GB1248639A - Creation of Inventions and Patents with Artificial Intelligence

GB1248639A – Data transmission method and system
– Google Patents

GB1248639A – Data transmission method and system
– Google Patents
Data transmission method and system

Info

Publication number
GB1248639A

GB1248639A
GB21675/69A
GB2167569A
GB1248639A
GB 1248639 A
GB1248639 A
GB 1248639A
GB 21675/69 A
GB21675/69 A
GB 21675/69A
GB 2167569 A
GB2167569 A
GB 2167569A
GB 1248639 A
GB1248639 A
GB 1248639A
Authority
GB
United Kingdom
Prior art keywords
equalizer
output
response
correction
zero
Prior art date
1968-04-30
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

Application number
GB21675/69A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Motorola Solutions Inc

Original Assignee
Codex Corp
Priority date (The priority date 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 date listed.)
1968-04-30
Filing date
1969-04-29
Publication date
1971-10-06

1969-04-29
Application filed by Codex Corp
filed
Critical
Codex Corp

1971-10-06
Publication of GB1248639A
publication
Critical
patent/GB1248639A/en

Status
Expired
legal-status
Critical
Current

Links

Espacenet

Global Dossier

Discuss

Classifications

H—ELECTRICITY

H04—ELECTRIC COMMUNICATION TECHNIQUE

H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION

H04L25/00—Baseband systems

H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines

H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks

H04L25/03006—Arrangements for removing intersymbol interference

H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain

H04L25/03019—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception

H04L25/03038—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception with a non-recursive structure

Abstract

1,248,639. Self-adaptive transversal equalizers. CODEX CORP. 29 April, 1969 [30 April, 1968], No. 21675/69. Addition to 1,178,769. Heading H4R. In an adaptive transversal equalizer of the type of Specification 1,178,769, in which the multipliers of a tapped delay line, or its digital equivalent, are adjusted in response to the determination of errors between the equalized signal and the transmitted signal, and in which the correction signal for adjusting the multipliers is derived by determining the error signals relating to sampling times over a range of sampling times spaced about the sampling time appropriate to the multiplier being adjusted and summing the errors, appropriately weighted in accordance with their time of occurrence. The error signals are determined as the difference between the equalizer output after it has been quantized to provide the receiver output, and the equalizer output as applied to the quantizer. A preferred system uses the unequalized input samples as the weights applied to the error signals to provide the correcting value. The general formula for the correcting value to achieve universal convergence is where Zkvis the equalizer output sample; Kk is the desired output value, equal to the quantized output; Y k-i is the input to the equalizer; C i v is the correction factor with the superscript v indicating the vth step of forming a correction factor and i is the particular tap whose multiplier is being adjusted; f 1 and f 2 are odd, monotonic, non-decreasing functions whose value is zero when the argument is zero and in the preferred arrangement referred to above f 1 (x) = f 2 (x) = x. With a small scale factor, the addition of the correction factors to the multiplier coefficients accomplishes the summing of the weighted error terms and the formula for the correction value reduces to for the preferred arrangement. The transmission system employed may be the same as that described in the parent Application and the desired impulse response may be one for k = 0 and zero for all other values of k. Alternatively, for equalizing circuits having serious phase jitter and where the pulse signals are carrier modulated, as in telephone lines, the desired response has a mull in the pulse spectrum, allowing the carrier frequency to be placed at this null and a much wider band phase look loop to be used for carrier synchronization. In this case the equalizer has a desired response which is +1, 0, – 1 about the centre, or +1, 0, 0, 0, – 1. Other forms of response are also suggested to provide easier timing recovery, multiplexing, and removal of phase jitter, and the modifications of the error calculator to accommodate these alternatives are suggested.

GB21675/69A
1968-04-30
1969-04-29
Data transmission method and system

Expired

GB1248639A
(en)

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

US72531268A

1968-04-30
1968-04-30

Publications (1)

Publication Number
Publication Date

GB1248639A
true

GB1248639A
(en)

1971-10-06

Family
ID=24914033
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB21675/69A
Expired

GB1248639A
(en)

1968-04-30
1969-04-29
Data transmission method and system

Country Status (5)

Country
Link

US
(1)

US3614622A
(en)

DE
(1)

DE1922224A1
(en)

FR
(1)

FR2007571A6
(en)

GB
(1)

GB1248639A
(en)

NL
(1)

NL6906608A
(en)

Families Citing this family (21)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

CH524287A
(en)

1970-09-25
1972-06-15
Patelhold Patentverwertung

Method for the automatic setting of a transversal filter for pulse equalization

US3699321A
(en)

1971-04-01
1972-10-17
North American Rockwell
Automatic adaptive equalizer implementation amenable to mos

USRE33056E
(en)

1971-09-14
1989-09-12
Codex Corporation
Signal structures for double side band-quadrature carrier modulation

