EP0025537A1 - Warning signal generator for feeding a pressure chamber loudspeaker - Google Patents

Warning signal generator for feeding a pressure chamber loudspeaker Download PDF

Info

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)
French (fr)
Other versions
EP0025537B1 (en
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/en
Publication of EP0025537A1 publication Critical patent/EP0025537A1/en
Application granted granted Critical
Publication of EP0025537B1 publication Critical patent/EP0025537B1/en
Expired legal-status Critical Current

Links

Images

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.

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)

Abstract

1. Warning signal generator for supplying a signal to a compression driver projector horn whose sound propagation range lies above a preset fundamental frequency of a warning signal to be propagated by a compression driver projection horn loudspeaker, and the aforementioned warning signal contains a great many components of harmonics that occur in the sound projection range of the compression driver projection horn loudspeaker, characterized by the warning signal is a composite signal formed to be a square wave signal at constant amplitude and comprising a first square wave signal (4f) at the frequency of the fourth harmonic and a second square wave signal (2f) at the frequency of the second harmonic, whereby the fundamental frequency (f) is the changeover switching frequency used for switching between the first and second (4f, 2f) square wave signals, so that at the output (A) of the warning signal generator, the signal alternates at the same periodic rate of change of the fundamental frequency (f), and during each first half-period of the fundamental frequency, the first square wave signal appears and during each second half-period of the fundamental frequency, the second square wave signal appears, with the consequence that the warning signal appears as the composite of the two (Fig. 2d).

Description

Die Erfindung betrifft einen Warnsignalgenerator zur Speisung eines Druckkammerlautsprechers, dessen Übertragungsbereich oberhalb einer vorgegebenen Grundwelle eines vom Druckkammerlautsprecher abzustrahlenden Warnsignals liegt.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.

Zur Abstrahlung von Warnsignalen werden häufig Druckkammerlautsprecher verwendet, die durch ihre Bauform bedingt bestimmte Abstrahleigenschaften haben. So kann die Trichtergröße eines Druckkammerlautsprechers durch die Ein-oder Anbaumöglichkeit an Fahrzeugen o.ä. begrenzt sein. Solche Druckkammerlautsprecher werden beispielsweise für Krankenwagen und Polizeiwagen verwendet.Pressure chamber loudspeakers are often used to emit warning signals. For example, 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.

Die Grundfrequenzen von Warnsignalen sind genormt und liegen im Frequenzbereich von 360 Hz - 630 Hz. Da diese Grundfrequenzen außerhalb des Übertragungsbereichs der verwendeten Druckkammerlautsprecher liegen, können diese nur mit erheblich vermindertem Wirkungsgrad abgestrahlt werden. Eine hohe Lautstärke kann bei der Abstrahlung dieser Grundfrequenzen nur durch eine hohe Verstärkerleistung erreicht werden.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.

Der Erfindung liegt die Aufgabe zugrunde, einen Warnsignalgenerator zu schaffen, der eine leistungsgünstige Abstrahlung eines Warnsignals mittels eines Druckkammerlautsprechers relativ kleiner Baugröße mit hoher unterer Grenzfrequenz. ermöglicht.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.

Die Lösung dieser Aufgabe erhält man bei einem Warnsignalgenerator der eingangs genannten Gattung dadurch, daß das Warnsignal einen großen Anteil von Oberwellen enthält, die in den Übertragungsbereich des Druckkammerlautsprechers fallen. Werden beispielsweise im wesentlichen die 2. , 3. und 4. Oberwelle eines Warnsignals abgestrahlt, so entsteht dennoch subjektiv der Eindruck, daß dem menschlichen Ohr ein Warnsignal mit der Frequenz der Grundwelle zugeführt wird..Es wird also dennoch vom menschlichen Gehör die Grundfrequenz gehört. Die Verstärkerleistung kann insbesondere dann gering gehalten werden, wenn zum einen die vom Druckkammerlautsprecher zu übertragenden Oberwellen in dessen Übertragungsbereich liegen, und zum anderen wenn diese Oberwellen gleichzeitig im Bereich der maximalen Empfindlichkeit des menschlichen Ohres liegen.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.

Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen gekennzeichnet.Advantageous embodiments of the invention are characterized in the subclaims.

Die Erfindung wird nachfolgend anhand der Zeichnung näher erläutert. Es zeigen:

  • Fig. 1 das Blockschaltbild eines erfindungsgemäßen Warnsignalgenerators und
  • Fig. 2a bis Fig. 2d verschiedene im Warnsignalgenerator nach Fig. 1 auftretende Signale.
The invention is explained below with reference to the drawing. Show it:
  • Fig. 1 shows the block diagram of a warning signal generator according to the invention and
  • 2a to 2d different signals occurring in the warning signal generator according to FIG. 1.

Der in Fig. 1 dargestellte Warnsignalgenerator besteht aus einem Rechteckgenerator 1, einem ihm nachgeschalteten ersten Teiler 2, einem dem ersten Teiler 2 nachgeschalteten zweiten Teiler 3, einem Umschalter 4 und einem Signalverstärker 5. Der Signalverstärker 5 speist einen Druckkammerlautsprecher 6, der am Ausgang A des Warnsignalgenerators angeschlossen ist.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.

Der Rechteckgenerator 1 erzeugt ein erstes Rechtecksignal 4f mit der vierfachen Frequenz der Grundwelle des abzustrahlenden Warnsignals. Ausgangsseitig ist der Rechteckgenerator 1 mit dem Eingang des Teilers 2 und mit einem ersten Umschaltkontakt u des Umschalters 4 verbunden. Der Teiler 2 teilt das vom Rechteckgenerator 1 gelieferte Rechtecksignal 4f im Verhältnis 2:1, so daß an seinem Ausgang ein zweites Rechtecksignal 2f mit der doppelten Frequenz der Grundwelle auftritt. Der Teiler 2 ist nun seinerseits ausgangsseitig mit einem zweiten Teiler 3 und einem zweiten Umschaltkontakt v des Umschalters 4 verbunden. Am Ausgang des zweiten Teilers 3, der ebenfals wie der Teiler 2 das Teilerverhältnis 2:1 hat, tritt nun ein Steuersignal f auf, welches die Frequenz der Grundwelle hat. Das Steuersignal f wird dem Steuereingang s des Umschalters 4 zugeführt, so daß der Umschalter 4 mit der Frequenz der Grundwelle zwischen seinem ersten Umschaltkontakt u und seinem zweiten Umschaltkontakt v umschaltet. Über den Umschalter 4 gelangt im Takt der Grundfrequenz abwechselnd das erste Rechtecksignal 4f und das zweite Rechtecksignal 2f zum Eingang des Signalverstärkers 5.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. On the output side, 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. At the output of the second divider 3, which also has the divider ratio 2: 1 like the divider 2, 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 zeigt das erste Rechtecksignal 4f, das am Ausgang des Rechteckgenerators 1 auftritt; Fig. 2b zeigt das zweite Rechtecksignal 2f, das am Ausgang des Teilers 2 auftritt; Fig. 2c zeigt das Steuersignal f das am Ausgang des Teilers 3 auftritt; Fig. 2d zeigt das dem Eingang des Signalverstärkers 5 zugeführte Signal, das verstärkt am Ausgang A als Warnsignal auftritt.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.

Durch die Rechteckform des Warnsignals, wie es in Fig. 2d dargestellt ist, ergeben sich Oberwellen, die im Übertragungsbereich des Druckkammerlautsprechers liegen. Das Warnsignal wird dem Signalverstärker 5 als alternierendes Signal zugeführt, d.h. als Signal welches abwechselnd eine positive und eine negative Spannung aufweist. Wärend der gesammten Periodendauer kann somit Energie an den Signalverstärker 5 abgegeben werden, wobei eine Gleichstrommagnetisierung im Ausgangsübertrager 7 vermieden wird. Durch die Umschaltung zwischen dem ersten Rechtecksignal 4f und dem zweiten Rechtecksignal 2f mit der Frequenz der Grundwelle ergibt sich ein Signal, das in seine Spektralanteile zerlegt einen großen Anteil an 2., 3. und 4. Harmonischer Oberwelle und einen geringen Grundwellenanteil enthält. Die 2., 3. und 4. Harmonische Oberwelle liegen im Übertragungsbereich des Lautsprechers, wenn die Grundfrequenz sich etwa im Bereich von 300 Hz bis 800 Hz befindet.The rectangular shape of the warning signal, as shown in FIG. 2d, 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.

