HK1002413A1 - Radio pager tone alarm circuit for generating variable duty constant audio frequency pulses modulated with unique tone pattern - Google Patents

Radio pager tone alarm circuit for generating variable duty constant audio frequency pulses modulated with unique tone pattern

Info

Publication number
HK1002413A1
HK1002413A1 HK98101363A HK98101363A HK1002413A1 HK 1002413 A1 HK1002413 A1 HK 1002413A1 HK 98101363 A HK98101363 A HK 98101363A HK 98101363 A HK98101363 A HK 98101363A HK 1002413 A1 HK1002413 A1 HK 1002413A1
Authority
HK
Hong Kong
Prior art keywords
tone
audio frequency
alarm circuit
frequency pulses
variable duty
Prior art date
Application number
HK98101363A
Inventor
Kazuyuki Tsunoda
Original Assignee
Nec 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
Application filed by Nec Corp filed Critical Nec Corp
Publication of HK1002413A1 publication Critical patent/HK1002413A1/en

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00—Audible signalling systems; Audible personal calling systems
    • G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
    • G08B3/1008—Personal calling arrangements or devices, i.e. paging systems
    • G08B3/1016—Personal calling arrangements or devices, i.e. paging systems using wireless transmission
    • G08B3/1025—Paging receivers with audible signalling details

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Mobile Radio Communication Systems (AREA)
HK98101363A 1990-12-29 1998-02-23 Radio pager tone alarm circuit for generating variable duty constant audio frequency pulses modulated with unique tone pattern HK1002413A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2418502A JPH04227134A (en) 1990-12-29 1990-12-29 Selective radio call receiver

Publications (1)

Publication Number Publication Date
HK1002413A1 true HK1002413A1 (en) 1998-08-21

Family

ID=18526335

Family Applications (1)

Application Number Title Priority Date Filing Date
HK98101363A HK1002413A1 (en) 1990-12-29 1998-02-23 Radio pager tone alarm circuit for generating variable duty constant audio frequency pulses modulated with unique tone pattern

Country Status (6)

Country Link
EP (1) EP0493973B1 (en)
JP (1) JPH04227134A (en)
AU (1) AU649505B2 (en)
CA (1) CA2058536A1 (en)
DE (1) DE69124974T2 (en)
HK (1) HK1002413A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09186744A (en) * 1995-12-29 1997-07-15 Nec Corp Radio communication equipment
KR0173402B1 (en) * 1996-05-18 1999-04-01 김광호 Ring volume control method of telephone
US6433673B1 (en) 1998-09-25 2002-08-13 Conexant Systems, Inc. Digital enunciator, process and communication system employing same

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2287732A1 (en) * 1974-10-09 1976-05-07 Daumas Sa Ets Selective sound alarm system - two low frequency sources to produce sound using binary memory
US4237448A (en) * 1979-04-30 1980-12-02 Motorola, Inc. Pager with escalating audio alert signal level
JPH0754990B2 (en) * 1986-09-16 1995-06-07 日本電気株式会社 Multi-report device for wireless selective call receiver
AU6718190A (en) * 1989-11-06 1991-05-31 Motorola, Inc. Selective call receiver

Also Published As

Publication number Publication date
JPH04227134A (en) 1992-08-17
AU649505B2 (en) 1994-05-26
AU9010291A (en) 1992-07-02
EP0493973A1 (en) 1992-07-08
CA2058536A1 (en) 1992-06-30
DE69124974D1 (en) 1997-04-10
EP0493973B1 (en) 1997-03-05
DE69124974T2 (en) 1997-06-12

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Legal Events

Date Code Title Description
PF Patent in force
PC Patent ceased (i.e. patent has lapsed due to the failure to pay the renewal fee)

Effective date: 20041227