摘要:
The invention relates to an electronic circuit for remote interrogation of a receiver through a two wire line and to detect the response signals emitted by this receiver. The circuit comprises means for comparing with a reference voltage the actual voltage defining said response signals. This reference voltage is a weighted variable voltage obtained by low band-pass filtering, in a resistance-capacity circuit, of said actual voltage.
摘要:
A portable case (2) is provided for emitting, in response to pressure on a push button (1), a control signal (S) coded in accordance with a code recorded in said case. Timing means (8) are provided for automatically neutralizing the code when a predetermined time has elapsed from a predetermined moment, which then makes the case inoperative.
摘要:
.[.The invention relates to a flexible composite sheet designed to constitute an undersheet behaving as an electromechanical transducer in order to detect the apnea of subjects lying on it. This sheet comprises, in addition to a foil sensitive to pressure in the sense of electromechanical transduction (an electret or polarized piezoelectric foil), two film electrodes and two protective foils. Spacing shims are glued to the two foils against which they are juxtaposed. When the sensitive foil is an electret, the shims are directly interposed between the sensitive foil and one of the two electrodes. When the sensitive foil is a polarized piezo-electric foil, the shims are directly interposed between one of the electrodes and the corresponding external protective foil..]. .Iadd.An apnea monitor/alarm consists of an electronic monitor circuit to actuate an alarm responsive to the output of a sheet-like electromechanical transducer. The transducer consists of an electret or polarized piezoelectric foil responsive to pressure to generate corresponding electrical signals, two film electrodes, and two protective foils. Shims are glued to two of the foils for spacing. If an electret sensor foil is used, the shims are directly interposed between the sensitive foil and one of the electrodes. If the sensitive foil is a polarized piezoelectric foil, the shims are directly interposed between one of the electrodes and the corresponding external protective foil. .Iaddend.
摘要:
An installation for controlling and monitoring the different coded locks of an assembly embodying: An issuer for elaborating coded keys for controlling said locks and a reader associated with each lock, adapted for unlocking this lock on simple presentation thereto of a correctly coded key, this issuer and this reader being adapted so that detection by said reader of the code y recorded by said issuer on each new key of order p assigned to the lock associated with this reader results in the invalidation of the code x recorded on the key of order p-1 previously assigned to this lock, each code y being derived from code x by an algorithm y=f(x) stored at least in the issuer. At any time the reader is responsive simultaneously to a number m greater than 2 of a non invalidated codes of the succession x, f(x), f.sup.2 (x) . . . f.sup.n (x) and is adapted so that by reading any one of these codes it automatically invalidates all the lower rank codes of the succession considered.
摘要:
The invention relates to devices for controlling accesses of the security chamber type which comprise at least two doors (2, 3). A single program selector (14, 15) with easy and instant control allows the security chamber operating program to be chosen at will from several predetermined programs.
摘要:
To provide a remote control by means of coded signals, a portable transmitter case (3) is used comprising, on the one hand, a keyboard (5) with keys (6) for directly forming the coded signal on said case and, on the other hand, means for recording this coded signal, for storing it in the memory for a time t.sub.o at the end of which it is automatically erased, as well as a control button (10) ensuring the instantaneous transmission of the signal thus previously stored in the memory.
摘要:
For reading a coded sequence of magnetic signals recorded on a card, which sequence is formed of bits of identical duration the reading of which results, for the 0s, in a single change of level of an electric voltage, and for the 1s, in two such changes evenly spaced apart in time, the real duration of each bit read is measured, and the time of identification of each bit is adjusted depending on the real duration t.sub.0 of the preceding bit and on the nature of this preceding bit by giving to the time interval T which separates the end of reading of this preceding bit and the time of identifying the following bit, if the preceding bit is a 1, a value T.sub.1 equal to 5/8 of t.sub.0 or to 11/16 of t.sub.0 and if the preceding bit is a 0, a value t.sub.0 equal to 7/8 of t.sub.0, or else equal to 13/16 of t.sub.0 if the bit preceding the above 0 was again a 0 and to 15/16 of t.sub.0 in the opposite case.
摘要:
The invention relates to a coded locking device actuated by successive pushes on two buttons. This device comprises means for converting the pushes on the two buttons into electrical pulses emitted respectively along two channels and an electronic unit adapted to identify the pulse trains successively emitted in the two channels, to count the numbers of pulses of the different successive trains, to compare each sequence of pulse trains with a memorized reference or code sequence and to emit an unlocking signal S if the two sequences are identical. To form each sequence of actual pulses, the user can start by pressing either one of the two buttons.
摘要:
The invention relates to a flexible composite sheet designed to constitute an undersheet behaving as an electromechanical transducer in order to detect the apnea of subjects lying on it. This sheet comprises, in addition to a foil sensitive to pressure in the sense of electromechanical transduction (an electret or polarized piezo-electric foil), two film electrodes and two protective foils. Spacing shims are glued to the two foils against which they are juxtaposed. When the sensitive foil is an electret, the shims are directly interposed between the sensitive foil and one of the two electrodes. When the sensitive foil is a polarized piezo-electric foil, the shims are directly interposed between one of the electrodes and the correspoding external protective foil.
摘要:
Bidimensional detector of ionizing radiation and manufacturing process for the detector. The detector includes a block created from a material which releases secondary particles by interaction with incident ionizing radiation with an energy level greater than or equal to 100 keV. The thickness of the block is at least equal to one-tenth of the mean free path traveled by the incident ionizing radiation particles in the material. Parallel slits run through the block and the slits are filled with a fluid configured to interact with the secondary particles to produce other particles representing the radiation. The block, and then the slits, are formed, for example, by waterjet cutting, electrical discharge machining, or roll-out stretch wire. The bidimensional detector can be used, for example, for radiographic purposes.