Demo program

For the following exercises, modify the demo program echo_via_circular_buffer.py

1. For the filter implemented in the demo program, what is the difference equation, transfer func- SUBMIT
   tion, and impulse response? Use Matlab to plot the pole-zero diagram of the filter.
2. Experiment with different delay and gain parameters. How do short delays (e.g., less than 50
   milliseconds) and long delays (e.g., longer than 0.2 seconds) sound different?
3. Modify the demo program so it produces a stereo output, with a different delay in right and left
   channels.
4. Note that the provided demo program truncates the output audio before it is finished (the end
   of the delayed signal is truncated). It is not noticeable for short delays or for wav files ending
   with a sufficiently long period of silence, but in other cases it may be noticeable. Modify the
   demo program so the output signal is not truncated at the end (i.e., so that the trailing end of
   the final echo is played.)
5. Modify the demo program so the input audio is from the microphone. SUBMIT
6. Modify the demo program so the input audio is from the microphone, and the output signal is
   saved to a wave file. Create a wave file of applying the filter to yourself saying your name; and
   submit your wave file as part of your work.
7. In the demo program echo_via_circular_buff

Sample Solution