WO1997016909A3 - Detection of multitone signals - Google Patents

Detection of multitone signals Download PDF

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Publication number
WO1997016909A3
WO1997016909A3 PCT/GB1996/002637 GB9602637W WO9716909A3 WO 1997016909 A3 WO1997016909 A3 WO 1997016909A3 GB 9602637 W GB9602637 W GB 9602637W WO 9716909 A3 WO9716909 A3 WO 9716909A3
Authority
WO
WIPO (PCT)
Prior art keywords
samples
detection
multitone
multitone signals
decoded
Prior art date
Application number
PCT/GB1996/002637
Other languages
French (fr)
Other versions
WO1997016909A2 (en
WO1997016909B1 (en
Inventor
Peter John Garrard
Peter Hibbittt
Original Assignee
Advanced Tech Uk Ltd
Peter John Garrard
Peter Hibbittt
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 Advanced Tech Uk Ltd, Peter John Garrard, Peter Hibbittt filed Critical Advanced Tech Uk Ltd
Publication of WO1997016909A2 publication Critical patent/WO1997016909A2/en
Publication of WO1997016909A3 publication Critical patent/WO1997016909A3/en
Publication of WO1997016909B1 publication Critical patent/WO1997016909B1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/30—Systems using multi-frequency codes wherein each code element is represented by a combination of frequencies

Abstract

A means is disclosed for the communication of data over noisy channels, in particular, using multitone signals. The receiver samples the signal for a period substantially longer than 40 ms, and the samples are decoded, if possible, to multitone symbols. A signal is accepted as valid when at least some predetermined numbers of the samples are decoded to the same symbol.
PCT/GB1996/002637 1995-10-31 1996-10-30 Detection of multitone signals WO1997016909A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9522243A GB2306723A (en) 1995-10-31 1995-10-31 Data communication
GB9522243.6 1995-10-31

Publications (3)

Publication Number Publication Date
WO1997016909A2 WO1997016909A2 (en) 1997-05-09
WO1997016909A3 true WO1997016909A3 (en) 1997-07-10
WO1997016909B1 WO1997016909B1 (en) 1997-08-07

Family

ID=10783137

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1996/002637 WO1997016909A2 (en) 1995-10-31 1996-10-30 Detection of multitone signals

Country Status (2)

Country Link
GB (1) GB2306723A (en)
WO (1) WO1997016909A2 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981001623A1 (en) * 1979-11-28 1981-06-11 Motorola Inc Programmable multifrequency tone receiver
US5218636A (en) * 1991-03-07 1993-06-08 Dialogic Corporation Dial pulse digit detector
EP0547373A1 (en) * 1991-11-25 1993-06-23 Motorola, Inc. A circuit and method for dual-tone multifrequency detection
EP0550144A1 (en) * 1991-12-31 1993-07-07 AT&T Corp. Method and apparatus for detection of a control signal in a communication system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2091460B (en) * 1981-01-16 1985-06-05 Matsushita Electric Works Ltd Asynchronous type multichannel signal processing system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981001623A1 (en) * 1979-11-28 1981-06-11 Motorola Inc Programmable multifrequency tone receiver
US5218636A (en) * 1991-03-07 1993-06-08 Dialogic Corporation Dial pulse digit detector
EP0547373A1 (en) * 1991-11-25 1993-06-23 Motorola, Inc. A circuit and method for dual-tone multifrequency detection
EP0550144A1 (en) * 1991-12-31 1993-07-07 AT&T Corp. Method and apparatus for detection of a control signal in a communication system

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
"Table-driven dual-tone multi-frequency receiver", IBM TECHNICAL DISCLOSURE BULLETIN, vol. 34, no. 11, April 1992 (1992-04-01), NEW YORK US, pages 107 - 112, XP000303199 *
BRAYNINA: "A method of designing adaptive group digital multichannel 'two-of-six' code receivers for PCM signals.", TELECOMMUNICATIONS AND RADIO ENGINEERING, vol. 47, no. 2, February 1992 (1992-02-01), WASHINGTON US, pages 8 - 14, XP000332555 *
MESSER FUNDERBURK D ET AL.: "A high performance DTMF detection method for digital telephone and telecommunication systems", PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON CONSUMER ELECTRONICS, 2 June 1992 (1992-06-02) - 4 June 1992 (1992-06-04), NEW YORK, US, pages 200 - 201, XP000369234 *

Also Published As

Publication number Publication date
GB2306723A (en) 1997-05-07
GB9522243D0 (en) 1996-01-03
WO1997016909A2 (en) 1997-05-09

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