This disclosure relates to a station for a data transmission network which is adapted to operate in a cyclic mode for contending for access to the network channel along with other stations of the network. The three states of the cycle are the idle state, the packet-being-transmitted state and the acknowlegement period state. Each station will not begin transmission until it determines that the channel is in an idle state. Once the station has determined that the channel is idle, it will then delay for a period of time that is randomly chosen and, if the channel is still idle, will then begin transmission. In this way, contention conflicts between stations is minimized without unduly restricting communication between stations. Following transmission, the channel will again be quiescent a short period of time before the acknowledgement signal is transmitted from the receiver. Each packet of data to be transmitted is of a fixed length so as to provide for synchronization between various stations contending for access to the channel.

A local area contention network data communication system

A zener diode random number generator circuit is described which produces a random binary number output having a statistical distribution exhibiting a controlled degree of randomness determined in response to an input control signal. A microprocessor feedback circuit monitors the random number output and produces the input control signal in response to the difference between the degree of randomness of the output signal and that of a pre-determined statistical distribution. The digital feedback automatically adjusts the zener diode biasing point and the limiter threshold such that part-to-part tolerance, component aging, temperature variations, or voltage fluctuations will not adversely affect the randomness of the bit stream output. In the preferred embodiment, the microprocessor tests the ratio of ONES bits to ZERO bits of the random number such that a desired 1:1 ONES/ZERO ratio is approximated.

Random number generator with digital feedback

A fault tolerant actuation system (12) for flight control systems is provided The fault tolerant actuation system (12) includes a plurality of primary flight computers (14a, 14b, and 14c) with corresponding power control units (24a, 24b, and 24c) Each power control unit includes a remote electronic unit (18a, 18b, and 18c), an electro-hydraulic servo valve (26a, 26b, and 26c), and an actuator (28a, 28b, and 28c) The actuators are linked to a flight control surface (30) to control its position The electro-hydraulic servo valves (26a, 26b, and 26c) and the actuators (28a, 28b, and 28c) include sensors that monitor their operation Each RE (18a, 18b, and 18c) generates a control current (i 1 , i 2 , and i 3 ) based upon commands of the corresponding primary flight computer as well as feedback data transmitted from the sensors of the corresponding electro-hydraulic servo valve and actuator only The feedback data is transmitted along separate servo loops having separate compensations (66a, 70a) A current equalization control (34a, 34b, and 34c) equalizes the control currents with one another A force fight equalization control (36a, 36b, and 36c) equalizes the forces of the actuators with one another

Fault tolerant actuation system for flight control actuators

An RNG circuit is connected to the parallel port of a computer. The circuit includes a flat source of white noise and a CMOS amplifier circuit compensated in the high frequency range. A low-frequency cut-off is selected to maintain high band-width yet eliminate the 1/f amplifier noise tail. A CMOS comparator with a 10 nanosecond rise time converts the analog signal to a binary one. A shift register converts the serial signal to a 4-bit parallel one at a sample rate selected at the knee of the serial dependence curve. Two levels of XOR defect correction produce a BRS at 20 kHZ, which is converted to a 4-bit parallel word, latched and buffered. The entire circuit is powered from the data pins of the parallel port. A device driver interface in the computer operates the RNG. The randomness defects with various levels of correction and sample rates are calculated and the RNG is optimized before manufacture.

Random number generator and generation method

A floor treatment apparatus is provided that includes a chassis that supports at least one cleaning element. The chassis is supported by a plurality of wheels, one which is steerable via a steering wheel interconnected to a housing also associated with the chassis. The chassis provided includes a plurality of movable housing members, one of which is associated with the steering wheel. To access the internal components of the floor treatment apparatus, the front housing is rotated or moved away from the other housings wherein the steering wheel does not require disconnection to allow this movement.

Floor cleaning apparatus

The present invention relates to a binary random noise generator for the stochastic coding of digital or analog information, comprising a comparator having two inputs, one of which receives a reference voltage and the other a random analog noise coming from a source of noise, said comparator supplying at its output a binary signal with random transitions, said generator comprising a clock and a logic system which, on the one hand, effect the sampling of the binary signal with random transitions in synchonism with the frequency of said clock and, on the other hand, ensure the strict equiprobality of the two logic states of said binary signal with random transitions, without increasing the radius of correlation. The invention is more particularly applied to the stochastic coding of information with a view to calculation or transmission, with equidistribution of binary variable.

Analog noise generator

In a servocontrol device for controlling a control surface of an aircraft, which device is associated with a mechanical control member such as control column, wheel, pedals, and which comprises two identical double-acting hydraulic rams, integral with each other and each controlled by means of a slide valve, the slide valves each being controlled by a servovalve, whilst each servovalve is controlled by an electrical chain associated therewith, emitting an electrical control signal taking into account the displacements of said control member, the chains are connected to each other by crossed connections and they comprise apparatus for delivering equal signals to said servovalves. The invention is directed to the control of the control surfaces of an aircraft.

Servo-control device for controlling a control surface of an aircraft

The invention relates to a process and device for simultaneously obtaining a plurality of stochastically coded constants, wherein a passive memory is programmed so that the number of logic 1 states of the bits, which belong to the same column of said memory and which correspond to different stored words, divided by the number of said columns, is equal to one of said constants, said memory is addressed by means of a random noise of probability equal to 0.5 and the random sequences of bits are taken from the memory column by column. The invention is applicable to the stochastic processing of information.

Process and device for generating stochastically coded constants

The invention relates to a process for multiplying a stochastic value at the most equal to 0.5, by a number 1+K, with 0<K≦1, which stochastic value is physically represented by a sequence of logic 0 and 1 levels, such that in a certain interval of time, N logic 1 levels appear, according to which process, a first auxiliary sequence is formed from said sequence, comprising KN logic 1 levels, then a second auxiliary sequence comprising N logic 1 levels, each logic 1 level of each of the two auxiliary sequences being on the one hand deducted from a logic 1 level of the initial sequence and on the other hand temporally opposite a zero level of the other auxiliary sequence, after which said auxiliary sequences are added to each other. The invention is more particularly applicable to the stochastic processing of information.

Process and device for multiplying a stochastic value by a coefficient greater than the unit

The present invention relates to a device for transmitting stochastically coded information, comprising a digital multiplexer and demultiplexer connected by a series transmission line and each controlled by addressing means, the addressing means of the multiplexer and the addressing means of the demultiplexer themselves being controlled by a common random noise generator of probability equal to 0.5.

Jean-Pierre Verdier

Papers

Analog noise generator

Servo-control device for controlling a control surface of an aircraft

Process and device for generating stochastically coded constants

Process and device for multiplying a stochastic value by a coefficient greater than the unit

Device for transmitting stochastically coded information