Bei dem erfindungsgemäßen Warnsignalgenerator lassen sich der zu schaltende Strom in den Endstufentransistoren und der Ausgangsübertrager klein halten.In the warning signal generator according to the invention, the current to be switched in the output stage transistors and the output transformer can be kept small.

Im dargestellten Blockschaltbild sind die Endstufentransistoren nicht im einzelnen eingezeichnet, sondern es sind zwei Verstärker 8 und 9 dargestellt, die in Verbindung mit dem Ausgangsübertrager 7 eine Gegentaktendstufe bilden.The output stages are in the block diagram shown 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.

Bei einer Weiterbildung der Erfindung ist der Rechteckgenerator so ausgebildet, daß die von ihm erzeugte Frequenz zwischen zwei Werten 4f1 und 4f2 umschaltbar ist, wozu eine periodische Steuervorrichtung 10 dient.In a further development of the invention, 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.

Claims (7)

1. Warnsignalgenerator zur Speisung eines Druckkammerlautsprechers, dessen Übertragungsbereich oberhalb einer vorgegebenen Grundwelle eines vom Druckkammerlautsprecher abzustrahlenden Warnsignals liegt, dadurch gekennzeichnet, daß das Warnsignal (Fig. 2d) einen großen Anteil von Oberwellen enthält, die in den Übertragungsbereich des Druckkammerlautsprechers (6) fallen.1. 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, characterized in that the warning signal (FIG. 2d) contains a large proportion of harmonics which fall into the transmission range of the pressure chamber loudspeaker (6). 2. Warnsignalgenerator nach Anspruch 1, dadurch gekennzeichnet, daß das Warnsignal ein zusammengesetztes Rechtecksignal ist, das aus einem ersten Rechtecksignal (4f) mit der Frequenz der vierten Oberwelle und einem zweiten Rechtecksignal (2f) mit der Frequenz der zweiten Oberwelle besteht, wobei zwischen dem ersten und zweiten Rechtecksignal (4f, 2f) mit der Frequenz der Grundwelle (f) umgeschaltet wird, so daß am Ausgang (A) des Warnsignalgenerators abwechselnd im Takt der Grundwelle (f) das erste und das zweite Rechtecksignal als Warnsignal (Fig. 2d) auftritt.2. Warning signal generator according to claim 1, characterized in that the warning signal is a composite square wave signal consisting of a first square wave signal (4f) with the frequency of the fourth harmonic and a second square wave signal (2f) with the frequency of the second harmonic, between which the first and second square wave signals (4f, 2f) are switched with the frequency of the fundamental wave (f), so that at the output (A) of the warning signal generator, the first and the second square wave signals alternately as a warning signal (Fig. 2d) in time with the fundamental wave (f) occurs. 3. Warnsignalgenerator nach Anspruch 2, dadurch gekennzeichnet, daß der Warnsignalgenerator einen Rechteckgenerator (1) enthält, der das erste Rechtecksignal (4f) mit der Frequenz der vierten Oberwelle der Grundwelle (f) des Warnsignals erzeugt, daß der Rechteckgenerator (1) einen ersten Frequenzteiler (2) speist, daß der erste Frequenzteiler (2) einen zweiten Frequenzteiler (3) speist, daß beide Frequenzteiler (2 und 3) das Teilerverhältnis 2:1 haben, daß der Ausgang des zweiten Frequenzteilers (3) mit dem Steuereingang (s) eines Umschalters (4) verbunden ist, daß am ersten Umschaltkontakt (u) des Umschalters (4) das vom Rechteckgenerator (1) erzeugte erste Rechtecksignal (4f) und am zweiten Umschaltkontakt (v) das zweite Rechtecksignal (2f), welches am Ausgang des ersten Frequenzteilers (2) auftritt, anliegt, und daß mittels des am Steuereingang (s) des Umschalters (4) anliegende Signal (f) abwechselnd das erste und das zweite Rechtecksignal (4f, 2f) auf den Ausgang (A) des Warnsignalgenerators durchgeschaltet wird.3. Warning signal generator according to claim 2, characterized in that the warning signal generator contains a square wave generator (1) which generates the first square wave signal (4f) with the frequency of the fourth harmonic of the fundamental wave (f) of the warning signal that the square wave generator (1) a first Frequency divider (2) feeds that the first frequency divider (2) feeds a second frequency divider (3), that both frequency dividers (2 and 3) have the division ratio 2: 1, that the output of the second frequency divider (3) with the control input (see ) of a changeover switch (4) that the first rectangle generated by the square wave generator (1) is connected to the first changeover contact (u) of the changeover switch (4) signal (4f) and at the second changeover contact (v) the second square wave signal (2f), which occurs at the output of the first frequency divider (2), is present, and by means of the signal (f) present at the control input (s) of the changeover switch (4) alternately the first and the second square-wave signal (4f, 2f) is switched through to the output (A) of the warning signal generator. 4. Warnsignalgenerator nach Anspruch 3, dadurch gekennzeichnet, daß zwischen dem Umschalter (4) und dem Ausgang (A) des Warnsignalgenerators ein Signalverstärker (5) angeordnet ist.4. Warning signal generator according to claim 3, characterized in that a signal amplifier (5) is arranged between the switch (4) and the output (A) of the warning signal generator. 5. Warnsignalgenerator nach Anspruch 4, dadurch gekennzeichnet, daß der Signalverstärker (5) ein Gegenverstärker ist.5. Warning signal generator according to claim 4, characterized in that the signal amplifier (5) is a counter amplifier. 6. Warnsignalgenerator nach Anspruch 1, dadurch gekennzeichnet, daß das Warnsignal nur Oberwellen enthält.6. Warning signal generator according to claim 1, characterized in that the warning signal contains only harmonics. 7. Warnsignalgenerator nach Anspruch 1, dadurch gekennzeichnet, daß die Frequenz des Rechtecksignals (4f) periodisch verschiedene Werte annimmt.7. Warning signal generator according to claim 1, characterized in that the frequency of the square wave signal (4f) periodically assumes different values.
EP80105148A 1979-09-13 1980-08-29 Warning signal generator for feeding a pressure chamber loudspeaker Expired EP0025537B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80105148T ATE8081T1 (en) 1979-09-13 1980-08-29 WARNING SIGNAL GENERATOR FOR POWERING A PRESSURE LOUDSPEAKER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2936981A DE2936981C2 (en) 1979-09-13 1979-09-13 Warning signal generator with a high proportion of harmonics to feed a pressure chamber loudspeaker
DE2936981 1979-09-13

