GB1402119A - Telecommunications characteristics receivers - Google Patents

Telecommunications characteristics receivers

Info

Publication number
GB1402119A
GB1402119A GB4245972A GB4245972A GB1402119A GB 1402119 A GB1402119 A GB 1402119A GB 4245972 A GB4245972 A GB 4245972A GB 4245972 A GB4245972 A GB 4245972A GB 1402119 A GB1402119 A GB 1402119A
Authority
GB
United Kingdom
Prior art keywords
frequency
circuit
tone
count
gates
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
GB4245972A
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.)
Siemens Corp
Original Assignee
Siemens 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
Priority claimed from DE19712145886 external-priority patent/DE2145886C2/de
Priority claimed from DE19712156123 external-priority patent/DE2156123C2/de
Application filed by Siemens Corp filed Critical Siemens Corp
Publication of GB1402119A publication Critical patent/GB1402119A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Interface Circuits In Exchanges (AREA)
GB4245972A 1971-09-14 1972-09-13 Telecommunications characteristics receivers Expired GB1402119A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19712145886 DE2145886C2 (de) 1971-09-14 1971-09-14 Sprachgeschützter frequenzselektiver Zeichenempfänger für Fernmelde-, insbesondere Fernsprechanlagen
DE19712156123 DE2156123C2 (de) 1971-11-11 1971-11-11 Frequenzselektiver Zeichenempfänger für Fernmelde-, insbesondere Fernsprechanlagen

Publications (1)

Publication Number Publication Date
GB1402119A true GB1402119A (en) 1975-08-06

Family

ID=25761724

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4245972A Expired GB1402119A (en) 1971-09-14 1972-09-13 Telecommunications characteristics receivers

Country Status (9)

Country Link
AT (1) AT328516B (enrdf_load_stackoverflow)
BE (1) BE788813A (enrdf_load_stackoverflow)
CH (1) CH545569A (enrdf_load_stackoverflow)
FR (1) FR2153943A5 (enrdf_load_stackoverflow)
GB (1) GB1402119A (enrdf_load_stackoverflow)
IT (1) IT967367B (enrdf_load_stackoverflow)
LU (1) LU66057A1 (enrdf_load_stackoverflow)
NL (1) NL7212486A (enrdf_load_stackoverflow)
SE (1) SE397461B (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0008160A1 (en) * 1978-08-10 1980-02-20 Motorola, Inc. Programmable digital tone detector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0008160A1 (en) * 1978-08-10 1980-02-20 Motorola, Inc. Programmable digital tone detector

Also Published As

Publication number Publication date
NL7212486A (enrdf_load_stackoverflow) 1973-03-16
LU66057A1 (enrdf_load_stackoverflow) 1973-01-17
IT967367B (it) 1974-02-28
BE788813A (fr) 1973-03-14
SE397461B (sv) 1977-10-31
CH545569A (enrdf_load_stackoverflow) 1974-01-31
ATA713372A (de) 1975-06-15
AT328516B (de) 1976-03-25
FR2153943A5 (enrdf_load_stackoverflow) 1973-05-04

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee