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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