How to filter sepcific frequencies from Audio file or Microphone in iOS












0















The app I am working on now is simple, it collects data from an ECG equipment via microphone and send to server for analysis. it works fine, but the problem is, the file size is more than 8M with only 30 seconds collecting, in WAV format. It will cost a lot of bandwidth(which means a lot of money for customer here) to send the data to server.



The ECG equipment generate voice signals at frequency 18k - 20k, So what we want to do is to reduce the size of data file to save the bandwidth.



As to how to reduce the size of the data file, what we want is as following:





  1. open the WAV file

  2. Filter and pick the specific frequencies (18k-20k) data from the file

  3. Save the data generated in step 2 into a new file , which should be much less size.

  4. Send the new file which only contain the need ECG data to server for analysis.




For step 2 and 3, does anyone knows about any lib or open source project in iOS which would help?



Thanks a lot in advance.



Jennifer






ios audiokit







share|improve this question





























    0















    The app I am working on now is simple, it collects data from an ECG equipment via microphone and send to server for analysis. it works fine, but the problem is, the file size is more than 8M with only 30 seconds collecting, in WAV format. It will cost a lot of bandwidth(which means a lot of money for customer here) to send the data to server.



    The ECG equipment generate voice signals at frequency 18k - 20k, So what we want to do is to reduce the size of data file to save the bandwidth.



    As to how to reduce the size of the data file, what we want is as following:





    1. open the WAV file

    2. Filter and pick the specific frequencies (18k-20k) data from the file

    3. Save the data generated in step 2 into a new file , which should be much less size.

    4. Send the new file which only contain the need ECG data to server for analysis.




    For step 2 and 3, does anyone knows about any lib or open source project in iOS which would help?



    Thanks a lot in advance.



    Jennifer






    ios audiokit







    share|improve this question



























      0












      0








      0








      The app I am working on now is simple, it collects data from an ECG equipment via microphone and send to server for analysis. it works fine, but the problem is, the file size is more than 8M with only 30 seconds collecting, in WAV format. It will cost a lot of bandwidth(which means a lot of money for customer here) to send the data to server.



      The ECG equipment generate voice signals at frequency 18k - 20k, So what we want to do is to reduce the size of data file to save the bandwidth.



      As to how to reduce the size of the data file, what we want is as following:





      1. open the WAV file

      2. Filter and pick the specific frequencies (18k-20k) data from the file

      3. Save the data generated in step 2 into a new file , which should be much less size.

      4. Send the new file which only contain the need ECG data to server for analysis.




      For step 2 and 3, does anyone knows about any lib or open source project in iOS which would help?



      Thanks a lot in advance.



      Jennifer






      ios audiokit







      share|improve this question
















      The app I am working on now is simple, it collects data from an ECG equipment via microphone and send to server for analysis. it works fine, but the problem is, the file size is more than 8M with only 30 seconds collecting, in WAV format. It will cost a lot of bandwidth(which means a lot of money for customer here) to send the data to server.



      The ECG equipment generate voice signals at frequency 18k - 20k, So what we want to do is to reduce the size of data file to save the bandwidth.



      As to how to reduce the size of the data file, what we want is as following:





      1. open the WAV file

      2. Filter and pick the specific frequencies (18k-20k) data from the file

      3. Save the data generated in step 2 into a new file , which should be much less size.

      4. Send the new file which only contain the need ECG data to server for analysis.




      For step 2 and 3, does anyone knows about any lib or open source project in iOS which would help?



      Thanks a lot in advance.



      Jennifer






      ios audiokit




      ios audiokit






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Nov 22 '18 at 5:39









      Ketan Odedra

      13616




      13616










      asked Nov 22 '18 at 4:12









      JenniferJennifer

      12




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