TW332367B - Cooperative feedback system and method for a compensation system associated with a transmitter or codec - Google Patents
Cooperative feedback system and method for a compensation system associated with a transmitter or codecInfo
- Publication number
- TW332367B TW332367B TW086107907A TW86107907A TW332367B TW 332367 B TW332367 B TW 332367B TW 086107907 A TW086107907 A TW 086107907A TW 86107907 A TW86107907 A TW 86107907A TW 332367 B TW332367 B TW 332367B
- Authority
- TW
- Taiwan
- Prior art keywords
- digital data
- transmitter
- data frames
- digital
- compensation
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B14/00—Transmission systems not characterised by the medium used for transmission
- H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
- H04B14/04—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse code modulation
- H04B14/046—Systems or methods for reducing noise or bandwidth
- H04B14/048—Non linear compression or expansion
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/12—Arrangements providing for calling or supervisory signals
- H04J3/125—One of the channel pulses or the synchronisation pulse is also used for transmitting monitoring or supervisory signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
- H04L25/4917—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes
- H04L25/4927—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems using multilevel codes using levels matched to the quantisation levels of the channel
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Nonlinear Science (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/697,371 US5754594A (en) | 1996-08-23 | 1996-08-23 | Cooperative feedback system and method for a compensation system associated with a transmitter or codec |
Publications (1)
Publication Number | Publication Date |
---|---|
TW332367B true TW332367B (en) | 1998-05-21 |
Family
ID=24800878
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
TW086107907A TW332367B (en) | 1996-08-23 | 1997-06-07 | Cooperative feedback system and method for a compensation system associated with a transmitter or codec |
Country Status (5)
Country | Link |
---|---|
US (2) | US5754594A (zh) |
EP (1) | EP0920750B1 (zh) |
DE (1) | DE69736181T2 (zh) |
TW (1) | TW332367B (zh) |
WO (1) | WO1998008318A1 (zh) |
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US6233275B1 (en) | 1994-12-09 | 2001-05-15 | Brent Townshend | High speed communications system for analog subscriber connections |
AU701274B2 (en) | 1994-12-09 | 1999-01-21 | Brent Townshend | High speed communications system for analog subscriber connections |
US5970103A (en) * | 1996-09-06 | 1999-10-19 | Townshend; Brent | High speed communications system for analog subscriber connections |
US6327301B1 (en) * | 1997-03-03 | 2001-12-04 | Vocal Technologies, Ltd. | Detection and adaptation to digital network impairments by PCM modems |
US6480549B1 (en) | 1997-04-08 | 2002-11-12 | Vocal Technologies, Ltd. | Method for determining attenuation in a digital PCM channel |
US6195414B1 (en) * | 1997-04-17 | 2001-02-27 | Telecom Analysis Systems | Digital facility simulator with CODEC emulation |
US6201842B1 (en) * | 1997-12-29 | 2001-03-13 | Motorola Inc. | Device and method for detecting PCM upstream digital impairments in a communication network |
US6023493A (en) * | 1998-01-20 | 2000-02-08 | Conexant Systems, Inc. | Method and apparatus for synchronizing a data communication system to a periodic digital impairment |
US6643270B1 (en) | 1998-03-03 | 2003-11-04 | Vocal Technologies, Ltd | Method of compensating for systemic impairments in a telecommunications network |
US6721279B1 (en) | 1999-02-02 | 2004-04-13 | Pctel, Inc. | Method and apparatus for adaptive PCM level estimation and constellation training |
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 |
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 |
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 |
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 |
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 |
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 |
DE19922172B4 (de) * | 1999-05-12 | 2005-06-02 | Infineon Technologies Ag | Verfahren und Vorrichtung zum Erkennen und Korrigieren von digitalen PCM-Codewörtern innerhalb eines übertragenen Datenstroms |
US6661847B1 (en) | 1999-05-20 | 2003-12-09 | International Business Machines Corporation | Systems methods and computer program products for generating and optimizing signal constellations |
US6594306B1 (en) * | 1999-09-03 | 2003-07-15 | Motorola, Inc. | Method and apparatus for a start-up procedure for digital and analog modems utilizing pulse code modulation for data transmission |
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 |
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 |
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 |
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 |