Publications (2)

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

Family

ID=6080745

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80105148A Expired EP0025537B1 (en) 1979-09-13 1980-08-29 Warning signal generator for feeding a pressure chamber loudspeaker

Country Status (6)

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

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 (en) * 1987-06-19 1988-12-23 Hella Kg Hueck & Co ACOUSTIC SIGNAL TRANSMITTER, IN PARTICULAR FOR MOTOR VEHICLES
WO1994025956A1 (en) * 1993-04-30 1994-11-10 Federal Signal Corporation Tone generating circuit
WO2012034669A3 (en) * 2010-09-18 2012-10-26 Volkswagen Aktiengesellschaft Vehicle having an electric drive
WO2015112608A3 (en) * 2014-01-23 2015-10-22 Federal Signal Corporation Tone generation

Families Citing this family (1)

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

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2071291A5 (en) * 1969-12-23 1971-09-17 Couget Jacques
DE2104954A1 (en) * 1971-02-03 1972-09-14 Westfaelische Metall Industrie Acoustic signal generator for motor vehicles
US3810169A (en) * 1969-12-15 1974-05-07 P Locke Electronic siren system
FR2309006A1 (en) * 1975-04-26 1976-11-19 Wandel & Goltermann Mobile electro acoustic alarm signal with public address - has loudspeaker and amplifier linked to signal generator which produces rectangular impulses of modulated frequencies
FR2333314A1 (en) * 1975-11-27 1977-06-24 Klaxon Sa Loudspeaker supply circuit for acoustic alarm - provides two signals with given frequency ratio using mixer system

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 (en) * 1969-12-23 1971-09-17 Couget Jacques
DE2104954A1 (en) * 1971-02-03 1972-09-14 Westfaelische Metall Industrie Acoustic signal generator for motor vehicles
FR2309006A1 (en) * 1975-04-26 1976-11-19 Wandel & Goltermann Mobile electro acoustic alarm signal with public address - has loudspeaker and amplifier linked to signal generator which produces rectangular impulses of modulated frequencies
FR2333314A1 (en) * 1975-11-27 1977-06-24 Klaxon Sa Loudspeaker supply circuit for acoustic alarm - provides two signals with given frequency ratio using mixer system

