14 results about "Digital conversion" patented technology

Disclosed is an analog to digital converter with several cascade-connected interpolation and selection circuits. The function of an interpolation circuit is to produce five pairs of output signals from three pairs of input signals and select three pairs from among the five pairs to apply them to the next stage. Each pair comprises two interpolation signals that vary symmetrically and monotonically as a function of the voltage Vin, the signals of one pair being equal when the voltage Vin is equal to a reference voltage associated with this pair. There are five reference voltage associated with the five pairs. Among these five reference voltages, the three reference voltages (and therefore also the three corresponding pairs of signals) that most closely surround the input voltage Vin are selected. The reference voltages are increasingly closer together as the operation progresses in the succession of cascade-connected stages. The signals used to select the pairs of signals are used in a decoder that gives the bits of the analog-digital conversion.

The invention discloses an electrostatic type lampblack purifier lampblack monitoring cleaning system and a monitoring cleaning method. The electrostatic type lampblack purifier lampblack monitoring cleaning system comprises a purifier data collector arranged on a power supply circuit of an electrostatic type lampblack purifier and a fan data collector arranged on a fan, an analog-digital conversion unit, an industrial personal computer and a background server, wherein the analog-digital conversion unit is used for changing a current signal collected by the purifier data collector and the fan data collector into a digital signal so as to be sent to the industrial personal computer; the industrial personal computer is provided with a GPRS (general packet radio service) data transmitter module, the background server is provided with a GPRS data sending-receiving module, so that the data of the industrial personal computer is transferred to the background server so as to carry out real-time monitoring. The invention also discloses a lampblack monitoring cleaning method of the electrostatic type lampblack purifier. The purifier data collector collets an I practical peak value and an I practical valley value in each interval setting time, and the industrial personal computer executes a sweeping task according to a setting algorithm.

A sensor device is provided with a voltage detection type sensor unit for converting a physical quantity into a voltage value and outputting a voltage signal indicating the voltage value; a chopper amplifier unit for generating a modulation signal by chopping the voltage signal output from the sensor unit with a predetermined chopping frequency, amplifying the modulation signal into an amplification signal, then demodulating the amplification signal and outputting it as an output signal; an integration unit including an operational amplifier, an input resistor connected to the inverting input terminal of the operational amplifier and a capacitor connected between the inverting input terminal and an output terminal of the operational amplifier; and a digital conversion unit for converting the output signal integrated by the integration unit into a digital signal.

The invention relates to a constant voltage discharge adjusting device of a fuel cell and an adjusting method thereof, and the constant voltage discharge adjusting device comprises a controller, an analog-digital conversion circuit, a digital-analog conversion circuit, a voltage sampling circuit, a voltage comparing circuit and a current regulating circuit, wherein the analog-digital conversion circuit is connected into analog quantity sampled voltage output by the voltage sampling circuit; the controller is connected into digital quantity sampled voltage output by the analog-digital conversion circuit; the digital-analog conversion circuit is connected into adjusted voltage output by the controller; the voltage comparing circuit is connected into analog quantity voltage output by the voltage sampling circuit and analog quantity adjusted voltage output by the digital-analog conversion circuit respectively, and control voltage is output after comparison and then connected into the current regulating circuit; and the current regulating circuit is connected with the fuel cell in series for forming a discharge loop. By adopting the adjusting device and the adjusting method, the fuel cell can be quickly and accurately controlled to set voltage for performing constant voltage discharge, thereby well overcoming the shortcoming of long constant voltage discharge adjustment time of thefuel cell.

The invention discloses a wireless type-based soil temperature and moisture gradient measuring system. The soil temperature and moisture gradient measuring system comprises sensor groups consisting of soil temperature sensors and soil moisture sensors, wherein each sensor group is arranged in a vertical gradient direction of soil to be measured, a sensor node is formed by multiple sensor groups in the same vertical gradient direction through an analog-digital conversion channel, a node transmission network is formed by a ZigBee wireless network and a routing node between every two sensor nodes, the node transmission network is connected with a central acquisition node through a multi-channel analog switch to form a star topology structure, and the central acquisition node carries out internal storage and precision calibration on data transmitted by the sensor node, and transmits the processed data to a data display terminal through an RS232/RS485 communication interface for observation and analysis. By adopting the technical scheme of the invention, the measurement of three-dimensional soil temperature and moisture is achieved, and each sensor node is used for wireless transmission of data, so that the energy consumption is low, and the applicable occasions are wide.

The invention discloses a QPSK-DS communication detecting method based on delay multiplication. A system is initialized and begins to scan a target frequency band to amplify signals entering the system from the radio frequency front end, radio frequency signals are converted into fixed middle frequency to be amplified through a difference frequency method, digital signals can be achieved through analog-digital conversion, delay multiplication operation is carried out, digital lowpass filtering is carried out to obtain lowpass signals, and a frequency spectrum of the lowpass signals can be achieved through an FFT algorithm. The QPSK-DS communication detecting method has the advantages of adopting a linear and non-linear processing method to achieve full detection on QPSK-DS communication through simple comprehensive analysis and processing on time frequency domains and being simple to achieve, strong in operability and strong in capacity adapting to low signal to noise ratio. Meanwhile, the method adopts the middle frequency analysis instead of radio frequency or baseband processing to avoid high requirements for performance of processing capacity of a receiver as possible. Furthermore, the method can achieve real-time processing easily and is strong in practicability.

The invention relates to the field of infrared induction, and discloses a read circuit for multi-row interleaved integral. The read circuit can be arranged in an uncooled infrared focal plane array. The read circuit comprises a drive circuit, an output circuit and a first quantity of read column circuit, wherein the output circuit is connected with the read column circuit, each column of read column circuit comprises a second quantity of read row circuit, a third quantity of integral module, and a third quantity of analog-digital conversion module, the drive circuit is a drive circuit, and thedrive circuit controls the read row circuit to perform integral amplification, sampling and analog-digital conversion row by row. Each row circuit acts separately and performs integral amplification,sampling and analog-digital conversion step by step, so that concentrated interference and noise are scattered, the noise of the public node is reduced, and the read circuit is more flexible.

The invention is a kind of neutron phase contrast chromatographic imaging equipment, including rotational platform, sparkling body, aluminium mirror, CCD camera, comuputer and camera bellows, the sparkling body, aluminium mirror and CCD camera placed in the camera bellows, and the neutron beam reaches the sample placed on the platform, the produced diffractive neutron makes vertical incidence andis received by the sparkling body and converted into the visible light with the sample information, which then is reflected onto the CCD camera by the aluminium mirror and after digital conversion inputted into the computer.

The invention discloses a digital chromatographic system which is composed of a central control unit, a communication module, a digital conversion module and a chromatographic device. The chromatographic device is a full-automatic purification system, the chromatographic device comprises a UV detector, a membrane pump, a pressure detector, a flow detector, a pH and Conductivity detector, a liquidlevel detector and an automatic valve; the system is provided with an RS485 communication module, an RS232 module and a ProfibusDP remote module; the communication module is direct in digital communication with an instrument and reads or writes in related numerical values; the digital conversion module converts on-site common analog signals into digital signals and transmits the digital signals into a control unit through the digital communication technology; the control unit and the instrument are subjected to full-digital communication control, after digital communication is introduced, analog signal attenuation, analog signal interference, installing circuit complexity and other problems in the prior art are solved, and water solutions and solutions with large viscosity can be effectively distinguished through an IOLink sensor.

Reducing power consumption without reducing the number of pixel signals in a solid-state imaging element that performs AD conversion of a pixel signal. A pixel array unit includes a plurality of lines each having a plurality of pixels arranged in a predetermined direction. A scanning circuit sequentially selects the plurality of lines and then controls to output an analog signal from each of the pixels within the selected line in a non-addition mode, and simultaneously selects the plurality of lines and controls to add up the analog signals of each of the pixels arranged in a direction perpendicular to the predetermined direction and output the added signals in a pixel addition mode. The analog-to-digital conversion unit converts each of the analog signals into a digital signal. The control unit performs control of switching from one of the pixel addition mode and the non-addition mode to the other on the basis of the digital signal.

The invention discloses a high-speed signal spectrum analyzing method based on stm32f4, the method comprises collecting a to-be-analyzed analog signal of a high-speed signal, and performing filtering preprocessing on the collected analog signal; and performing analog-digital conversion on the processed analog signal and the like. According to the invention, the high-speed signal spectrum analyzing is realized, and a problem that the high-speed signal spectrum analyzing is inconvenient is solved.

The invention discloses a rotatable LCD (liquid crystal display) control system applied to a digital camera. The rotatable LCD control system comprises an analog-digital conversion unit, a sensing unit, a main control unit, a display unit and an execution unit which are connected with a main control module of the camera, the analog-digital conversion unit, the sensing unit, the execution unit and the display unit are connected with the main control unit respectively, and the execution unit is connected with a lens module of the camera; in a working state, the sensing unit is mounted on the lens module of the camera and used for sensing sensing signals applied on a lens by a user, converting the sensing signals into electric signals and then transmitting the electric signals to the main control unit, the main control unit receives the sensing signals, processes the same and outputs a control instruction, and the execution unit receives instruction information to rotate the lens module by corresponding angles.

The invention discloses a power amplifier monitoring method and a power amplification circuit, and the method comprises the steps: collecting an analog voltage group and an analog current group of a power amplifier in real time through a collection module, and transmitting the analog voltage group and the analog current group to a conversion module; performing voltage analog-to-digital conversion on the analog voltage group through a conversion module to obtain a digital voltage group, performing current analog-to-digital conversion on the analog current group to obtain a digital current group, and transmitting the digital voltage group and the digital current group to a monitoring module; the monitoring module outputs the working parameters of the digital voltage group and the digital current group to obtain the parameter group and judges the threshold values of the working parameters in the parameter group to obtain the monitoring result, and the monitoring result shows whether the power amplifier works in the safe area or not. The working state of the power amplifier is accurately monitored, and the performance of the power amplifier is fully utilized.