161 results about "Direct transformation" patented technology

In a frequency modulation radio receiver with direct conversion, a local oscillator signal is generated having a frequency within a preselected frequency range and the frequency is varied in response to a variable low frequency signal; the local oscillator signal is mixed with a received signal to provide a baseband signal. The variable low frequency signal is generated by a controlled oscillator in inverse relationship to a direct current component in said baseband signal. In a frequency modulation radio transceiver a broadcast function is provided by varying the low frequency signal with an information signal with the resulting local oscillator frequency being varied accordingly and amplified for broadcast. The transceiver is controlled to operate alternately in either a receive mode and a broadcast mode at substantially the same frequency. While in the receive mode the controlled oscillator causes the local oscillator signal to be drawn toward the carrier frequency of a received signal yielding preferred direct conversion of modulating information into the base band.

The present invention provides an adaptive, intelligent transform based Analog to Information Converter (AIC) for wideband signals by directly converting an analog signal to information (e.g., features, decisions). This direct conversion is achieved by (i) capturing most of the information of a wideband signal via hardware/software implemented mathematical transformations, (ii) effectively removing unwanted signals such as jammer and interfere from the input signal, and (iii) using novel algorithms for highly accurate decision making and feature extraction (e.g., high probability of detection with low probability of false alarm). The jump in the improvement over today's state-of-the-art is in terms of effective and optimum signal information extraction at high-speed.

A dual band direct conversion architecture for both the receive (RX) and transmit (TX) path of a communications transceiver that minimizes the transceiver area by sharing common circuits used in both RX and TX paths is disclosed. The transceiver also allows the use of extensive digital calibration in order to achieve performance adequate to support high bit rate modulation schemes.

The present invention is a system for accessing applications from even the most basic Instant Message (IM) enabled mobile device. The system utilizes the IM infrastructure of a mobile device to deliver application interfaces and manage the user experience. The invention is particularly applicable to applications with graphical user interfaces (GUI), even typical desktop or web applications. The system performs a direct transformation of application user interfaces into an IM messaging model with minimal functional distortions. The users own application knowledge and experience is leveraged, reducing application customization in the system architecture. The system also incorporates presence-driven mechanisms in the architecture.

Most modern integrated circuit transceivers, especially wireless LAN, utilize a direct conversion radio architecture, which is highly advantageous from the perspectives of cost and flexibility, there exist several performance impairments, including gain and phase imbalances between the in-phase (I) and quadrature (Q) of a transmitter or receiver. Disclosed herein is a signal processing methodology and system for compensation of I/Q imbalance for a direct conversion packet-switched OFDM communications system. The imbalance, which accounts for transmitter I/Q imbalance, RX I/Q imbalance, phase/frequency error, and dispersive multipath fading. Both frequency dependent I/Q imbalance and frequency independent cases are considered, covering both wideband and narrowband modulation. The proposed estimation algorithms operate within the fully compliant framework of existing multi-user OFDM radio standards (WLAN, LTE, WimAX). These algorithms accurately estimate and correct transceiver I/Q imbalance on a packet-by-packet basis, all within the receiver's digital baseband.

In devices used for the direct conversion of heat into electricity, or vice versa, known in the art as thermoelectric power generators, thermoelectric refrigerators and thermoelectric heat pumps, the efficiency of energy conversion and/or coefficient of performance have been considerably lower than those of conventional reciprocating or rotary, heat engines and/or vapor-compression systems, employing certain refrigerants. The energy conversion efficiency of power generating devices, for example, aside from the hot and cold junction temperatures, also depends on a parameter known in the art as the thermoelectric figure of merit Z=S2sigma/k, where S is the thermoelectric power, sigma is the electrical conductivity and k is the thermal conductivity, of the material that constitutes the p-type, and/or n-type, thermoelements, or branches, of the said devices. In order to achieve a considerable increase in the energy conversion efficiency, a thermoelectric figure of merit of the order of 10-2 K-1, or more, is needed. It is reasonably expected that such an order of magnitude, for the figure of merit, can be realized with a composition of matter, comprising magnesium, silicon, lead and barium, and optionally comprising one, or more, additional doping materials.

A radio frequency (RF) tuner includes a programmable tracking filter bank receiving an RF input and outputting a filtered RF signal. A mixer stage receives the filtered RF signal and outputs a first quadrature component of the filtered RF signal and a second quadrature component of the filtered RF signal. Two variable gain amplifiers receive the first and second quadrature components and output amplitude-controlled I and Q components of the filtered RF signal. In one embodiment, the programmable tracking filter bank includes a plurality of tank circuits each connected to the RF input through an impedance. Each tank circuit include an inductor and a capacitor connected in parallel thereby forming an LC network, and a plurality of switched capacitors in parallel with the LC network and switched in and out of the tank circuit by programmable switches. In another embodiment, the programmable tracking filter bank includes a plurality of peaked low-pass circuits each connected to the RF input through an impedance. Each peaked low-pass circuit includes a capacitor connected to ground, and a plurality of switched capacitors in parallel with the capacitor and switched in and out of the peaked low-pass circuit by programmable switches.

