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EP0249205A2
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EP
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Automatic data/voice sending/receiving mode switching device
Assignee: Hitachi Ltd
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Filing: 1987-06-10
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Granted: —
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Expires: 2007-06-10
Abstract
Abstract A terminal device (1) sends/receives data and voice signals through a low speed circuit (7) to/from another device (2), while switching automatically data and voice signals. The terminal device (1) comprises a data sender/receiver (3), a voice sender/receiver (9), a modulator/demodulator (4), and an automatic mode switch (8). The automatic mode switch (8) includes a circuit (811) disposed between the data sender/receiver (3) and the modulator/demodulator (4) for detecting special data such as flags from received data coming from the modulator/demodulator (4), a circuit (812) for making a logical product of the output of this detecting circuit (811) and a detection signal of the received carrier and means for separating the voice sender/receiver from the circuit and transmitting a sending request for data sending/receiving use. Further switching over from the voice sending/receiving mode to the data sending/receiving mode is effected by key operations, etc.
Inventors
- 👤 Yoji Shibata
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 08:52
CPC Classifications
H; H04; H04M; H04M11/00; H04M11/06; Y; Y10; Y10S; Y10S379/00; Y10S379/902
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
154 words
A terminal device (1) which sends/receives data and voice signals through a low speed circuit 7 to/from another device (2), comprising: data sending/receiving means (3) which sends/ receives digital data; modulation/demodulation means (4) which modulates/demodulates digital data from/to said data sending/receiving means (3) in order to make them conform to said low speed circuit (7); voice sending/receiving means (9) which sends/receives voice signals through said low speed circuit (7); and voice/data switching means (8) disposed between said data sending/receiving means (3) and said modulation/demodulation means (4), said voice/data switching means (8) including detecting means (811) for detecting special data coming from said another device (2) through said modulation/demodulation means (4), means (812) for making a logical product of the output of said detecting means (811) and received carrier, and means (813, 819, 821, 824, 826, 828) for setting the data sending/receiving mode, receiving an output of said means (812) for making a logical product.
Claim 2
Dependent Claim
154 words
A terminal device (1) which sends/receives data and voice signals through a low speed circuit 7 to/from another device (2), comprising: data sending/receiving means (3) which sends/ receives digital data; modulation/demodulation means (4) which modulates/demodulates digital data from/to said data sending/receiving means (3) in order to make them conform to said low speed circuit (7); voice sending/receiving means (9) which sends/receives voice signals through said low speed circuit (7); and voice/data switching means (8) disposed between said data sending/receiving means (3) and said modulation/demodulation means (4), said voice/data switching means (8) including detecting means (811) for detecting special data coming from said another device (2) through said modulation/demodulation means (4), means (812) for making a logical product of the output of said detecting means (811) and received carrier, and means (813, 819, 821, 824, 826, 828) for setting the data sending/receiving mode, receiving an output of said means (812) for making a logical product.
Claim 3
Dependent Claim
23 words
A terminal device according to Claim 1, wherein said detecting means (811) in said voice/data switching means (8) is a flag detecting means.
Claim 4
Dependent Claim
56 words
A terminal device according to Claim 1, wherein said means (813, 819, 821, 824, 826, 828) for setting the data sending/receiving mode in said voice/data switching means (8) includes means for transmitting a sending request (RS) to said modulation/demodulation means (4) and means for separating said voice sending/receiving means (9) from said low speed circuit (7).
Claim 5
Dependent Claim
42 words
A terminal device according to Claim 1, wherein said voice/data switching means (8) includes means (813, 819, 821, 824, 826, 828) for recognizing that a voice sending from said voice sending/receiving means (9) is terminated and for setting the data sending/receiving mode.
Claim 6
Dependent Claim
56 words
A terminal device according to Claim 1, wherein said voice/data switching means (8) includes means (813, 819, 821, 824, 826, 828) for recognizing a data sending and for setting the data sending/receiving mode, when a voice reception from said another terminal device (2) is interrupted and data are sent from said data sending/ receiving means (3).
Claim 7
Dependent Claim
55 words
A terminal device according to Claim 1, wherein said voice/data switching means (8) includes means for detecting an interruption of the carrier from said another terminal device (2) and means (813, 819, 821, 824, 826, 828) for setting the data sending/receiving mode, receiving an output of said means for detecting an interruption of the carrier.
Claim 8
Dependent Claim
40 words
A terminal device according to Claim 1, wherein said voice/data switching means (8) includes means (819, 820, 828, 829, 912, 922, 924) for recognizing a voice sending from said voice sending/receiving means (9) and for setting the voice sending/receiving mode.
Claim 9
Dependent Claim
38 words
A terminal device according to Claim 1, wherein said voice/data switching means (8) includes means for interrupting said sending request (RS) to said modulation/demodulation means (4), while it is in said voice receiving mode or voice sending/receiving mode.
Claim 10
Dependent Claim
40 words
A terminal device according to Claim 3, further comprising means for delaying received voice by a period of time from the time when the carrier has been received to the time when the mode is switched to the data sending/receiving.
Claim 11
Dependent Claim
30 words
A terminal device according to Claim 5, wherein said voice/data switching means (8) includes (830) for delaying data to be sent, until it becomes possible for said another terminal device
Claim 12
Dependent Claim
26 words
(2) to pull-in the carrier sufficiently and to receive data, when said voice reception is interrupted and data are sent from said data sending/receiving means (3).
