摘要:
In order to monitor a large-dimension environment, a plurality of emitters is provided and a central emitter (1) allocates, to each of the emitters, an identifier allowing the identification of each emitter in the environment, a parent identifier that can transmit information to an emitter, and a child identifier which is the furthest away, the identifier of which has the largest value towards which an emitter can transmit. When an alert indicating a change in the environment is generated by one of the emitters and sent to the central emitter, said identifiers allow an optimum and secure transmission towards the central emitter, and likewise, when a message is sent from the central emitter towards an emitter.
摘要:
The invention concerns a method for transmitting in an area (100) information items in the form of sound waves representing a signal X(t), through a loudspeaker enclosure (2), said method comprising a step of setting up a public address system which consists in applying to the input of the loudspeaker enclosure (2) an electric signal P(t)=W(t) .Sc(f), wherein f represents the frequency, t0 is a constant Sc(f)=1/(S1(f)) , alpha being a non-null positive number and S1(f) being a real function obtained by peak clipping of the modulo I S(f) I of the frequency response S(f) of S(t).
摘要:
The invention concerns a method for transmitting in an area (100) information items in the form of sound waves representing a signal X(t), through a loudspeaker enclosure (2), said method comprising a step of setting up a public address system which consists in applying to the input of the loudspeaker enclosure (2) an electric signal P(t)=W(t) .Sc(f), wherein f represents the frequency, t0 is a constant Sc(f)=1/(S1(f)) , alpha being a non-null positive number and S1(f) being a real function obtained by peak clipping of the modulo I S(f) I of the frequency response S(f) of S(t).
摘要:
When the overall power invoked on the installations of an electricity supplier (1) by all the customers approaches the maximum electricity production or transport capacity, a situation termed saturation, this electricity supplier uses transmission means (12) to transmit an alert message (100) to the customers whose processing means (41) after receipt of this alert message send a command to disconnect non-priority appliances (42) and then when the overall power invoked on the installations of the electricity supplier reduces and moves away from saturation, the transmission means transmit an end-of-alert message (103) and the processing means of the customers after receipt of this message send a command to reconnect the appliances which had been disconnected.
摘要:
The invention concerns methods for authenticating images taken by camera systems (3) for photographing offending vehicles (1), for example upon excess of authorized speed limit, wherein means are provided for supplying data concerning the offence, such as the vehicle speed, the date, the time and the location of the offence and applying various processes which enable the images to be used, to detect any manipulations performed on said images.