The invention provides a feature line fused laser point cloud and analog image registration method, and aims to solve the problems that a point cloud distance intensity image or point feature-based image and point cloud registration method in the prior art has many defects of manual point selection errors, point cloud data interpolation errors, need of many observation values and the like, and theprecision is very limited. The invention provides a laser point cloud and analog image registration method based on two-dimensional and three-dimensional fusion characteristic lines. The method comprises the steps of: establishing a direct transformation model between the image feature line and the point cloud feature line. The requirement on the initial value of the exterior orientation elementof the image is not harsh, the method has high robustness to noise, realizes automatic matching of two-dimensional and three-dimensional fusion features, improves the degree of automation, achieves higher real-time performance, has the advantages of no model error, no need of exterior orientation element initial values, only need of a small number of registration elements and the like, is high incalculation speed, and meets the registration requirements of analog images and ground laser point cloud data.

The DCOC block is used in ZIF BB to form HPF function to cancel dc offset with a penalty of small silicon area and low power consumption. It is a LPF plus a voltage to current conversion (VIC) resistor, and can hook up with any BB opamp used in signal path, to form a feedback loop, with or without signal gain stages in the loop. The BB opamp is used as a summing point. The summing method is input current summing. The cutoff frequency of the HPF function is thus defined by the integrator, the VIC resistor, and the feedback resistor in the summing opamp. The presence of the VIC resistor can drastically reduce the integrator capacitor and resistor values and thus save silicon area or improve receiver performance.

Based on software developed with use-cases, a suite of metrics for the Product/Process (PP) complexity of software systems as well the PP complexity of each stage in the software development process—analysis, design, and testing—is provided. The metrics suite is important for software quality assurance—Validation and Verification (V&V) as well as for understanding new complexities brought into software development by new technologies. The metrics can be collected based on the two most important documents of use-case software development—scenario diagrams and state diagrams. All metrics are CASE tool computable. Thus, each iterative or incremental development process can be quantitatively measured and compared without incurring extra cost or load on the project team. Efficiency metrics for implementation and test stages, normalization rules and logic-metrics for business tables are also presented. A three-level software visualization approach may have impact on graphical programming or direct transformation.

A direct conversion tuner down-converts television signals, cable signals, or other signals directly from an RF frequency to an IF frequency and/or baseband, without an intermediate up-conversion step for image rejection. The direct conversion tuner includes a pre-select filter, an amplifier, an image reject mixer, and a poly-phase filter. The pre-select filter, amplifier, and the image reject mixer can be calibrated to provide sufficient image rejection to meet the NTSC requirements for TV signals. The entire direct conversion tuner can be fabricated on a single semiconductor substrate without requiring any off-chip components. The tuner configuration described herein is not limited to processing TV signals, and can be utilized to down-convert other RF signals to an IF frequency or baseband.

A detector module comprises: a direct conversion crystal for converting incident photons into electrical signals, the direct conversion crystal having an anode layer deposited on a first surface and a cathode layer deposited on a second surface; a redistribution layer deposited on the anode layer, the redistribution layer configured to adapt a pad array layout of the direct conversion crystal to a predetermined lead pattern; an integrated circuit in electrical communication with the direct conversion crystal; and a plurality of input/output electrical paths connected to the redistribution layer to provide connectivity between the imaging module and another level of interconnect.

In a cellular telephone provided with a receiving circuit of a direct conversion type, a passive low-pass filter is arranged between a mixer for an I-channel and a base band circuit for removing interference waves of or above a channel next to a channel neighboring to the I-channel, and another passive low-pass filter is arranged between a mixer for a Q-channel and the base band circuit for removing interference waves of or above a channel next to a channel neighboring to the Q-channel. Since the low-pass filters for removing the interference waves of or above the channel next to the neighboring channel are of a differential type, the circuit scale can be small, and the power consumption is small. Since the interference waves are removed by the passive low-pass filters and the active low-pass filters, only the desired channel can be reliably received.

A radio frequency receiver includes an amplifier and a detector that produces a bias control signal indicating the level of the signal environment in which the receiver is currently operating. A bias generator sets the bias level of the amplifier according to the bias control signal, where the bias level tends to increase as the signal level increases. Further, the receiver, includes a first circuit adapted to receive a radio frequency input signal, the circuit having an adjustable bias level, a bias control having more than one level of control for generating a bias control signal based upon a base-band signal for controlling the first circuit and generating an output signal; and an alternative bypass switch across the first circuit so as to send a DC signal corresponding to the total power generated by said feedback means.

The invention belongs to the technical field of preparing ethyl levulinate, in particular to a direct transformation process of ethyl levulinate by hydrolysis of cellulose materials. The process comprises the following steps: adding the cellulose materials into a reaction system comprising ethanol, liquid acid catalyst/solid acid catalyst, and cosolvent, hydrolyzing for 2 to 60 minutes at the temperature of 150 to 230 DEG C to obtain hydrolyzate containing the ethyl levulinate, and purifying the hydrolyzate to obtain the ethyl levulinate. In the invention, the cosolvent is added into the hydrolysis system of the cellulose materials, and the intermediate products such as hydromethyl furfural, the levulinic acid and the like generated during the hydrolysis of the cellulose materials can be extracted into an organic phase containing the cosolvent in the presence of the cosolvent, thereby preventing the further reduction of the intermediate products, facilitating the reduction of by-products and facilitating the yield increase of ethyl levulinate.

The invention relates to a honeycomb core end surface gridding sizing process method based on adhesive film thermal fracture. The honeycomb core end surface gridding sizing process method comprises the following steps of: tensioning the end surface of a honeycomb core by designing a special tool; instantly heating the upper surface of the adhesive film which is flat adhered to the end surface of the honeycomb core by adopting a linear type heating device and a heat air blowing device so that the upper surface of the adhesive film is heated to be softened and inwards recessed into a honeycomb core grid under the action of gravity; reversely exerting high-pressure heat air on the adhesive film along the axial direction of the honeycomb core grid so that the adhesive film is expanded, fractured, shrunk and uniformly collected on the end surface of the seamed edge of the honeycomb core grid, and thus the direct transformation of an adhesive from an adhesive film state to a honeycomb gridding state is realized. The honeycomb core end surface gridding sizing process disclosed by the invention realizes the large-area, one-time, uniform and gridding sizing of the end surface of the honeycomb core by carrying out synchronous and horizontal heating/blowing scanning on the honeycomb core/adhesive film and sufficiently utilizing the advantage of uniformity of the surface density of the structural adhesive film and meets the requirements for small chemical state change and uniform physical distribution state of the large-area honeycomb core gridding sizing on the adhesive.

The invention belongs to the field of rare earth wet metallurgy and industrial chemistry, and relates to a clean production technology for roasting rare earth concentration to leach rare earth by the sulphate method. Aiming at the prior roasting production technology by the sulphate method taking Baotou rare earth concentration as raw materials, the technological process of the clean production technology realizes direct transformation production from sulphate to carbonate by the transformation technology of double decomposition reaction in chemical process and according to the principle of mutual transformation between solid substances with different solubility products. Non-rare-earth compounds (such as ammonium sulphate and ammonium carbonate) and the like are fully recovered with low cost; simultaneously, water can be fully recycled and used; the intermediate impurity removing technology is adopted to recover non-rare-earth substances such as Ca from rare earth ore. Therefore, the purpose of full-recycling and clean production in rare earth leaching process by the sulphate roasting method is realized. The technology has the advantages that the production process of rare earth ore sulphate method fully recovers rare earth elements and valuable elements from mineral products with lower cost, and clean production without sewage emission is realized.

A direct conversion receiver with an integrated self alignment tuner. The system includes a tank circuit, an analog to digital converter, a digital down converter, a digital up converter, a local oscillator, and a digital to analog converter. The tank circuit receives a radio frequency signal from an antenna input. The analog to digital converter is connected to the tank circuit to digitize the tank output signal and generate a corresponding digital signal. The digital down converter is in communication with the analog to digital converter and generates an intermediate frequency signal based on the digital signal and the output of the local oscillator. The digital up converter is in communication with the digital to analog converter to generate a radio frequency test signal, where the digital to analog converter provides the radio frequency test signal to the antenna input.

The invention discloses an electroencephalogram monitoring device with an epileptic seizure predicting function and a method. The electroencephalogram monitoring device and method can be applied to ascalp electroencephalograph machine or an embedded cortex electroencephalogram monitoring system. The method of the device comprises the following steps of 1, acquiring an electroencephalogram signalof a patient through an electroencephalogram acquisition device; 2, transmitting the electroencephalogram signal to an epileptic predicting alarming device; 3, judging the state of the patient throughan epilepticprediction algorithm module in the epileptic predicting alarming device, and once the epileptic measurement module judges that the patient is in the early stage of anepileptic seizure, sound-lightalarm can be triggered, and the patient and his/her dependents are prompted to take prevention measures. The epilepticprediction algorithm moduleuses a directed transformation function as a basis and characteristics of a connection matrix among electroencephalogram signals as parameters for predicting the epilepticseizure of the patient, the epileptic seizure can be predicted several dozens of minutes in advance, and the electroencephalogram monitoring device and method have high clinical and practical significance.