SE8001315L - SIGNAL RECEIVER - Google Patents

SIGNAL RECEIVER

Info

Publication number
SE8001315L
SE8001315L SE8001315A SE8001315A SE8001315L SE 8001315 L SE8001315 L SE 8001315L SE 8001315 A SE8001315 A SE 8001315A SE 8001315 A SE8001315 A SE 8001315A SE 8001315 L SE8001315 L SE 8001315L
Authority
SE
Sweden
Prior art keywords
filter
signals
switching facility
signalling
pcm
Prior art date
Application number
SE8001315A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE452388B (en
Inventor
S Cohn-Sfetcu
J K Hood
D J Doyle
Original Assignee
Northern Telecom Ltd
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 Northern Telecom Ltd filed Critical Northern Telecom Ltd
Publication of SE8001315L publication Critical patent/SE8001315L/en
Publication of SE452388B publication Critical patent/SE452388B/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
    • 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)
  • Time-Division Multiplex Systems (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
  • Electrophonic Musical Instruments (AREA)

Abstract

A digital signalling receiver translates pulse code modulated (PCM) tone signalling into a signal format compatible with a controller in an associated time division multiplex (TDM) telephone switching facility. In the receiver, steering signals are generated in synchronism with the operation of the switching facility to direct the operation of a time shared filter. The filter performs a plurality of filter functions with a series of PCM signals received from the TDM switching facility and generates therefrom series of filter signals relative each of the filter functions. A translator identifies two filter signals having larger amplitudes than the others and if the two signals persist substantially uninterrupted (a) through a predetermined period of time, (b) within a predetermined relative amplitude range and (c) one of the two signals having at least a predetermined signal to noise ratio relative another filter signal corresponding to an allpass filter function, the translator indicates the receipt of multifrequency signalling by generating the appropriate signals in the required signal format.
SE8001315A 1979-02-22 1980-02-19 SIGNAL RECEIVER AND SET FOR RECEIPT OF SCULD CODE MODULATED, PCM, TONE SIGNALS SE452388B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA322,112A CA1111531A (en) 1979-02-22 1979-02-22 Digital signalling receiver for receiving pcm tones

Publications (2)

Publication Number Publication Date
SE8001315L true SE8001315L (en) 1980-08-23
SE452388B SE452388B (en) 1987-11-23

Family

ID=4113607

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8001315A SE452388B (en) 1979-02-22 1980-02-19 SIGNAL RECEIVER AND SET FOR RECEIPT OF SCULD CODE MODULATED, PCM, TONE SIGNALS

Country Status (9)

Country Link
JP (1) JPS55137788A (en)
AT (1) AT386312B (en)
CA (1) CA1111531A (en)
DE (1) DE3005740A1 (en)
FR (1) FR2450017A1 (en)
GB (1) GB2044039B (en)
IT (1) IT1140634B (en)
NL (1) NL8001026A (en)
SE (1) SE452388B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5779751A (en) * 1980-11-05 1982-05-19 Nec Corp Signal receiver
FR2504754A1 (en) * 1981-04-27 1982-10-29 Thomson Csf Mat Tel Sequencer for ROMs in digital waveform generator - uses program in master ROM to control operational sequences from slave ROMs via clocked bistable multivibrator circuits
US4519072A (en) * 1982-11-10 1985-05-21 Rockwell International Corporation Answer supervision system
JPH07171782A (en) * 1991-07-16 1995-07-11 Haruo Konagai Vacuum suction device

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1603175A (en) * 1968-07-30 1971-03-22
US3863030A (en) * 1972-06-01 1975-01-28 Gte Automatic Electric Lab Inc Pcm tone receiver using digital spectrum analysis
JPS51112218A (en) * 1975-03-28 1976-10-04 Hitachi Ltd Multifrequency signal receiver
JPS5918916B2 (en) * 1975-10-06 1984-05-01 株式会社日立製作所 multifrequency signal receiver
IT1072242B (en) * 1976-12-17 1985-04-10 Cselt Centro Studi Lab Telecom PROCEDURE AND DEVICE FOR THE RECOGNITION OF TELEPHONE SIGNALS IN MULTIFREQUENCY CODE CONVERTED IN NUMERICAL FORM

Also Published As

Publication number Publication date
FR2450017A1 (en) 1980-09-19
AT386312B (en) 1988-08-10
GB2044039B (en) 1983-05-11
GB2044039A (en) 1980-10-08
SE452388B (en) 1987-11-23
CA1111531A (en) 1981-10-27
JPS55137788A (en) 1980-10-27
IT8019986A1 (en) 1981-08-18
IT8019986A0 (en) 1980-02-18
ATA96280A (en) 1987-12-15
NL8001026A (en) 1980-08-26
DE3005740A1 (en) 1980-09-04
IT1140634B (en) 1986-10-01
FR2450017B1 (en) 1984-05-11

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