WO2006129061A3 - Phase difference calculator - Google Patents

Phase difference calculator Download PDF

Info

Publication number
WO2006129061A3
WO2006129061A3 PCT/GB2006/001859 GB2006001859W WO2006129061A3 WO 2006129061 A3 WO2006129061 A3 WO 2006129061A3 GB 2006001859 W GB2006001859 W GB 2006001859W WO 2006129061 A3 WO2006129061 A3 WO 2006129061A3
Authority
WO
WIPO (PCT)
Prior art keywords
phase difference
phase
converter
shorter
window
Prior art date
Application number
PCT/GB2006/001859
Other languages
French (fr)
Other versions
WO2006129061A2 (en
Inventor
Bahador Pakbaz
Original Assignee
Tecteon Plc
Bahador Pakbaz
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 Tecteon Plc, Bahador Pakbaz filed Critical Tecteon Plc
Priority to CA002611302A priority Critical patent/CA2611302A1/en
Publication of WO2006129061A2 publication Critical patent/WO2006129061A2/en
Publication of WO2006129061A3 publication Critical patent/WO2006129061A3/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
    • G01R25/005—Circuits for comparing several input signals and for indicating the result of this comparison, e.g. equal, different, greater, smaller, or for passing one of the input signals as output signal
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/16—Spectrum analysis; Fourier analysis
    • G01R23/165—Spectrum analysis; Fourier analysis using filters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
    • H04B3/23—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
    • H04B3/23—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers
    • H04B3/231—Echo cancellers using readout of a memory to provide the echo replica
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
    • H04B3/23—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers
    • H04B3/232—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers using phase shift, phase roll or frequency offset correction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J99/00—Subject matter not provided for in other groups of this subclass
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/06—Demodulator circuits; Receiver circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/58—Anti-side-tone circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/738—Interface circuits for coupling substations to external telephone lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/16—Spectrum analysis; Fourier analysis

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Complex Calculations (AREA)
  • Measuring Phase Differences (AREA)
  • Telephone Function (AREA)

Abstract

A phase reversal detector converts an input tone from time domain into frequency domain, determines a phase difference over a time interval, and detects a phase reversa based on the phase difference. The converter derives a Fourier transform coefficient having a centre frequency corresponding approximately to a principal frequency being sought in the incoming signal. It uses a very short window of samples, the window length being selected to be shorter than that required for an exact correspondence. By using an approximate correspondence a much shorter window can be used, which enables a significant reduction in computational load and a shorter detection time. The converter output is a complex number. The phase difference is obtained using a dot product of the outputs of the converter obtained at different times. An average of consecutive phase differences can be used to reduce the effect of noise.
PCT/GB2006/001859 2005-06-01 2006-05-19 Phase difference calculator WO2006129061A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA002611302A CA2611302A1 (en) 2005-06-01 2006-05-19 Phase difference calculator

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0511161.2 2005-06-01
GB0511161A GB2440589A (en) 2005-06-01 2005-06-01 Phase difference calculator

Publications (2)

Publication Number Publication Date
WO2006129061A2 WO2006129061A2 (en) 2006-12-07
WO2006129061A3 true WO2006129061A3 (en) 2007-01-18

Family

ID=34834961

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2006/001859 WO2006129061A2 (en) 2005-06-01 2006-05-19 Phase difference calculator

Country Status (3)

Country Link
CA (1) CA2611302A1 (en)
GB (1) GB2440589A (en)
WO (1) WO2006129061A2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2440589A (en) * 2005-06-01 2008-02-06 Tecteon Plc Phase difference calculator
US8625776B2 (en) 2009-09-23 2014-01-07 Polycom, Inc. Detection and suppression of returned audio at near-end
CN108037363B (en) * 2018-01-30 2023-08-01 吉林省广播电视研究所(吉林省新闻出版广电局科技信息中心) Device and method for measuring phase difference of electronic signals
WO2021090466A1 (en) * 2019-11-08 2021-05-14 三菱電機株式会社 Phase synchronization circuit and in-phase distribution circuit
CN114900399A (en) * 2022-05-09 2022-08-12 中山大学 Method and system for detecting phase difference related signals based on deep learning

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4658420A (en) * 1983-12-06 1987-04-14 Nec Corporation Tone responsible disabler circuit for an echo canceller
DE3641590A1 (en) * 1986-12-05 1988-06-16 Siemens Ag Phase shift detector
WO1994018759A1 (en) * 1993-02-09 1994-08-18 Italtel Societa' Italiana Telecomunicazioni S.P.A. Process and device for the detection of disabling tone of the echo canceller in a telephone switching exchange
JPH06311192A (en) * 1993-04-22 1994-11-04 Kokusai Electric Co Ltd Digital demodulator
US6199036B1 (en) * 1999-08-25 2001-03-06 Nortel Networks Limited Tone detection using pitch period
US20020154764A1 (en) * 2001-02-16 2002-10-24 Jamil Ahmad Tone detection and echo cancellation in a communications network

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2161042C (en) * 1995-10-20 2001-08-28 John Miller Digital phase reversal detector
US5815568A (en) * 1996-01-31 1998-09-29 Telefoanktiebolaget Lm Ericsson Disabling tone detector for network echo canceller
US6055310A (en) * 1997-12-17 2000-04-25 Nortel Networks Corporation Phase reversal tone detector using DSP
GB2440589A (en) * 2005-06-01 2008-02-06 Tecteon Plc Phase difference calculator

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4658420A (en) * 1983-12-06 1987-04-14 Nec Corporation Tone responsible disabler circuit for an echo canceller
DE3641590A1 (en) * 1986-12-05 1988-06-16 Siemens Ag Phase shift detector
WO1994018759A1 (en) * 1993-02-09 1994-08-18 Italtel Societa' Italiana Telecomunicazioni S.P.A. Process and device for the detection of disabling tone of the echo canceller in a telephone switching exchange
JPH06311192A (en) * 1993-04-22 1994-11-04 Kokusai Electric Co Ltd Digital demodulator
US6199036B1 (en) * 1999-08-25 2001-03-06 Nortel Networks Limited Tone detection using pitch period
US20020154764A1 (en) * 2001-02-16 2002-10-24 Jamil Ahmad Tone detection and echo cancellation in a communications network

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 02 31 March 1995 (1995-03-31) *

Also Published As

Publication number Publication date
GB0511161D0 (en) 2005-07-06
CA2611302A1 (en) 2006-12-07
GB2440589A (en) 2008-02-06
WO2006129061A2 (en) 2006-12-07

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