3690 results about "Digital conversion" patented technology

The invention relates to a safety monitoring early warning and safety management system of oil and gas extraction and gathering operations as well as a method thereof, belonging to the technique field of safety production monitoring and supervision, and the system is composed of a monitoring center arranged at an oil and gas extraction safety monitoring and management department and a plurality of on-site monitoring terminals disposed at all oil and gas extraction operation areas. The method comprises: collecting and transmitting safety-related parameter signals, video signals and audio signals in real time; implementing the analog-digital conversion or signal conversion and compression coding to the signals; then transmitting the signals to all hosts of the monitoring center; processing and analyzing the received three types of signal information by all the hosts and then carrying out the parameter monitoring, video monitoring and audio communication respectively; and outputting the processed three types of information to the spot for being controlled correspondingly. The invention can realize the risk assessment, dynamic intelligent monitoring, safety state analysis, accident early warning and alarming, safety guarantee control and safety management of the whole process of operations ranging from oil and gas extraction, heating, separation processing, storage to transportation for oil and gas production enterprises.

Disclosed herein is a solid-state imaging element including a pixel unit configured to include a plurality of pixels arranged in a matrix and a pixel signal readout unit configured to include an analog-digital conversion unit that carries out analog-digital conversion of a pixel signal read out from the pixel unit. Each one of the pixels in the pixel unit includes a plurality of divided pixels arising from division into regions different from each other in optical sensitivity or a charge accumulation amount. The pixel signal readout unit reads out divided-pixel signals of the divided pixels in the pixel. The analog-digital conversion unit carries out analog-digital conversion of the divided-pixel signals that are read out and adds the divided-pixel signals to each other to obtain a pixel signal of one pixel.

A FM-CW radar system comprises a frequency modulated continuous wave digital generator that produces both in-phase (I) and quadrature-phase (Q) outputs to orthogonally oriented transmitter antennas. A linearly polarized beam is output from a switched antenna array that allows a variety of I-and-Q pairs of bowtie antennas to be alternately connected to the transmitter and receiver. The receiver inputs I-and-Q signals from another bowtie antenna in the array and mixes these with samples from the transmitter. Such synchronous detection produces I-and-Q beat frequency products that are sampled by dual analog-to-digital converters (ADC's). The digital samples receive four kinds of compensation, including frequency-and-phase, wiring delay, and fast Fourier transform (FFT). The compensated samples are then digitally converted by an FFT-unit into time-domain signals. Such can then be processed conventionally for range information to the target that has returned the FM-CW echo signal.

The invention discloses a pipe leakage detecting system, comprising a controller and a pipe leak detector, wherein, the controller processes and store data in the pipe leak detector through a wireless technology; the pipe leak detector also comprises a sensor, an amplifier, an analog-digital conversion module, a main processor, a GPS clock synchronization control module, a wireless communication module and a power supply module, wherein, the sensor is arranged on a pipe to be detected; the amplifier is connected with the sensor; the analog-digital conversion module is connected with the amplifier; the main processor is connected with the analog-digital conversion module; the GPS clock synchronization control module is connected with the main processor; the wireless communication module is connected with the main processor; and the power supply module is connected with the main processor. In the invention, sensors are arranged on the outer wall of the pipe at intervals and receive sound waves produced by leakage points on the pipe under the condition that GPS time service error is less than 200nS, thereby realizing high sensitive detection of the pipe leakage and high precise positioning of leakage sources. In addition, the pipe leakage detecting system is characterized by low cost, small volume, light weight, being portable and convenient operation.

There is provided a filter circuit for producing a noise reduction signal for reducing a noise signal collected by a microphone, including: a digital section including an analog/digital conversion section configured to convert the noise signal into a digital noise signal, a digital filter section configured to produce a digital noise reduction signal based on the digital noise signal, and a digital/analog conversion section configured to convert the digital noise reduction signal into an analog noise reduction signal; an analog path connected in parallel to said digital section and configured to output the noise signal as it is or after processed by an analog filter; and a synthesis section configured to synthesize the analog noise reduction signal outputted from said digital/analog conversion section of said digital section and the analog signal outputted from said analog path to produce a noise reduction signal to be used for noise reduction.

It is made possible that, in accordance with a plurality of radiographing modes such as the still image radiographing mode and the moving image radiographing mode, the outputs both in the irradiation period and in the non-irradiation period are made to fall within the dynamic range of the radiographing system, whereby an accurate, high-S/N-ratio X-ray radiographic image is obtained. For that purpose, in accordance with the plurality of radiographing modes, an arithmetic operation unit adjusts a power source to control voltage to be applied to a reading circuit unit or an Analogue-Digital conversion unit, such that, in each of the radiographing modes, both an electric signal in the X-ray irradiation period and an electric signal in the X-ray non-irradiation period fall within the dynamic ranges of the reading circuit unit and the Analogue-Digital conversion unit.

A physical quantity distribution detecting apparatus includes a sensor array in which a plurality of unit sensors for sensing physical quantity are two-dimensionally arranged in a matrix; and an analog-to-digital conversion unit that includes a plurality of comparators for comparing an analog signal read from the unit sensor with a reference signal, the analog-to-digital conversion unit converting a digital signal by measuring a period of time or measuring a signal corresponding to the period of time of each comparison output of the plurality of comparators. Each of the plurality of comparators includes at least one capacitor element connected between a signal line and a constant-voltage line.

The invention discloses a sleep period separating method and system. The method is applied to a sleep period separating system. The system comprises a first measuring electrode, a second measuring electrode, a first reference electrode, a second reference electrode, an amplification collector and a period separating device. The first measuring electrode is used for being placed on the left side of the forehead or the temporal hair-free region on the left side of a testee, the second measuring electrode is used for being placed on the right side of the forehead or the temporal hair-free region on the right side of the testee, the first reference electrode is used for being placed on the periphery of the left ear of the testee, and the second reference electrode is used for being placed on the periphery of the right ear of the testee. The method comprises the steps that the first measuring electrode and the second measuring electrode are utilized for collecting electroencephalogram signals and electro-oculogram signals of the testee, the signal amplification collector is used for amplifying the electroencephalogram signals and the electro-oculogram signals and carrying out analog-digital conversion on the amplified signals. The period separating device determines the separated sleep periods according to the analog-digital converted electroencephalogram signals and electro-oculogram signals.

The invention discloses an integrative electric energy quality monitoring terminal, comprising a hardware part, a monitoring sensor circuit and a software judging part, wherein the monitoring sensor circuit is used for sending detection signals to an A/D analog-digital conversion module by the design of the hardware part; the A/D analog-digital conversion module is used for sending processed information to a processor; the processor is used for feeding back the information to a display module and receiving a command from a control module; the processor is also provided with a real-time clock module and externally provided with a communication interface, and the information processing standard can be directly set by a switching value input/output module which is directly connected with a central processor.

A method for transmitting orthogonal frequency division multiplexing (OFDM) signals including coding the OFDM signals; forming a block of N coded data and dividing the block into L M-sized small blocks; M-point inverse fast Fourier transforming the L small blocks; combining the transformed blocks to generate an N-sized inversely-transformed block; attaching a cyclic prefix to the N-sized block; and transforming the blocks into an analog signal; and transmitting the analog signal. A method of receiving OFDM signals including digitally converting received OFDM signals and obtaining a samples from the transformed signals; detecting the starting point of an N-sized signal sample block from the samples; dividing the signal sample block into L M-sized small blocks M-point fast Fourier transforming the L small blocks; combining the transformed small blocks to generate an N-sized transform block; detecting data from the generated block, and decoding the detected data. N, M and L are integers of 1 or more and L=N/M.

The invention discloses a method and a device for full balance control of a power battery of an electric automobile. In the method, an analog-digital conversion module of a microcontroller is used for acquiring single body voltage parameters of the power battery and sequencing the single body voltage parameters of the power battery; the microcontroller is connected with a battery management system to acquire dump energy information and battery balancing threshold of the current battery management system; and the method for the full balance control of the power battery of the electric automobile is implemented by the microcontroller according to the actual condition of the dump energy, or selecting an active balancing mode of starting an active balance control circuit and using an on-vehicle battery to charge the lowest battery single body, or selecting a passive balancing mode of starting a passive balance control circuit and using a balancing resistor to discharge the highest batterysingle body, or selecting a mixed balancing mode of using the two modes at the same time. By using the method and the device, a reasonable balancing strategy is established according to the dump energy of the battery, so that the problem of inconsistency of charge and discharge of the power battery is effectively solved and unnecessary electric energy consumption in balancing is effectively reduced.

A detector (22) detects an event. First and second time-to-digital converters(TDCs) (70, 72) generate first and second time stamps (TS1, TS2) for the detection of the event. The first TDC and the second TDC are both synchronized with a common clock signal (62) that defines a fixed time offset between the second TDC and the first TDC. An autocalibration circuit (120) adjusts the first TDC and the second TDC to keep the time difference between the second time stamp and the first time stamp equal to the fixed time offset between the second TDC and the first TDC. The detector may be a detector array, and trigger circuitry (28) propagates a trigger signal from a triggering detector of the array of detectors to the first and second TDC's. Skew correction circuitry (132, 134, 136, 142, 60, 162) adjusts a timestamp (TS) based on which detector is the triggering detector.

