NL186057C - SIGNAL RECEIVER WORKING WITH SEVERAL FREQUENCIES FOR RECEIVING PRE-CERTAIN DOUBLE TONE SIGNALS. - Google Patents

SIGNAL RECEIVER WORKING WITH SEVERAL FREQUENCIES FOR RECEIVING PRE-CERTAIN DOUBLE TONE SIGNALS.

Info

Publication number
NL186057C
NL186057C NLAANVRAGE7702219,A NL7702219A NL186057C NL 186057 C NL186057 C NL 186057C NL 7702219 A NL7702219 A NL 7702219A NL 186057 C NL186057 C NL 186057C
Authority
NL
Netherlands
Prior art keywords
signal receiver
tone signals
several frequencies
receiving pre
double tone
Prior art date
Application number
NLAANVRAGE7702219,A
Other languages
Dutch (nl)
Other versions
NL7702219A (en
NL186057B (en
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 NL7702219A publication Critical patent/NL7702219A/en
Publication of NL186057B publication Critical patent/NL186057B/en
Application granted granted Critical
Publication of NL186057C publication Critical patent/NL186057C/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)
  • Stereo-Broadcasting Methods (AREA)
NLAANVRAGE7702219,A 1976-03-03 1977-03-02 SIGNAL RECEIVER WORKING WITH SEVERAL FREQUENCIES FOR RECEIVING PRE-CERTAIN DOUBLE TONE SIGNALS. NL186057C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA247,035A CA1031086A (en) 1976-03-03 1976-03-03 Method and apparatus for translating multiple frequency signalling

Publications (3)

Publication Number Publication Date
NL7702219A NL7702219A (en) 1977-09-06
NL186057B NL186057B (en) 1990-04-02
NL186057C true NL186057C (en) 1990-09-03

Family

ID=4105372

Family Applications (1)

Application Number Title Priority Date Filing Date
NLAANVRAGE7702219,A NL186057C (en) 1976-03-03 1977-03-02 SIGNAL RECEIVER WORKING WITH SEVERAL FREQUENCIES FOR RECEIVING PRE-CERTAIN DOUBLE TONE SIGNALS.

Country Status (11)

Country Link
JP (1) JPS52107708A (en)
AU (1) AU508271B2 (en)
BE (1) BE852056A (en)
CA (1) CA1031086A (en)
DE (1) DE2709370A1 (en)
DK (1) DK88877A (en)
FR (1) FR2343377A1 (en)
GB (1) GB1532103A (en)
NL (1) NL186057C (en)
NO (1) NO770696L (en)
SE (1) SE424129B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5831140B2 (en) * 1978-11-10 1983-07-04 株式会社日立製作所 signal receiver
DE3629907A1 (en) * 1986-09-03 1988-03-10 Standard Elektrik Lorenz Ag SIGNALING RECEIVER

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3710031A (en) * 1970-12-23 1973-01-09 Itt Multi frequency receiver
FR2127450A5 (en) * 1971-03-03 1972-10-13 Ibm France
DE2116635C3 (en) * 1971-04-05 1978-10-05 Ibm Deutschland Gmbh, 7000 Stuttgart Method for digital decoding of frequency-coded signals and circuit arrangement for carrying out the method
CA976675A (en) * 1972-10-16 1975-10-21 Microsystems International Limited Dual tone receiver
US3914557A (en) * 1973-04-11 1975-10-21 Bell Telephone Labor Inc Multifrequency tone detecting arrangement
US3936801A (en) * 1974-09-12 1976-02-03 Bell Telephone Laboratories, Incorporated Multifrequency signal receiver timing circuit

Also Published As

Publication number Publication date
GB1532103A (en) 1978-11-15
BE852056A (en) 1977-07-01
NL7702219A (en) 1977-09-06
CA1031086A (en) 1978-05-09
AU2244877A (en) 1978-08-24
JPS52107708A (en) 1977-09-09
FR2343377A1 (en) 1977-09-30
DE2709370A1 (en) 1977-09-08
DK88877A (en) 1977-09-04
AU508271B2 (en) 1980-03-13
SE424129B (en) 1982-06-28
NL186057B (en) 1990-04-02
FR2343377B1 (en) 1983-08-12
NO770696L (en) 1977-09-06
SE7702418L (en) 1977-09-04

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Legal Events

Date Code Title Description
BA A request for search or an international-type search has been filed
BB A search report has been drawn up
BC A request for examination has been filed
A85 Still pending on 85-01-01
V1 Lapsed because of non-payment of the annual fee