how to save the data as .wav file taken from DAQ card

[zabi154]

Helloo every one,

i m working on a project in which i am using daq card . i was able to save the data in text fornmat and binary but i  dont how to save data taken  frm the daq card as .wav file. can some one help me out

   Regards zohaib

[Paul_F-MCP]

Hi Zohaib,

If you look under the programming tab for graphics and sound there are an number of blocks for handling .wav files. You can supply a waveform direct into one of these and it will create a .wav file for you.

Paul

[zabi154]

 hi paul

         Thanx paul for ur reply. i hve been  following the same procedure early  as well  but  when i play the saved  file or  play direct frm the out of daq  ,  i listen a beep like ouput but not the actual input which i hve given to the daq card.i want to ask another question  if a give .wav file as a input to daq card the output of the daq card is the same as .wav file or different.?

       zohaib

[Coq_Rouge]

Why a wav file? Do you plan to play your data om some media player afterwards? That can be done. But you have to select your sample rate with care. I suggest you tell us more about what you are doing. And perhaps post some code. But please post your code not some screen dumps

[Paul_F-MCP]

It does sound like your sample rate is set incorrectly - beeps or clicks from the sound card are common in this case. If you're reconstructing a waveform from your DAQ data to send to a .wav then you need to make sure the dT element is correct. The maximum is 44.1kHz if I remember correctly, although lower will work. You can resample acquired data to a different sample rate, but it's far better to capture it at the correct rate in the first place (and have appropriate analgue filtering on the input to the DAQ).

Paul

[zabi154]

actually i hve to design  a voice logging system using  DAQ card which can logg voice and if user want to play the logged data  they can play it. i hve to take voice input from 24 different channels simultaneously, write now i m working  with one channel then i will apply the same logic to other channels sa well, i think i dont need to construct a waveform..i dont hve a code that could be helpful to u i hve  just started this project ,

               zohaib

[GoCougs]

when the user plays the logged data, how are you planning on playing the audio stream? Are you going to play it on a software program, such as windows media player, or do you need to output the raw analog signal directly to a speaker system?

[zabi154]

there is a block in the labview to play the .wav file i hve planned to  play the file from that block 

       zohaib

[Coq_Rouge]

It has been a trend now that sound card only support  some samplerates rather than a range. But every sound card do support 44100 Hz as sample rate and in most cases also 22050 Hz. So you must adjust the sample rate. On the DAQ card. To a sample rate that is supported by your sound card

[zabi154]

now i was able to listen the audio signal through daq but it stops automatically given an error . i m taken continous data, it takes certain amount of samples and then stops i hve vary the samples to read which act as buffers size in continous still the problem not resolved how to overcome this problem

    zohaib