References

• Doug Smith(KF6DX), Signals, Samples and Stuff: A DSP Tutorial, March-September 1998, QEX, ARRL.
  The author is the designer of Kachina 505DSP and is the current editor of QEX. These articles have been very good guide to my DSP experiment.
• Digital Signal Processiong, Chapter 18 of ARRL Handbook 47th ed. 1997.
• Wiseman,John(KE3QG),A Complete DSP Design Example Using FIR Filters, Jul. 1996 QEX, ARRL.
• HF Radio Systems & Circuits, William E. Sabin and Edgar O. Schoenike, Editors., 1998, Noble Publishing Corporation.
• JMac's DSP Notes
  Explanation of Hilbert Transformer and sample code.
• Digital Audio Page by Don Cross
  many sample codes. I learend the sine wave generation method from this site.