The invention discloses a method and a device for detecting power battery insulation resistance of an electric automobile. Two circuits of universal input/output interfaces of a micro-controller are respectively and externally connected with positive and negative insulation switch circuits. Positive and negative insulation switch relays are gated. Insulation resistance sampling voltage is output. The sampling voltage is amplified by an operational amplifying circuit, isolated by a voltage isolation chip and input in an analogue-digital conversion unit of the micro-controller. An insulation resistance value of a current power battery is calculated by the micro-controller according to an algorithm, transmitted to a battery management system through a communication module in the form of message and used by the battery management system. According to the method and the device disclosed by the invention, the problem that positive leakage, positive leakage or positive and positive leakage cannot be judged by the traditional insulation resistance detection device is effectively solved; the leakage degree of the current power battery can be precisely measured; and potential safety hazards resulted from inaccuracy of the insulation resistance are stopped.

Said invention refers to method for filtering noises of touch control screen. It contains finding out mean value after detecting positional information, comparing above-mentioned positional information and mean value, calculating difference, outputting final position message.

Systems and methods are disclosed that employ a programmable analog-to-programmable digital converted system. A programmable analog-to-digital converter system comprises a quantizer assembly and configuration control. The quantizer assembly is configurable to provide at least one quantization stage. A given quantization stage converts an associated analog signal into an associated digital output signal. The configuration control selects among a plurality of configurations and configures the analog-to-digital converter system according to the selected configuration. The quantizer assembly is configurable to provide a plurality of quantization stages arranged in series in a first configuration, or to provide a single quantization stage in a second configuration.

A temperature to digital converter device is implemented by integrating a temperature sensor circuit into an analog-to-digital converter (ADC). Temperature-to-digital conversion is accomplished by first measuring a change in voltage (ΔV_BE) across the junction of a diode when different current densities are forced through the junction. The thus obtained ΔV_BE is proportional to temperature. As part of the conversion processing, ΔV_BE is multiplied by a fixed gain, and an offset voltage value is subtracted from ΔV_BE. The multiplication and subtraction functions are performed by a switched-capacitor integrator in a delta-sigma ADC and the ADC itself operates as the temperature-to-digital converter device, eliminating the extra amplifier and/or capacitors required when the multiplication and/or subtraction function are performed outside the ADC. Alternately, other ADC topologies that include an integrator or gain amplifier, such as pipeline ADCs and cyclic ADCs may be used in place of the delta-sigma ADC.

The invention discloses a data encryption method, a data encryption device, a data decryption method and a data decryption device. The method comprises the following steps: obtaining sensitive data, and judging that the data type of the sensitive data belongs to a character type or a numeric type; if the data type of the sensitive data belongs to the character type, extracting single original characters in the sensitive data, and converting the single original characters into encryption characters in an encryption character set so that the sensitive data are converted into encryption data; if the data type of the sensitive data belongs to the numeric type, converting later N original numbers in the sensitive data into N encryption numbers so that the sensitive data are converted into the encryption data. The data are encrypted by retaining the manner of original data, so that the required storage space of the encryption data in a data storage system is not changed, and the system overhead and communication overhead of a traditional encryption algorithm are reduced.

An analog input signal obtained from an analog sensor group 104A and first and second calibration voltages obtained by high-precision voltage-dividing resistors are successively selected by a multiplexer, digitally converted through an AD converter and then input to a microprocessor. The microprocessor calculates a collinear approximate coefficient based on the first and second calibration voltages in cooperation with a program memory, and corrects the digital conversion value to the analog input signal by using the approximate coefficient, thereby correcting a linear error of the conversion characteristic of the AD converter. In the calculation of the approximate coefficient, upper and lower limit check is executed on measurement values and calculation coefficients, and also plural calculation results are averaged to enhance the precision.

