GB1604907A - Signalling method for road vehicles and system for performing said method - Google Patents
Signalling method for road vehicles and system for performing said method Download PDFInfo
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- GB1604907A GB1604907A GB23170/78A GB2317078A GB1604907A GB 1604907 A GB1604907 A GB 1604907A GB 23170/78 A GB23170/78 A GB 23170/78A GB 2317078 A GB2317078 A GB 2317078A GB 1604907 A GB1604907 A GB 1604907A
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- warning signal
- amplifier
- frequency
- loudspeaker
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- 238000000034 method Methods 0.000 title claims description 23
- 230000011664 signaling Effects 0.000 title claims description 19
- 230000005540 biological transmission Effects 0.000 claims description 11
- 238000009434 installation Methods 0.000 claims description 4
- 238000010079 rubber tapping Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims description 3
- 230000003252 repetitive effect Effects 0.000 claims description 3
- 230000008054 signal transmission Effects 0.000 claims description 3
- 108010076504 Protein Sorting Signals Proteins 0.000 claims description 2
- 238000011156 evaluation Methods 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 2
- 108091081062 Repeated sequence (DNA) Proteins 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/07—Controlling traffic signals
- G08G1/087—Override of traffic control, e.g. by signal transmitted by an emergency vehicle
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B1/00—Systems for signalling characterised solely by the form of transmission of the signal
- G08B1/08—Systems for signalling characterised solely by the form of transmission of the signal using electric transmission ; transformation of alarm signals to electrical signals from a different medium, e.g. transmission of an electric alarm signal upon detection of an audible alarm signal
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Electromagnetism (AREA)
- Emergency Alarm Devices (AREA)
- Traffic Control Systems (AREA)
Description
(54) SIGNALLING METHOD FOR ROAD VEHICLES AND
SYSTEM FOR PERFORMING SAID METHOD
(71) We, WANDEL & GOLTERMANN
GMBH & Co., of D7412 Eningen u.A.,
Muhleweg 5, Federal Republic of Germany, a German Company, of D 7412 Eningen u.A., Muhleweg 5, Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention relates to a signalling method in which a characteristic acoustic warning signal, for example comprising a sequence of characteristic notes, which can be directly heard by the human ear is transmitted to other road users by a road vehicle.
German Patent Specification No.
1,566,952 discloses an alarm signal generator for a mobile loudspeaker system for performing such a signalling method in which more particularly the tone pitch is periodically switched between two pre-defined values.
In the known signalling system the warning signal is appreciated by ear by the other road users. This is subject to the disadvantage that owing to an excessive noise level in the vehicle of the other road user or as a result of inattention of the other road user the signal is not detected or not detected in good time by such road user or that as the result of the large sound volume with which it is transmitted in order to avoid this disadvantage, it is deemed to be exceptionally unpleasant, more particularly at night time or generally in zones with a noise prohibition (hospitals, schools, closed residential areas).
According to the present invention there is provided a signalling method in which a characteristic acoustic warning signal, comprising a repetitive sequence of notes of different, audible and predetermined frequencies, is transmitted to other road users by a road vehicle, characterised in that the warning signal is transmitted optionally with a sound level or power which is reduced by reference to a peak value, and is received, amplified, evaluated in respect of its sequence of notes and displayed aurally or visually and/or retransmitted, by electroacoustic means.
By the signalling method described above, it is possible to receive the warning signal reliably despite a large interference noise level and to indicate such signal without being influence by the noise level.
In an embodiment of the invention, there is provided a signalling method as described above wherein the warning signal can be transmitted optionally with a sound level or power which is reduced by reference to a peak value. In this way it is possible for the area in which the warning signal can be reliably received by electro-acoustic means to be served with a much reduced sound power than that necessary for reliable reception by ear of the warning signal. The area in which the reduced sound power is still felt to be unpleasant to the ear is much smaller than the area in which the warning signal is reliably received by the electro-acoustic means.
In another embodiment of the invention there is provided a system for performing the signalling method of the invention and in which on the transmission side a mobile warning signal system, including at least one loudspeaker, an amplifier driving the same and a warning signal generator which delivers the defined characteristic warning signal to the amplifier is provided for transmitting the warning signal which can be received by ear.
A system of this kind is also disclosed in the German Patent Specification 1,566,952.
It suffers from the disadvantage that only the (wide band) human ear is provided for receiving the warning signal so that in the presence of interference noise at the place of reception the warning signal can be easily missed (not noticed) due to an excessively low reception sound level or because of a poor signal-to-noise ratio and/or as a result of attention being diverted.
The German Offenlegungsschrift 22 18246 discloses a trigger circuit for a road vehicle warning device in which horn signals which occur at the rear vehicle end of very long and noisy vehicles and are emitted by following vehicles are detected after being stripped of interference noise by filtration and are signalled to the front while travelling.
The German Offenlegungsschrift 2362071 discloses a radio emergency call system in which coded accident messages are transmitted by radio from the accident emergency vehicle via central receivers, arranged in local distribution and adapted to add coded location data, are transmitted to an auxilliary centre. Finally, the subsequently published German Offenlegungsschrift 26 10443 discloses apparatus for the recognition of warning signals in traffic in which together with a conventional warning signal an ultrasonics or infra-red or radio transmitter can be switched on together with the conventional warning signal in the emergency vehicle with priority and that receivers by means of which the signals of the additional transmitter are received and signalled or evaluated, are provided in the other (normal) vehicles or traffic signalling systems.
Another embodiment of the invention avoids this disadvantage by the use of a system for performing the method described above in which on the transmission side a known mobile warning signal system, for example an electro-acoustic system with at least one loudspeaker, one amplifier for driving the same and a warning signal generator which delivers a pre-defined characteristic warning signal to the amplifier, is provided for the transmission of a warning signal which can be heard in known manner by the human ear of other road users, for example a characteristic periodically repeated sequence of characteristically predefined tones, characterised in that electroacoustic warning signal reception apparatus is provided for other road users and/or on traffic roads with traffic monitoring or traffic direction and each such warning signal reception apparatus comprises at least one electroacoustic transducer, a plurality of selection means, fed by said electroacoustic transducer and each such selection means being tuned to one of the pre-defined tones of the warning signal, a gating circuit fed by the output signal of the selection means and responding to the pre-defined sequence of tones and indicating or signalling means. In this way only apparatus capable of responding to the pre-defined characteristic warning signal are made available and their response sensitivity provides a substantially larger reception area than can be ensured if the warning signal is received directly by the human ear.
In another embodiment of the invention the system for performing the method described above includes a mobile electroacoustic warning signal system with at least one ultrasonics loudspeaker, more particularly with spheroid characteristics, or periodically varied main radiation direction, an amplifier and a warning signal generator which can be modulated with a characteristic warning signal is provided on the transmission side in the vehicle with priority and electroacoustic ultrasonics warning signal reception apparatus is provided on the reception side for other road users and/or on traffic roads with traffic monitoring or traffic control and each such reception apparatus has at least one electroacoustic transducer, more particularly with spheroid characteristics, or a periodically varied principal reception direction. an amplifier, a demodulator and a gating circuit adapted to respond to the characteristic of the warning signal and to actuate the display or signalling means. This permits completely silent and reliable warning over a large reception area.
Another particularly advantageous further embodiment of the invention comprises a system with an electroacoustic warning signal system, characterised in that the warning signal generator and/or the amplifier of the electroacoustic warning signal system is provided with a selector switch or control means, operation thereof causing the warning signal which can be detected by the human ear to be transmitted optionally with a peak value or a value reduced with respect thereto.By these means it is possible to provide a warning with a substantially reduced sound power during the night or in zones with noise prohibition so that on the one hand there is only an exceptionally small area in which the warning signal is felt to be excessively loud and on the other hand there is an adequately large zone in which the warning signal can still be received by road users without warning signal reception apparatus (cyclists, pedestrians) and finally there is a large zone in which the warning signal can be reliably received by the warning signal receiving apparatus despite a noise level which may be high.
