GB1021927A - Pulse code signalling systems - Google Patents
Pulse code signalling systemsInfo
- Publication number
- GB1021927A GB1021927A GB2121764A GB2121764A GB1021927A GB 1021927 A GB1021927 A GB 1021927A GB 2121764 A GB2121764 A GB 2121764A GB 2121764 A GB2121764 A GB 2121764A GB 1021927 A GB1021927 A GB 1021927A
- Authority
- GB
- United Kingdom
- Prior art keywords
- gate
- output
- flip
- flop
- generator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
- H04M11/064—Data transmission during pauses in telephone conversation
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/47—Error detection, forward error correction or error protection, not provided for in groups H03M13/01 - H03M13/37
- H03M13/51—Constant weight codes; n-out-of-m codes; Berger codes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/17—Time-division multiplex systems in which the transmission channel allotted to a first user may be taken away and re-allotted to a second user if the first user becomes inactive, e.g. TASI
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/17—Time-division multiplex systems in which the transmission channel allotted to a first user may be taken away and re-allotted to a second user if the first user becomes inactive, e.g. TASI
- H04J3/172—Digital speech interpolation, i.e. DSI
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Probability & Statistics with Applications (AREA)
- Theoretical Computer Science (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
Abstract
1,021,927. Multiplex pulse code signalling. STANDARD TELEPHONES & CABLES Ltd. May 22, 1964 [May 29, 1963], No. 21217/64. Heading H4L. In a pulse communication system for transmitting a first type of intelligence, e.g. speech, in the form of digital code groups and a second type of intelligence, e.g. data represented by code characters, means are provided for detecting idle intervals in the first type of intelligence and for transmitting the second type of intelligence only during those idle intervals. Transmitter.-Speech from source 2 is pulse coded at 1, the output of the coder being supplied to an AND gate 4 and to a demodulator 5. The output of the demodulator 5 is amplified at 6, rectified at 7 and compared in a Schmitt trigger 8 with a reference voltage which is below the lowest quantizing level in coder 1. If the output of rectifier 7 is above the reference level the output of trigger 8 is high and the " 1 " output of flip-flop 9 is also high and AND gate 4 will pass the output from coder 1 via OR gate 10 to the transmitter 11. When the talker pauses, the output from rectifier 7 and trigger 8 falls and AND gate 4 is blocked, but due to the inverter 8a an output is provided by AND gate 12 to trigger a generator 13 to generate a predetermined code pattern which is sent via OR gate 10 to alert the receiving equipment to accept data signals. When the code pattern has been transmitted a reset pulse is supplied from generator 13 to flip-flop 9 to provide an output at " 0 " thereby blocking gate 12 and enabling AND gates 14, 15. The next clock pulse, via AND gate 14, triggers the data storage device 16 to supply a character via a shift register 17, AND gate 15 and OR gate 10 to the transmitter and data will continue to be sent during the lull in the conversation. When the talker resumes, rectifier 7 causes trigger 8 to supply a large output and inverter 8a causes AND gate 14 to be blocked to prevent more characters being transferred to the register 17. When register 17 is empty a voltage on output 18 is supplied to AND gate 19 together with the " 0 " output from the flip-flop 9 and the output from trigger 8, thus triggering a generator 20 to transmit a code pattern via OR gate 10 indicating to the receiver that P.C.M. speech signals are about to be received. When thiscode pattern has been transmitted, generator 20 supplies a pulse set flip-flop 9 so that gate 4 is open for the P.C.M. signals. Receiver.-Receiving equipment 22 supplies the incoming signals to a shift register 23 whose output stages are sampled by a matrix 24 arranged to detect the code pattern of generator 13 or 20. During speech reception both flipflops 25, 26 are set and provide a high " 1 " output so that the P.C.M. speech signal is supplied via AND gate 27 and OR gate 28 to the demodulator. When the code pattern of generator 13 is detected, an output from the matrix 24 via AND gate 30 changes over the flip-flop 25 so that AND gate 27 is blocked AND gates 32, 33 are enabled, and via delay line 34 and AND gate 35 the flip-flop 26 is changed over. This allows AND gate 32 to pass data signals to the output circuit and AND gate 33 to pass data timing pulses. Also the " 0 " outputs of flip-flops 25, 26 are supplied via OR gate 135 to enable AND gate 36 which passes to the P.C.M. demodulator a predetermined code sequence from coder 37 which represents the zero level of the speech code. When the code pattern of generator 20 is recognized, the flip-flop 25 is reset and via delay 40 flip-flop 26 is reset so that P.C.M. signals are passed through the gate 27, the gate 36 being blocked. When the data signals cease the clock pulses are also blocked by gate 33 so that the storage device is not activated and space is not taken up by gaps n the data transmission.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US284163A US3303285A (en) | 1963-05-29 | 1963-05-29 | Communication system for the selective transmission of speech and data |
