What's Next

    Much emphasis has been placed in fine-tuning the filters and figuring out meaningful observations from the raw y[n] data.   If given more time and resources, we would really like to add the following to our project:
 
 

Filter Design

• Variable thresholding for each filter for more resolution.  To be able to extract all the frequencies within 200-1600Hz that are contained in square waves and triangle waves, the thresholding has to reflect the different  fourier series coefficients.

• Expand on the target frequency range beyond 200-1600Hz.  Use EEPROM and other sources of memory.

• Experiment with bigger filter lengths (>100 coefficients).  This will narrow the pass-band and make filters sharper, reduce filter overlap.

• Digital-to-Analog-Converter to convert y[n] output into analog waveforms.

Display

• A stand-alone display, such as LCD.  So that our spectrum analyzer can be a unit by itself.  The LCD will display yes/no answers to whether a signal contains a specific frequency.

• A program in high-level language to automatically generate spectrum plots, obtaining data from the RS232 serial port.