225 results about "Transistor–transistor logic" patented technology

The invention discloses Seagate hard disk circuit board detection equipment, which comprises an enclosure, a detection control mainboard, a TTL (transistor-transistor logic) main chip circuit board, one row of four-core hole type interface, a power supply module, an LED display module, a keypad input module and a hard disk state electric indicating lamp group, wherein the detection control mainboard is provided with a central processing unit; the control mainboard is connected with the TTL main chip circuit board by a USB wiring position; the TTL main chip circuit board is connected with one row of four-core hole type interface; the control mainboard is connected with a target Seagate hard disk by an ATA signal interface wire; the power supply module supplies power to the Seagate hard disk circuit board detection equipment and the target Seagate hard disk; the row of four-core hole type interface is connected with the power supply module and the target Seagate hard disk; and the keypad input module, the LED display module and the hard disk state electric indicating lamp group are each connected with the control mainboard. The invention also discloses a Seagate hard disk circuit board detection method which can be used for precisely judging the state of the Seagate hard disk circuit board so as to confirm whether deep maintenance can be carried out to the target Seagate hard disk.

The invention relates to the technical field of range gated imaging, and discloses a picosecond-accuracy narrow-pulse width transistor-transistor logic (TTL) signal acquisition method based on phase shift AND operation. The method comprises the following steps of: dividing each path of TTL pulse triggering signals comprising pulse laser triggering signals and intensified charge coupled device (ICCD) triggering signals in range gating into two paths of time sequence signals with completely identical phase and amplitude by using a multipath generator; delaying one of the divided two paths of signals by adopting a picosecond-accuracy delay line technology to produce a phase shift between the two paths of signals; and then causing the two paths of signals to pass through a logic AND gate for a logic AND operation, thereby compressing a pulse width. By the method, the phase shift between the two paths of signals is accurately controlled to obtain high-accuracy pulse width signals and higher pulse width compression accuracy, and the compressed pulse width can be close to the limit of the TTL signal, namely the order of magnitude of 1ns; and the method is applied in the field of gating application such as range gated three-dimensional imaging, underwater imaging and the like with high-accuracy time sequence requirements.

The invention provides an attitude precision estimation method of multiple high-accuracy inertial navigation systems. According to the method, a set of laser tracker, an attitude measuring head, a signal generator, a swing table or turntable, and a data recording device are used to realize the attitude precision estimation of multiple high-accuracy inertial navigation systems at the same time through initial alignment calibration and synchronous data acquisition, wherein the swing table or turntable is used for providing a dynamic swing environment and can realize pitching, horizontal rolling and longitudinal swing according to a given period and amplitude value, the laser tracker and components matched with the laser tracker can measure three attitude angles of the swing table under a geographical system in real time, the signal generator sends TTL (transistor-transistor-logic) synchronizing level to the laser tracker and the laser inertial navigation systems so as to trigger data output, and the data recording device is used for receiving attitude data sent by the laser tracker and the inertial navigation systems in real time and storing the attitude data into lines. The method is quite suitable for the attitude precision estimation of the laser inertial navigation systems and can be used for estimating the attitude precision of multiple high-accuracy laser inertial navigation systems at the same time by using simplest equipment components.

The embodiment of the invention provides an image processing device and method as well as system. The image processing device comprises an image acquisition card and a FPGA (Field Programmable Gate Array) processor; the image acquisition card comprises a first interface, an image signal conversion module and a second interface, wherein the first interface is used for receiving image signals output by a high-speed camera, the image signal conversion module is used for converting the image signals into parallel TTL (Transistor-Transistor Logic) signals or CMOS (Complementary Metal Oxide Semiconductor) signals from serial LVDS (Low Voltage Differential Signals), and the second interface is used for transmitting the image signals subjected to the signal conversion to the FPGA processor; and the FPGA processor comprises a third interface and an image signal processing module, wherein the third module is used for receiving the image signals which are transmitted by the second interface and are subjected to the signal conversion, and the image signal processing module is used for carrying out parallel processing on the received image signals. The image processing device solves the problem that the prior art is high in cost as multiple devices are adopted for processing the image signals, and simultaneously the image signals are processed in a hardware manner, thereby the reliability of the image signal processing is ensured.

The invention discloses an insulated gate bipolar transistor (IGBT) fault detection circuit which comprises an IGBT damage detection circuit, an IGBT over-current detection circuit, an IGBT overvoltage detection circuit and a signal feedback circuit. Three detection circuits can detect voltage of an IGBT collector electrode - emitting electrode through high flexibility voltage comparers, the voltage is compared with reference voltage set by the voltage comparers, and detection results of all detection circuit can be input into the signal feedback circuit in a transistor-transistor logic (TTL) electrical level mode. When any fault of damage, over current and overvoltage of the IGBT happens, optical fiber light emitting heads in the feedback circuit can all be triggered. The achieved fault feedback signals can be separated and transmitted by optical fibers to be output by a high speed optocoupler. The IGBT fault detection circuit can detect whether the IGBT is damaged in real time, can detect whether over current of the IGBT happens in real time, can detect whether overvoltage of the IGBT happens, and can quickly output fault feedback signals when any fault happens.

The invention discloses a small-sized airborne camera controller. The small-sized airborne camera controller is characterized in that a control instruction enters an instruction decoding circuit through an instruction receiving circuit, the instruction decoding circuit recognizes different control functional codes, then corresponding TTL (Transistor-Transistor Logic) level is written into data I/O (Input/Output) ports of the instruction decoding circuit, wherein one path enters a power source switch driving circuit which completes the on-off control on a camera power source, any two of the other six paths form a group which respectively enters inverse and same-phase input ends of a bilateral level driving circuit to complete the focal length control on a camera; and simultaneously, the TTL level is coded according to a stated frame formal and enters the input end of a control state transmission circuit through an asynchronous serious data transmitting end of a single-chip microcomputer to realize the real time monitoring on the control state of the camera. The small-sized airborne camera controller has the advantages that the circuits are simplified, the volume is reduced, the control state of the camera can be collected in real time, and the remote control and monitoring on the camera is realized.

The invention discloses a range gating based laser imaging synchronous control system. The system comprises a computer software interface, a USB interface, a micro controller, an FPGA (field programmable gate array), a peripheral circuit, a time delay fine tuning circuit, a PCB (printed circuit board) and an operational amplifier, wherein the data sent out from the computer software interface aretransmitted to the micro controller by virtue of the USB interface; the micro controller transmits the frequencies, pulse width parameters of triggering signals of a pulse laser and an ICCD (intensified charge coupled device) and control parameters of delays and mutual delay of the two triggering signals to the FPGA; the FPGA generates two TTL (transistor-transistor logic) signals which are used for triggering the pulse laser and the ICCD and are adjustable (coarse tuning) in frequency, pulse width, delay and interactive delay after receiving the control parameters, the two signals are used for realizing fine tuning on the delays and the interactive delay by virtue of the time delay fine tuning circuit, and finally the pulse laser and the ICCD are triggered. By applying the system in the invention, the aim of flexibly setting imaging parameters can be achieved; and meanwhile, the structure is compact, and the system is convenient to carry and use and has good stability.

The embodiment of the invention provides a redirection method and a redirection device. The redirection method comprises the steps as follows: an access terminal receives a DNS (domain name server) analysis request transmitted by UE (user equipment); the DNS analysis request comprises a web site domain name; the access terminal transmits the DNS analysis response to the UE when not being accessed into an external network; and the DNS analysis response comprises an IP (internet protocol) address and a TTL (transistor-transistor logic) of the access terminal, wherein the IP address of the access terminal is used for directing the UE to a Web management page of the access terminal, so the access terminal is accessed into the external network, and the TTL is used for clearing the corresponding relation between the web site domain name and the IP address of the access terminal before the UE accesses a destination website corresponding to the web site domain name again. According to the technical scheme disclosed by the invention, the problem that a user cannot access the destination website is solved.

The invention provides a television testing method, device and system. The method comprises the following steps: receiving an LVDS (low-voltage differential signal) output by a mainboard to be tested, and converting the LVDS into TTL (Transistor-transistor logic) level to be output; receiving the TTL level, programming according to the information contained in the TTL level, and outputting test data of a general screen; and receiving the test data of the general screen, and converting the test data of the general screen into an LVDS format to be output to the general screen to be used. The invention also provides the television testing device and the television testing system. The television testing method and the television testing device or the television testing system provided by the invention, can reduce the testing cost and improve the testing efficiency.

The invention discloses a miniaturized multi-path two-way signal optical fiber transmission component. The miniaturized multi-path two-way signal optical fiber transmission component comprises a field end and a control end which have multi-chip stack encapsulation structures; the field end is connected with the control end through a transmission optical fiber; the control end can input a plurality of voltage signals and a plurality of data signals, convert a plurality of voltage signals and a plurality of data signals into a positive emitter coupled logic (PECL) signal and transmit the PECL signal to the control end through an optical module and a transmission optical cable; the control end reduces the received PECL signal into a plurality of voltage signals and a plurality of data signals and outputs a plurality of voltage signals and a plurality of data signals; the control end also can input a plurality of transistor-transistor logic (TTL) pulse signals and a plurality of data signals, convert a plurality of TTL pulse signals and a plurality of data signals into the PECL signal, and transmit the PECL signal to the field end through the optical module and the transmission optical cable; the field end reduces the received PECL signal into a plurality of data signals and a plurality of TTL pulse signals and outputs a plurality of data signals and a plurality of TTL pulse signals, so that a plurality of two-way signals are transmitted by an optical fiber, and the anti-jamming capacity is high; and therefore, the miniaturized multi-path two-way signal optical fiber transmission component is particularly suitable for the data transmission of a modern airborne and ship-borne radar system.

The invention relates to a portable type automatic metering calibrating device and method for a guided missile comprehensive test vehicle. The calibrating device comprises a functional signal testing unit, a source signal generation unit and a signal testing function unit, wherein the functional signal testing unit is used for realizing communication between a shot ground and a missile board machine in a testing system and is used for testing a resetting signal and a resetting responding signal of the missile board machine; the source signal generation unit is used for generating a test signal source needed by a test; the signal testing function unit is used for acquiring and testing time intervals of direct-current voltage, alternating-current voltage, standard resistance, a pulse signal and a TTL (Transistor-Transistor Logic) level signal which are generated by the source signal generation unit. According to the calibrating device, the complexity of metering and calibration, previously carried out by manual operation, is solved and the universality and the expandability of the metering calibration of the guided missile comprehensive test vehicle are guaranteed.

The invention discloses a serial asynchronous communication data transmission method, and aims to provide a method which is intuitive and simple in structural model, short in design flow, distinct in procedure level and high in reliability, and can ensure the instantaneity of communication transmission data on communication time series and data frame formats. The serial asynchronous communication data transmission method is implemented through the following technical scheme and comprises the steps of adopting an upper computer micro-control chip as an upper computer for asynchronous serial communication, adopting a lower computer micro-control chip as a lower computer for asynchronous serial communication, and connecting the upper computer and the lower computer through a TTL (Transistor-Transistor Logic)/serial signal conversion circuit to form a serial asynchronous communication data transmission device; arranging serial asynchronous communication data transmission program software formed by a serial data receiving processing module, a serial data transmission module and a timer T module in the upper computer micro-control chip and the lower computer micro-control chip; transmitting serial data frame information to transmit buffers of the upper computer and the lower computer in a time-division way; assigning the real data frame to a buffer array Ai through a receive buffer; storing an array word string consistent to a communication frame protocol into a buffer array Bi.

The invention discloses test equipment, which is used for testing LED (light emitting diode) lamp matrixes. The test equipment comprises a upper computer, a signal conversion device and a signal feedback device, wherein the upper computer is used for generating system control signals, the signal conversion device is connected with the upper computer and is used for receiving the signal control signals from the upper computer and outputting multipath TTL (transistor-transistor logic) level signals according to the system control signals, the multipath TTL level signals are used for testing the LED lamp matrixes, the signal feedback device is connected with the upper computer, and is used for measuring the current value in the LED lamp matrixes and feeding back measuring results to the upper computer, and the upper computer judges whether the LED lamp matrix test is passed or not according the measuring results. The invention also discloses a test method of the test equipment. Through adopting the mode, the test equipment and the test method of the test equipment have the advantages that the test reliability and the accuracy can be improved, and the test efficiency is improved.

The invention discloses a device for switching a universal serial bus (USB) interface and a standard serial port, which belongs to an interface switching device, and the device comprises a main control panel, a programmable logic device, a serial port transform USB module, a front panel USB connector and a power supply detection module; the serial port transform USB module is respectively connected with the front panel USB connector and the programmable logic device; the power supply detection module is respectively connected with the programmable logic device and the front panel USB connector; the programmable logic device is connected with a central processing unit (CPU) module of the main control panel; the device is connected with an external USB interface through the front panel USB connector; the conversion of a transistor-transistor logic (TTL) signal and a USB signal can be realized through the serial port transform USB module; and the programmable logic device detects whether the front panel USB connector is connected with the external USB interface or not through the power supply detection module. The device has the beneficial effects that flexibility for switching the USB interface and the serial port can be realized, the function of a traditional device such as Ethernet passive optical network (EPON) rack equipment can be expanded, and the equipment can be convenient to operate and maintain.

The invention discloses a cache cleaning method based on time prediction and directional acknowledgement for a delay tolerant network. By fusing an active cache cleaning strategy with a passive cache cleaning strategy, the method realizes the efficient cache cleaning of a redundant copy of a data packet in the delay tolerant network. Active cache cleaning cancels an invalid copy by using a TTL (transistor-transistor logic) degradation mechanism. In passive cache cleaning, through leading in a transmission control mechanism based on the time prediction and the directional acknowledgement, the validity of the cache cleaning is improved, the time delay of the cache cleaning is decreased, the consumption of a bandwidth and a storage space caused by the multi-copy transmission of acknowledgement information is reduced, and the quick and efficient cache cleaning is realized. When different delay tolerant network models have different requirements on the service quality of the cache cleaning, the method can obtain better network performance through adjusting a transmission scheme in a directional acknowledging mechanism. The method has high practicality and a wide application range, and promotes the utilization rate of the limited cache in the delay tolerant network.

A wireless self-organizing network fusing routing generation method based on node characteristics comprises the steps that first a source node sends out a communication request to a target node, and communication is directly started if routing information to the target node exists; otherwise, the source node generates a main routing detecting bag and broadcasts the main routing detecting bag to an adjacent node; and a node receiving the main routing detecting bag responds to a detecting message, the target node replies to the message, multiple path information which is not intersected from the source node to the target node is searched, then a main movable node detects and backups the next node, and therefore, the fusing protection routing from the source node to the target node is generated. Compared with the existing routing generation, the generation method achieves the structure of the back-up of the next node and for transmitting the data on the basis of inheriting advantages of the distributed routing algorithm, can ensure that the data can be transmitted continuously under the condition that a linkage or the nodes lose efficacy, avoids flood of control bags in a whole network by introducing a dynamic transistor-transistor logic (TTL) and clock control mechanism, and has the advantages of being simple and convenient to implement and low in algorithm complexity.

Methods are disclosed to describe a portable device that enables the user to navigate the menus of a digital audio player using a set of simple voice commands. The system is comprised of a microcontroller, serial flash memory device, on-board microphone, volume controller, a connector for headphones or external audio amplifier and a connector for an external microphone. Power is supplied by the digital audio device via a connector. The device is loaded with necessary software to interface with the digital audio player using Transistor-Transistor-Logic-level serial commands. The loaded software allows for a search for playlists, artists, albums, genres, or songs, which is accomplished via an extremely low memory ASCII character comparison with sublinear performance functionality.

A method for improving the EMI performance of an LCD device is disclosed, adapting for a point-to-point transistor transistor logic interface of the LCD device. The disclosed method comprises the following steps: receiving a plurality of image data based on a fifth CLK signal; providing a first CLK signal and a second CLK signal to a plurality of source drivers by a timing controller, wherein the frequencies of the first CLK signal and the second CLK signal are smaller than the frequency of the fifth CLK signal, the phase of the first CLK signal is different from the phase of the second CLK signal; and the timing controller transmitting a plurality of first image data to the plurality of source drivers based on the first CLK signal, and the timing controller transmitting a plurality of second image data to the plurality of source drivers based on the second CLK signal.

The invention relates to a video signal conversion technology, and particularly discloses a video conversion device which is used for converting LVDS (Low Voltage Differential Signaling) into video signals of various other types. The video conversion device comprises an A/D (analog-to-digital) conversion unit and a D/A (digital-to-analog) conversion unit. According to the invention, through the A/D conversion unit, the LVDS video signals output by the LVDS video interface of a Menlow platform are converted into transistor-transistor logic level digital signals required by an LCD, and then converted into simulating signals supporting VGA (Video Graphics Array) display through the D/A conversion unit. Through the Menlow platform added in the invention, the double-screen display is flexibly realized; and more than nine display combinations are realized, such as LVDS display, CRT (Cathode Ray Tube) display and TV display which are converted based on LVDS interface of the Menlow platform, as well as VGA display, HDMI (High-Definition Multimedia Interface) display, and TV display which are converted based on SDVO (Serial Digital Video Output).

The invention provides a bootstrap driving circuit. The bootstrap driving circuit comprises a totem pole output circuit, and further comprises a low-pressure-controlled high-pressure MOS (metal oxide semiconductor) pipe circuit and a switching signal circuit which are connected, wherein the low-pressure-controlled high pressure MOS pipe circuit is arranged on the input end of the bootstrap driving circuit, and the switching signal circuit is connected with the totem pole output circuit. The bootstrap driving circuit provided by the invention fully utilizes the conventional discrete element to reduce the circuit cost, input-output interfaces of the circuit are relatively easy to be connected with a MCU (microprogrammed control unit) of a singlechip, a TTL (transistor-transistor logic) device, and the cost is low.

Embodiments of the invention disclose a signal conversion device and method. The signal conversion device comprises an LVDS (Low Voltage Differential Signaling) demodulator, a channel number detection module, a data conversion module and a synchronous check data separation module, wherein the LVDS demodulator is used for receiving and demodulating LVDS signals output by a plurality of channels of an LVDS interface; the channel number detection module is used for taking one channel provided with an effective LVDS signal after demodulation as the reference channel, carrying out comparison on the LVDS signals of the remaining channels except for a reference channel after demodulation and the LVDS signal of the reference channel, judging the channels provided with the effective LVDS signals in the remaining channels, and outputting a channel number indication signal; the data conversion module is used for converting the effective LVDS signals in the corresponding channels provided with effective LVDS signals into one way of parallel TTL (Transistor-Transistor Logic) signals; and the synchronous check data separation module is used for carrying out signal separation processing on one way of parallel TTL signals. According to the signal conversion device and method, the number of the LVDS channels can be automatically recognized, and the device and the method have the advantages of simplicity in operation, high efficiency and low cost.

The invention discloses a lighting control device for realizing the transmission of a DALI (digital addressable lighting interface) bus protocol through ZigBee, which comprises a DALI joint, a DALI bus transceiver unit, a FLASH-containing microcontroller, a ZigBee wireless transceiver module, a 2.4 G antenna and a power module, wherein the DALI joint is used for outputting DALI bus control signals, the DALI bus transceiver unit is used for carrying out mutual conversion on a TTL (transistor-transistor logic) level and a DALI difference level, the ZigBee wireless transceiver module is used for carrying out ZigBee wireless data transmission, the DALI joint, the DALI bus transceiver unit, the microcontroller, the ZigBee wireless transceiver module and the 2.4 G antenna are sequentially connected, and the power module is simultaneously connected with the DALI bus transceiver unit, the microcontroller and the ZigBee wireless transceiver module. The lighting control device disclosed by the invention not only has a wireless ZigBee receiving function, but also can carry out addressing on lighting equipment according to the DALI bus protocol, and control the lighting state of the lighting equipment, therefore, the lighting control device can effectively meet the large-scale, high-scalability requirements of intelligent lighting control systems.