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 _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
