Programmable multiple type data set
First Claim
1. A data modem comprising:
- signal processing means responsive to selected ones of a plurality of sets of instructions and to signals applied to said signal processing means for executing corresponding ones of a plurality of signal converting algorithms appropriate for alternative ones of data modem types to process said applied signals, digital processing means responsive to an external signal source designating individual ones of the data modem types for executing various ones of a plurality of communication line control algorithms, andmeans responsive to the execution of the communication line control algorithms for selecting the instruction sets corresponding to the signal converting algorithms appropriate for the designated data modem types.
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Accused Products
Abstract
A digital processor based voiceband modem that provides computers and terminals access to telephone lines and performs line control functions to originate, answer and terminate data calls in addition to converting baseband signals to voiceband and voiceband signals to baseband. The modem utilizes a signal processor that executes various signal converting algorithms under control of selected sets of instructions and further utilizes a digital processor that executes line control algorithms for alternative modes (i.e., originate or answer) of the data modem. An outgoing or incoming call enables the appropriate mode and, during the execution of the corresponding line control algorithm, various sets of instructions are selected to execute signal converting algorithms appropriate for the enabled mode of a specific one of various data modem types.
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Citations
9 Claims
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1. A data modem comprising:
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signal processing means responsive to selected ones of a plurality of sets of instructions and to signals applied to said signal processing means for executing corresponding ones of a plurality of signal converting algorithms appropriate for alternative ones of data modem types to process said applied signals, digital processing means responsive to an external signal source designating individual ones of the data modem types for executing various ones of a plurality of communication line control algorithms, and means responsive to the execution of the communication line control algorithms for selecting the instruction sets corresponding to the signal converting algorithms appropriate for the designated data modem types.
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2. A data modem for converting baseband signals to signals in a frequency spectrum suitable for conveyance by an analog communication line, for converting line frequency signals conveyed by the communication line to baseband signals and for exchanging line control information with the communication line, comprising:
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signal processing means responsive to said baseband and line frequency signals and to selected ones of a plurality of sets of instructions for executing corresponding ones of a plurality of signal converting algorithms appropriate for alternative modes of operation of various types of data modems to process said baseband and line frequency signals, digital processing means responsive to an external signal source for executing a particular one of a plurality of line control algorithms appropriate for a designated one of the modems, and means responsive to the execution of the line control algorithm for selecting instruction sets corresponding to signal converting algorithms appropriate for the designated mode of a specific one of the data modem types. - View Dependent Claims (3, 4, 5, 6)
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7. A data modem for converting baseband signals to signals in a frequency spectrum suitable for conveyance by an analog communication line and for converting line frequency signals conveyed by the communication line to baseband signals, comprising:
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signal processing means responsive to said baseband and line frequency signals and to selected ones of a plurality of sets of instructions for executing corresponding ones of a plurality of signal converting algorithms appropriate for alternative modes of operation of various types of data modems to process said baseband and line frequency signals, and digital processing means responsive to incoming calling signals on the communication line for executing a line control algorithm appropriate for a designated one of the modes and for selecting instruction sets corresponding to signal converting algorithms appropriate for the designated mode of a specific one of the data modem types, the digital processing means further including means responsive to baseband signals converted from line frequency signals by the signal processing means for selecting further instruction sets appropriate for the designated mode of a different one of the data modem types.
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8. A method for converting baseband signals to signals in a frequency spectrum suitable for conveyance by an analog communication line, for converting line frequency signals conveyed by the communication line to baseband signals and for exchanging line control information with the communication line, comprising the steps of:
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specifying individual ones of a plurality of data modem types, executing particular ones of a plurality of communication line control algorithms appropriate for a designated one of alternative modes of operation of data modems in response to an external signal source, selecting sets of instructions defining signal converting algorithms appropriate for the designated mode of the specified individual data modem type, and executing the signal converting algorithms in accordance with the instructions in the selected sets to perform said converting. - View Dependent Claims (9)
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Specification