Claim 13
Dependent Claim
26 words
(2) to pull-in the carrier sufficiently and to receive data, when said voice reception is interrupted and data are sent from said data sending/receiving means (3).
Claim 14
Dependent Claim
200 words
A terminal device according to Claim 1, wherein said voice/data switching means (8) includes: a first flipflop (819) for setting the voice sending mode; a second flipflop (828) for setting the voice receiving mode; a third flipflop (821) for setting the data sending/receiving mode; means for putting said first and said second flipflop (819, 828) in a set state and at the same time said third flipflop (821) in a reset state on the basis of a voice sending request from said terminal device (1) itself; means for putting said first and said second flipflop (819, 828) in the set state and at the same time said third flipflop (821) in that reset state on the basis of the detection of the carrier interruption from said another terminal device (2); and means for putting said first and said second flipflop (819, 828) in the reset state and at the same time said third flipflop (821) in the set state on the basis of a voice sending termination signal from said terminal device (1) itself or a logical product signal of the output of the detecting means for detecting data sent by said another terminal device (2) and the received carrier.
Claim 15
Dependent Claim
75 words
A terminal device according to Claim 11, wherein said voice/data switching means (8) includes: first delaying means (818) for delaying the set input of said first flipflop (819) by a first period of time; second delaying means (827) for delaying the set input of said second flipflop (828) by a second period of time; and third delaying means (826) for delaying the set input of said third flipflop (821) by a third period of time.
Claim 16
Dependent Claim
54 words
A terminal device according to Claim 1, wherein said voice/data switching means (8) uses a sending data line (SD), a received data line (RD), a received carrier detection line (CD) and a data sending request line (RS) among interface connection lines . disposed between said data sending/receiving means (3) and said modulation/demodulation means (4).
Claim 17
Dependent Claim
97 words
An automatic switching device disposed between a data sender/receiver (3) and said modulator/demodulator (4) and switching automatically data and voice sending/receiving modes, comprising: means (811) for detecting special data from received data from said modulator/demodulator (4); means (812) for making a logical product of a received carrier detection signal from said modulator/demodulator (4) and an output signal of said means for detecting special data; and means (813, 819, 821, 824, 826, 828) for resetting the voice sending/receiving mode and for setting data sending/receiving mode, receiving an output signal of said means (812) for making a logical product.
Claim 18
Dependent Claim
97 words
An automatic switching device disposed between a data sender/receiver (3) and said modulator/demodulator (4) and switching automatically data and voice sending/receiving modes, comprising: means (811) for detecting special data from received data from said modulator/demodulator (4); means (812) for making a logical product of a received carrier detection signal from said modulator/demodulator (4) and an output signal of said means for detecting special data; and means (813, 819, 821, 824, 826, 828) for resetting the voice sending/receiving mode and for setting data sending/receiving mode, receiving an output signal of said means (812) for making a logical product.
Claim 19
Dependent Claim
59 words
An automatic switching device according to Claim 14, further comprising: means (832) for recognizing an interruption of the received carrier detection signal from said modulator/demodulator (4); and means (819, 820, 828, 829, 912, 922, 924) for resetting the data sending/receiving mode and setting the voice receiving mode, receiving an output signal of said means (832) for recognizing an interruption.
Claim 20
Dependent Claim
66 words
An automatic switching device according to Claim 14, further comprising: means (819, 820, 828, 829, 912, 922, 924) for recognizing the starting signal of a voice sending, setting the voice sending/receiving mode and resetting the data sending/receiving mode; and means (813, 819, 821, 824, 826, 828) for recognizing the termination signal of a voice sending, resetting the voice sending/recording mode and setting the data sending/receiving mode.
Claim 21
Dependent Claim
45 words
An automatic switching device according to Claim 14, wherein said means (811) for detecting special data has a circuit for detecting a predetermined flag from a received data line (RD) defined as a mutual connection circuit between said modulator/demodulator (4) and said data sender/receiver (3);
Claim 22
Dependent Claim
115 words
said means (812) for making a logical product has an AND gate circuit, for which the received carrier detection signal taken out from the received carrier detection line defined as the mutual connection circuit between said modulator/demodulator (4) and said data sender/receiver (3) and the output signal of said flag detection circuit (811) form one input, respectively; said means (813, 819, 821, 824, 826, 828) for setting the data sending/receiving mode has a flipflop circuit, which uses the output signal of said AND gate circuit as a set input and sends its output signal to the sending request line (RS) defined as the mutual connection circuit between said modulator/demodulator (4) and said data sender/receiver (3).
Claim 23
Dependent Claim
115 words
said means (812) for making a logical product has an AND gate circuit, for which the received carrier detection signal taken out from the received carrier detection line defined as the mutual connection circuit between said modulator/demodulator (4) and said data sender/receiver (3) and the output signal of said flag detection circuit (811) form one input, respectively; said means (813, 819, 821, 824, 826, 828) for setting the data sending/receiving mode has a flipflop circuit, which uses the output signal of said AND gate circuit as a set input and sends its output signal to the sending request line (RS) defined as the mutual connection circuit between said modulator/demodulator (4) and said data sender/receiver (3).
References Cited (Backward Citations)
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