IT1119943B - Ricevitore di segnali mutlifrequenza di tastiera codificati in pcm - Google Patents

Ricevitore di segnali mutlifrequenza di tastiera codificati in pcm

Info

Publication number
IT1119943B
IT1119943B IT69149/79A IT6914979A IT1119943B IT 1119943 B IT1119943 B IT 1119943B IT 69149/79 A IT69149/79 A IT 69149/79A IT 6914979 A IT6914979 A IT 6914979A IT 1119943 B IT1119943 B IT 1119943B
Authority
IT
Italy
Prior art keywords
mutlifrequency
pcm
receiver
signals coded
keyboard signals
Prior art date
Application number
IT69149/79A
Other languages
English (en)
Other versions
IT7969149A0 (it
Inventor
Guglielmo Girardi Fra Miroglio
Original Assignee
Cselt Centro Studi Lab Telecom
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 Cselt Centro Studi Lab Telecom filed Critical Cselt Centro Studi Lab Telecom
Priority to IT69149/79A priority Critical patent/IT1119943B/it
Publication of IT7969149A0 publication Critical patent/IT7969149A0/it
Priority to EP80106678A priority patent/EP0028404B1/en
Priority to DE8080106678T priority patent/DE3065390D1/de
Priority to US06/203,459 priority patent/US4379347A/en
Priority to CA000363885A priority patent/CA1157134A/en
Priority to JP55153983A priority patent/JPS592234B2/ja
Application granted granted Critical
Publication of IT1119943B publication Critical patent/IT1119943B/it

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)
  • Synchronisation In Digital Transmission Systems (AREA)
IT69149/79A 1979-11-05 1979-11-05 Ricevitore di segnali mutlifrequenza di tastiera codificati in pcm IT1119943B (it)

Priority Applications (6)

Application Number Priority Date Filing Date Title
IT69149/79A IT1119943B (it) 1979-11-05 1979-11-05 Ricevitore di segnali mutlifrequenza di tastiera codificati in pcm
EP80106678A EP0028404B1 (en) 1979-11-05 1980-10-31 Receiver for push-button pcm-encoded multifrequency signals
DE8080106678T DE3065390D1 (en) 1979-11-05 1980-10-31 Receiver for push-button pcm-encoded multifrequency signals
US06/203,459 US4379347A (en) 1979-11-05 1980-11-03 Receiver for PCM-encoded multifrequency dialing signals
CA000363885A CA1157134A (en) 1979-11-05 1980-11-03 Receiver for push-button pcm encoded multifrequency signals
JP55153983A JPS592234B2 (ja) 1979-11-05 1980-11-04 押ボタンｐｃｍ符号化多周波信号用受信機

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT69149/79A IT1119943B (it) 1979-11-05 1979-11-05 Ricevitore di segnali mutlifrequenza di tastiera codificati in pcm

Publications (2)

Publication Number Publication Date
IT7969149A0 IT7969149A0 (it) 1979-11-05
IT1119943B true IT1119943B (it) 1986-03-19

Family

ID=11311445

Family Applications (1)

Application Number Title Priority Date Filing Date
IT69149/79A IT1119943B (it) 1979-11-05 1979-11-05 Ricevitore di segnali mutlifrequenza di tastiera codificati in pcm

Country Status (6)

