Digital line card having universal port for upgrading electronic messaging system
First Claim
1. A digital line card providing a universal port for a messaging system to receive and store voice messages and data transmittals, the data transmittals comprising text or image or both, the digital line card enabling the messaging system to receive and record voice messages and data transmittals over a single port, the digital line card comprising:
- a. signal processor means for processing an incoming data stream from said single port according to a plurality of signal processing algorithms to generate a processed data stream, the plurality of algorithms including algorithms for discriminating between and processing voice signals, data signals including modulated frequency (MF) and command signals in the incoming data stream, wherein the plurality of algorithms provide for the detection of command signals concurrently with the processing of the voice and data signalsb. storage means for storing program code implementing the plurality of signal processing algorithms;
c. controller means for instructing the signal processor means to execute program code implementing a selected one of the plurality of algorithms, so that the controller means repeatedly switches the signal processor means between executing program code implementing a first one of the plurality of algorithms and executing program code implementing a second one of the plurality of algorithms responsive to the command signals.
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Accused Products
Abstract
A digital line card is provided for use in an electronic messaging system for enabling the receipt of voice and text or image data over a single communications port. The digital line card includes a digital signal processing integrated circuit, a microprocessor and a random access memory component for storing coding schemes employed by the digital signal processing integrated circuit. The digital line card is programmed to detect the presence of dual-tone multifrequency command signals in the incoming data stream, and to switch between voice and data processing responsive to the command signals.
51 Citations
20 Claims
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1. A digital line card providing a universal port for a messaging system to receive and store voice messages and data transmittals, the data transmittals comprising text or image or both, the digital line card enabling the messaging system to receive and record voice messages and data transmittals over a single port, the digital line card comprising:
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a. signal processor means for processing an incoming data stream from said single port according to a plurality of signal processing algorithms to generate a processed data stream, the plurality of algorithms including algorithms for discriminating between and processing voice signals, data signals including modulated frequency (MF) and command signals in the incoming data stream, wherein the plurality of algorithms provide for the detection of command signals concurrently with the processing of the voice and data signals b. storage means for storing program code implementing the plurality of signal processing algorithms; c. controller means for instructing the signal processor means to execute program code implementing a selected one of the plurality of algorithms, so that the controller means repeatedly switches the signal processor means between executing program code implementing a first one of the plurality of algorithms and executing program code implementing a second one of the plurality of algorithms responsive to the command signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A digital line card for a messaging system that receives and stores voice messages and data transmittals, the data transmittals comprising text or image or both, the digital line card enabling the messaging system to receive and record voice messages and data transmittals over a single communications port, the digital line card comprising:
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a. a digital signal processing integrated circuit for processing an incoming data stream from said single communications port, the digital signal processing integrated circuit using a first algorithm when the incoming data stream comprises speech, a second algorithm when the incoming data stream comprises text or image data, and a third algorithm for detecting the presence of command signals in the incoming data stream, wherein the third algorithm operates with either of the first and second algorithms; b. a random access memory integrated circuit for storing program code implementing the first, second and third algorithms; c. a microprocessor for instructing the digital signal processing integrated circuit to execute program code implementing the third algorithm to detect the presence of command signals in the incoming data stream and to execute program code implementing either the first algorithm or the second algorithm responsive to the command signals, so that the digital signal processing integrated circuit repeatedly switches between performing the first algorithm and performing the second algorithm responsive to the command signals. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification