CA2270103A1 - Recognition of a single frequency tone - Google Patents

Recognition of a single frequency tone Download PDF

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Publication number
CA2270103A1
CA2270103A1 CA002270103A CA2270103A CA2270103A1 CA 2270103 A1 CA2270103 A1 CA 2270103A1 CA 002270103 A CA002270103 A CA 002270103A CA 2270103 A CA2270103 A CA 2270103A CA 2270103 A1 CA2270103 A1 CA 2270103A1
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CA
Canada
Prior art keywords
signal
correlation coefficients
auto
tone
regressive
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
CA002270103A
Other languages
French (fr)
Other versions
CA2270103C (en
Inventor
Eric Verreault
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.)
Nokia Canada Inc
Original Assignee
Newbridge Networks 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.)
Filing date
Publication date
Application filed by Newbridge Networks Corp filed Critical Newbridge Networks Corp
Priority to CA 2270103 priority Critical patent/CA2270103C/en
Priority to US09/299,604 priority patent/US6694010B1/en
Publication of CA2270103A1 publication Critical patent/CA2270103A1/en
Application granted granted Critical
Publication of CA2270103C publication Critical patent/CA2270103C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • 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

Abstract

A fast-converging, computationally simple, method for recognizing a single frequency tone or a sinusoid in a signal without prior knowledge of the tone frequency. The method employs a second order or higher auto-regressive model and includes: (a) sampling the signal at a constant sampling rate, and, for each sample, recursively determining a finite number of correlation coefficients using a time-reversed, exponentially weighted, future sliding equivalent of the signal, wherein the correlation coefficients are determined using pre--existing values of the correlation coefficients determined in a previous iteration, a current sample of the signal and at least two consecutively previous samples of the signal; (b) periodically determining at least the second auto-regressive coefficient modelling the signal using the correlation coefficients; and (c) recognizing the presence of the tone based on the value of the second auto-regressive coefficient.
CA 2270103 1999-04-23 1999-04-23 Recognition of a single frequency tone Expired - Fee Related CA2270103C (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA 2270103 CA2270103C (en) 1999-04-23 1999-04-23 Recognition of a single frequency tone
US09/299,604 US6694010B1 (en) 1999-04-23 1999-04-27 Recognition of a single frequency tone

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA 2270103 CA2270103C (en) 1999-04-23 1999-04-23 Recognition of a single frequency tone
US09/299,604 US6694010B1 (en) 1999-04-23 1999-04-27 Recognition of a single frequency tone

Publications (2)

Publication Number Publication Date
CA2270103A1 true CA2270103A1 (en) 2000-10-23
CA2270103C CA2270103C (en) 2007-10-23

Family

ID=32394598

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2270103 Expired - Fee Related CA2270103C (en) 1999-04-23 1999-04-23 Recognition of a single frequency tone

Country Status (2)

Country Link
US (1) US6694010B1 (en)
CA (1) CA2270103C (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7035394B2 (en) * 2001-12-17 2006-04-25 Ricoh Company, Ltd. Tone detector judging a detection of a predetermined tone signal by comparing a characteristic quantity of the tone signal with characteristic quantities of other signals
US6961551B2 (en) * 2002-02-01 2005-11-01 M/A-Com Private Radio Systems, Inc. Dual speed squelch circuit and method
US7278043B2 (en) * 2002-03-06 2007-10-02 Qualcomm Incorporated System, method, and apparatus for overload detection in real-time data processing applications
US7184416B2 (en) * 2002-05-22 2007-02-27 Intel Corporation Techniques to cancel echo tail
US8775168B2 (en) * 2006-08-10 2014-07-08 Stmicroelectronics Asia Pacific Pte, Ltd. Yule walker based low-complexity voice activity detector in noise suppression systems

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69331732T2 (en) 1993-04-29 2003-02-06 Ibm Arrangement and method for determining the presence of a speech signal
DE69328356T2 (en) 1993-04-29 2000-10-19 Ibm Beep detection method and apparatus for recognizing at least one sound in a dual tone multifrequency signal
US5513649A (en) * 1994-03-22 1996-05-07 Sam Technology, Inc. Adaptive interference canceler for EEG movement and eye artifacts
US5774846A (en) * 1994-12-19 1998-06-30 Matsushita Electric Industrial Co., Ltd. Speech coding apparatus, linear prediction coefficient analyzing apparatus and noise reducing apparatus
US6157712A (en) * 1998-02-03 2000-12-05 Telefonaktiebolaget Lm Ericsson Speech immunity enhancement in linear prediction based DTMF detector

Also Published As

Publication number Publication date
US6694010B1 (en) 2004-02-17
CA2270103C (en) 2007-10-23

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