EP0025537A1 - Générateur de signal d'avertissement pour l'alimentation d'un haut-parleur à chambre de compression - Google Patents

Générateur de signal d'avertissement pour l'alimentation d'un haut-parleur à chambre de compression Download PDF

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Publication number
EP0025537A1
EP0025537A1 EP80105148A EP80105148A EP0025537A1 EP 0025537 A1 EP0025537 A1 EP 0025537A1 EP 80105148 A EP80105148 A EP 80105148A EP 80105148 A EP80105148 A EP 80105148A EP 0025537 A1 EP0025537 A1 EP 0025537A1
Authority
EP
European Patent Office
Prior art keywords
warning signal
signal
square wave
frequency
signal generator
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.)
Granted
Application number
EP80105148A
Other languages
German (de)
English (en)
Other versions
EP0025537B1 (fr
Inventor
Wolfgang Esser
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.)
Wandel and Golterman GmbH and Co
Original Assignee
Wandel and Golterman GmbH and Co
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 Wandel and Golterman GmbH and Co filed Critical Wandel and Golterman GmbH and Co
Priority to AT80105148T priority Critical patent/ATE8081T1/de
Publication of EP0025537A1 publication Critical patent/EP0025537A1/fr
Application granted granted Critical
Publication of EP0025537B1 publication Critical patent/EP0025537B1/fr
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K15/00—Acoustics not otherwise provided for
    • G10K15/02—Synthesis of acoustic waves
    • 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

Definitions

  • the invention relates to a warning signal generator for feeding a pressure chamber loudspeaker, the transmission range of which lies above a predetermined fundamental wave of a warning signal to be emitted by the pressure chamber loudspeaker.
  • Pressure chamber loudspeakers are often used to emit warning signals.
  • the horn size of a pressure chamber loudspeaker can be built into or attached to vehicles or the like. be limited.
  • Such pressure chamber speakers are used for example for ambulances and police cars.
  • the basic frequencies of warning signals are standardized and lie in the frequency range from 360 Hz - 630 Hz. Since these basic frequencies lie outside the transmission range of the pressure chamber loudspeakers used, they can only be emitted with significantly reduced efficiency. A high volume can be emitted of these fundamental frequencies can only be achieved with a high amplifier output.
  • the invention has for its object to provide a warning signal generator, the efficient emission of a warning signal by means of a pressure chamber speaker of relatively small size with a high lower cutoff frequency. enables.
  • the solution to this problem is obtained with a warning signal generator of the type mentioned at the outset in that the warning signal contains a large proportion of harmonics which fall within the transmission range of the pressure chamber loudspeaker. If, for example, essentially the 2nd, 3rd and 4th harmonic of a warning signal is emitted, the subjective impression is that a warning signal with the frequency of the fundamental wave is fed to the human ear. The basic frequency is nevertheless heard by the human ear .
  • the amplifier power can in particular be kept low if, on the one hand, the harmonics to be transmitted by the pressure chamber loudspeaker are in its transmission range, and on the other hand if these harmonics are at the same time in the range of the maximum sensitivity of the human ear.
  • the warning signal generator shown in FIG. 1 consists of a square wave generator 1, a first divider 2 connected downstream of it, a second divider 3 connected downstream of the first divider 2, a changeover switch 4 and a signal amplifier 5.
  • the signal amplifier 5 feeds a pressure chamber loudspeaker 6 which is connected to the output A of the warning signal generator is connected.
  • the square wave generator 1 generates a first square wave signal 4f with four times the frequency of the fundamental wave of the warning signal to be emitted.
  • the rectangular generator 1 is connected to the input of the divider 2 and to a first changeover contact u of the changeover switch 4.
  • the divider 2 divides the square-wave signal 4f supplied by the square-wave generator 1 in a ratio of 2: 1, so that a second square-wave signal 2f occurs at its output with twice the frequency of the fundamental wave.
  • the divider 2 is in turn connected on the output side to a second divider 3 and a second changeover contact v of the changeover switch 4.
  • a control signal f now occurs, which has the frequency of the fundamental wave.
  • the control signal f is supplied to the control input s of the changeover switch 4, so that the changeover switch 4 switches over with the frequency of the fundamental wave between its first changeover contact u and its second changeover contact v.
  • the first square-wave signal 4f and the second square-wave signal 2f pass alternately to the input of the signal amplifier 5 via the changeover switch 4 in time with the fundamental frequency.
  • Fig. 2a shows the first square wave signal 4f, which occurs at the output of the square wave generator 1;
  • Fig. 2b shows the second square wave signal 2f, which occurs at the output of the divider 2;
  • 2c shows the control signal f which occurs at the output of the divider 3;
  • 2d shows the signal fed to the input of the signal amplifier 5, which occurs at the output A as a warning signal.
  • the rectangular shape of the warning signal results in harmonics which lie in the transmission range of the pressure chamber loudspeaker.
  • the warning signal is fed to the signal amplifier 5 as an alternating signal, i.e. as a signal which alternately has a positive and a negative voltage. Energy can thus be emitted to the signal amplifier 5 during the entire period, wherein DC magnetization in the output transformer 7 is avoided.
  • Switching between the first square wave signal 4f and the second square wave signal 2f with the frequency of the fundamental wave results in a signal which, broken down into its spectral components, contains a large percentage of the 2nd, 3rd and 4th harmonic waves and a small percentage of the fundamental wave.
  • the 2nd, 3rd and 4th harmonic are in the transmission range of the loudspeaker when the fundamental frequency is in the range of 300 Hz to 800 Hz.
  • the current to be switched in the output stage transistors and the output transformer can be kept small.
  • Transistors are not shown in detail, but two amplifiers 8 and 9 are shown, which form a push-pull output stage in connection with the output transformer 7.
  • the rectangular generator is designed such that the frequency generated by it can be switched between two values 4f 1 and 4f 2 , for which purpose a periodic control device 10 is used.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • General Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Acoustics & Sound (AREA)
  • General Physics & Mathematics (AREA)
  • Emergency Alarm Devices (AREA)
  • Alarm Systems (AREA)
  • Optical Radar Systems And Details Thereof (AREA)
  • Eye Examination Apparatus (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Burglar Alarm Systems (AREA)
EP80105148A 1979-09-13 1980-08-29 Générateur de signal d'avertissement pour l'alimentation d'un haut-parleur à chambre de compression Expired EP0025537B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80105148T ATE8081T1 (de) 1979-09-13 1980-08-29 Warnsignalgenerator zur speisung eines druckkammerlautsprechers.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2936981A DE2936981C2 (de) 1979-09-13 1979-09-13 Warnsignalgenerator mit einem hohen Anteil an Oberwellen zur Speisung eines Druckkammerlautsprechers
DE2936981 1979-09-13

