IE42621B1 - Digital multifrequency signals receiver - Google Patents

Digital multifrequency signals receiver

Info

Publication number
IE42621B1
IE42621B1 IE2720/75A IE272075A IE42621B1 IE 42621 B1 IE42621 B1 IE 42621B1 IE 2720/75 A IE2720/75 A IE 2720/75A IE 272075 A IE272075 A IE 272075A IE 42621 B1 IE42621 B1 IE 42621B1
Authority
IE
Ireland
Prior art keywords
signal
value
signals
digital
threshold
Prior art date
Application number
IE2720/75A
Other languages
English (en)
Other versions
IE42621L (en
Original Assignee
Int Standard Electric 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 Int Standard Electric Corp filed Critical Int Standard Electric Corp
Publication of IE42621L publication Critical patent/IE42621L/xx
Publication of IE42621B1 publication Critical patent/IE42621B1/en

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
IE2720/75A 1974-12-18 1975-12-12 Digital multifrequency signals receiver IE42621B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7441711A FR2295665A1 (fr) 1974-12-18 1974-12-18 Recepteur numerique de signaux multifrequences

Publications (2)

Publication Number Publication Date
IE42621L IE42621L (en) 1976-06-18
IE42621B1 true IE42621B1 (en) 1980-09-10

Family

ID=9146325

Family Applications (1)

Application Number Title Priority Date Filing Date
IE2720/75A IE42621B1 (en) 1974-12-18 1975-12-12 Digital multifrequency signals receiver

Country Status (5)

Country Link
DE (1) DE2556354C2 (is)
FR (1) FR2295665A1 (is)
GB (1) GB1492310A (is)
IE (1) IE42621B1 (is)
ZA (1) ZA757642B (is)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2373926A1 (fr) * 1976-12-10 1978-07-07 Constr Telephoniques Recepteur de signaux multifrequences
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
FR2440126A1 (fr) * 1978-10-27 1980-05-23 Materiel Telephonique Dispositif et procede de reconnaissance pour recepteur numerique de signaux multifrequences
NL7903346A (nl) * 1979-04-27 1980-10-29 Bell Telephone Mfg Digitaal signaleringsstelsel.
CA1137565A (en) * 1979-05-22 1982-12-14 Masaharu Kawaguchi Digital multi-frequency receiver
US4460808A (en) * 1982-08-23 1984-07-17 At&T Bell Laboratories Adaptive signal receiving method and apparatus
DD266253A3 (de) * 1987-06-22 1989-03-29 Leipzig Rft Nachrichtenelekt Universeller digitaler mfc-empfaenger
DE3743755C2 (de) * 1987-12-23 1996-09-05 Sel Alcatel Ag Verfahren und Einrichtung zur sicheren Übertragung von Blockinformation zwischen Spurplanstellwerken
US4833399A (en) * 1988-06-13 1989-05-23 Texas Instruments Incorporated DTMF receiver

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1603175A (is) * 1968-07-30 1971-03-22
US3706076A (en) * 1970-12-21 1972-12-12 Bell Telephone Labor Inc Programmable digital filter apparatus

Also Published As

Publication number Publication date
ZA757642B (en) 1976-11-24
IE42621L (en) 1976-06-18
DE2556354C2 (de) 1984-03-08
FR2295665B1 (is) 1978-07-13
GB1492310A (en) 1977-11-16
DE2556354A1 (de) 1976-06-24
FR2295665A1 (fr) 1976-07-16

Similar Documents

Publication Publication Date Title
US4354248A (en) Programmable multifrequency tone receiver
JPS59100643A (ja) 電話チャンネルのノイズレベル判定装置
IE42621B1 (en) Digital multifrequency signals receiver
EP0108117B1 (en) Dual tone multifrequency and dial pulse receiver
US3801747A (en) Speech detector for pcm-tasi system
US4484291A (en) Comparison circuit for determining the statistical equality of two analog signals
US3949177A (en) Method for frequency-recognition in selective signal receivers for use in telecommunication, particularly telephone systems
US4742534A (en) Telephone receiving equipment for recognizing predetermined combinations of voice-frequency signalling components
EP0116555B1 (en) Adaptive signal receiving method and apparatus
US5719932A (en) Signal-recognition arrangement using cadence tables
US4206323A (en) Dual tone multifrequency signal receiver
US4479229A (en) Arrangement for and method of detecting multi-frequency sound code signals
US5304990A (en) Modular analyzer of digital signal traffic
EP0554781B1 (en) A signal transient improvement circuit
US5850438A (en) Transmission system with improved tone detection
US4045620A (en) Digital tone detector
CA1120622A (en) Single frequency tone receiver
US3223783A (en) Time-division multiplex voice-frequency discriminator
US4617427A (en) Square root circuit
US4517683A (en) Microprocessor controlled system for decoding serial data into parallel data for execution
US3958086A (en) Telephone-signal receiver for switching exchanges having centralized logic circuits
KR880000162B1 (ko) 프로그램 가능한 다주파톤 수신기
SU794767A1 (ru) Устройство дл демодул циидВОичНыХ СигНАлОВ
AU537436B2 (en) Programmable multifrequency tone receiver
SU1084854A1 (ru) Устройство дл приема и обработки шумоподобных сигналов