GB1439035A - Method and apparatus for detecting the presence of signal - components of pre-determined frequency in a multi-frequency signal - Google Patents

Method and apparatus for detecting the presence of signal - components of pre-determined frequency in a multi-frequency signal

Info

Publication number
GB1439035A
GB1439035A GB3810673A GB3810673A GB1439035A GB 1439035 A GB1439035 A GB 1439035A GB 3810673 A GB3810673 A GB 3810673A GB 3810673 A GB3810673 A GB 3810673A GB 1439035 A GB1439035 A GB 1439035A
Authority
GB
United Kingdom
Prior art keywords
signal
frequency
samples
incoming
comparator
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.)
Expired
Application number
GB3810673A
Other languages
English (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.)
COMMW OF AUSTRIALIA
Original Assignee
COMMW OF AUSTRIALIA
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 COMMW OF AUSTRIALIA filed Critical COMMW OF AUSTRIALIA
Publication of GB1439035A publication Critical patent/GB1439035A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
    • H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals
    • H04Q1/4575—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals which are transmitted in digital form

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Measuring Frequencies, Analyzing Spectra (AREA)
GB3810673A 1972-08-10 1973-08-10 Method and apparatus for detecting the presence of signal - components of pre-determined frequency in a multi-frequency signal Expired GB1439035A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AUPB002472 1972-08-10

Publications (1)

Publication Number Publication Date
GB1439035A true GB1439035A (en) 1976-06-09

Family

ID=3765245

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3810673A Expired GB1439035A (en) 1972-08-10 1973-08-10 Method and apparatus for detecting the presence of signal - components of pre-determined frequency in a multi-frequency signal

Country Status (8)

Country Link
US (1) US3882283A (enExample)
JP (1) JPS5047509A (enExample)
BE (1) BE803494A (enExample)
CA (1) CA984068A (enExample)
DE (1) DE2340672A1 (enExample)
FR (1) FR2195797A1 (enExample)
GB (1) GB1439035A (enExample)
NL (1) NL7311093A (enExample)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5548752B2 (enExample) * 1974-05-17 1980-12-08
FR2287811A1 (fr) * 1974-10-08 1976-05-07 Cit Alcatel Regulateur de niveau de type numerique
US3959603A (en) * 1974-10-29 1976-05-25 Tone Technology Corporation Dual tone multiple frequency receiver/decoder
US3937899A (en) * 1975-01-30 1976-02-10 Bell Telephone Laboratories, Incorporated Tone detector using spectrum parameter estimation
FR2299769A1 (fr) * 1975-01-31 1976-08-27 Telecommunications Sa Procede d'application
NL7511707A (nl) * 1975-10-06 1977-04-12 Philips Nv Kruiscorrelatie-inrichting.
JPS5286706A (en) * 1976-01-14 1977-07-19 Hitachi Ltd Key telephone receiver for audio sound response
US4066878A (en) * 1976-03-29 1978-01-03 Miller Raymond M Time-domain filter for recursive type signals
IT1072242B (it) * 1976-12-17 1985-04-10 Cselt Centro Studi Lab Telecom Procedimento e dispositivo per il riconoscimento di segnali telefonici in codice multifrequenza convertiti in forma numerica
US4185172A (en) 1976-12-17 1980-01-22 Cselt - Centro Studi E Laboratori Telecomunicazioni S.P.A. Method of and means for detecting digitized multi frequency-coded signals
DE2833335A1 (de) * 1978-07-29 1980-03-06 Licentia Gmbh Digitaler frequenzdiskriminator
NL177169B (nl) * 1978-09-08 1985-03-01 Nederlanden Staat Inrichting om de aanwezigheid vast te stellen van een of meer van een aantal frequenties in pulscode-gemoduleerde signalen.
US4334273A (en) * 1979-04-24 1982-06-08 Kokusai Denshin Denwa Co., Ltd. Signal processing system using a digital technique
NL177552C (nl) * 1979-05-02 1985-10-01 Nederlanden Staat Inrichting voor het onder gebruikmaking van een digitale correlatiemethode vaststellen van de aanwezigheid van elke van een aantal vaste frequenties in een signaal.
US4352194A (en) * 1980-07-25 1982-09-28 Rca Corporation System and method for frequency discrimination
US4484035A (en) * 1980-09-29 1984-11-20 Transwave Dual tone multi frequency digital detector
DE3130208C2 (de) * 1981-07-30 1984-03-08 Siemens AG, 1000 Berlin und 8000 München Hörtonempfänger für eine Fernmeldeanlage, insbesondere Fernsprechnebenstellenanlage, mit digitaler Sprach- und Datenübertragung
KR100430513B1 (ko) * 1996-01-26 2004-10-14 코닌클리케 필립스 일렉트로닉스 엔.브이. 개량된톤검출기능을구비한송신시스템,단말,톤검출기및동시에송신된복수의톤신호들을수신하는방법
US6813529B2 (en) * 2001-01-19 2004-11-02 Microchip Technology Incorporated Method and apparatus for signal frequency decoding without an analog bandpass filter

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3412334A (en) * 1964-05-06 1968-11-19 Navy Usa Digital correlator
DE1267272B (de) * 1966-03-25 1968-05-02 Siemens Ag Frequenzselektiver Signalempfaenger
US3502989A (en) * 1966-05-03 1970-03-24 Itt Receiver employing correlation techniques
US3652805A (en) * 1969-10-10 1972-03-28 Information Control Systems In Binary frequency identification system
US3636446A (en) * 1970-03-04 1972-01-18 H B Engineering Corp Receiver for detecting signals within a predetermined bandwidth
DE2017355C3 (de) * 1970-04-11 1979-05-10 Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt Frequenzerkennungseinrichtung
US3686576A (en) * 1970-12-18 1972-08-22 Ibm Parallel tone detector

Also Published As

Publication number Publication date
DE2340672A1 (de) 1974-02-28
CA984068A (en) 1976-02-17
BE803494A (fr) 1973-12-03
NL7311093A (enExample) 1974-02-12
US3882283A (en) 1975-05-06
FR2195797A1 (enExample) 1974-03-08
JPS5047509A (enExample) 1975-04-28

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee