Re: [Discuss-gnuradio] query regarding wav file recording through wav file sink block

[CEL]

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" <address@hidden>
> To: "maitry raval" <address@hidden>
> Cc: "discuss-gnuradio" <address@hidden>
> 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" <address@hidden>
> > To: "maitry raval" <address@hidden>
> > Cc: "discuss-gnuradio" <address@hidden>
> > 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" <address@hidden>
> > > To: "maitry raval" <address@hidden>
> > > Cc: "discuss-gnuradio" <address@hidden>
> > > 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" <address@hidden>
> > > > To: "Marcus Müller, CEL" <address@hidden>
> > > > Cc: "discuss-gnuradio" <address@hidden>
> > > > 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" <address@hidden>
> > > > To: "Marcus Müller, CEL" <address@hidden>
> > > > Cc: "discuss-gnuradio" <address@hidden>
> > > > 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" <address@hidden>
> > > > To: "Marcus Müller, CEL" <address@hidden>
> > > > Cc: "discuss-gnuradio" <address@hidden>
> > > > 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" <address@hidden>
> > > > To: "maitry raval" <address@hidden>
> > > > Cc: "discuss-gnuradio" <address@hidden>
> > > > 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" <address@hidden>
> > > > > To: "discuss-gnuradio" <address@hidden>, "maitry
> > > > > raval" <address@hidden>
> > > > > 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,
> > > > > > 
> > > > > > _______________________________________________
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> > > > > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> > > > 
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