EP0142302A2
Expired / Lapsed
EP
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Programmable multiple type data modem
Assignee: AT&T Inc
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Filing: 1984-10-24
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Granted: —
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Expires: 2004-10-24
Abstract
Abstract @ A digital processor based voiceband modem (104) that provides computers and terminals access to telephone lines (102) 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 (104) utilizes a signal processor (124) that executes various signal converting algorithms under control of selected sets of instructions and further utilizes a digital processor (127) 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.
Inventors
- 👤 Salomi Theodoulous Charalambous
- 👤 Mark Philip Horvath
- 👤 Cathy Pietsch House
- 👤 Jeffrey Allen Iapicco
- 👤 Paul Dave Lue
- 👤 Shiv Prakash Verma
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 14:10
CPC Classifications
H; H04; H04M; H04M11/00; H04M11/06; H04L; H04L27/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
104 words
A data modem (104) for interfacing a baseband data communicating device (101) with an analog communication line (102) characterised by signal processing means (124) responsive to selected ones of a plurality of sets of instructions for executing corresponding ones of a plurality of signal converting algorithms appropriate for alternative ones of data modem types, and digital processing means (127) responsive to an.external signal source (120,133) designating individual ones of the data modem types for executing various ones of a plurality of communication line control algorithms and for selecting the instruction sets corresponding to the signal converting algorithms appropriate for the designated data modem types.
Claim 2
Dependent Claim
104 words
A data modem (104) for interfacing a baseband data communicating device (101) with an analog communication line (102) characterised by signal processing means (124) responsive to selected ones of a plurality of sets of instructions for executing corresponding ones of a plurality of signal converting algorithms appropriate for alternative ones of data modem types, and digital processing means (127) responsive to an.external signal source (120,133) designating individual ones of the data modem types for executing various ones of a plurality of communication line control algorithms and for selecting the instruction sets corresponding to the signal converting algorithms appropriate for the designated data modem types.
Claim 3
Dependent Claim
42 words
A data modem as claimed in claim 1 for interfacing a baseband data communicating device with a voiceband communication line, wherein the data processing means includes means for selecting the instruction sets in response to the execution of the line control algorithms.
Claim 4
Dependent Claim
53 words
A data modem as claimed in claim 2, wherein the digital processing means (127) further includes means for selecting initial ones of the instruction sets corresponding to incoming line signal converting algorithms appropriate for the designated data modem types and means responsive to the converted incoming voiceband signals for selecting further instruction sets.
Claim 5
Dependent Claim
206 words
A data modem as claimed in claim 1, 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, wherein the digital processing means (127) includes means responsive to a request by a digital device that a specific data modem type initiate a call to a remote data station for executing a sequence of operations that calls the remote data station by way of the communication line and that enables the digital device to exchange baseband data signals when the remote data station returns an answering signal, and the selecting means includes means responsive to the execution of the call operation for selecting an instruction set corresponding to a signal converting algorithm that converts the data station answering signal to baseband control signals and means responsive to the execution of the enable operation for selecting an instruction set corresponding to signal converting algorthims for converting baseband data signals to line frequency signals and for converting line frequency signals to baseband data signals in a manner appropriate for the designated mode of the specific data modem type.
Claim 6
Dependent Claim
60 words
A data modem as claimed in claim 4, wherein the execution of the call operation includes an operation that applies an off-hook condition to the communication line and the selecting means includes means responsive to the execution of the apply operation for selecting an instruction set corresponding to a signal converting algorithm that converts dial tone to baseband control signals.
Claim 7
Dependent Claim
74 words
A data modem as claimed in claim 6, wherein the execution of the call operation includes an operation that enables the digital device to send digital dialing signals when the signal processor provides the baseband control signals and the selecting means includes means responsive to the execution of the enable sending dialing signals operation for selecting an instrucion set corresponding to a signal converting algorithm that converts digital dialing signals to multifrequency dialing signals.
Claim 8
Dependent Claim
66 words
A data modem as claimed in claim 5, wherein the selecting means further includes means for selecting initial ones of the instruction sets corresponding to line frequency signal to baseband signal converting algorithms appropriate for a first specific one of the data modem types and means responsive to the baseband signal thus converted from line signals by the signal processing means for selecting further instruction sets.
Claim 9
Independent Claim
101 words
A method for converting baseband signals to signals in a frequency spectrum suitable for conveyance by an analog communication line, characterised by the steps of 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.
Claim 10
Independent Claim
101 words
A method for converting baseband signals to signals in a frequency spectrum suitable for conveyance by an analog communication line, characterised by the steps of 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.
Claim 11
Dependent Claim
52 words
A method as claimed in claim 8, wherein the step of selecting sets of instructions includes the step of selecting further instruction sets defining signal converting algorithms appropriate for another individual data modem type in response to baseband signals converted from line frequency signals by the execution of the signal converting algorithm.
References Cited (Backward Citations)
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