CA1124899A - Time division multiplexed transmission system for telephone or like signals with frequency band compression - Google Patents
Time division multiplexed transmission system for telephone or like signals with frequency band compressionInfo
- Publication number
- CA1124899A CA1124899A CA330,392A CA330392A CA1124899A CA 1124899 A CA1124899 A CA 1124899A CA 330392 A CA330392 A CA 330392A CA 1124899 A CA1124899 A CA 1124899A
- Authority
- CA
- Canada
- Prior art keywords
- codewords
- signals
- bit
- code
- time division
- 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
- 230000005540 biological transmission Effects 0.000 title claims abstract description 27
- 230000006835 compression Effects 0.000 title abstract description 8
- 238000007906 compression Methods 0.000 title abstract description 8
- 230000003044 adaptive effect Effects 0.000 claims abstract description 6
- 230000004044 response Effects 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 abstract description 36
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 239000000284 extract Substances 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000011664 signaling Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002592 echocardiography Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000009432 framing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000001702 transmitter Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
- H04J3/1682—Allocation of channels according to the instantaneous demands of the users, e.g. concentrated multiplexers, statistical multiplexers
- H04J3/1688—Allocation of channels according to the instantaneous demands of the users, e.g. concentrated multiplexers, statistical multiplexers the demands of the users being taken into account after redundancy removal, e.g. by predictive coding, by variable sampling
-
- 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
- H04J3/177—Freeze-out systems, e.g. taking away active sources from transmission
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Time-Division Multiplex Systems (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP76022/1978 | 1978-06-22 | ||
| JP7602278A JPS5523603A (en) | 1978-06-22 | 1978-06-22 | Method and apparatus for coding and decoding of telephone signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1124899A true CA1124899A (en) | 1982-06-01 |
Family
ID=13593192
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA330,392A Expired CA1124899A (en) | 1978-06-22 | 1979-06-22 | Time division multiplexed transmission system for telephone or like signals with frequency band compression |
Country Status (3)
Families Citing this family (36)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4389538A (en) * | 1981-01-12 | 1983-06-21 | Rockwell International Corporation | Multiplexer for single-octave data processor |
| IT1144551B (it) * | 1981-02-24 | 1986-10-29 | Cselt Centro Studi Lab Telecom | Dispositivo numerico per la discriminazione di segnali vocali e segnali dati entrambi numerizzati |
| US4455649A (en) * | 1982-01-15 | 1984-06-19 | International Business Machines Corporation | Method and apparatus for efficient statistical multiplexing of voice and data signals |
| US4825451A (en) * | 1982-10-11 | 1989-04-25 | Niravoice, Inc. | Technique for transmission of voice communications and apparatus useful therein |
| US4519073A (en) * | 1983-06-20 | 1985-05-21 | At&T Bell Laboratories | Bit compression multiplexer |
| US4549304A (en) * | 1983-11-28 | 1985-10-22 | Northern Telecom Limited | ADPCM Encoder/decoder with signalling bit insertion |
| US4675863A (en) * | 1985-03-20 | 1987-06-23 | International Mobile Machines Corp. | Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of RF channels |
| DE3513074A1 (de) * | 1985-04-12 | 1986-10-23 | Telefunken Fernseh Und Rundfunk Gmbh, 3000 Hannover | Verfahren zur digitalen nachrichtenuebertragung |
| JPH0648796B2 (ja) * | 1988-02-05 | 1994-06-22 | 日本電気株式会社 | デマンドアサイン方式衛星通信装置 |
| US4937844A (en) * | 1988-11-03 | 1990-06-26 | Racal Data Communications Inc. | Modem with data compression selected constellation |
| EP0418396B1 (en) * | 1989-03-16 | 1998-06-03 | Fujitsu Limited | Video/audio multiplex transmission system |
| JP3321802B2 (ja) * | 1990-06-28 | 2002-09-09 | キヤノン株式会社 | ディジタル信号処理装置 |
| US5068715A (en) * | 1990-06-29 | 1991-11-26 | Digital Equipment Corporation | High-power, high-performance integrated circuit chip package |
| US6381267B1 (en) | 1999-03-08 | 2002-04-30 | International Business Machines Corporation | Modems, methods, and computer program products for falling back to a lower data rate protocol upon detecting abnormal line conditions during startup |
| US6553518B1 (en) | 1999-03-08 | 2003-04-22 | International Business Machines Corporation | Severe error detectors, methods and computer program products that use constellation specific error event thresholds to detect severe error events during demodulation of a signal comprising symbols from a plurality of symbol constellations |
| US6661837B1 (en) | 1999-03-08 | 2003-12-09 | International Business Machines Corporation | Modems, methods, and computer program products for selecting an optimum data rate using error signals representing the difference between the output of an equalizer and the output of a slicer or detector |
| US6389064B1 (en) | 1999-03-08 | 2002-05-14 | International Business Machines Corporation | Modems, methods, and computer program products for identifying a signaling alphabet in variance with an ideal alphabet due to digital impairments |
