摘要:
A system and method involve transceiving successive first and second synchronization signals defining endpoints of a frame. A digital signal is transceived by a modulating time interval between portions of the first and second synchronization signals. A first data pulse is transceived during the frame. A relative position in the frame of the first data pulse represents a first analog signal.
摘要:
In a traveling state calculating device, a sensing and sending unit senses the number of rotations of a wheel and sends by radio a signal indicative of the sensed number of rotations of the wheel to a calculating and displaying unit to thereby calculate and display the traveling speed and the covered distance. When the traveling state cannot be detected accurately due to interference of radio signals from other devices, the present traveling state calculating device senses the interference, and changes the frequency of the radio signal being used to another frequency to prevent continuation of the interference so as to calculate the traveling state accurately.
摘要:
A method of transmitting at least two measured values by means of light pulses which are passed by an optical transmitter through an optical transmission path to an optical receiver and whose relative separation in time is proportional to the measured value. The energy consumption for the optical transmission of the measured values is reduced by transmitting needle pulses cyclically, one after another in the same order of succession, in that per measured value an optical measuring pulse is transmitted, whose separation in time from the optical measuring pulse associated with a preceding measured value is proportional the magnitude of the measured value, and in that for each group of measured values an optical identification pulse is transmitted, whose distance in time from a preceding measuring pulse is smaller than the smallest possible distance in time between two successive optical measuring pulses.
摘要:
An apparatus for bidirectional data transmission includes a predominantly stationary part with a data line connected to cause a phase shift of an osicllator signal for transmission to a predominantly mobile part. AC signal components of the oscillator signal received by the mobile part are formed into square wave pulses and a difference between high and low states of the pulses is indicative of a phase shift. During the high and low states, positive signal edges of a second oscillation frequency are counted and compared to one another so that predetermined difference causes a status change on a data output line in the mobile part.
摘要:
An apparatus for remote temperature reading particularly for the reading of the temperature of an article or animal at a distance by means of an electromagnetically interrogatable label attached to or implanted in the article or animal the label being constructed to be capable of receiving an electromagnetic signal from a transmitter, converting the signal to a surface acoustic wave, passing the wave over a path on the label, reconverting the surface acoustic wave to an electromagnetic signal and retransmitting it to a receiver. The path of the surface acoustic wave is of a material such that the time of travel of the surface acoustic wave over the path is a function of the temperature of the path and thus of the label. The receiver is constructed to measure the time interval between electromagnetic signals produced by the passage of the surface acoustic wave past a transducer or transducers in the path and thereby provide an output indicative of the temperature of the environment of the label. It is preferred that the label includes a plurality of transducers at coded locations along the path arranged for retransmitting to the receiver a coded sequence of electromagnetic signals indicative of an article or animal to which the label is affixed or in which it is implanted in the manner described in U.S. Pat. No. 3,706,094.
摘要:
A remote control apparatus is constituted by a command encoding device and a command decoding device. In the command encoding device, a timing pulse generator indicates the beginning and end of a time interval of a length which is a function of a command to be encoded, a pulse of the first duration shorter than said time interval is initiated in response to said beginning of the time interval, a pulse of a second duration different from said first duration and shorter than said time interval is initiated in response to said end of the time interval, and said pulses of said first and second duration respectively, are sequentially transmitted in the command decoding device, upon the receipt of a pulse of said first duration followed by a pulse of said second duration, a first indication is produced in response to the receipt of said pulse of the first duration and a second indication is produced in response to the receipt of said pulse of the second duration, and a device provides a value which varies as a function of the length of time between each said second indication which immediately precedes it, whereupon, a command signal is produced as a function of said value.
摘要:
Data sampling apparatus for sampling and storing the values of bits included in a plurality of binary coded signals applied to a corresponding plurality of input data lines. The binary coded signals are sampled repetitively and sequentially by a multiplexer unit and the sampled signals, each having a value of ''''0'''' or ''''1,'''' are applied to and stored in succession in a first plurality of shift registers. The shift registers are arranged to store a set, for example, four, of the most recent sampled signals derived from each of the binary coded signals. The sampled signals are examined at outputs of the shift registers by a mark-to-space detector to detect a set of the most recent sampled signals having particular values (e.g., 1100) indicating that a mark-to-space transition has occurred in a binary coded signal. At such time as this set of sampled signals is detected by the mark-to-space detector, a counter arrangement, including a second plurality of shift registers, is operated to provide successive binary counts at the outputs of the registers for the duration of the bit period following the detection of the aforesaid set of sampled signals. One of these binary counts, for example, a binary count of 15, is taken to represent the center of a bit period following a mark-to-space transition detected by the mark-to-space detector, and another of the binary counts, for example, a binary count of 31, is taken to represent the end of the bit period. Each binary count representing the center of a bit period is detected by a center-of-bit detector at which time a sampled signal representing the value of the bit in the bit period is transferred from the output of a selected one of the first plurality of shift registers to a bit value shift register. Each binary count representing the end of a bit is detected by an end-of-bit detector as a result of which the counting sequence for the bit period is determined and a new counting sequence is initiated for the next bit period.
摘要:
The telemetering system comprises a fixed interrogator-receiver station and at least one moving transponder station. Each transponder haS a ramp generator for producing a linearly rising voltage and threshold discriminators for forming 2n pulses which define in pairs n time intervals representing respectively a reference quantity and n-l measured quantities. A direct current voltage linear integrator in the interrogator-receiver station comes into operation during said n time intervals. At the end of the first time interval a voltage comparator measures the difference between the voltage corresponding to the reference quantity and a local standard reference voltage. During the other n-l time intervals the integrator is controlled by the comparator for the correction of the integrations during said n-l intervals.