US6792040B1 (en) | 1999-10-29 | 2004-09-14 | International Business Machines Corporation | Modems having a dual power mode capability and methods of operating same |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
US7088781B2 (en) * | 1999-12-15 | 2006-08-08 | Paradyne Corporation | Tone ordered discrete multitone interleaver |
US7099401B2 (en) * | 1999-12-15 | 2006-08-29 | Paradyne Corporation | Discrete multitone interleaver |
US6266376B1 (en) * | 2000-02-04 | 2001-07-24 | Motorola, Inc. | System and method for adjusting PCM data frames for robbed bit signaling in a telephone network |
US6892149B2 (en) * | 2001-05-31 | 2005-05-10 | Intel Corporation | Identifying data loss in a transmission system |
US20040157548A1 (en) * | 2003-02-06 | 2004-08-12 | Eyer Mark Kenneth | Home network interface legacy device adapter |
EP1825621B1 (en) * | 2004-12-17 | 2012-03-21 | Telchemy, Inc. | System and method for improving the quality of real time multimedia sessions |
US7591075B2 (en) * | 2006-09-28 | 2009-09-22 | Techtronic Power Tools Technology Limited | Self-leveling mechanism |
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US3452330A (en) * | 1967-07-25 | 1969-06-24 | Bell Telephone Labor Inc | Asynchronous data transmission system with error detection and retransmission |
JPS5842328A (ja) * | 1981-09-07 | 1983-03-11 | Hitachi Ltd | 遠隔折返し制御方式 |
JPS58219847A (ja) * | 1982-06-14 | 1983-12-21 | Ricoh Co Ltd | 再送要求機能付データ通信方式 |
US4571736A (en) * | 1983-10-31 | 1986-02-18 | University Of Southwestern Louisiana | Digital communication system employing differential coding and sample robbing |
JPS60101769A (ja) * | 1983-11-09 | 1985-06-05 | Hitachi Ltd | 信号伝送装置 |
JPH0618358B2 (ja) * | 1985-04-09 | 1994-03-09 | 沖電気工業株式会社 | 誤り制御符号化方式 |
US4885755A (en) * | 1985-04-10 | 1989-12-05 | Canon Kabushiki Kaisha | Method and apparatus for data communication |
US4928276A (en) * | 1986-09-02 | 1990-05-22 | Ag Communication Systems Corporation | T1 line format for robbed signaling for use with CCITT 32K bit per second ADPCM clear channel transmission and 64KBPS clear channel transmission |
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JP2685783B2 (ja) * | 1988-03-09 | 1997-12-03 | 株式会社東芝 | 誤り制御方式 |
US4856030A (en) * | 1988-07-20 | 1989-08-08 | Itt Defense Communications | Apparatus and methods of locking a receiving modem to a transmitting modem employing a burst signal |
US5263081A (en) * | 1989-11-01 | 1993-11-16 | Hubbell Incorporated | Method and apparatus for providing on-hook transmission for digital loop carrier channel units |
EP0503545B1 (en) * | 1991-03-08 | 1997-06-11 | Matsushita Electric Industrial Co., Ltd. | Data transfer device |
US5491695A (en) * | 1991-07-17 | 1996-02-13 | Digital Access Corporation | Means and method of dial up bridging of network for high bandwidth digital communication |
US5282197A (en) * | 1992-05-15 | 1994-01-25 | International Business Machines | Low frequency audio sub-channel embedded signalling |
US5577196A (en) * | 1993-04-07 | 1996-11-19 | Sprint Communications Co. L.P. | Intelligent digital signal hitless protection switch |
US5506956A (en) * | 1993-04-07 | 1996-04-09 | Sprint Communications Company L.P. | Error correction and channel restoration apparatus for T1 digital links |
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US5406583A (en) * | 1993-06-21 | 1995-04-11 | At&T Corp. | Modem with received signals and transmitted signals comprising signal sets |
JP2959353B2 (ja) * | 1993-09-07 | 1999-10-06 | 三菱電機株式会社 | エコーキャンセラ装置 |
US5422876A (en) * | 1993-09-07 | 1995-06-06 | Southwestern Bell Technology Resources, Inc. | Out-of-band loopback control scheme |
US5528625A (en) * | 1994-01-03 | 1996-06-18 | At&T Corp. | High speed quantization-level-sampling modem with equalization arrangement |
US5577105A (en) * | 1994-03-11 | 1996-11-19 | U.S. Robotics, Inc. | Telephone call routing and switching techniques for data communications |
US5724393A (en) * | 1995-02-17 | 1998-03-03 | Lucent Technologies Inc. | Method and apparatus compensating for effects of digital loss insertion in signal transmissions between modems |
-
1996
- 1996-08-23 US US08/697,371 patent/US5754594A/en not_active Expired - Lifetime
-
1997
- 1997-05-05 WO PCT/US1997/007582 patent/WO1998008318A1/en active IP Right Grant
- 1997-05-05 EP EP97925456A patent/EP0920750B1/en not_active Expired - Lifetime
- 1997-05-05 DE DE69736181T patent/DE69736181T2/de not_active Expired - Lifetime
- 1997-06-07 TW TW086107907A patent/TW332367B/zh active
- 1997-09-23 US US08/935,688 patent/US5930300A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US5754594A (en) | 1998-05-19 |
EP0920750A1 (en) | 1999-06-09 |
EP0920750A4 (en) | 2003-06-04 |
WO1998008318A1 (en) | 1998-02-26 |
US5930300A (en) | 1999-07-27 |
DE69736181T2 (de) | 2007-05-03 |
EP0920750B1 (en) | 2006-06-21 |
DE69736181D1 (de) | 2006-08-03 |
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