| US7003030B2 (en) | 1999-03-08 | 2006-02-21 | Lenovo (Singapore) Pte. Ltd. | Receivers, methods, and computer program products for an analog modem that receives data signals from a digital modem |
| US6487243B1 (en) | 1999-03-08 | 2002-11-26 | International Business Machines Corporation | Modems, methods, and computer program products for recovering from errors in a tone reversal sequence between two modems |
| US6341360B1 (en) | 1999-03-08 | 2002-01-22 | International Business Machines Corporation | Decision feedback equalizers, methods, and computer program products for detecting severe error events and preserving equalizer filter characteristics in response thereto |
| US6661847B1 (en) | 1999-05-20 | 2003-12-09 | International Business Machines Corporation | Systems methods and computer program products for generating and optimizing signal constellations |
| US6823004B1 (en) | 1999-10-29 | 2004-11-23 | International Business Machines Corporation | Methods, systems and computer program products for monitoring performance of a modem during a connection |
| US6611563B1 (en) | 1999-10-29 | 2003-08-26 | International Business Machines Corporation | Systems, methods and computer program products for data mode refinement of modem constellation points |
| US6792040B1 (en) | 1999-10-29 | 2004-09-14 | International Business Machines Corporation | Modems having a dual power mode capability and methods of operating same |
| US6754258B1 (en) | 1999-10-29 | 2004-06-22 | International Business Machines Corporation | Systems, methods and computer program products for averaging learned levels in the presence of digital impairments based on patterns |
| US6650657B1 (en) | 1999-10-29 | 2003-11-18 | International Business Machines Corporation | Systems, methods and computer program products for identifying digital impairments in modem signals |
| US6826157B1 (en) | 1999-10-29 | 2004-11-30 | International Business Machines Corporation | Systems, methods, and computer program products for controlling data rate reductions in a communication device by using a plurality of filters to detect short-term bursts of errors and long-term sustainable errors |
| US6662322B1 (en) | 1999-10-29 | 2003-12-09 | International Business Machines Corporation | Systems, methods, and computer program products for controlling the error rate in a communication device by adjusting the distance between signal constellation points |
| US6967995B1 (en) | 1999-10-29 | 2005-11-22 | International Business Machines Corporation | Methods, systems and computer program products for carrier drop detection using a variable threshold |
| US6505222B1 (en) | 1999-10-29 | 2003-01-07 | International Business Machines Corporation | Systems methods and computer program products for controlling undesirable bias in an equalizer |
| US6823017B1 (en) | 1999-10-29 | 2004-11-23 | International Business Machines Corporation | Systems, methods and computer program products for filtering glitches from measured values in a sequence of code points |
| US6839382B1 (en) | 1999-10-29 | 2005-01-04 | International Business Machines Corporation | System, methods and computer program products for identifying digital impairments in modem signals using signature analysis and signal level comparison analysis |
| US6792004B1 (en) | 1999-10-29 | 2004-09-14 | International Business Machines Corporation | Systems, methods and computer program products for averaging learned levels in the presence of robbed-bit signaling based on proximity |
| US6765955B1 (en) | 1999-10-29 | 2004-07-20 | International Business Machines Corporation | Methods, systems and computer program products establishing a communication configuration for a modem connection to compensate for echo noise |
| US6816545B1 (en) | 1999-10-29 | 2004-11-09 | International Business Machines Corporation | Systems, methods and computer program products for identifying digital impairments in modems based on clusters and/or skips in pulse code modulation signal levels |
| US6807151B1 (en) * | 2000-03-27 | 2004-10-19 | At&T Corp | Apparatus and method for group-wise detection of failure condition |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3447147A (en) * | 1965-06-03 | 1969-05-27 | Northern Electric Co | Encoder |
| FR2085256B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * | 1970-04-02 | 1975-02-21 | Radiotechnique Compelec | |
| US3711650A (en) * | 1970-10-26 | 1973-01-16 | Logicon Inc | Adaptive pulse code modulation system |
| JPS5017711A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * | 1973-06-15 | 1975-02-25 | ||
| IT1021020B (it) * | 1974-05-27 | 1978-01-30 | Telettra Lab Telefon | Sistema e dispositivi di comunica zione con segnali codificati p.c.m. a ridondanza ridotta |
| US4039948A (en) * | 1974-06-19 | 1977-08-02 | Boxall Frank S | Multi-channel differential pulse code modulation system |
| US4002841A (en) * | 1976-01-21 | 1977-01-11 | Bell Telephone Laboratories, Incorporated | Data compression using nearly instantaneous companding in a digital speech interpolation system |
| US4100377A (en) * | 1977-04-28 | 1978-07-11 | Bell Telephone Laboratories, Incorporated | Packet transmission of speech |
-
1978
- 1978-06-22 JP JP7602278A patent/JPS5523603A/ja active Granted
-
1979
- 1979-06-22 US US06/051,291 patent/US4237552A/en not_active Expired - Lifetime
- 1979-06-22 CA CA330,392A patent/CA1124899A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5523603A (en) | 1980-02-20 |
| US4237552A (en) | 1980-12-02 |
| JPS6329460B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1988-06-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |