EP0025537B1 - 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
EP0025537B1
EP0025537B1 EP80105148A EP80105148A EP0025537B1 EP 0025537 B1 EP0025537 B1 EP 0025537B1 EP 80105148 A EP80105148 A EP 80105148A EP 80105148 A EP80105148 A EP 80105148A EP 0025537 B1 EP0025537 B1 EP 0025537B1
Authority
EP
European Patent Office
Prior art keywords
signal
square wave
frequency
warning signal
fundamental frequency
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
Application number
EP80105148A
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German (de)
English (en)
Other versions
EP0025537A1 (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, which contains a large proportion of harmonics which fall within the transmission range of the pressure chamber loudspeaker.
  • pressure chamber loudspeakers are often used, which due to their design have certain radiation characteristics.
  • 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 only be achieved when these fundamental frequencies are emitted by a high amplifier output.
  • DE-B 2104954 discloses an acoustic signal generator for motor vehicles, in which a modulation sound signal lying in the optimum transmission range of an electromechanical sound radiation means is generated in that a fundamental oscillation of, for example, 400 Hz, which has the frequency of a desired signal, is generated by a second generator A first generator generates an overtone oscillation of, for example, 2 kHz, so that 1.6 kHz, 2 kHz and 2.4 kHz are produced and the ear perceives the difference tone signal of, for example, 400 Hz.
  • the invention has for its object to provide a warning signal generator which requires as little effort as possible and in particular does not require a modulator and which provides an output signal with the crest factor 1.
  • the warning signal is a composite square wave signal with constant amplitude, which consists of a first square wave signal with the frequency of the fourth harmonic and a second square wave signal with the frequency of the second harmonic, with between the first and the second square wave signal the frequency of the fundamental wave is switched so that at the output of the warning signal generator, the first rectangular signal and the second rectangular signal appear as a warning signal (FIG. 2d) during every first half period of the fundamental wave and alternately in time with the fundamental wave.
  • the rectangular output signal of which has the crest factor 1 essentially contains the 2nd, 3rd and 4th harmonic of a warning signal and yet subjectively gives the impression that the human ear is receiving a warning signal with the frequency the fundamental wave is fed. So the basic frequency is still heard by human hearing.
  • 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 ver on the output side with a second divider 3 and a second changeover contact v of the changeover switch 4 bound.
  • a control signal f now occurs which has the frequency of the fundamental wave.
  • the control signal f is fed 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 plate 2;
  • Fig. 2c shows the control signal f that occurs at the output of the plate 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 that 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 delivered to the signal amplifier 5 during the entire period, whereby 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 proportion of 2nd, 3rd and 4th harmonic waves and a low fundamental wave component.
  • 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 and the output transformer can be kept small.
  • the output stage 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 square-wave generator is designed such that the frequency it generates can be switched between two values 4f and 4f 2 , for which purpose a periodic control device 10 is used.

Landscapes

  • Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • General Physics & Mathematics (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • General Health & Medical Sciences (AREA)
  • Emergency Alarm Devices (AREA)
  • Alarm Systems (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Burglar Alarm Systems (AREA)
  • Eye Examination Apparatus (AREA)
  • Optical Radar Systems And Details Thereof (AREA)

Claims (4)

1. Générateur de signal d'avertissement pour l'alimentation d'un haut-parleur à chambre de compression, dont la bande passante se situe au-dessus d'une onde fondamentale prédéterminée d'un signal d'avertissement qui est destiné à être rayonné par le haut-parleur et qui contient une grande proportion d'ondes harmoniques qui tombent dans la bande passante du haut-parleur à chambre de compression, caractérisé en ce que le signal d'avertissement est un signal rectangulaire composé, d'amplitude constante, qui est formé d'un premier signal rectangulaire (4f) ayant la fréquence de la quatrième harmonique et d'un deuxième signal rectangulaire (2f) ayant la fréquence de la deuxième harmonique, une commutation étant effectuée entre le premier et le deuxième signal rectangulaires (4f, 2f) à la fréquence de l'onde fondamentale (f), de façon qu'à la sortie (A) du générateur de signal d'avertissement apparaissent, en tant que signal d'avertissement (fig. 2d), alternativement et en cadence avec l'onde fondamentale (f), le premier signal rectangulaire, pendant chaque première demi-période de l'onde fondamentale, et le deuxième signal rectangulaire, pendant chaque deuxième demi-période de l'onde fondamentale.
2. Générateur de signal d'avertissement selon la revendication 1, caractérisé en ce que le générateur de signal d'avertissement renferme un générateur d'ondes rectangulaires (1) qui engendre le premier signal rectangulaire (4f) à la fréquence de la quatrième harmonique de l'onde fondamentale (f) du signal d'avertissement, en ce que le générateur d'ondes rectangulaires (1) alimente un premier diviseur de fréquence (2), en ce que le premier diviseur de fréquence (2) alimente un deuxième diviseur de fréquence (3), en ce que les deux diviseurs de fréquence (2 et 3) possèdent le rapport de division 2 : 1, en ce que la sortie du deuxième diviseur de fréquence (3) est connectée à l'entrée de commande (s) d'un commutateur (4), en ce qu'au premier contact de commutation (u) du commutateur (4), est appliqué le premier signal rectangulaire (4f) engendré par le générateur d'ondes rectangulaires (1), tandis qu'au deuxième contact de commutation (v), est appliqué le deuxième signal rectangulaire (2f) qui apparaît à la sortie du premier diviseur de fréquence (2), et en ce qu'au moyen du signal (f) appliqué à l'entrée de commande (s) du commutateur (4), les premier et deuxième signaux rectangulaires (4f, 2f) se trouvent alternativement commutés à la sortie (A) du générateur de signal d'avertissement.
3. Générateur de signal d'avertissement selon la revendication 2, caractérisé en ce qu'entre le commutateur (4) et la sortie (A) du générateur de signal d'avertissement, est monté un amplificateur de commutation en push-pull (5).
4. Générateur de signal d'avertissement selon la revendication 1, caractérisé en ce que la fréquence du signal rectangulaire (4f) prend des valeurs périodiquement différentes.
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 EP0025537A1 (fr) 1981-03-25
EP0025537B1 true 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 (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4140602A1 (fr) * 2021-08-30 2023-03-01 Haberl Electronic GmbH & Co. KG Signalisation spéciale

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4558305A (en) * 1982-12-20 1985-12-10 Emhart Industries, Inc. Multiple tone signaling device
DE3720402A1 (de) * 1987-06-19 1988-12-29 Hella Kg Hueck & Co Akustischer signalgeber, insbesondere fuer kraftfahrzeuge
EP0648364A1 (fr) * 1993-04-30 1995-04-19 Federal Signal Corporation Circuit generateur de tonalite
DE102010045996A1 (de) 2010-09-18 2012-03-22 Volkswagen Ag Fahrzeug mit Elektroantrieb
US9900705B2 (en) 2014-01-23 2018-02-20 Federal Signal Corporation Tone generation

Family Cites Families (6)

* 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
US3810169A (en) * 1969-12-15 1974-05-07 P Locke Electronic siren system
FR2071291A5 (fr) * 1969-12-23 1971-09-17 Couget Jacques
DE2104954C3 (de) * 1971-02-03 1975-10-16 Westfaelische Metall Industrie Kg, Hueck & Co, 4780 Lippstadt Akustischer Signalgeber für Kraftfahrzeuge
DE2518708B1 (de) * 1975-04-26 1976-02-26 Wandel & Goltermann Mobile elektroakustische Alarmsignalanlage,sogenanntes elektronisches Polizeihorn
FR2333314A1 (fr) * 1975-11-27 1977-06-24 Klaxon Sa Procede et dispositif d'alimentation d'un haut-parleur de signalisation acoustique

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4140602A1 (fr) * 2021-08-30 2023-03-01 Haberl Electronic GmbH & Co. KG Signalisation spéciale

Also Published As

Publication number Publication date
ATE8081T1 (de) 1984-07-15
EP0025537A1 (fr) 1981-03-25
DK388480A (da) 1981-03-14
DE2936981C2 (de) 1985-08-22
DE2936981A1 (de) 1981-03-19
DK149671B (da) 1986-09-01
FI802589A (fi) 1981-03-14
NO802696L (no) 1981-03-16
NO149367B (no) 1983-12-27
NO149367C (no) 1984-04-04

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