Country Link
US (1) US4379347A (it)
EP (1) EP0028404B1 (it)
JP (1) JPS592234B2 (it)
CA (1) CA1157134A (it)
DE (1) DE3065390D1 (it)
IT (1) IT1119943B (it)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6046899B2 (ja) * 1980-09-26 1985-10-18 日本電気株式会社 反響消去装置
CA1177588A (en) * 1982-02-12 1984-11-06 Ernst A. Munter Digital circuit and method for the detection of call progress tones in telephone systems
DE3223345A1 (de) * 1982-06-23 1984-01-05 Philips Patentverwaltung Gmbh, 2000 Hamburg Verfahren und anordnung zum demodulieren eines frequenzmodulierten eingangssignals
US4528664A (en) * 1982-11-29 1985-07-09 Northern Telecom Limited Call progress signal monitor and method for telephone systems
US4689760A (en) * 1984-11-09 1987-08-25 Digital Sound Corporation Digital tone decoder and method of decoding tones using linear prediction coding
NL8600889A (nl) * 1986-04-09 1987-11-02 Philips Nv Inrichting voor het terugwinnen van kanaalklokinformatie bij synchrone informatietransmissie en een inrichting voor het terugwinnen van de informatie voorzien van een dergelijke inrichting.
US5442696A (en) * 1991-12-31 1995-08-15 At&T Corp. Method and apparatus for detecting control signals
US6429986B1 (en) 1995-09-07 2002-08-06 International Business Machines Corporation Data storage to enhance timing recovery in high density magnetic recording
KR100276814B1 (ko) * 1998-12-31 2001-01-15 윤종용 이동통신시스템에서 구성복호기의 상태값 정규화 장치 및방법
KR100326157B1 (ko) 1998-12-31 2002-07-03 윤종용 통신시스템에서반복디코더에대한양자화방법
US20020049551A1 (en) 2000-10-20 2002-04-25 Ethicon Endo-Surgery, Inc. Method for differentiating between burdened and cracked ultrasonically tuned blades
TW579498B (en) * 2001-12-19 2004-03-11 Via Tech Inc Method for data recovery with lower sampling frequency and related apparatus
US6812389B2 (en) 2003-02-19 2004-11-02 Aaron Rhett Trooien Locking device for a tremolo

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7511707A (nl) * 1975-10-06 1977-04-12 Philips Nv Kruiscorrelatie-inrichting.
US4080516A (en) * 1975-10-06 1978-03-21 Hitachi, Ltd. Multi-frequency signal receiver
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
FR2377729A1 (fr) * 1977-01-14 1978-08-11 Thomson Csf Dispositif de decodage de signaux numeriques, et systeme comportant un tel dispositif

Also Published As

Publication number Publication date
DE3065390D1 (en) 1983-11-24
EP0028404A1 (en) 1981-05-13
JPS5675793A (en) 1981-06-23
CA1157134A (en) 1983-11-15
JPS592234B2 (ja) 1984-01-17
IT7969149A0 (it) 1979-11-05
US4379347A (en) 1983-04-05
EP0028404B1 (en) 1983-10-19

Similar Documents

Publication Publication Date Title
IT1100245B (it) Ricevitore di segnali numerici multifrequenze codificati
BR8101839A (pt) Conjunto de silencioso
ATA523181A (de) Schluessel
JPS5530294A (en) Voice signal transmitting compander
BR8005278A (pt) Hidrociclone
DE3576596D1 (de) Normalisierung von sprachsignalen.
IT1119943B (it) Ricevitore di segnali mutlifrequenza di tastiera codificati in pcm
FR2571635B1 (fr) Emetteur acoustique
JPS52135553A (en) Clarification of water
GB2059123B (en) Pcm signal calculator
DK491680A (da) Lyddaempende maatte
ZA794425B (en) Signal bladder
AR216659A1 (es) Receptor numerico de senales en codigo multifrecuencia
DK246880A (da) Duplekssender-modtager
IT1140818B (it) Generatore di segnali di chiamata
FI813527L (fi) Foerbaettrade makrolidantibiotika
AT371880B (de) Flachschluessel
JPS5727915A (en) Synthesis of polysilane
ES506267A0 (es) Perfeccionamientos en aparatos de electrorevestimento.
BR8100161A (pt) Composicao copolimerica de imidas de eteres e imidas de amidas
JPS545321A (en) Pcm coded signal frequency detector
FI804012L (fi) Krutdriven bultslaganordning
DK250482A (da) Tvangstyret lydfrembringer
IT1194776B (it) Tastiera
IT1137228B (it) Preparazione fermentativa di l-isoleucina