Provided is a power battery SOC estimation method based on backward difference discrete model and a system thereof; the method comprises the following steps: step one, establishing a backward difference discrete model of a power battery, identifying parameters of the backward difference discrete model by a least square method including forgetting factors; step two, on the basis of the backward difference discrete model of the power battery obtained in step one, using self-adaptive extended Kalman filter in combination with a non-linear relationship between an open-circuit voltage and the SOC to complete an effective estimation of the power battery SOC. In the system, voltage and current sensors connected with the power battery are connected with an embedded microcontroller via an analog-digital conversion module. The microcontroller comprises a low-pass filter pre-processing module, a backward difference discrete battery model parameter online identification module, and an AEKF algorithm SOC estimation module. The obtained SOC result is sent to a CAN network of a display device. The power battery SOC estimation system based on backward difference discrete model is simple in structure; the parameter identification speed and precision are increased; the affection to the identification caused by history data is reduced; the calculation is convenient; and the SOC estimation precision is high.

The invention discloses a portable universal digital storage oscilloscope. The passive probe connects with the signal transforming conditioning circuit, analog-digital conversion ADC circuit, data path and high frequency control module, DSP processor system, data interface, and the signal transforming conditioning circuit connects with the trigger function generating circuit, data path and high frequency control module, and ADC circuit, and digital signal LCD display connects with the DSP processor system, and the signal transforming conditioning circuit, and the rechargeable battery and AC-DC power module connect with the intelligent power switch and distribution circuit, and DSP processor system. The invention uses four ADC chips to phase interleaving sampling, which increasing bandwidth, and lower cost; the external power and internal battery can automatically switch to supply power, to intelligently control the power distribution, with low power, small size, and can be used in various testing field handheld; the single machine completes the signal processing result and displaying, audio recording and storing the output, which can set up and update procedures through data interface, and it is a portable universal digital storage oscilloscope.

A temperature measuring device of a power semiconductor apparatus that accurately detects chip temperature even where a gradient of the measured characteristic line segment is different from a designed gradient, including a chip temperature detecting circuit that includes an A/D converter delivering a measurement value of a digital converted forward voltage across a temperature detecting diode and an operational processing unit for calibration and chip temperature calculation. In calibration processing, different known reference voltages are applied by a reference connected in place of the diode and a gradient of the line segment connecting the measurement values is calculated. The gradient is stored in a memory with an offset correction value that is one of the measurement values. A chip temperature is calculated based on a forward voltage across the diode calculated based on the measurement value and the stored values of the gradient and the offset correction value.

A collaborative input system 10 includes a host computer 12. A display 14 is associated with the host computer. The host computer includes a processor 15 configured for executing an application to provide an image 17 on the display 14. At least one electromagnetic digitizer 18 is provided separate from the host computer. The digitizer 18 has an input surface 22 defining a display space that is mapped to coincide with the display 14, and a pen structure 24 operatively associated with the input surface such that proximity of the pen structure with respect to the input surface, as a result of a user's input, is detected by the digitizer. A wireless communication link is provided between the host computer and the digitizer such that a user's input can be transmitted from the digitizer, be received by the host computer, and be represented graphically on the display together with the image in real time, thereby permitting the user, associated with the digitizer, to personally provide input to the host computer displaying the image.

The invention discloses a radio-frequency micro-capacitance fingerprint acquisition chip and method. The chip comprises a plurality of reference sensing units, a two-dimensional sensing unit array formed by the reference sensing units, an insulating layer, an insulating substrate serving as a finger contact surface, a radio-frequency signal generation circuit, a radio-frequency drive electrode, a sensing unit array controller used for providing bias-power-supply switching signals for switching on or switching off the sensing units and charge-discharge sequence signals needed by the sensing units, an analog-digital conversion array, a digital-analog converter for controlling the gain of the analog-digital conversion array, a sensing unit offset correction circuit, a fingerprint image cache, a fingerprint image output controller and an image signal processor. Due to the improvement of the structure of the sensing units and the additional arrangement of the sensing unit offset correction circuit, the radio-frequency micro-capacitance fingerprint acquisition chip can solve the problems of fingerprint residual, interference caused by other radiofrequency radiation, false fingers and small detection depth; besides, the chip can be embedded into a capacitive touch screen.

An image sensing device includes a plurality of photoelectric conversion elements arranged in one direction for each color of received light, and an analog-digital (AD) convertor that performs analog-digital conversion for each pixel group configured by a plurality of photoelectric conversion elements selected from the photoelectric conversion elements. The AD converter is disposed in a position adjacent to each of the photoelectric conversion elements configuring the pixel group.

A semiconductor memory device, which performs a refresh operation, includes: a temperature sensing unit for measuring temperature and for generating a temperature controlled voltage and a reference current based on the measured temperature; an analog-digital conversion unit for converting the temperature controlled voltage to an N-bit digital signal; a refresh control unit for generating a refresh signal in response to the N-bit digital signal, wherein, a period of the refresh signal is controlled based on the N-bit digital signal.

