ZA745028B - Circuit arrangement for a selective signal receiver particularly for use in telephone systems - Google Patents

Circuit arrangement for a selective signal receiver particularly for use in telephone systems

Info

Publication number
ZA745028B
ZA745028B ZA00745028A ZA745028A ZA745028B ZA 745028 B ZA745028 B ZA 745028B ZA 00745028 A ZA00745028 A ZA 00745028A ZA 745028 A ZA745028 A ZA 745028A ZA 745028 B ZA745028 B ZA 745028B
Authority
ZA
South Africa
Prior art keywords
circuit arrangement
signal receiver
telephone systems
selective signal
receiver particularly
Prior art date
Application number
ZA00745028A
Other languages
English (en)
Inventor
W Ohl
H Ball
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
Priority claimed from DE19732341223 external-priority patent/DE2341223C3/de
Application filed by Int Standard Electric Corp filed Critical Int Standard Electric Corp
Publication of ZA745028B publication Critical patent/ZA745028B/xx

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)
  • Measuring Frequencies, Analyzing Spectra (AREA)
  • Meter Arrangements (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
ZA00745028A 1973-08-16 1974-08-07 Circuit arrangement for a selective signal receiver particularly for use in telephone systems ZA745028B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732341223 DE2341223C3 (de) 1973-08-16 Schaltungsanordnung für einen selektiven Zeichenempfänger, insbesondere für Fernsprechanlagen

Publications (1)

Publication Number Publication Date
ZA745028B true ZA745028B (en) 1975-08-27

Family

ID=5889791

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA00745028A ZA745028B (en) 1973-08-16 1974-08-07 Circuit arrangement for a selective signal receiver particularly for use in telephone systems

Country Status (6)

Country Link
US (1) US3971897A (de)
BE (1) BE818727R (de)
FR (1) FR2241175B2 (de)
GB (1) GB1460994A (de)
HK (1) HK42377A (de)
ZA (1) ZA745028B (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4214511A (en) * 1979-06-04 1980-07-29 Mueller Gary E Break-away vent for grain storage bins
US4496800A (en) * 1983-06-22 1985-01-29 Gte Automatic Electric Inc. Ringing generator testing arrangement for a digital telephone network
US4675898A (en) * 1984-12-07 1987-06-23 Buscom Systems, Inc. Single tone telephone receiver
US20060222106A1 (en) * 2005-04-04 2006-10-05 Seidman James L Method for detecting single frequency tones

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3559080A (en) * 1967-09-12 1971-01-26 Kaijo Denki Kk Signal receiving system
US3537001A (en) * 1968-12-05 1970-10-27 Bell Telephone Labor Inc Multifrequency tone detector
US3790720A (en) * 1972-10-27 1974-02-05 Northern Electric Co Digital decoder for multiple frequency telephone signalling

Also Published As

Publication number Publication date
BE818727R (fr) 1975-02-12
US3971897A (en) 1976-07-27
GB1460994A (en) 1977-01-06
HK42377A (en) 1977-08-26
FR2241175B2 (de) 1978-03-24
AU7238874A (en) 1976-02-19
DE2341223A1 (de) 1975-02-27
DE2341223B2 (de) 1976-10-28
FR2241175A2 (de) 1975-03-14

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