B.Maple7 programming guide by Monagan M.

By Monagan M.

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To read two characters followed by one 32-bit integer, we could use: ID = fread(FileId, 2, ‘uchar’); FileSize = fread(FileId, 1, ‘ulong’); If the signal data file is stored in 8- or 16-bit binary format, then it may be necessary to use the above functions to read in the raw data. In that case, it is usually necessary to convert to floating point format using the double conversion function. In the following, note how the number is truncated when converted to uint8 format (unsigned 8-bit integer), and precision is lost when converted to uint16 format (unsigned 16-bit integer).

Thus the matrix M has been taken down the first column, then down the second. To get a data file of the same “shape,” it is necessary to add two format fields, and transpose the matrix so that MT is now a 2 × 4 matrix. 63 In addition to text files as discussed above, one may encounter binary data files. These are not viewable using text editors—they consist of “raw” 8 or 16-bit quantities (usually), which are machine readable and not human readable. indd 33 4/13/2011 5:20:51 PM 34 CHAPTER 2 MATLAB FOR SIGNAL PROCESSING are different conventions in common use depending on the manufacturer.

B) Determine the size of the sample vector. Does this correspond to the sample rate you selected when saving the file? (c) Plot the entire waveform (as above), and portions of it using vector subscripting. Note how the 16-bit audio samples are converted to floating-point values for calculation. 6. A certain DSP problem requires a buffer of 32,768 samples. 7. What does the any() command do? Which one of these loop constructs is probably what was intended? Why? 8. We will later use the “sinc” function, defined as sin (πt/T)/(πt/T), where t is a vector of time instants and T is a constant.

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