摘要:
The portable appliance informs users about waiting times at stops in a bus network, the appliance comprising a radio receiver to receive data enabling waiting times to be determined, an interrogation keypad, a central unit for evaluating the estimated time of arrival of the next bus at a particular stop, a screen for displaying the waiting time for said bus, and a sound emitter. The central unit is designed to update cyclically the estimated time of arrival for the next bus and to actuate the sound emitter when said estimated time of arrival differs excessively from the time of arrival initially estimated the last time the appliance was interrogated by the user.
摘要:
To decode a multivalent electrical signal capable of taking up a number n of states greater than two, an electrical magnitude representative of the state of the signal is measured successively in successive pause periods of constant duration T during which said electrical magnitude remains substantially constant. The measurements are performed at constant time intervals starting from a time origin which is determined by performing close-together measurements during a synchronization period in order to identify the pause periods: the time origin is then fixed in the middle of one of said pause periods.
摘要:
The installation is designed to inform users of a bus network about waiting times for buses at stops in the network. An installation comprises a central station suitable for transmitting radio signals about the real instantaneous positions of the buses, and portable receiver appliances (1) suitable for displaying bus waiting times on screens (4). Each appliance can also serve as a ticket for travel purposes, being provided, for this purpose, with means (10) containing "validity" data (e.g. corresponding to a sum of money or to an expiry date) that can be checked remotely by "ticket-stamper" means (9) and that is also remotely "renewable" from the central station.
摘要:
The invention concerns a central base for a private wireless local area network wherein the central base includes electronic circuits that include an electronic central unit and which is supplied with electricity with at least one live supply line intended to be connected to an external electricity power source. The central base is suitable for communicating on the one hand with a public telecommunication network, and on the other hand with at least one wireless peripheral device according to a digital bi-directional wireless protocol for a private wireless local area network.
摘要:
The invention concerns a local combined telephone and an alarm system comprising a central base communicating through two-way radio channel, according to a multiple access communication protocol, with telephone stations and detectors adapted to detect an emergency situation. The base transmits at regular intervals of less than 10 minutes, scanning messages addressed to the detectors and determines whether the detectors are operating, depending on whether it receives clearance messages from the detectors.
摘要:
To measure the absolute speed of a body 100 moving relative to the ground 33 using an onboard speed sensor 1, a radar wave is transmitted towards the ground by an antenna with a wide aperture angle. The wave reflected by a reflecting obstacle on the ground and the transmitted wave are mixed and the frequency content of the low frequency signal obtained is determined. The speed of the moving object and the height of the transmitter and receiver antennas above the ground can then be measured by adjusting a theoretical curve to the time-varying evolution of the Doppler frequency corresponding to the reflecting obstacle.
摘要:
A public display panel includes an external casing which has at least one transparent opening, a support band made of flexible material which carries juxtaposed posters, and a driving mechanism for selectively displaying posters opposite the transparent opening. This display panel further includes an electronic interface adapted to receive data representing new posters to be printed on the support band, an electronic central unit communicating with the interface, and a printer controlled by this central unit for printing new posters on the support board.
摘要:
The invention concerns a traffic information device comprising a portable one-way messaging receiver (10), designed to provide motorists with information concerning running times in a road network, said receiver comprising a keyboard (12) receiver memory contains, for each road network section, a starting point, an arrival point and an elementary running time. Moreover, the central unit is adapted to update the elementary running times of the sections on the basis of received radio messages, and to compute and display the global running time between a starting point and an arrival point as required, based on the stored elementary running times.
摘要:
The installation is intended to inform users of a bus network about waiting times for buses at stops in the network, the installation including a central station suitable for transmitting radio signals relating to the real instantaneous positions of the buses and portable receiver appliances (1) suitable for displaying waiting times on their own screens (3). Each appliance has an appliance identification symbol recorded therein and also (at 11) an expiry date, and it is possible to obtain the desired displays on the screen only if said appliance is used earlier than said date. Provision is made for renewing the appliance remotely for new subscription periods at the end of each subscription.
摘要:
A system for informing users of a bus network about waiting times for buses at stops of the network comprises means (3-6) for generating and transmitting electrical signals representative of the distance (d) between each bus (1) and the "next" stop (2), and means (7) associated with each stop and organized to receive said signals, to select therefrom those signals that concern said stop, and to display at said stop data relating to the waiting times for the "approaching" buses. The system also includes means for generating electrical signals representative of two past real average bus speeds relating to two different periods immediately before the instant at which the signals are generated, and means for using the average speeds in order to determine the waiting times to be displayed.