DE69923203D1 - SOUND SYSTEM - Google Patents

SOUND SYSTEM

Info

Publication number
DE69923203D1
DE69923203D1 DE69923203T DE69923203T DE69923203D1 DE 69923203 D1 DE69923203 D1 DE 69923203D1 DE 69923203 T DE69923203 T DE 69923203T DE 69923203 T DE69923203 T DE 69923203T DE 69923203 D1 DE69923203 D1 DE 69923203D1
Authority
DE
Germany
Prior art keywords
sounders
pulse
played
control unit
messages
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 - Lifetime
Application number
DE69923203T
Other languages
German (de)
Other versions
DE69923203T2 (en
Inventor
Adrian Heddle
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.)
Vimpex Ltd
Original Assignee
Vimpex 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 Vimpex Ltd filed Critical Vimpex Ltd
Publication of DE69923203D1 publication Critical patent/DE69923203D1/en
Application granted granted Critical
Publication of DE69923203T2 publication Critical patent/DE69923203T2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R27/00Public address systems

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Fire Alarms (AREA)
  • Alarm Systems (AREA)
  • Investigating Or Analysing Biological Materials (AREA)
  • Prepayment Telephone Systems (AREA)
  • Meter Arrangements (AREA)
  • Massaging Devices (AREA)

Abstract

A public address apparatus comprises a number of sounders each provided with storage means in order to store a number of pre-recorded messages. A central control unit is also provided arranged to send control signals to each of the sounders, the control signals comprising an initial synchronisation and calibration pulse, followed by a second pulse of variable duration. The duration of the second pulse is used to indicate which of the pre-recorded messages to be played in response to at least one detector which provides an input to the central control unit. The arrangement has the advantage that synchronisation of the messages played by each of the sounders can be ensured.
DE69923203T 1998-09-22 1999-09-21 SOUND SYSTEM Expired - Lifetime DE69923203T2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9820644 1998-09-22
GBGB9820644.4A GB9820644D0 (en) 1998-09-22 1998-09-22 Public address apparatus
PCT/GB1999/003141 WO2000018188A2 (en) 1998-09-22 1999-09-21 Public address apparatus

Publications (2)

Publication Number Publication Date
DE69923203D1 true DE69923203D1 (en) 2005-02-17
DE69923203T2 DE69923203T2 (en) 2005-12-29

Family

ID=10839280

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69923203T Expired - Lifetime DE69923203T2 (en) 1998-09-22 1999-09-21 SOUND SYSTEM

Country Status (7)

Country Link
EP (1) EP1123637B1 (en)
JP (1) JP2002526007A (en)
AT (1) ATE287193T1 (en)
AU (1) AU6211299A (en)
DE (1) DE69923203T2 (en)
GB (1) GB9820644D0 (en)
WO (1) WO2000018188A2 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3858195A (en) * 1973-08-28 1974-12-31 Jab Co Inc Audio alarm system
DE2533330C3 (en) * 1975-07-25 1981-08-13 Siemens AG, 1000 Berlin und 8000 München Method and device for the transmission of measured values in a fire alarm system
ATE30646T1 (en) * 1983-10-17 1987-11-15 Cerberus Ag METHOD OF ALARM SIGNALING AND EQUIPMENT FOR APPLYING THE SAME.
US5887067A (en) * 1996-05-10 1999-03-23 General Signal Corporation Audio communication system for a life safety network

Also Published As

Publication number Publication date
EP1123637B1 (en) 2005-01-12
WO2000018188A2 (en) 2000-03-30
EP1123637A2 (en) 2001-08-16
WO2000018188A3 (en) 2000-06-08
ATE287193T1 (en) 2005-01-15
GB9820644D0 (en) 1998-11-18
JP2002526007A (en) 2002-08-13
DE69923203T2 (en) 2005-12-29
AU6211299A (en) 2000-04-10

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition