I need to find out the compression ratio of an audio signal ?Is it correct method that I have done here?

byte_size_of_sampled_signal=4.826071911134670e-42 kb ;
byte_Size_of_compressed_data=4.663521289272991e-42kb;
byte_Size_of_decompressed_signal=2.326155450779196e-42kb;

Calculation of compression ratio:

Is this method is correct????????????

C.R=byte_Size_of_compressed_data/byte_size_of_sampled_signal=0.966318234610918;
                               OR

this method is correct???????????

C.R=byte_Size_of_decompressed_signal/byte_size_of_sampled_signal=0.481997677119628;

Answer 1

[Walter Roberson]

No. Any program that is telling you that you have 10^(-42) Kb of anything is broken.

You know that I posted the correction for your file size routine a while ago. You had

switch returnType
  case {'b','byte','bytes'}
      b = s.bytes;
%  case {'kb','kbs','kilobyte','kilobytes'}
      b = b / 1024;
  %case {'mb','mbs','megabyte','megabytes'}
      b = b / 1024^2;
  %case {'gb','gbs','gigabyte','gigabytes'}
      b = b / 1024^3;
  %case {'tb','tbs','terabyte','terabytes'}
      b = b / 1024^4;
  %case {'pb','pbs','petabyte','petabytes'}
      b = b / 1024^5;
  otherwise
      returnType = 'bytes';

and the problem with that is that when you comment out a "case" label you do not comment out the action that goes with it. You need

switch returnType
  case {'b','byte','bytes'}
      b = s.bytes;
  case {'kb','kbs','kilobyte','kilobytes'}
      b = b / 1024;
  case {'mb','mbs','megabyte','megabytes'}
      b = b / 1024^2;
  case {'gb','gbs','gigabyte','gigabytes'}
      b = b / 1024^3;
  case {'tb','tbs','terabyte','terabytes'}
      b = b / 1024^4;
  case {'pb','pbs','petabyte','petabytes'}
      b = b / 1024^5;
  otherwise
      returnType = 'bytes';

As for the formula for compression ratio, see http://uk.mathworks.com/matlabcentral/answers/237620-how-to-calculate-image-compression-ratio

Answer 2

[PRATIBHA WARKADE]

thank u very much sir i got the answer