H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/30
H04B 7/26 (2006.01) H04B 17/00 (2006.01) H04Q 7/30 (2006.01)
Patent
CA 2032849
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.
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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