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

[Maitry Raval]

Yes, the amplitude of a wav file saved with a wav file sink is differnt while I 
open it with wav file source

----- Original Message -----
From: "Marcus Müller, CEL" <address@hidden>
To: "maitry raval" <address@hidden>
Cc: "discuss-gnuradio" <address@hidden>
Sent: Friday, 7 June, 2019 08:15:30
Subject: Re: query regarding wav file recording through wav file sink block

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