Publications (2)

Publication Number Publication Date
EP0025537A1 true EP0025537A1 (fr) 1981-03-25
EP0025537B1 EP0025537B1 (fr) 1984-06-20

Family

ID=6080745

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80105148A Expired EP0025537B1 (fr) 1979-09-13 1980-08-29 Générateur de signal d'avertissement pour l'alimentation d'un haut-parleur à chambre de compression

Country Status (6)

Country Link
EP (1) EP0025537B1 (fr)
AT (1) ATE8081T1 (fr)
DE (1) DE2936981C2 (fr)
DK (1) DK149671B (fr)
FI (1) FI802589A (fr)
NO (1) NO149367C (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2132401A (en) * 1982-12-20 1984-07-04 Emhart Ind Multiple tone signalling device
FR2616946A1 (fr) * 1987-06-19 1988-12-23 Hella Kg Hueck & Co Transmetteur de signaux acoustiques, notamment pour vehicules automobiles
WO1994025956A1 (fr) * 1993-04-30 1994-11-10 Federal Signal Corporation Circuit generateur de tonalite
WO2012034669A3 (fr) * 2010-09-18 2012-10-26 Volkswagen Aktiengesellschaft Véhicule avec entraînement électrique
WO2015112608A3 (fr) * 2014-01-23 2015-10-22 Federal Signal Corporation Production de son

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202021104667U1 (de) * 2021-08-30 2021-09-27 Haberl Electronic Gmbh & Co. Kg Sondersignalanlage

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2071291A5 (fr) * 1969-12-23 1971-09-17 Couget Jacques
DE2104954A1 (de) * 1971-02-03 1972-09-14 Westfaelische Metall Industrie Akustischer Signalgeber fur Kraft fahrzeuge
US3810169A (en) * 1969-12-15 1974-05-07 P Locke Electronic siren system
FR2309006A1 (fr) * 1975-04-26 1976-11-19 Wandel & Goltermann Installation electronique mobile, fournissant un signal d'alarme electro-acoustique du type sirene de police
FR2333314A1 (fr) * 1975-11-27 1977-06-24 Klaxon Sa Procede et dispositif d'alimentation d'un haut-parleur de signalisation acoustique

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3514622A (en) * 1968-04-29 1970-05-26 Caterpillar Tractor Co Actuator circuit for a vehicle horn

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3810169A (en) * 1969-12-15 1974-05-07 P Locke Electronic siren system
FR2071291A5 (fr) * 1969-12-23 1971-09-17 Couget Jacques
DE2104954A1 (de) * 1971-02-03 1972-09-14 Westfaelische Metall Industrie Akustischer Signalgeber fur Kraft fahrzeuge
FR2309006A1 (fr) * 1975-04-26 1976-11-19 Wandel & Goltermann Installation electronique mobile, fournissant un signal d'alarme electro-acoustique du type sirene de police
FR2333314A1 (fr) * 1975-11-27 1977-06-24 Klaxon Sa Procede et dispositif d'alimentation d'un haut-parleur de signalisation acoustique

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2132401A (en) * 1982-12-20 1984-07-04 Emhart Ind Multiple tone signalling device
FR2616946A1 (fr) * 1987-06-19 1988-12-23 Hella Kg Hueck & Co Transmetteur de signaux acoustiques, notamment pour vehicules automobiles
WO1994025956A1 (fr) * 1993-04-30 1994-11-10 Federal Signal Corporation Circuit generateur de tonalite
US5754095A (en) * 1993-04-30 1998-05-19 Federal Signal Corporation Tone generating circuit
WO2012034669A3 (fr) * 2010-09-18 2012-10-26 Volkswagen Aktiengesellschaft Véhicule avec entraînement électrique
US9050925B2 (en) 2010-09-18 2015-06-09 Volkswagen Ag Vehicle having an electric drive
WO2015112608A3 (fr) * 2014-01-23 2015-10-22 Federal Signal Corporation Production de son
US9900705B2 (en) 2014-01-23 2018-02-20 Federal Signal Corporation Tone generation

Also Published As

Publication number Publication date
DK388480A (da) 1981-03-14
ATE8081T1 (de) 1984-07-15
DE2936981A1 (de) 1981-03-19
FI802589A (fi) 1981-03-14
NO149367B (no) 1983-12-27
EP0025537B1 (fr) 1984-06-20
DK149671B (da) 1986-09-01
NO802696L (no) 1981-03-16
DE2936981C2 (de) 1985-08-22
NO149367C (no) 1984-04-04

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