277 results about "Manchester code" patented technology

A data communication system comprises a transmission line between first and second integrated circuits. An encoder on the first integrated circuit encodes an input data stream to produce a sequence of codewords, wherein codewords in the sequence are members of a set of codewords representing data in the input data stream, and the members of the set are substantially DC balanced, such as a Manchester encoded symbol set. An integrating circuit on the second integrated circuit integrates codewords by integrating for a first interval with a positive polarity within a particular symbol cell, and integrating for a second interval with a negative polarity within the particular symbol cell, to produce output representing the codewords. A sense circuit produces an output data stream.

A device for seamlessly providing 10BASE-T compatible data communications over an ordinary single twisted-pair home phone line between multiple computers and / or peripherals is disclosed. Each component that is to communicate over a home phone line needs a 10BASE-T compatible network interface card (NIC) for interfacing with the device. A transmit / receive switch is used to switch the device between a transmit mode and a receive mode. When a signal is being transmitted from a component, a Manchester decoder converts the signals received from the NIC into a raw data stream. A differential converter converts the raw data signal received from the NIC to a differential signal. A modulator is used to modulate the signal to a RF signal using a PSK, QPSK, QAM, MCM or similar modulation schemes. A filter is used to limit the bandwidth of the modulated signal and a driver is used to amplify the signal to match the impedance of the phone line. When the device receives a signal over the phone line, the signal is filtered using a bandpass filter and then amplified. The signal is then demodulated using an appropriate demodulation scheme before being differentially encoded. A Manchester encoder encodes the received signal for compatible operation with a receiving NIC.

The present invention provides a network controller that directs communications with a variety of remote devices via a common bus. The network controller includes a transmitter for transmitting messages via the common bus, and a receiver for receiving messages from the common bus. Additionally, the network controller includes a clock for providing clock signals to both the transmitter and receiver. The transmitter and receiver are selected such that the network controller is capable of selectively operating in either synchronous or asynchronous mode. In operation, the network controller is configured in either a Manchester encoding or a Universal Asynchronous Receiver Transmitter (UART) protocol. The transmitter transmits messages comprising a command and an address of at least one remote device. In one embodiment, the transmitter simultaneously transmits messages to a plurality of remote devices in accordance with a group address comprised of a multiple bits with each bit associated with a respective group.

A power source and control system is particularly suited for use in an outdoor landscape lighting system. The power source and control system includes at least one switching mode AC-to-DC power supply having an additional output stage for efficiently converting the DC output signal into another relatively low frequency AC signal for transmission to a plurality of buried power conductors. A Manchester encoded control signal is encoded at a relatively high frequency onto the AC signal sent over the buried power conductors so that intelligent LED lighting fixtures can be powered by the AC signal and selectively have their intensity changed when they decode the control signal.

A card reader has a read head positioned in the housing. The read head is configured to be coupled to a mobile device. The read head has a slot for swiping a magnetic stripe of a card. The read head reads data on the magnetic stripe and produces a raw magnetic signal indicative of data stored on the magnetic stripe. Device electronics are provided that include a microcontroller. The device electronics receives a raw magnetic head signal and converts it into a processed digital signal that the microcontroller can interpret. The microcontroller produces a synchronous Manchester encoded stream that makes a greater number of 0 crossings. An output jack is adapted to be inserted in a port of the mobile device and deliver a Manchester encoded stream output jack signal to the mobile device.

A method is provided of transmitting information with a communication protocol to a mobile device. A card reader is provided with a read head that has a slot for swiping a magnetic stripe of a card, an output jack and device electronics that includes a microcontroller. The read head is used to read data on a magnetic stripe of a card. A raw magnetic signal is produced indicative of data stored on the magnetic stripe. The raw magnetic head signal is converted into a processed digital signal that the microcontroller can interpret. A synchronous Manchester encoded stream is produced that makes a greater number of 0 crossings. A Manchester encoded stream output jack signal is delivered to the mobile device through the output jack.

A position sensor encodes absolute position via n consecutive members of a pseudorandom sequence of bits, where each bit (30a-30k) comprises a region of high transmission or reflectivity adjacent to a region of low transmission or reflectivity. The pseudorandom sequence is chosen such that every series of n consecutive bits (30a-30k) in the sequence is predominantly formed from a predetermined bit value (1 or 0). The light transmitted or reflected from the series is therefore detected as a substantially periodic intensity pattern (42), which can be processed via Fourier analysis to yield an accurate interpolation of relative position. An example is given of a pseudorandom sequence, which can be represented as a cyclic Manchester code, in which at least 8 members of every series of 11 consecutive bits has a bit value of 1.

Disclosed are a vehicle remote control start system and a method thereof for remotely controlling start of vehicles. The vehicle remote control start system comprises a remote control transmitter, an engine control module, a vehicle anti-theft module and a remote control starting module, wherein the remote control starting module receives signals from the remote control transmitter and is communicated with the engine control module through Manchester encoding. The method comprises a first detecting step, a power supplying step, a second detecting step, a feedback step, a running control step and a third detecting step. The vehicle remote control start system has perfect functions and can improve driving comfort well. The method can monitor states of the vehicle and the engine in real timeand determine whether performing remote control start or not according to the detected state, and has sound protection and anti-theft functions.

The invention discloses a high-power downhole electromagnetic pulse transmission device which comprises a ground instrument and a downhole instrument. The core of the ground instrument is an industrial personal computer and consists of a depth / magnetic mark / global position system (GPS) signal recording module, a Manchester coding and decoding module and a cable driving module; the depth / magnetic mark / GPS signal recording module and the Manchester coding and decoding module are connected with the industrial personal computer respectively through two serial ports; based on the principle of phantom power supply, the cable driving module is connected with the downhole instrument by a cable; the downhole instrument is sequentially provided with an alternating-current boost module, an energy-storage capacitor, a transmitting coil, a data acquisition module, a high-voltage discharging switch and a controller manipulated by a computer; and the ground instrument supplies power to the downhole instrument through the cable. By the high-power downhole electromagnetic pulse transmission device, magnetic field pulse excitation with instantaneous high power can be realized in a cased well, full time-interval data during transmitting wave forms and receiving signals in a well is recorded, and an observation system is provided for a downhole electromagnetic detection method which is used for evaluating and developing the distribution state of remaining oil in an oil storage layer.

A decoder that receives a Manchester encoded signal including a start of frame sequence followed by coded data values followed by an end of frame sequence. The decoder also includes a detector that detects the start of frame sequence and the end of frame sequence to determine a beginning and end of the coded data values in the Manchester encoded frame. The decoder includes an integrator with hysteresis that includes an up-down counter and provides an output signal responsive to upper and lower threshold values. The output signal is applied to a discriminator that includes a counter which counts up in response to one value of the output signal of the integrator and is reset in response to the other value of the output signal of the integrator.

The invention provides a control system, valve base control equipment and a submodule integration method. Valve base control equipment consists of two symmetric screen cabinets, wherein each screen cabinet is provided with a power supply unit, a current control unit and a bridge arm control unit; and controllers of the valve base control equipment, a control system and a submodule are connected with one another through optical fibers. All communication interfaces are in a CRC (Cyclic Redundancy Check) check based optical fiber serial communication mode of a reverse Manchester encoding form, so that data throughput is greatly increased, system control time delay is reduced, and real-time control and protection functions of a modularized multi-level flexible direct current valve can be finished. In the method, a hardware structure of the current control unit and the bridge arm control unit is adopted, so that system-level current balance control and valve-level capacitive voltage balance control are clearly divided, and the requirements for modularized multi-level real-time control are met.

A signal processing apparatus, which executing a decoding process for a digital signal Manchester-encoded by assigning two bits of “10” to any one of binary digital signals “0 and “1”, and assigning two bits of “01” to the other binary digital signal, is provide with a decoding unit which executes the decoding process with a processing unit corresponding to a tern of two bits of the Manchester-encoded digital signal so as to detect only any one of the first bit and the second bit of the Manchester-encoded digital signal.

A method and a corresponding decoder for decoding a Manchester encoded binary data signal includes receiving the Manchester encoded binary data signal having a first sequence of central bit transitions and a second sequence of initial bit transitions. A local clock signal is generated, and the central bit transitions of the Manchester encoded binary data signal are determined. Determination of the central bit transitions includes measuring the time interval elapsing between a pair adjacent central bit transitions, expressed as a number N of cycles of the local clock signal, and selecting each successive central bit transition based upon the time interval N measured between the pair of central bit transitions which immediately precede the successive central bit transition.

A mobile phone terminal device checks, in a Manchester determiner, whether or not demodulated data satisfies a predetermined condition for decision exploiting a feature proper to the Manchester code. The Manchester determiner generates a decision signal representing the state of allowance or inhibition, conforming to the decision, and, responsive to the state of allowance of the decision signal. The Manchester determiner allows the demodulated data stored in a buffer to be output. The decision signal is transferred from the determiner to a radio frequency unit and a demodulator. The operation of the radio frequency unit and the demodulator is halted responsive to the state of inhibition of the decision signal.

A method of transmitting and rapidly recovering a burst of data without first having to establish a timing or phase lock. The signals are transmitted as modified Manchester coded signals having pulse transitions at a clocking pulse rate which is a multiple of the clocking pulse rate at which the signals are originally generated, and wherein the MOOSE coded signal is modified by ON-OFF keying.

Systems and methods that utilize a received signal to provide low cost, low power, high sensitivity radio frequency hopping communication. A transmitting system prepares a data packet that is to be communicated to a receiving system. The data packet includes a header, a network identification, and transmission data. A transmission frequency is identified and a phase lock loop (“PLL”) is set to the transmission frequency. The data packet is gathered, and frequency modulation and Differential Manchester encoding is performed. The signal is sent through a power amplifier and an antenna to a receiving system, which continually scans all channels of a frequency range for a valid signal. When a pulse is received, the signal is passed through a low noise amplifier, mixed down to 10.7 MHz, passed through one or more filters and one or more high gain amplifiers, mixed down to baseband, sent through a low pass filter, and then sent through a comparator. If an appropriate pulse width, expected bit pattern and a valid header are received, it is determined that the signal is valid and the entire data packet is demodulated to receive the transmitted data.

The invention discloses a Manchester decoding device capable of carrying out error correction and a method thereof. The device comprises a clock frequency divider module, a multipoint sampling module, a jump edge detection module and a decoding module. The clock frequency divider module carries out frequency division processing on a clock signal of an input apparatus and outputs the clock signal after the frequency division processing to the multipoint sampling module. The multipoint sampling module carries out multi-point sampling on a Manchester code element and outputs a sampling result to the decoding module. The jump edge detection module detects a level jump edge of each input Manchester code element and the level jump edge is taken as a reference signal of the multipoint sampling module. The decoding module carries out decoding according to a sampling result of the multipoint sampling module. A traditional Manchester decoding device based on a single point sampling method has the following technical problems that an error correction capability is poor; working is not stable; the device is easy to be interfered and reliability is not high. By using the device and the method of the invention, the above problems are well solved.

A position sensor encodes absolute position via n consecutive members of a pseudorandom sequence of bits, where each bit (30a-30k) comprises a region of high transmission or reflectivity adjacent to a region of low transmission or reflectivity. The pseudorandom sequence is chosen such that every series of n consecutive bits (30a-30k) in the sequence is predominantly formed from a predetermined bit value (1 or 0). The light transmitted or reflected from the series is therefore detected as a substantially periodic intensity pattern (42), which can be processed via Fourier analysis to yield an accurate interpolation of relative position. An example is given of a pseudorandom sequence, which can be represented as a cyclic Manchester code, in which at least 8 members of every series of 11 consecutive bits has a bit value of 1.

The invention discloses a true random number generator with a digital post-processing circuit, which comprises a true random number source and a true random number output register. The true random number generator is characterized in that the digital post-processing circuit is connected between the true random number source and the true random number output register, wherein the digital post-processing circuit comprises a Manchester encoder, a linear feedback shift register and a DES (data encryption standard) encryption unit which are connected from the true random number source to the true random number output register; the true random number output register is used for latching the ciphertext output by the DES encryption unit; and finally, the true random number is output to a chip by the true random number output register. The true random number generator improves the quality of random number sequences generated by the true random number source; the finally output random number sequences have the characteristics of good uniformity and high independence; the security for information storage of the cryptographic chip is improved; and the true random number generator has higher actual application value in the aspects of cryptographic chip, information security and the like.

In a touch panel system of the present invention, a touch pen is configured of an electronic pen that signals can be input into and output from. A touch panel controller includes a synchronization signal transmission unit that transmits a synchronization signal to the electronic pen during synchronization signal transmission periods immediately before each of a first signal line drive period and a second signal line drive period. The synchronization signal transmission unit transmits the synchronization signal of which the waveform is configured of a Manchester-coded pseudorandom sequence having periodicity to the electronic pen during the synchronization signal transmission period. The electronic pen includes a synchronization signal detecting unit that detects the synchronization signal.

The disclosed decoding method for Manchester code comprises: the first SCM organizes the data into a data frame with the lead code, the synchronization code and check code; before decoding, the second SCM decodes the lead code wirelessly before the synchronization code by means of interrupt method and then decides whether the lead code right; if yes, the second SCM samples the data port, or continues to monitor and receive signal combined a timing technique or else continues to monitor signal. This invention improves sensitivity and validation, reduces cost, and has wide application.

The invention provides a special wired train bus control device, which is characterized in that: a link layer interface comprises a transmitting buffer and a receiving buffer; a link layer comprises an HDLC frame transmitter unit and an HDLC frame receiver unit; and a physical layer comprises a control module, a channel management module, a Manchester coding and decoding module, a timer, an interrupter and a register. The special wired train bus control device provided by the invention has high generality.

A device is provided that creates pulse signals for UWB with a simplified circuit and performs radio transmission / reception in ultrawideband. The signal processor converts transmission data into a transmission baseband and then transmits it to the Manchester converter circuit. The Manchester converter circuit creates Manchester codes, which are converted from an L level to an H level with bit data [1] of transmission data, or from an H level to an L level with bit data [0] of transmission data. The Manchester converter circuit drives the monopulse generator circuit, using the output monopulse. The monopulse generator circuit includes series resonator circuit, produces a monopulse signal of transient response, which converts from positive to negative or from negative to positive, in response to the edge of the pulse. The enable control circuit selects a monopulse signal to be transmitted and then transmits as an UWB transmission signal the monopulse signal modulated based on the bit data [1], [0], from the antenna A.

The invention discloses a 1553B bus program control fault injection device. The 1553B bus program control fault injection device comprises a Manchester coder, an odd check fault coder, a synchronous head fault coder, a zero passage fault coder, a data word length fault coder, a message length fault and replacing command fault coder, a data interval fault coder and a response delay fault coder. The 1553B bus program control fault injection device is used for verifying effectiveness, reliability and testability of 1553B bus communication equipment and a 1553B bus communication system, solves the defect and problem that a bus communication process is damaged in a 1553B bus fault injection test process by the traditional method, is realized by adopting an FPGA (field programmable gate array) firmware and has universality. An input end is connected with a 1553B bus control IP (internet protocol) core or chip, various faults are generated by changing a coding mode, and the communication function of the 1553B bus control IP core or chip is not intervened. Other sources such as a phase locking ring and a storage are not called and the hardware expense is small.

The invention discloses an LED light control bus and a control method thereof; the bus comprises a plurality of nodes and communication cables connected among each node; the communication cable at least comprises a signal wire; the node comprises a bus dispatching terminal; the signal wire is a pair of twisted pair cable for signal transmission between nodes; the signal is baseband data of Manchester encoding, which comprises clocked signals and data signals and is used for transmitting a clock synchronization signal simultaneously with code information. The control method comprises receiving and transmitting nameplates; inspecting correctness of a check sum; if the check is not passed, data are abandoned and the last step is returned; if the check is passed, received protocol number is judged: if the protocol number is zero, illumination data processing is executed; if the protocol number is equal to one, an address processing is set; is the protocol number is equal to Oxff, any processing is not done. The LED light control bus and a control method thereof can have 100 meters of communication distance between nodes; communication speed can reach 10Mbps; data serial transmission has no phase shift and no need of addressing in advance.

The invention discloses a two-channel signal transmitting method for LED driving chips. The method supports two-channel single-line signal transmission with an input channel 1 with the higher transmission priority, in the signal transmitting process, all the chips generate a synchronous sampling clock according to received single-line signals, and then the single-line signals are locally decoded; after a certain bit number of data signals are received, the chips start to utilize internal clocks to fast recover the single-line signals according to the encoding mode of the Manchester code and transmit the single-line signals to the next-level chip; meanwhile, a protocol recognition module controls a display output module according to data obtained through local decoding, and therefore display output can be achieved. The two-channel signal transmitting method can meet high-reliability, high-speed and long-stance single-line signal transmission requirement, and infinite cascading of the LED driving chips can be achieved.

The invention discloses a remotely updating device of an EDIB (Electronic Data Interchange Bus) based down-hole program. In a ground logging system, an updating program is compiled as a target file of .out by CCS (Compiling Program Software); in a program processing module, the program is analyzed and extracted to be changed into hexadecimal data and then is encapsulated; in a data transmission module, Manchester encoding is performed, a differential signal outputted after encoding is driven, isolated, coupled and outputted to the EDIB. In a down-hole apparatus, the differential signal on the EDIB is coupled, linearly received and reshaped in a data receiving module, and outputted to FPGA (Field Programmable Gate Array) for Manchester encoding so as to restore the hexadecimal encapsulated data; a program updating module extracts the hexadecimal data from the hexadecimal encapsulated data, restores the hexadecimal data as an object code capable of being identified by DSP BootLoader and then writes the restored hexadecimal data in a program storage via a programming library function so as to update the program of a down-hole apparatus. Without influencing on the normal logging work, the ground system and the down-hole apparatus are reconstructed to improve the logging efficiency.

The invention discloses a decoding circuit of Manchester encoding of a Tamagawa encoder which employs a programmable logic device to realize the decoding circuit of Manchester encoding of the Tamagawa encoder. The programmable logic device at least comprises a synchronization head detection unit, an enable signal generation unit, a decoding unit of Manchester code, a synchronous clock extraction unit, a series-parallel conversion unit, a CRC calibration unit, a data register group unit and a parallel interface unit. The decoding circuit provided by the invention can replace the existing special conversion chip, and employs the programmable logic device to realize the processing like decoding, series-parallel conversion, CRC calibration, data separationand the like of Manchester encoding of the Tamagawa encoder and is characterized by flexible design, high reliability strong practicabilityand the like. The circuit can be used in communication technology, signal processing, servo control and other fields, realizes detection and processing of the Tamagawa encoder signal, and has a great practical application value.

The invention discloses an enhanced quad-tree anti-collision algorithm suitable for an RFID (Radio Frequency Identification) system. The algorithm comprises the steps of initializing a query stack; detecting collision bits; determining a query prefix; pressing the query prefix into the stack; and judging the query stack. According to the algorithm, the collision bits of tags are accurately located by utilizing Manchester codes firstly, and the collision bits of the tags with the lengths of j bits are extracted to form IDs of new k-bit tags, so that the transmission of useless bits is greatly reduced; and all the collision bits of the tags are connected together, identification is performed by adopting a dynamic quad-tree, a reader sends an XOR operation command to the tags, and the query prefix is re-determined according to information returned by the tags, so that a free timeslot number and a query frequency of the reader are reduced, the throughput rate is increased, and the system identification efficiency is improved.

The invention relates to a computer board card of a CPCI (Compact Peripheral Component Interconnect) framework, in particular to a standard bus interface module based on a MIL-STD-1553B protocol, namely, a plane internal time-division system command / response multipath transmission data bus interface module, which is widely applied to plane comprehensive avionics systems and external store management and integration systems, and gradually expands to plane control systems and the like as well as the fields of tanks, ships, spaceflight and the like. The MIL-STD-1553B protocol is realized through an FPGA (Field Programmable Gata Array); coding and decoding of a Manchester code are realized by using a VHDL (Hardware Description Language); a reasonable small-sized bus driving circuit is designed according to the MIL-STD-1553B protocol; a DSP (Digital Signal Processor) program which can support the protocol is written, and an assembled interface assembly function is realized. Due to the adoption of the interface board card, the design requirement of small size is met, functional expansion can be performed easily as required, using flexibility is realized, and the development cost of a product is much lower than that of a foreign special interface chip.