Baseband signal processing unit and method of operating the same

Details Baseband signal processing unit and method of operating the same Baseband signal processing unit and method of operating the same

1990-01-29

1991-03-19

Ng, Jin F.

Telephonic communications

Audio message storage, retrieval, or synthesis

370 29, 370 50, H04M 1100, H04B 156, H04J 400

Patent

active

050017420

ABSTRACT:
A baseband processing unit (10) for use in a cellular telephone cell site includes a digital signal processor (20) which serves to process forward voice signals intended for transmission to a mobile unit (12) as well as process the reverse voice signals received from the mobile unit. The digital signal processor further serves to produce a first supervisory audio tone (SAT) for transmission to the mobile unit by generating successive digital SAT samples which are decoded into a continuous tone. In addition, the digital signal processor serves to detect the presence of a second SAT generated by the mobile unit by sampling and processing successive samples of the second SAT and measuring the power thereof.

REFERENCES:
patent: 4513412 (1985-04-01), Cox
patent: 4670899 (1987-06-01), Brody et al.
patent: 4675863 (1987-06-01), Paneth et al.
IEEE Standard Dictionary of Electrical and Electronics Terms, 1984, p. 82.
Introduction to Digital Signal Processing by Proakis and Manolakis pp. 395-400 and 795-848.
IEEE Transactions on Acoustics, Speech and Signal Processing, 12/89 "Interprocessor Communications in Synchronous Multiprocessor Digital Signal Processing Chips" by Decaluwe et al.
G. A. Arredondo, J. C. Feggeler, and J. I. Smith, The Bell System Technical Journal, vol. 58, pp. 97-143 (1979).
N. Ehrlich, R. E. Fisher, and T. K. Wingard, The Bell System Technical Journal, vol. 58, pp. 153-199 (1979).

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