Baseband signal processing unit and method of operating the same
First Claim
1. A baseband processing unit comprising:
- processor means for;
(a) periodically acquiring and processing a first (forward) voice signal, (b) periodically producing successive digitized samples of a first supervisory audio tone (SAT) during the interval between successive acquisitions of the forward voice signal;
(c) periodically acquiring and processing a second (reverse) voice signal, and (d) detecting the presence of a second SAT by sampling successive digitized samples thereof and establishing their power during the interval between successive acquisitions of the forward voice signal; and
communication means for communicating the forward and reverse voice signals to and from the processor and for carrying the first SAT signal from the processor and for carrying the second SAT to the processor.
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Accused Products
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.
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Citations
13 Claims
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1. A baseband processing unit comprising:
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processor means for;
(a) periodically acquiring and processing a first (forward) voice signal, (b) periodically producing successive digitized samples of a first supervisory audio tone (SAT) during the interval between successive acquisitions of the forward voice signal;
(c) periodically acquiring and processing a second (reverse) voice signal, and (d) detecting the presence of a second SAT by sampling successive digitized samples thereof and establishing their power during the interval between successive acquisitions of the forward voice signal; andcommunication means for communicating the forward and reverse voice signals to and from the processor and for carrying the first SAT signal from the processor and for carrying the second SAT to the processor. - View Dependent Claims (2, 3, 4)
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5. For use in a land-based cellular telephone cell site having a transmitter for transmitting both forward voice signals and a first supervisory audio tone (SAT) to a mobile unit, and a receiver for receiving both reverse voice signals and a second SAT from the mobile unit, a baseband unit for processing the forward and reverse voice signals and for generating the first SAT and for detecting the second SAT, comprising:
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digital signal processor means for;
(a) periodically acquiring and processing a first (forward) voice signal, (b) periodically producing successive digitized samples of a first SAT during the interval between successive acquistion of forward voice signals, (c) periodically acquiring and processing a second (reverse) voice signal from the receiver, and (d) detecting the presence of a second SAT received by the receiver by sampling successive digitized samples thereof and establishing the power thereof during the interval between successive acquisition of the forward voice signals;coder/decoder means for coding and decoding forward and reverse voice signals and SAT'"'"'s communicated between the processor means and the transmitter and the receiver; and a bandpass filter for filtering the signals coded and decoded by the coder/decoder means. - View Dependent Claims (6)
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7. A method of processing signals comprising the steps of:
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periodically acquiring a first (forward) voice signal and processing it to perform at least one prescribed operation thereon; periodically generating successive digitized samples of a first supervisory audio tone (SAT) such that at least two successive samples are generated within the interval between successive acquisitions of the forward voice signal; detecting a second SAT during each interval between successive acquisitions of the forward voice signal by sampling at least two successive second SAT samples and calculating the power thereof; and periodically acquiring and processing a second (reverse) voice signal such that at least one reverse voice signal is acquired and processed within the interval signal following receipt of a control signal. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification