ZA708418B - Improvements in or relating to tone signalling apparatus - Google Patents

Improvements in or relating to tone signalling apparatus

Info

Publication number
ZA708418B
ZA708418B ZA708418A ZA708418A ZA708418B ZA 708418 B ZA708418 B ZA 708418B ZA 708418 A ZA708418 A ZA 708418A ZA 708418 A ZA708418 A ZA 708418A ZA 708418 B ZA708418 B ZA 708418B
Authority
ZA
South Africa
Prior art keywords
relating
signalling apparatus
tone signalling
tone
signalling
Prior art date
Application number
ZA708418A
Inventor
O Hale
C Rakes
Original Assignee
Fantron 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 US887971A external-priority patent/US3649770A/en
Application filed by Fantron Corp filed Critical Fantron Corp
Publication of ZA708418B publication Critical patent/ZA708418B/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/18—Service support devices; Network management devices
    • H04W88/185—Selective call encoders for paging networks, e.g. paging centre devices
    • H04W88/188—Selective call encoders for paging networks, e.g. paging centre devices using frequency address codes
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G08C19/12—Electric signal transmission systems in which the signal transmitted is frequency or phase of ac
    • G08C19/14—Electric signal transmission systems in which the signal transmitted is frequency or phase of ac using combination of fixed frequencies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/30—Systems using multi-frequency codes wherein each code element is represented by a combination of frequencies
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Filters And Equalizers (AREA)
  • Selective Calling Equipment (AREA)
ZA708418A 1969-12-24 1970-12-14 Improvements in or relating to tone signalling apparatus ZA708418B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US887971A US3649770A (en) 1969-12-24 Tone signaling system

Publications (1)

Publication Number Publication Date
ZA708418B true ZA708418B (en) 1972-07-26

Family

ID=25392253

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA708418A ZA708418B (en) 1969-12-24 1970-12-14 Improvements in or relating to tone signalling apparatus

Country Status (8)

Country Link
BE (1) BE760766A (en)
CA (1) CA928818A (en)
DE (1) DE2062957A1 (en)
ES (1) ES386797A1 (en)
FR (1) FR2072054B1 (en)
GB (1) GB1328665A (en)
NL (1) NL7018746A (en)
ZA (1) ZA708418B (en)

Also Published As

Publication number Publication date
BE760766A (en) 1971-05-27
ES386797A1 (en) 1973-04-01
NL7018746A (en) 1971-06-28
DE2062957A1 (en) 1971-07-08
GB1328665A (en) 1973-08-30
FR2072054A1 (en) 1971-09-24
FR2072054B1 (en) 1973-02-02
CA928818A (en) 1973-06-19

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