US3887768A
(en)

1971-09-14
1975-06-03
Codex Corp
Signal structures for double side band-quadrature carrier modulation

US3760167A
(en)

1972-03-16
1973-09-18
Honeywell Inf Systems
Phase jitter special purpose computer

US3829780A
(en)

1972-11-14
1974-08-13
Rockwell International Corp
Data modem with adaptive feedback equalization for cancellation of lead-in and trailing transients

US3875515A
(en)

1973-06-19
1975-04-01
Rixon
Automatic equalizer with decision directed feedback

CH599727A5
(en)

1974-12-06
1978-05-31
Gretag Ag

US3999129A
(en)

1975-04-16
1976-12-21
Rolm Corporation
Method and apparatus for error reduction in digital information transmission systems

US4038494A
(en)

1975-06-17
1977-07-26
Fmc Corporation
Digital serial transmitter/receiver module

US4019140A
(en)

1975-10-24
1977-04-19
Bell Telephone Laboratories, Incorporated
Methods and apparatus for reducing intelligible crosstalk in single sideband radio systems

US4187466A
(en)

1978-01-16
1980-02-05
Rolm Corporation
Signal injection technique

JPS5744339A
(en)

1980-08-29
1982-03-12
Hitachi Ltd
Signal processing system

US5854907A
(en)

1982-02-22
1998-12-29
Texas Instruments Incorporated
Microcomputer for digital signal processing having on-chip memory and external memory access

US5164959A
(en)

1991-01-22
1992-11-17
Hughes Aircraft Company
Digital equalization method and apparatus

US5268848A
(en)

1992-09-30
1993-12-07
International Business Machines Corporation
Equalizer adjustment for partial-response maximum-likelihood disk drive systems

US5511119A
(en)

1993-02-10
1996-04-23
Bell Communications Research, Inc.
Method and system for compensating for coupling between circuits of quaded cable in a telecommunication transmission system

US6678311B2
(en)

1996-05-28
2004-01-13
Qualcomm Incorporated
High data CDMA wireless communication system using variable sized channel codes

US5970099A
(en)

1997-06-06
1999-10-19
Advanced Micro Devices, Inc.
Silent polarity reversal in a communication system

FR2802735B1
(en)

1999-12-20
2002-03-29
Canon Kk

ENCODING METHOD AND DEVICE, DECODING METHOD AND DEVICE, AND SYSTEMS USING THE SAME

US6813589B2
(en)

2001-11-29
2004-11-02
Wavecrest Corporation
Method and apparatus for determining system response characteristics

Family Cites Families (10)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US3177349A
(en)

1960-10-31
1965-04-06
Mcdonnell Aircraft Corp
Filter network

US3307152A
(en)

1963-05-31
1967-02-28
Gen Electric
Data transmission system with control character insertions

US3430145A
(en)

1965-04-16
1969-02-25
Honeywell Inc
Separation of harmonic bands of a signal by inserting amplitude related pulses between sampling pulses

US3368168A
(en)

1965-06-02
1968-02-06
Bell Telephone Labor Inc
Adaptive equalizer for digital transmission systems having means to correlate present error component with past, present and future received data bits

US3375473A
(en)

1965-07-15
1968-03-26
Bell Telephone Labor Inc
Automatic equalizer for analog channels having means for comparing two test pulses, one pulse traversing the transmission channel and equalizer

US3414819A
(en)

1965-08-27
1968-12-03
Bell Telephone Labor Inc
Digital adaptive equalizer system

US3414845A
(en)

1965-09-28
1968-12-03
Bell Telephone Labor Inc
Automatic equalizer for digital transmission systems utilizing error control information

US3390336A
(en)

1966-01-24
1968-06-25
Cardion Electronics Inc
Apparatus and method for converting an input wave signal using adaptive network adjusted to time inverse of translating channel

US3440548A
(en)

1966-10-06
1969-04-22
Bell Telephone Labor Inc
Timing recovery circuit using time derivative of data signals

US3508153A
(en)

1967-09-11
1970-04-21
Bell Telephone Labor Inc
Automatic equalizer for partial-response data transmission systems

1968

1968-04-30
US
US725312A
patent/US3614622A/en
not_active
Expired – Lifetime

1969

1969-04-29
GB
GB21675/69A
patent/GB1248639A/en
not_active
Expired

1969-04-29
NL
NL6906608A
patent/NL6906608A/xx
unknown

1969-04-30
DE
DE19691922224
patent/DE1922224A1/en
active
Pending

1969-04-30
FR
FR6913962A
patent/FR2007571A6/fr
not_active
Expired

Also Published As

Publication number
Publication date

US3614622A
(en)

1971-10-19

DE1922224A1
(en)

1970-09-17

NL6906608A
(en)

1969-11-03

FR2007571A6
(en)

1970-01-09

Contact information