The invention will now be described by way of example only with particular reference to the accompanying drawings wherein:
Figure 1 is a block circuit diagram of a first embodiment of a mobile electroacoustic warning signalling system (transmission side) with a reducible warning signal transmission level, showing the propagation conditions in diagrammatic form;
Fig. 2 is a diagrammatic lay-out plan of a road junction with a traffic regulating system which drives a traffic light system and is associated with warning signal reception apparatus of a second embodiment,
Figs. 3 to 8 each show a block circuit diagram of a third to eighth exemplified embodiment of a warning signal reception apparatus and
Figs. 9 to 12 each show a block circuit diagram of a ninth to twelfth exemplified embodiment of a mobile electroacoustic warning signal system (transmission side).
In the electroacoustic warning signal system illustrated in Fig. 1 a warning signal generator 1, which can be switched on by means of a first switch 2, drives an amplifier 3 which feeds a loudspeaker 4 adapted to transmit the warning signal. The control voltage delivered by the warning signal generator 1 to the amplifier 3 can be reduced by operation of a switch 5 so that the loudspeaker 4 transmits the warning signal either at a maximum level (peak level) or at a level which is substantially reduced by contrast to the former.
Transmission of the warning signal with the peak level results in a relatively large zone a, marked by a boundary 6, around the loudspeaker 4 in which the warning signal is felt to be excessively loud and is adjoined by a zone b, marked by a boundary 7, in which the warning signal can be readily heard by the human ear. This is followed by a zone c in which the warning signal cannot be heard with reliability or at all.
Boundaries 6' and 7' and therefore substantially reduced zones a' and b' are obtained closer to the loudspeaker 4 if the level is reduced. However, the warning signal can be reliably received and indicated up to a boundary 8' and therefore in a zone d' which is greater than the zone b (peak value) by using warning signal reception apparatus (Figs 3 to 9). It is only in the zone e' which adjoins the outside of the zone d' that the warning signal cannot be received reliably or at all by means of warning signal reception apparatus.
In the traffic regulating system of Figure 2 which protects a road junction 9 and has three traffic lights 10, Il, 12, a warning signal reception apparatus 13. 14. 15 is installed fixedly in front of each of such traffic lights and the signalling means of the reception apparatus (for example the relay 37 in Fig. 5) is connected to the control system 16 for the traffic lights 10, Il, 12. In this way it is possible on reception of a warning signal from one of the three directions to release traffic in the said direction or to block the other directions.
The embodiment illustrated in Fig. 3 is intended for the reception of a warning signal whose sequence comprises three different tones. Three selective channels are therefore provided each comprising a microphone 17, 17', 17", an amplifier 18, 18', 18", a band-pass filter 19, 19', 19", tuned to the relevant warning signal tone, and a rectifier 20, 20', 20". The output signals of the rectifiers 20, 20', 20" are applied to an exclusive OR-network 21 which drives a gating device 22 adapted to deliver a flashing pulse voltage to a signal lamp 23 if the output signal of the exclusive OR-network 21 is applied constantly or with interruptions which are permissibly short.
The embodiment illustrated in Fig. 4 is intended for the reception of a warning signal comprising a periodic sequence of two different tones of the same duration. It therefore comprises only two selective channels 24 to 27 and 24' to 27'. The pulse dc output voltages of the two channels are connected to the inputs of a differential amplifier 28. On reception of the warning signal the output of the said amplifier will therefore supply a square-wave voltage with the tone switching frequency of the warning signal (for example approximately 1 Hz) which drives a rectifier 30, via a low-pass filter 29 tuned to the said frequency, and the said rectifier actuates a warning signal lamp 31.
The embodiment illustrated in Fig. 5 is similar to that shown in Fig. 3 with the exception of the use of N path filters 32, 32' and controlled rectifiers 33, 33'. Two phaselocked oscillators 34, 34' (PLL) which are connected to the outputs of the amplifiers 35, 35' of the two channels and each of which has only a small reception range covering the relevant specified audio frequency of the appropriate channel, are provided to generate the control voltages required to this end.
A relay 37, which can be actuated by the output signal of the rectifier 36, is also provided.
The embodiment illustrated in Fig. 6 is intended for a warning signal with three different tones in sequence. The warning signal is received by a microphone 38 and applied via an amplifier 39 to three bandpass filters 40, 40', 40", which are tuned to the different warning signal tones and are connected in parallel with each other on the input and output side. A phase-locked oscillator 41, whose reception range includes all three signal tone frequencies and whose dc oscillator control voltage (internal phase meter output voltage), is applied to a window discriminator 42 which has three observation windows at the three phase-meter output voltages which are produced by the phaselocked oscillator 41 at the three warning signal tone frequencies.The output signal of the window discriminator 42 actuates a warning signal flashlamp 44 and a buzzer 45 via a gating circuit 43 which monitors the sequence.
The seventh exemplified embodiment illustrated in Fig. 7 differs from the fifth embodiment substantially in that the control voltages for its N path filters 46, 46' and controlled rectifiers 47, 47' can be derived from a frequency-stabilized master generator 48 and frequency dividers 49, 49' disposed downstream thereof so that filters of very narrow bandwidth can be employed and a high degree of security against interference can be achieved. Furthermore, this system makes use of selective microphones 50, 50', each of which is tuned to one warning note frequency.
The eighth embodiment illustrated in Fig.
8 contains a branch for receiving an ultrasonic signal modulated with the warning signal, in addition to the system illustrated in
Fig. 4. An ultrasonics microphone 51 with spheroid characteristics is provided to this end and drives a discriminator 54 via an amplifier 52 and a band-pass filter 53, and the output signal of the said discriminator actuates the warning flashlamp 57 via the band-pass filter 55, tuned to the not switching frequency of the warning signaL and the gating circuit 56.
In the electroacoustic warning signal system illustrated in Fig. 9 a warning signal generator 59, which can be switched on and off with a switch 58, directly controls an amplifier 61 via a selector switch 60 in one position thereof, and the said amplifier drives a loudspeaker 62. In the other position of the selector switch 60 the amplifier 61 is driven at a reduced level from the tapping of a voltage divider 60, which is connected to the warning signal generator 59.
In the embodiment illustrated in Fig. 10 an electrically continuously variable voltage divider 65 is connected between a warning signal generator 63 and the input of an amplifier 64, the control voltage of said voltage divider being supplied by the output of an interference sound meter 66 which measures the external interference noise via a wide-band microphone 67 and an amplifier 68 during the intervals of the warning signal sequence. During the intervals a release signal is supplied to the interference sound meter 66 by a clock 69 which controls the sequence of the warning signal generator 63.
The embodiment illustrated in Fig. 11 refers to a transmission side which operates with frequency-modulated ultrasonics. A continuous tone audio generator 70, having a frequency of approximately 300 Hz, modulates the frequency of the ultrasonics generator 71 with a mean frequency of approximately 16 kHz which drives an omnidirectional ultrasonics loudspeaker 73 via an amplifier 72.
This arrangement can be modified for amplitude modulation by using an amplitude modulator for the block 71 which is connected on the one hand to the warning signal generator 70 and on the other hand to a carrier wave oscillator 74.
The system illustrated in Fig. I 1 can be modified by using a loudspeaker with a directional characteristic instead of a loudspeaker with an omnidirectional characteristic and in which the principal radiation direction is periodically pivoted, for example by rotation of the loudspeaker or of a reflection member irradiated by the loudspeaker.
In the embodiment illustrated in Fig. 12 a warning signal generator 75 on the one hand controls a frequency-modulatable ultrasonics generator 76 which drives an ultrasonics loudspeaker 78 via a first amplifier 77 and on the other hand, in a first position of the selector switch 79, directly feeds an amplifier 81 which drives a loudspeaker 82 and in a second position of said switch provides the feed from the tapping of the voltage divider 80 to drive an amplifier 81 which feeds a loudspeaker 82.
WHAT WE CLAIM IS:
1. A signalling method in which a characteristic acoustic warning signal comprising a repetitive sequence of notes of different, audible and predetermined frequencies, is transmitted to other road users, by a road vehicle, characterised in that the warning signal is transmitted optionally with a sound level or power which is reduced by reference to a peak value, and is received, amplified, evaluated in respect of its sequence of notes, and displayed aurally or visually and/or retransmitted, by electro-acoustic means.
2. A method as claimed in Claim 1 characterised in that the warning signal is received in the vehicle of another road user.
3. A method as claimed in Claim 1, characterised in that the warning signal is received in a traffic-regulating system and retransmission is effected at a control device forming part of the traffic-regulating system.
4. A method as claimed in any of the preceding claims, characterised in that the characteristic on the transmission side, is derived from a close-tolerance reference frequency and that on the reception side closetolerance reference frequencies are used as comparison in evaluation.
5. A system for performing the method claimed in Claim 1 in which the vehicle transmits the warning signal from an installation for transmitting the warning signal including at least one loudspeaker, an amplifier supplying the loudspeaker and a warning signal generator which supplies the warning signal to the amplifier, the installation for transmitting the warning signal including a change-over switch or control device, and warning signal reception apparatus for other
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (20)
- **WARNING** start of CLMS field may overlap end of DESC **.sequence.The seventh exemplified embodiment illustrated in Fig. 7 differs from the fifth embodiment substantially in that the control voltages for its N path filters 46, 46' and controlled rectifiers 47, 47' can be derived from a frequency-stabilized master generator 48 and frequency dividers 49, 49' disposed downstream thereof so that filters of very narrow bandwidth can be employed and a high degree of security against interference can be achieved. Furthermore, this system makes use of selective microphones 50, 50', each of which is tuned to one warning note frequency.The eighth embodiment illustrated in Fig.8 contains a branch for receiving an ultrasonic signal modulated with the warning signal, in addition to the system illustrated in Fig. 4. An ultrasonics microphone 51 with spheroid characteristics is provided to this end and drives a discriminator 54 via an amplifier 52 and a band-pass filter 53, and the output signal of the said discriminator actuates the warning flashlamp 57 via the band-pass filter 55, tuned to the not switching frequency of the warning signaL and the gating circuit 56.In the electroacoustic warning signal system illustrated in Fig. 9 a warning signal generator 59, which can be switched on and off with a switch 58, directly controls an amplifier 61 via a selector switch 60 in one position thereof, and the said amplifier drives a loudspeaker 62. In the other position of the selector switch 60 the amplifier 61 is driven at a reduced level from the tapping of a voltage divider 60, which is connected to the warning signal generator 59.In the embodiment illustrated in Fig. 10 an electrically continuously variable voltage divider 65 is connected between a warning signal generator 63 and the input of an amplifier 64, the control voltage of said voltage divider being supplied by the output of an interference sound meter 66 which measures the external interference noise via a wide-band microphone 67 and an amplifier 68 during the intervals of the warning signal sequence. During the intervals a release signal is supplied to the interference sound meter 66 by a clock 69 which controls the sequence of the warning signal generator 63.The embodiment illustrated in Fig. 11 refers to a transmission side which operates with frequency-modulated ultrasonics. A continuous tone audio generator 70, having a frequency of approximately 300 Hz, modulates the frequency of the ultrasonics generator 71 with a mean frequency of approximately 16 kHz which drives an omnidirectional ultrasonics loudspeaker 73 via an amplifier 72.This arrangement can be modified for amplitude modulation by using an amplitude modulator for the block 71 which is connected on the one hand to the warning signal generator 70 and on the other hand to a carrier wave oscillator 74.The system illustrated in Fig. I 1 can be modified by using a loudspeaker with a directional characteristic instead of a loudspeaker with an omnidirectional characteristic and in which the principal radiation direction is periodically pivoted, for example by rotation of the loudspeaker or of a reflection member irradiated by the loudspeaker.In the embodiment illustrated in Fig. 12 a warning signal generator 75 on the one hand controls a frequency-modulatable ultrasonics generator 76 which drives an ultrasonics loudspeaker 78 via a first amplifier 77 and on the other hand, in a first position of the selector switch 79, directly feeds an amplifier 81 which drives a loudspeaker 82 and in a second position of said switch provides the feed from the tapping of the voltage divider 80 to drive an amplifier 81 which feeds a loudspeaker 82.WHAT WE CLAIM IS: 1. A signalling method in which a characteristic acoustic warning signal comprising a repetitive sequence of notes of different, audible and predetermined frequencies, is transmitted to other road users, by a road vehicle, characterised in that the warning signal is transmitted optionally with a sound level or power which is reduced by reference to a peak value, and is received, amplified, evaluated in respect of its sequence of notes, and displayed aurally or visually and/or retransmitted, by electro-acoustic means.
- 2. A method as claimed in Claim 1 characterised in that the warning signal is received in the vehicle of another road user.
- 3. A method as claimed in Claim 1, characterised in that the warning signal is received in a traffic-regulating system and retransmission is effected at a control device forming part of the traffic-regulating system.
- 4. A method as claimed in any of the preceding claims, characterised in that the characteristic on the transmission side, is derived from a close-tolerance reference frequency and that on the reception side closetolerance reference frequencies are used as comparison in evaluation.
- 5. A system for performing the method claimed in Claim 1 in which the vehicle transmits the warning signal from an installation for transmitting the warning signal including at least one loudspeaker, an amplifier supplying the loudspeaker and a warning signal generator which supplies the warning signal to the amplifier, the installation for transmitting the warning signal including a change-over switch or control device, and warning signal reception apparatus for otherroad users and/or on traffic roads with traffic monitoring or traffic direction and each such warning signal reception apparatus comprises at least one electroacoustic transducer, a plurality of selection means, supplied by the transducer each being tuned to one of the predetermined notes of the warning signal, a gating circuit fed by the output signal of the selection means and responding to the sequence of notes and indicating or signalling means.
- 6. A system as claimed in Claim 5, characterised in that the warning signal reception apparatus is provided with a selective channel for each characteristic tone of the warning signal, each channel having at least one microphone, a tone filter, an amplifier and a rectifier and an exclusive OR-network which is biased by the output signals of the rectifiers and whose output signal controls the display or signalling means.
- 7. A system as claimed in Claim 6, characterised in that a differential amplifier and a band-pass or low-pass filter driven by said differential amplifier and tuned to a tone switching frequency of the sequence, is provided in place of the exclusive OR-circuit for a warning signal with only two tones.
- 8. A system as claimed in Claim 6 or 7, characterised in that for each characteristic tone of the warning signal is provided a N path tone filter and/or a keyed rectifier and for the control (keying) thereof a synchronizing oscillator which has a limited reception range.
- 9. A system as claimed in Claim 5, characterised in that the warning signal reception apparatus has a single selective reception channel for each of the different tones of the warning signal and a frequency discriminator the output of which is evaluated for the presence of the defined tone sequence and/or its repetition period.
- 10. A system as claimed in Claim 9, characterised in that the frequency discriminator is a phase-locked synchronizing oscillator with a broad reception range which covers all tones of the warning signal.
- 11. A system as claimed in Claim 5, characterised in that the warning signal generator contains a master generator with stabilized frequency from which the frequencies of the tones, the sequence and their repetition frequency are derived.
- 12. A system as claimed in Claim 11, characterised in that the warning signal reception apparatus is provided with a master generator connected to a divider system for controlling N path filters and/or rectifiers and/or the gating circuit for the sequence and its repetition frequency.
- 13. A system as claimed in Claim 5, characterised in that the display means delivers an optical signal and/or an acoustic signal.
- 14. A system as claimed in Claim 5, characterised in that a radio receiver or an Elak system which may be present in the vehicle of the road user, is muted together with the operation of the display means.
- 15. A system as claimed in Claim 5, wherein the signalling means comprise a relay.
- 16. A system as claimed in Claim 5, characterised in that the warning signal reception apparatus has a selective channel for only one of the characteristic tones of the warning signal and each of such channels has at least one filter, one amplifier and one rectifier and a gating circuit adapted to respond to the appearance of the relevant tone in the sequence.
- 17. A system as claimed in any of the Claims 6 to 8, characterised in that the microphones are selectively tuned to the relevant tone of the warning signal.
- 18. A system as claimed in any of Claims 5 to 17 with an electroacoustic warning signal system, characterised in that the warning signal generator and/or the amplifier of the electroacoustic warning signal system is provided with a selector switch or control means, operation thereof causing the warning signal which is detectable by the human ear to be transmitted optionally with a peak value or a value reduced with respect thereto.