US285011A US3310631A (en) | 1963-06-03 | 1963-06-03 | Communication system for the selective transmission of speech and data |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1021927A true GB1021927A (en) | 1966-03-09 |
Family
ID=26962448
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2121764A Expired GB1021927A (en) | 1963-05-29 | 1964-05-22 | Pulse code signalling systems |
GB2230164A Expired GB1043447A (en) | 1963-05-29 | 1964-05-29 | Pulse code signalling system |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2230164A Expired GB1043447A (en) | 1963-05-29 | 1964-05-29 | Pulse code signalling system |
Country Status (5)
Country | Link |
---|---|
BE (2) | BE648569A (en) |
BR (1) | BR6459332D0 (en) |
CH (1) | CH429821A (en) |
GB (2) | GB1021927A (en) |
NL (2) | NL6405705A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0003009A2 (en) * | 1977-12-22 | 1979-07-11 | Telefonaktiebolaget L M Ericsson | A method and an apparatus for transferring digital information in a telephone system |
EP0021145A1 (en) * | 1979-06-29 | 1981-01-07 | International Business Machines Corporation | Message multiplexing arrangement in a digital data communication system |
EP0082333A1 (en) * | 1981-12-17 | 1983-06-29 | International Business Machines Corporation | Interleaved digital data and voice communications system and method |
WO1985002959A1 (en) * | 1983-12-27 | 1985-07-04 | American Telephone & Telegraph Company | A digital communications system |
GB2162022A (en) * | 1984-07-17 | 1986-01-22 | Stc Plc | Data transmission system |
GB2162721A (en) * | 1984-08-01 | 1986-02-05 | Stc Plc | Transmission system |
EP0245868A2 (en) * | 1986-05-16 | 1987-11-19 | Nec Corporation | Signal communication capable of avoiding an audible reproduction of a sequency of information signals |
EP1018811A2 (en) * | 1999-01-04 | 2000-07-12 | Nec Corporation | Transmission control without limitation by the number of users |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2674999B1 (en) * | 1991-04-03 | 1994-10-07 | Thomson Csf | COMMUNICATION SYSTEM APPLICABLE IN PARTICULAR TO AIR TRAFFIC CONTROL. |
JP3418463B2 (en) * | 1994-10-27 | 2003-06-23 | 富士通株式会社 | Digital mobile telephone communication method and communication channel switching method, and mobile station and base station for realizing them |
FR2737487B1 (en) * | 1995-08-03 | 1998-01-09 | Saint Gobain Vitrage | DEVICE FOR MELTING VITRIFIABLE MATERIALS |
CN112289257B (en) * | 2020-10-29 | 2021-08-06 | 中国航发南方工业有限公司 | Display and operation device of gas turbine generator set |
CN112233613B (en) * | 2020-10-29 | 2021-08-06 | 中国航发南方工业有限公司 | Display panel assembly, display and operation device of gas turbine generator set |
-
1964
- 1964-05-20 BR BR15933264A patent/BR6459332D0/en unknown
- 1964-05-22 GB GB2121764A patent/GB1021927A/en not_active Expired
- 1964-05-22 NL NL6405705A patent/NL6405705A/xx unknown
- 1964-05-27 CH CH691964A patent/CH429821A/en unknown
- 1964-05-29 GB GB2230164A patent/GB1043447A/en not_active Expired
- 1964-05-29 BE BE648569D patent/BE648569A/xx unknown
- 1964-06-02 NL NL6406174A patent/NL6406174A/xx unknown
- 1964-06-03 BE BE648751D patent/BE648751A/xx unknown
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0003009A2 (en) * | 1977-12-22 | 1979-07-11 | Telefonaktiebolaget L M Ericsson | A method and an apparatus for transferring digital information in a telephone system |
EP0003009A3 (en) * | 1977-12-22 | 1979-07-25 | Telefonaktiebolaget L M Ericsson | A method and an apparatus for transferring digital information in a telephone system |
EP0021145A1 (en) * | 1979-06-29 | 1981-01-07 | International Business Machines Corporation | Message multiplexing arrangement in a digital data communication system |
EP0082333A1 (en) * | 1981-12-17 | 1983-06-29 | International Business Machines Corporation | Interleaved digital data and voice communications system and method |
US4528659A (en) * | 1981-12-17 | 1985-07-09 | International Business Machines Corporation | Interleaved digital data and voice communications system apparatus and method |
WO1985002959A1 (en) * | 1983-12-27 | 1985-07-04 | American Telephone & Telegraph Company | A digital communications system |
GB2162022A (en) * | 1984-07-17 | 1986-01-22 | Stc Plc | Data transmission system |
GB2162721A (en) * | 1984-08-01 | 1986-02-05 | Stc Plc | Transmission system |
US4663755A (en) * | 1984-08-01 | 1987-05-05 | Stc Plc | Transmission system |
EP0245868A2 (en) * | 1986-05-16 | 1987-11-19 | Nec Corporation | Signal communication capable of avoiding an audible reproduction of a sequency of information signals |
EP0245868A3 (en) * | 1986-05-16 | 1989-06-21 | Nec Corporation | Signal communication capable of avoiding an audible reproduction of a sequency of information signals |
EP1018811A2 (en) * | 1999-01-04 | 2000-07-12 | Nec Corporation | Transmission control without limitation by the number of users |
EP1018811B1 (en) * | 1999-01-04 | 2007-09-05 | Nec Corporation | Transmission control without limitation by the number of users |
Also Published As
Publication number | Publication date |
---|---|
BR6459332D0 (en) | 1973-10-23 |
BE648569A (en) | 1964-11-30 |
GB1043447A (en) | 1966-09-21 |
NL6405705A (en) | 1964-11-30 |
NL6406174A (en) | 1964-12-04 |
CH429821A (en) | 1967-02-15 |
BE648751A (en) | 1964-12-03 |
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