GB2022954A - Transversal filters - Google Patents

Transversal filters

Info

Publication number
GB2022954A
GB2022954A GB7921704A GB7921704A GB2022954A GB 2022954 A GB2022954 A GB 2022954A GB 7921704 A GB7921704 A GB 7921704A GB 7921704 A GB7921704 A GB 7921704A GB 2022954 A GB2022954 A GB 2022954A
Authority
GB
United Kingdom
Prior art keywords
signal
tap point
central tap
filter
points
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.)
Granted
Application number
GB7921704A
Other versions
GB2022954B (en
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.)
UK Secretary of State for Defence
Original Assignee
UK Secretary of State for Defence
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.)
Filing date
Publication date
Application filed by UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Priority to GB7921704A priority Critical patent/GB2022954B/en
Publication of GB2022954A publication Critical patent/GB2022954A/en
Application granted granted Critical
Publication of GB2022954B publication Critical patent/GB2022954B/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H21/00—Adaptive networks
    • H03H21/0012—Digital adaptive filters
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Noise Elimination (AREA)
  • Filters That Use Time-Delay Elements (AREA)

Abstract

An adaptive transversal filter for use in rejecting interference comprises: a tapped delay line having a central tap point (1) and further tap points (2A, 2R; 3A, 3R; 4A, 4R; 5A, 5R) in pairs symmetrically disposed with respect to the central tap point; means (10-13, 14) for weighting and then summing the signals from the further tap points, the two signals from each pair of points being equally weighted; means (16) for subtracting the weighted sum from the signal received from the central tap point; and control means (17-20) for estimating the correlation between the output signal from the subtraction means and the input signal and deriving from these correlations weighting coefficients for the weighted sum. Because the weighting coefficients are applied in a symmetrical way relative to the central tap point of the delay line, no phase distortion is introduced by the filter. The filter may be used to remove noise from a comparatively well correlated and stable signal, or to remove highly correlated interference from a relatively uncorrelated signal, eg a speech signal. <IMAGE>
GB7921704A 1978-03-30 1979-06-21 Transversal filters Expired GB2022954B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7921704A GB2022954B (en) 1978-03-30 1979-06-21 Transversal filters

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1255078 1978-03-30
GB7921704A GB2022954B (en) 1978-03-30 1979-06-21 Transversal filters

Publications (2)

Publication Number Publication Date
GB2022954A true GB2022954A (en) 1979-12-19
GB2022954B GB2022954B (en) 1982-04-07

Family

ID=26249091

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7921704A Expired GB2022954B (en) 1978-03-30 1979-06-21 Transversal filters

Country Status (1)

Country Link
GB (1) GB2022954B (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3216143A1 (en) * 1982-04-30 1983-11-03 Philips Patentverwaltung Gmbh, 2000 Hamburg Arrangement for calculating convolution values
US4502074A (en) * 1981-11-09 1985-02-26 Rca Corporation Digital television signal processing system
US4524423A (en) * 1981-11-06 1985-06-18 Rca Corporation Digital signal separation filters
US4528513A (en) * 1983-04-25 1985-07-09 Rca Corporation Digital FM ratio detector with gain-controlled filter
US4573135A (en) * 1983-04-25 1986-02-25 Rca Corporation Digital lowpass filter having controllable gain
EP0368307A2 (en) * 1988-11-10 1990-05-16 Nec Corporation Demodulator with composite transversal equalizer and eye detection clock synchronizer
DE3916256A1 (en) * 1989-05-18 1990-11-22 Ant Nachrichtentech Digital filter with attenuation and phase equalising - consists of non-recursive group transit time equaliser, and attenuation equaliser
WO1997016942A1 (en) * 1995-10-30 1997-05-09 British Broadcasting Corporation Method and apparatus for reduction of unwanted feedback
WO2004047329A1 (en) * 2002-11-18 2004-06-03 Gossett And Gunter, Inc. A method and system for autocorrelation filtering
US6982945B1 (en) 2001-01-26 2006-01-03 Google, Inc. Baseband direct sequence spread spectrum transceiver
US7453921B1 (en) 2001-12-11 2008-11-18 Google Inc. LPC filter for removing periodic and quasi-periodic interference from spread spectrum signals
US7545849B1 (en) 2003-03-28 2009-06-09 Google Inc. Signal spectrum spreading and combining system and method
US7627287B2 (en) 2005-05-20 2009-12-01 British Broadcasting Corporation On-channel repeater

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8385470B2 (en) 2000-12-05 2013-02-26 Google Inc. Coding a signal with a shuffled-Hadamard function
US8374218B2 (en) 2000-12-05 2013-02-12 Google Inc. Combining signals with a shuffled-hadamard function

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4524423A (en) * 1981-11-06 1985-06-18 Rca Corporation Digital signal separation filters
US4502074A (en) * 1981-11-09 1985-02-26 Rca Corporation Digital television signal processing system
DE3216143A1 (en) * 1982-04-30 1983-11-03 Philips Patentverwaltung Gmbh, 2000 Hamburg Arrangement for calculating convolution values
US4528513A (en) * 1983-04-25 1985-07-09 Rca Corporation Digital FM ratio detector with gain-controlled filter
US4573135A (en) * 1983-04-25 1986-02-25 Rca Corporation Digital lowpass filter having controllable gain
EP0368307A2 (en) * 1988-11-10 1990-05-16 Nec Corporation Demodulator with composite transversal equalizer and eye detection clock synchronizer
EP0368307A3 (en) * 1988-11-10 1991-11-21 Nec Corporation Demodulator with composite transversal equalizer and eye detection clock synchronizer
DE3916256A1 (en) * 1989-05-18 1990-11-22 Ant Nachrichtentech Digital filter with attenuation and phase equalising - consists of non-recursive group transit time equaliser, and attenuation equaliser
WO1997016942A1 (en) * 1995-10-30 1997-05-09 British Broadcasting Corporation Method and apparatus for reduction of unwanted feedback
US6982945B1 (en) 2001-01-26 2006-01-03 Google, Inc. Baseband direct sequence spread spectrum transceiver
US7453921B1 (en) 2001-12-11 2008-11-18 Google Inc. LPC filter for removing periodic and quasi-periodic interference from spread spectrum signals
WO2004047329A1 (en) * 2002-11-18 2004-06-03 Gossett And Gunter, Inc. A method and system for autocorrelation filtering
US7352833B2 (en) 2002-11-18 2008-04-01 Google Inc. Method and system for temporal autocorrelation filtering
US7733943B2 (en) 2002-11-18 2010-06-08 Google Inc. Method and system for temporal autocorrelation filtering
US7545849B1 (en) 2003-03-28 2009-06-09 Google Inc. Signal spectrum spreading and combining system and method
US7627287B2 (en) 2005-05-20 2009-12-01 British Broadcasting Corporation On-channel repeater

Also Published As

Publication number Publication date
GB2022954B (en) 1982-04-07

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19950621