FILTERING
This is the first assignment where we will attempt to integrate what you have learned.

In this directory, you will find two programs:

c31filt.c	DSK C3X program
freader.cpp	A Driver program

and some audio data:

SUN AU FORMAT	SUN SPARC FORMAT (16-BIT INTS)
AD-44.p10.au	AD-44.p10.raw
AD-44.p11.au	AD-44.p11.raw
AD-44.p11.au	AD-44.p11.raw
AD-44.p12.au	AD-44.p12.raw
AD-44.p13.au	AD-44.p13.raw
AD-44.p14.au	AD-44.p14.raw
AD-44.p15.au	AD-44.p15.raw
AD-44.p16.au	AD-44.p16.raw
AD-44.p17.au	AD-44.p17.raw
AD-44.p18.au	AD-44.p18.raw
AD-44.p19.au	AD-44.p19.raw

c31filt.c contains a function, called filter(), that processes data sample by sample. freader reads 16-bit sampled data from a file, processes it through the DSK board, and writes it back to a file:

freader.exe signal_swapped.raw signal_out.raw

Your task is the following:

• In MATLAB, implement the filter:
  
  Do the following:
  
  
  • plot the frequency response of the filter
    
    
  • plot the frequency response of audio data in signal.raw using a 512 point fft and a window centered at t = 1.0 secs.
    
    
  • filter the entire file through the filter, and plot the frequency response of the filtered signal at t = 1.0 secs
    
    
  • play the audio data through your sound system using your sound tools
  
  
• Implement this filter on the DSK using the c31filt.c program. Process the signal through this filter and demonstrate you get the same result (one way to do this is to difference the two signals sample by sample).
  
  Be sure to make sure the files match exactly at the beginning and ends of the file!
  
  Use your sound tools to compare the audio data by listening to the signals.
• Analyze the assembly code for your filter program and optimize it by recoding the filter by hand. Reprocess the signal and show that it gives the same result as before. Measure the improvement in speed in terms of C3X clock cycles.

This assignment will count for one MATLAB assignment and one DSP lab assignment. You will demonstrate your system to the Lab TA and answer questions about it (particularly the optimization). You will also turn in a web-based document describing this exercise in detail.

Please consult with your Lab TA - you will have many questions regarding the details of this lab.

Good luck.