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 (en) * 1987-06-19 1988-12-23 Hella Kg Hueck & Co ACOUSTIC SIGNAL TRANSMITTER, IN PARTICULAR FOR MOTOR VEHICLES
WO1994025956A1 (en) * 1993-04-30 1994-11-10 Federal Signal Corporation Tone generating circuit
US5754095A (en) * 1993-04-30 1998-05-19 Federal Signal Corporation Tone generating circuit
WO2012034669A3 (en) * 2010-09-18 2012-10-26 Volkswagen Aktiengesellschaft Vehicle having an electric drive
US9050925B2 (en) 2010-09-18 2015-06-09 Volkswagen Ag Vehicle having an electric drive
WO2015112608A3 (en) * 2014-01-23 2015-10-22 Federal Signal Corporation Tone generation
US9900705B2 (en) 2014-01-23 2018-02-20 Federal Signal Corporation Tone generation

Also Published As

Publication number Publication date
DK149671B (en) 1986-09-01
FI802589A (en) 1981-03-14
NO802696L (en) 1981-03-16
EP0025537B1 (en) 1984-06-20
DE2936981A1 (en) 1981-03-19
DK388480A (en) 1981-03-14
NO149367C (en) 1984-04-04
ATE8081T1 (en) 1984-07-15
DE2936981C2 (en) 1985-08-22
NO149367B (en) 1983-12-27

Similar Documents

Publication Publication Date Title
DE2351423C2 (en) Stereophonic player
DE4120537A1 (en) LOW FREQUENCY COMPENSATION CIRCUIT FOR SOUND SIGNALS
DE2518840C2 (en) Circuit arrangement to avoid acoustic feedback
DE2909634A1 (en) DOUBLE DIAPHRAGM ELECTROSTATIC CONVERTER
DE1416141B2 (en) METHOD AND ARRANGEMENT FOR STEREOPHONIC SOUND TRANSMISSION
DE3927175C2 (en) Pulse width modulation amplifier circuit
EP0017885A1 (en) Corona-effect loudspeaker
DE2624568A1 (en) STEREOPHONIC PLAYBACK DEVICE
DE3126993C2 (en)
DE3907275C2 (en) Sound system
DE2554856A1 (en) CIRCUIT ARRANGEMENT AND METHOD FOR MODULATING A MUSIC SOUND SIGNAL TO CREATE A ROTATING SOUND EFFECT
EP1248491B1 (en) Ultrasonic parametric speaker system
DE609540C (en) System for high-frequency messaging with spread sidebands
EP0025537B1 (en) Warning signal generator for feeding a pressure chamber loudspeaker
EP1216600A2 (en) Multiple speaker
EP1107640A2 (en) Device for creating harmonics in an audio signal
DE2812948C2 (en)
DE3434574C2 (en)
DE2246560C3 (en) Circuit arrangement for improving the quality of an audio frequency signal with a limited bandwidth
DE2518708C2 (en)
DE2802973A1 (en) SPEAKER
DE2711083C2 (en)
DE2558491B2 (en) VOLUME SPEAKERS
DE2518708B1 (en) Mobile electro-acoustic alarm system, so-called electronic police horn
DE706229C (en) Modulated vibration generator

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH FR GB IT LU NL SE

17P Request for examination filed

Effective date: 19810921

ITF It: translation for a ep patent filed
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): AT BE CH FR GB IT LI LU NL SE

REF Corresponds to:

Ref document number: 8081

Country of ref document: AT

Date of ref document: 19840715

Kind code of ref document: T

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19840630

Year of fee payment: 5

ET Fr: translation filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19840824

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19840828

Year of fee payment: 5

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19840831

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19840930

Year of fee payment: 5

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19850624

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19850831

Year of fee payment: 6

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19860829

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19860830

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19860831

Ref country code: CH

Effective date: 19860831

BERE Be: lapsed

Owner name: WANDEL & GOLTERMANN G.M.B.H. & CO.

Effective date: 19860831

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19870301

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
GBPC Gb: european patent ceased through non-payment of renewal fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19870430

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19881118

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Effective date: 19890831

EUG Se: european patent has lapsed

Ref document number: 80105148.3

Effective date: 19870812