GB1355803A - Road traffic information communication system - Google Patents

Road traffic information communication system

Info

Publication number
GB1355803A
GB1355803A GB1355803DA GB1355803A GB 1355803 A GB1355803 A GB 1355803A GB 1355803D A GB1355803D A GB 1355803DA GB 1355803 A GB1355803 A GB 1355803A
Authority
GB
United Kingdom
Prior art keywords
message
vehicle
channel
gate
radio
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
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB1355803A publication Critical patent/GB1355803A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096708—Systems involving transmission of highway information, e.g. weather, speed limits where the received information might be used to generate an automatic action on the vehicle control
    • G08G1/096716—Systems involving transmission of highway information, e.g. weather, speed limits where the received information might be used to generate an automatic action on the vehicle control where the received information does not generate an automatic action on the vehicle control
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/091—Traffic information broadcasting
    • G08G1/094—Hardware aspects; Signal processing or signal properties, e.g. frequency bands
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096733—Systems involving transmission of highway information, e.g. weather, speed limits where a selection of the information might take place
    • G08G1/096741—Systems involving transmission of highway information, e.g. weather, speed limits where a selection of the information might take place where the source of the transmitted information selects which information to transmit to each vehicle
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096733—Systems involving transmission of highway information, e.g. weather, speed limits where a selection of the information might take place
    • G08G1/09675—Systems involving transmission of highway information, e.g. weather, speed limits where a selection of the information might take place where a selection from the received information takes place in the vehicle
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096766—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission
    • G08G1/096783—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission where the origin of the information is a roadside individual element

Abstract

1355803 Radio signalling; radio receivers STANDARD TELEPHONES & CABLES Ltd 2 Dec 1971 [3 Dec 1970] 57454/70 Headings H4L and H3Q [Also in Division G4] A road-traffic information communication system comprises a roadside message transmitter associated with two pairs of single-frequency roadside transmitters which act to enable a given vehicle receiver channel so that the vehicle will receive routine information regarding the roadway and route ahead or emergency information, appropriate to the vehicle direction of travel. In the embodiment shown (Fig. 2) a message transmitter 201 having a short range omnidirectional aerial transmits information on two channels the information being relevant, respectively, to separate traffic flow directions. A first pair of single frequency "beacons" 203, 205 with unidirectional aerials transmit different respective frequencies F1, F2 across both lanes of traffic flow. A similar, second pair of beacons 202, 204 transmits respective frequencies F1, F3. A receiver of the vehicle embodies a channel selector arrangement responsive to particular combinations of the frequencies which are received in a given sequence to select the message channel relevant to the vehicle direction of travel. In the vehicle receiver (Fig. 4) selection and rejection of channels is effected by a logic circuit; for example, if F1 is present but other beacon frequencies F2, F3 and F4 are not present, gate 401a will open. If, subsequently, F2 and not F1, F3 and F4 appear, gate 401b opens. As a result, flip-flops 403a, 403b are set and enable the channel selector 405a which allows the audio output of channel 1 to be passed via gate 407 (when open) to the amplifier 406 and hence loud-speaker 410. When the channel has been so selected, no output occurs until a pre-message announcement tone is detected by a detector 408. This then opens gate 407. Detector 408 also drives a divide-by-three circuit 409 which, after two complete message repetitions have been received, (i.e. when a third tone is received), closes gate 407. An OR gate 415 provides an output which can be used to inhibit reception of any normal radio braodcast to which the vehicle occupant may be listening. To allow traffic messages to be received via the normal vehicle radio loud-speaker, the arrangement of Fig. 5 is provided. This will receive normal AM broadcasts which are overridden when the appropriate beacons are passed. With the vehicle ignition switch 500 closed, the UHF message-receiving circuits 501 are energized, but no message is heard until a set of beacons is passed; then a message channel is selected as above and a power relay 502 is operated to switch on the audio amplifier stage 503 of the normal vehicle radio. If the AM radio 505 is switched on at switch 504, the UHF receiver also operates a muting switch in the AM receiver 505 to provide the necessary override. The roadside transmitters are low-power, battery-operated UHF devices disposed spatially so that vehicles will receive at least two complete message repetitions. The message transmitter embodies one or more tape loops holding one message per channel, and record and playback devices.
GB1355803D 1970-12-03 1970-12-03 Road traffic information communication system Expired GB1355803A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5145470 1970-12-03

Publications (1)

Publication Number Publication Date
GB1355803A true GB1355803A (en) 1974-06-05

Family

ID=10460095

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1355803D Expired GB1355803A (en) 1970-12-03 1970-12-03 Road traffic information communication system

Country Status (1)

Country Link
GB (1) GB1355803A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2147176A (en) * 1983-08-10 1985-05-01 Motorola Inc Multiple frequency message system
GB2179824A (en) * 1985-08-29 1987-03-11 Malcolm Barry Vernon Automatic, vehicle speed reduction system
NL8600598A (en) * 1986-03-07 1987-10-01 Nederlanden Staat RADIO CONNECTION SYSTEM EQUIPPED WITH BEACON TRANSMITTERS.
GB2201865A (en) * 1987-02-10 1988-09-07 Gainsborough Holdings Ltd Mobile radio telephone system
GB2273190A (en) * 1992-12-07 1994-06-08 Neil Andrew Moss Traffic information system
FR2827416A1 (en) * 2001-07-10 2003-01-17 Jean Paul Begouen Voice warning to car drivers as they approach hazardous or controlled location, uses light from car to trigger delivery of coded radio signal indicating nature of risk at a location, and receiver in car to translate code to audible warning

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2147176A (en) * 1983-08-10 1985-05-01 Motorola Inc Multiple frequency message system
AU574379B2 (en) * 1983-08-10 1988-07-07 Motorola, Inc. Channel selection system
GB2179824A (en) * 1985-08-29 1987-03-11 Malcolm Barry Vernon Automatic, vehicle speed reduction system
NL8600598A (en) * 1986-03-07 1987-10-01 Nederlanden Staat RADIO CONNECTION SYSTEM EQUIPPED WITH BEACON TRANSMITTERS.
EP0240051A1 (en) * 1986-03-07 1987-10-07 Koninklijke KPN N.V. Radio communication system provided with beacon transmitters
GB2201865A (en) * 1987-02-10 1988-09-07 Gainsborough Holdings Ltd Mobile radio telephone system
GB2201865B (en) * 1987-02-10 1989-05-04 Gainsborough Holdings Ltd Mobile radio telephone system
GB2273190A (en) * 1992-12-07 1994-06-08 Neil Andrew Moss Traffic information system
FR2827416A1 (en) * 2001-07-10 2003-01-17 Jean Paul Begouen Voice warning to car drivers as they approach hazardous or controlled location, uses light from car to trigger delivery of coded radio signal indicating nature of risk at a location, and receiver in car to translate code to audible warning

Similar Documents

Publication Publication Date Title
US2429607A (en) Radio traffic signaling system
US4435845A (en) Automobile radio and tape cassette switching apparatus
GB625478A (en) Improvements in or relating to multichannel radio systems for communication with moving vehicles
GB1519328A (en) Diversity system
JPS6471329A (en) Mobile body satellite communication system
US3760278A (en) Limited range radiocommunication system
GB2132398A (en) A location monitoring system
US2734131A (en) Magnuski
US2495452A (en) Communication system
US3534266A (en) System for automatic transmission and reception of repetitive programs
GB1355803A (en) Road traffic information communication system
US3711651A (en) Polarity separation multiplex
GB476541A (en) Improvements in or relating to short wave wireless communication systems
JPS5851697B2 (en) Traffic information broadcast system
SE7703666L (en) FOR BATH STEREO AND MONO ADAPTED ROUND RADIO SYSTEM
FR2347839A1 (en) Duplex mode radio telephone system - employs variable switching delay dependent on signal quality for retransmission of signal
GB1429035A (en) Limited radiation communication system
GB1360718A (en) Highway communication system
EP0033218B1 (en) A message broadcasting and/or receiving system
JPS57106245A (en) Radio communication system
US2866088A (en) Radio communication within shielded enclosures
GB1591159A (en) Message-broadcasting systems
GB902031A (en) Improvements in or relating to radio transmitter control systems
JP3156972B2 (en) FM rebroadcast system
US3384894A (en) Communications system for simultaneous communications on a single channel

Legal Events

Date Code Title Description
PS Patent sealed
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PCNP Patent ceased through non-payment of renewal fee