- 19. A system as claimed in Claim 18 for a warning signal containing a pause, characterised in that an electroacoustic warning signal system with a warning signal transmission level which is adjustable continuously or in several steps and an interference sound meter adapted to be switched on during the pause in the sequence and whose measured value determines the warning signal transmission level, is provided in the vehicle with priority.
- 20. A mobile electroacoustic warning signal system as claimed in Claim 5 and substantially as hereinbefore described and as shown in Figure 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, I I or 12 of the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19772725009 DE2725009A1 (en) | 1977-06-02 | 1977-06-02 | SIGNALING PROCEDURES FOR VEHICLES GIVING THE RIGHT OF WAY AND ARRANGEMENT FOR THEIR IMPLEMENTATION |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1604907A true GB1604907A (en) | 1981-12-16 |
Family
ID=6010580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB23170/78A Expired GB1604907A (en) | 1977-06-02 | 1978-05-26 | Signalling method for road vehicles and system for performing said method |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS5417000A (en) |
| BE (1) | BE867721A (en) |
| DE (1) | DE2725009A1 (en) |
| FR (1) | FR2392846A1 (en) |
| GB (1) | GB1604907A (en) |
| IT (1) | IT7823849A0 (en) |
| NL (1) | NL7805376A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109313853A (en) * | 2016-09-09 | 2019-02-05 | 华为技术有限公司 | Vehicle road and bridge project method, apparatus and terminal |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0091276A3 (en) * | 1982-04-05 | 1985-03-06 | Marten C. Jensen | Sound pattern discrimination system |
| IT1196569B (en) * | 1986-08-06 | 1988-11-16 | Over Italia Srl | IMPROVEMENT IN SYSTEMS FOR TEMPORARY CONTROL AND ADAPTATION OF THE TRAFFIC LIGHT REGULATION |
| US4864297A (en) * | 1987-10-14 | 1989-09-05 | Tekedge Development Corp. | Siren detector |
| CN107316475B (en) * | 2017-07-14 | 2022-04-12 | 广州大正新材料科技有限公司 | Traffic safety scheduling method and system based on shared information |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2355607A (en) * | 1940-03-25 | 1944-08-15 | Shepherd Judson O'd | Control system |
| GB823311A (en) * | 1956-05-08 | 1959-11-11 | Tele F Lux | Device for detecting and repeating selectively sound signals emitted by overtaking vehicles |
| US3881169A (en) * | 1973-06-01 | 1975-04-29 | Traffic Control Products Inc | Emergency vehicle traffic controller |
| US3992656A (en) * | 1975-09-11 | 1976-11-16 | Joy Ivan L | Siren detector |
-
1977
- 1977-06-02 DE DE19772725009 patent/DE2725009A1/en not_active Ceased
-
1978
- 1978-05-18 NL NL7805376A patent/NL7805376A/en not_active Application Discontinuation
- 1978-05-26 JP JP6319578A patent/JPS5417000A/en active Pending
- 1978-05-26 GB GB23170/78A patent/GB1604907A/en not_active Expired
- 1978-05-26 IT IT7823849A patent/IT7823849A0/en unknown
- 1978-06-01 BE BE188251A patent/BE867721A/en unknown
- 1978-06-02 FR FR7817227A patent/FR2392846A1/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109313853A (en) * | 2016-09-09 | 2019-02-05 | 华为技术有限公司 | Vehicle road and bridge project method, apparatus and terminal |
| US11854386B2 (en) | 2016-09-09 | 2023-12-26 | Huawei Technologies Co., Ltd. | Vehicle right-of-way management method and apparatus, and terminal |
Also Published As
| Publication number | Publication date |
|---|---|
| NL7805376A (en) | 1978-12-05 |
| IT7823849A0 (en) | 1978-05-26 |
| DE2725009A1 (en) | 1978-12-07 |
| JPS5417000A (en) | 1979-02-07 |
| BE867721A (en) | 1978-10-02 |
| FR2392846A1 (en) | 1978-12-29 |
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