > > > > > > From: "Maitry Raval" <maitry.ra...@azistaaerospace.com> > > > > > > To: "Marcus Müller, CEL" <muel...@kit.edu> > > > > > > Cc: "discuss-gnuradio" <discuss-gnuradio@gnu.org> > > > > > > Sent: Saturday, 18 May, 2019 08:29:16 > > > > > > Subject: Re: [Discuss-gnuradio] query regarding store > > > > > > transmitted signal > > > > > > > > > > > > Hello, > > > > > > > > > > > > Thanks for your reply. > > > > > > I have successfully record one modulated signal transmitted > > > > > > from USRP into .txt file and done demodulation offline, i.e > > > > > > of > > > > > > that stored data and receive audio from that. > > > > > > But, I have all this done with wav file which is 48k > > > > > > sampled. > > > > > > but my requiremnet is to do AM modulation of 600Hz audio > > > > > > file. > > > > > > for that, I have done the following. > > > > > > > > > > > > signal source(600Hz,8K)- wav file sink > > > > > > > > > > > > AM transmission of this wav file from USRP. > > > > > > > > > > > > record AM modulated transmitted signal in .txt file. > > > > > > > > > > > > and demodulate it in order to receive 600Hz, 8k wav file. > > > > > > during demodulation, I saw signal in scope sink and figure > > > > > > out > > > > > > frequency of that signal through FFT sink, biut when I > > > > > > record > > > > > > received 600Hz signal as wav file through wav file sink, > > > > > > then, > > > > > > that wav file's scope is blank, I get blank wva file, when > > > > > > am > > > > > > I > > > > > > doing wrong. I think, at transmitter side, amplitude of my > > > > > > original wav file source's amplitude is too low. > > > > > > PLease guide. > > > > > > > > > > > > > > > > > > With Best Regards, > > > > > > Maitry Raval, > > > > > > > > > > > > ----- Original Message ----- > > > > > > From: "Marcus Müller, CEL" <muel...@kit.edu> > > > > > > To: "maitry raval" <maitry.ra...@azistaaerospace.com> > > > > > > Cc: "discuss-gnuradio" <discuss-gnuradio@gnu.org> > > > > > > Sent: Friday, 17 May, 2019 11:57:45 > > > > > > Subject: Re: [Discuss-gnuradio] query regarding store > > > > > > transmitted signal > > > > > > > > > > > > https://wiki.gnuradio.org/index.php/FAQ#What_is_the_file_format_of_a_file_sink.3F_How_can_I_read_files_produced_by_a_file_sink.3F > > > > > > On Fri, 2019-05-17 at 17:06 +0530, Maitry Raval wrote: > > > > > > > Hello, > > > > > > > > > > > > > > Thanks for your reply. > > > > > > > > > > > > > > I.e It is possible to store the transmitted modulated > > > > > > > signal > > > > > > > (for ex AM modulated signal) through USRP as per below, > > > > > > > USRP source - file sink. but in which format, this data > > > > > > > can > > > > > > > be stored? (.txt, .pdf)_ I have seen.DAT file in one of > > > > > > > the > > > > > > > example,but when I tried , it does not give proper > > > > > > > output. > > > > > > > > > > > > > > Actually, my requirement is to receive the modulated > > > > > > > signal > > > > > > > through USRP source, store it in a file. and later, I can > > > > > > > be > > > > > > > able to do demodulation offline from that particular > > > > > > > stored > > > > > > > data. it will be grateful, if you provide guidance. > > > > > > > > > > > > > > > > > > > > > With Best Regards, > > > > > > > Maitry Raval, > > > > > > > > > > > > > > ----- Original Message ----- > > > > > > > From: "Marcus Müller, CEL" <muel...@kit.edu> > > > > > > > To: "discuss-gnuradio" <discuss-gnuradio@gnu.org>, > > > > > > > "maitry > > > > > > > raval" <maitry.ra...@azistaaerospace.com> > > > > > > > Sent: Friday, 17 May, 2019 10:50:00 > > > > > > > Subject: Re: [Discuss-gnuradio] query regarding store > > > > > > > transmitted signal > > > > > > > > > > > > > > Hi Maitry, > > > > > > > > > > > > > > sorry, we have no idea what lab you're referring to! > > > > > > > However, > > > > > > > yes, that > > > > > > > sounds exactly what File Sinks are meant to do. > > > > > > > > > > > > > > Best regards, > > > > > > > Marcus > > > > > > > > > > > > > > On Fri, 2019-05-17 at 12:01 +0530, Maitry Raval wrote: > > > > > > > > Hello, > > > > > > > > > > > > > > > > I want to store the modulated transmitted signal > > > > > > > > through > > > > > > > > USRP such as given in lab -3 receiving AM signal and > > > > > > > > store > > > > > > > > it as .DAT file. Is it possible to store transmitted > > > > > > > > signal > > > > > > > > as .DAT file through USRP source and file sink? and use > > > > > > > > that stored data from file source to do demodulation. > > > > > > > > thanks for your support in advance. > > > > > > > > > > > > > > > > > > > > > > > > With Best Regards, > > > > > > > > Maitry Raval, > > > > > > > > > > > > > > > > _______________________________________________ > > > > > > > > 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 > > > > > > _______________________________________________ > > > > > > 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
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