The invention provides a successive approximation analog-digital converter and an analog-digital conversion method based on digital domain self-correcting. The successive approximation analog-digital converter comprises a CDAC, a comparator, an SAR control logic circuit, a correction control logic circuit, a storage, an adder and a clock circuit; a differential structure is adopted in the CDAC; capacitor arrays of the CDAC respectively form a high-M-level CDAC and a low-L-level CDAC; on the basis of a capacitor array reusing thought, mismatching errors of various capacitors in the high-M-level CDAC capacitor array are detected by reusing the low-L-level CDAC in a self-correcting stage; detected error values are quantized; error voltage is converted into an error code to output; the output error code is output into the storage; after mismatching error detection and quantization are completed, digital conversion of an input analog signal begins to perform; an original code is output, and operated with the error code at the corresponding bit called from the storage; therefore, the final output codeword after being corrected is obtained; and thus, the linearity of the SAR ADC is increased.

The invention relates to the field of electromagnetic touch, and discloses an electromagnetic pen, an electromagnetic touch receiving device and a wireless communication system composed of the electromagnetic pen and the electromagnetic touch receiving device. In the electromagnetic pen, the electromagnetic touch receiving device and the wireless communication system, a wireless transmitter is arranged in the electromagnetic pen and used for collecting useful signals of the electromagnetic pen and sending the useful signals to the electromagnetic touch receiving device through electromagnetic waves after the useful signals are combined to form data frames and modulated. A wireless receiver is arranged in the electromagnet touch receiving device and used for receiving electromagnetic signals transmitted by the electromagnetic pen through an antenna array, conducting filtering on the received signals, and conducting analog-digital conversion on the received signals to obtain digital signals. Preprocessing, demodulation and frame decoding are conducted on the digital signals through the digital signal processing technology, and received bit data flow is obtained and outputted. According to the scheme, the useful signals are sent after being combined to form the data frames and modulated, information is transmitted without purely relying on frequencies, and therefore abundant information transmission can be conducted between the electromagnetic pen and the electromagnetic touch receiving device.

Embodiments of the invention disclose a device and a method for screen vocal control, and a terminal, and the device and the method are applied in the field of screen vocal technique. The device for screen vocal control comprises a digital signal processor, a coder-decoder, a frequency divider, an amplifier, a driver, a motor, and a middle frame. The digital signal processor is used to perform analog-digital conversion processing on audio signals, to obtain digital signals. The coder-decoder is connected with the output end of the digital signal processor, and decodes digital signals to obtain decoded signals. The frequency divider is connected with the output end of the coder-decoder, and obtains high-frequency signals and low-frequency signals in the decoded signals. The amplifier is used to perform amplification processing on the high-frequency signals. The driver is connected with the output end of the amplifier, and drives a display screen to vibrate to sound. The motor is connected with the low-frequency signal output end of the frequency divider. The middle frame is connected with the motor, and the motor drives the middle frame to vibrate, so that the middle frame drives the display screen to vibrate and sound. Using the device and the method can ensure good low-frequency response effect of a screen vocal terminal.

A pressure distribution detection device is characterized in that a flexible array sensor unit (2) is sequentially connected with a signal conditioning and data acquisition unit (3) and a data display and analysis unit (4); the flexible array sensor unit (2) consists of a sensor array (1) and a Wheatstone bridge circuit; the sensor array (1) consists of sensor nodes; each sensor node is a strain disc (6); the strain discs (6) are arranged to form the sensor array (1) in a line and row manner; and each strain disc (6) constitutes the Wheatstone bridge circuit with three precision resistors with known resistance values. When ambient pressure is applied on the strain discs (6), the resistors change, and the variation information of the resistance value of the flexible array sensor unit (2) is collected through the signal conditioning and data acquisition unit (3) and is transmitted to the data display and analysis unit (4) after analog-digital conversion to be displayed and analyzed. The invention is applicable to such fields as biomechanical engineering, medical rehabilitation and rehabilitation assistant property detection.

In an analog-to-digital conversion method for converting a difference signal component representing a difference between a reference component and a signal component in an analog signal to be processed into digital data, in a first process, a signal corresponding to one of the reference component and the signal component is compared with a reference signal for conversion into the digital data. Concurrently with the comparison, counting is performed in one of a down-count mode and an up-count mode, and a count value at a time of completion of the comparison is held. In a second process, a signal corresponding to the other one of the reference component and the signal component is compared with the reference signal. Concurrently with the comparison, counting is performed in the other one of the down-count mode and the up-count mode, and a count value at a time of completion of the comparison is held.