References

1

R. Schmidt, ``Multiple emitter location and signal parameter estimation,'' RADC Spectrum Estimation Workshop, pp. 243 - 258, 1979.

2

B. Widrow and S. D. Stearns, Adaptive Signal Proccessing. Prentice-Hall, Englewood Cliffs, NJ, 1985.

3

P. Mock, ``Add DTMF generation and decoding to DSP- designs,'' EDN, vol. 30, pp. 205-220, March 21 1985.

4

J. Y. Cheung, ``A direct adaptive frequency estimation technique,'' Midwest Symposium on Circuits and Systems, pp. 804 - 807, 1987.

5

F. A. Sakarya and G. Arslan, ``LMS ve MUSIC algoritmalari ile DTMF alici tasarimi,'' Proc. 3. Sinyal leme ve Uygulamalari Kurultayi, 1995.

6

J. Pino, S. Ha, E. Lee, and J. Buck, ``Software synthesis for DSP using Ptolemy,'' Journal on VLSI Signal Processing, vol. 9, pp. 7-21, Jan. 1995.

7

CCITT Blue Book, Recommendation Q.23: Technical Features of Push-Button Telephone Sets. Geneva, 1989.

8

CCITT Blue Book, Recommendation Q.24: Multi-Frequency Push-Button Signal Reception. Geneva, 1989.

9

A. V. Oppenheim and R. W. Schafer, Discrete-Time Signal Processing. Prentice-Hall, 1990.

10

Analog Devices, DSP Applications using the ADSP-2100 Family. Prentice-Hall, 1992.

11

P. Stoica and A. Nehorai, ``MUSIC, Max. Likelihood, and Cramer-Rao Bound,'' IEEE Trans. on Acoustics, Speech, and Sig. Proc., vol. 37, no. 5, pp. 720-741, 1989.

12

D. S. Watkins, Fundamentals of Matrix Computations. John Wiley & Sons, 1991.

13

E. A. Lee and D. G. Messerschmitt, ``Synchronous data flow,'' Proc. of the IEEE, Sept. 1987.

  
Figure 1: Effect of total number of samples on the efficiency ratio eff for .

  
Figure 2: Change of efficiency ratio eff relative to the number of samples with .

ACKNOWLEDGEMENT

We would like to thank Prof. Metin Yü cel from Yildiz Technical University (YTÜ ), Luis J. Gutierrez from University of California at Berkeley, and Onur Taç kin formerly from YTÜ, who indirectly contributed to this work.