49results about How to "Accurate loss" patented technology

Optimization of evoked response detection in an automatic capture detection system employed by an implantable cardiac stimulation device is presented. Patient state information is used to determine the appropriate settings of variables that are associated with the evoked response signal detection algorithm. The variables used by the evoked response signal detection algorithm are first established for the patient in a variety of positions. During operation of the implantable cardiac stimulation device, the patient state is monitored and the variables used by the evoked response signal detection algorithm are adjusted accordingly.

The present invention discloses an intelligent on-line monitoring method of oil-gas pipeline leak based on distribution type optical fiber sensor. Near the oil gas pipeline, one or several optical cable is set up parallel to the oil gas pipeline and uses the optical fiber as sensor to proceed real-time monitoring of oil-gas pipeline; at two ends of the optical fiber, that is at the inlet end and outlet end of oil-gas pipeline, a set of luminous power detecting module is equipped at each end and is connected with a computer, the computer is used to proceed analysis of data and obtain the characteristic of pressure change and vibration signal around the pipeline, thereby can discover and accurately determine the position of leak of the oil-gas pipeline.

This invention relates to WDM light transmission system of a link gain automatic adjustment and an automatic adjust method. The invention detects a received light power of a light monitor channel wavelength at the lower-reach station of a given cross distance section and computes the fiber circuit loss of said section by the difference between sent light power of the upper reach station and the received light power of the lower reach station, then to adjust the light power attenuation value of the light adjustable attenuator of said section lower reach station based on the loss to match the circuit loss and the gain of light amplified relay.

The invention discloses a sensing optical fiber for testing safety of long-distance oil-and-gas pipeline, including a rubber rope with first and second circular holes eccentricly installed on two sides of its central diameter, tight bush whose elastic modulus changes periodically with sensing optical fiber in it and a beam of tension resistance yarn placed paralleled with it are installed in the first circular hole, loose bush wherein are several optical fiber used to communicate to communicate and another beam of tension resistance placed paralleled with it are installed in the second circular hole. Besides the second circular hole is a layer of net cloth layer than 1/2 of rubber rope circumference and it is spirally wraped and fixed fixed by metal wire, having the same diameter with rubber rope and circumference of the diameter is packed successively by spiral metal wire mental wire and outer layer. Pipeline leaking and outer incident which may do harm to pipeline safety are accurately positioned through measurement to deflection light power of sensing optical fiber in sensing optical fiber along the pipeline.

The invention relates to a device for testing a pipe resistance coefficient of a water supply pipe network. The device for testing a pipe resistance coefficient of a water supply pipe network comprises a pipe system, a pressure testing module, a flow testing module and a control system. The pipe system comprises a main pipe section, a branch pipe section, a front fire hydrant, a middle fire hydrant and a rear fire hydrant. The pressure testing module comprises pressure sensors. The pressure sensors are installed on the front fire hydrant and the middle fire hydrant. A rear control valve is arranged on the main pipe section. A front control valve is arranged on the branch pipe section. The pressure testing module is connected to the control system through an interface converter. The flow testing module comprises an ultrasonic flowmeter. The ultrasonic flowmeter is installed on the rear fire hydrant. An intelligent recording system is arranged in the control system. The device for testing a pipe resistance coefficient of a water supply pipe network is greatly developed in improvement of measurement accuracy, fast and accurate recording and high-efficiency data processing, provides a perfect method for accurate determination of a pipe resistance coefficient, and promotes the development of a pipe resistance actual measurement technology for a water supply pipe network.

The invention relates to a method and system for determining the loss of a low-voltage transformer area based on power consumption collection data, and the method comprises the steps: obtaining the power consumption high-frequency collection data of each user sub-meter in a first preset time period, and obtaining the power supply metering value of a transformer area total meter in each second preset time period, obtaining freezing power consumption of each user sub-table in each second preset time period; determining a transformer area line loss expression of the low-voltage transformer area in each second preset time period; determining a statistical line loss equation of the low-voltage transformer area in each second preset time period; establishing a statistical line loss equation set,and solving according to the power consumption high-frequency acquisition data, the power supply metering value and the frozen power consumption so as to determine the metering error of each user sub-meter in the low-voltage transformer area, the fixed loss of the transformer area and the equivalent resistance of each branch; and substituting the metering error of each user sub-meter in the low-voltage transformer area and the equivalent resistance of each branch into a transformer area line loss expression, and determining the transformer area line loss of the low-voltage transformer area.

The embodiment of the invention discloses a compensation method and device for an indoor positioning wireless signal and a positioning method and device. The compensation method and device for the indoor positioning wireless signal comprises the steps of obtaining a target image sent by a terminal, received signal strength of the wireless signal and identification information of a transmitting node corresponding to the wireless signal; determining the number of people in the target image; determining target body penetration loss according to the number of the people and a specific absorption rate; obtaining transmitted signal strength according to the identification information; obtaining target path loss according to a compensation relationship that the transmitted signal strength is equal to the sum of the received signal strength, the target path loss and the target body penetration loss, wherein the target path loss comprises free space loss of the wireless signal and loss resulting from barriers except the people. Through application of the scheme, the RSS (Received Signal Strength) is further compensated, and the positioning precision based on an RSS positioning method is improved.

A video program length is changed by processing an MPEG compressed video signal. Two temporally adjacent B-frames are selected, by looking for pairs with small differences. The selected B-frames are combined to create at least one intermediate frame; which is inserted in place of or between the selected frames. Presentation time stamps are altered to provide a uniform display rate.

The present invention relates to an internet telephone and a method for recovering voice data lost in the internet telephone. Whether there is any voice data lost in a voice data packet received via the internet network and the position information for a lost portion of the voice data is obtained. A voice data normally received previously to the lost portion is filled in the lost portion of the voice data. In making a telephone call using the internet, the speech quality is improved by correcting the lost voice signal.

The invention discloses a method and device for calculating the line loss of a distribution network. The distribution network comprises at least one branch line and at least one load point. The method comprises the steps that a reference load curve of the load point is adjusted based on the power measurement value of the load point to generate a predicted load curve of the load point, wherein the reference load curve is a curve of the consumed power of the load point relative to time; the line loss of the distribution network is calculated based on the predicted load curve of the load point. By means of the method and device, the line loss of the distribute network can be calculated more accurately.

An object of the present invention is to provide a device for detecting as to whether or not the heterogeneous tires are set on the right and left wheels, respectively, and accurately detecting the loss of the pneumatic pressure in the tire, even when heterogeneous tires are set on the right and the left wheels, respectively. This is a method for detecting as to whether or not the kinds of the tires set on a vehicle are different based on the rotational velocity of the wheels set on the vehicle, so that, when the pneumatic pressure of the tire set on said vehicle is normal, the velocity ratios of the right and left front wheels or the velocity ratios of the right and left rear wheels are obtained by each velocity region of the vehicle as described above, and comparison is made between the wheel velocity ratios of the right and left front wheels by each velocity region or between the wheel velocity ratios of the right and left rear wheels by each velocity region, thereby detecting that the heterogeneous tires are set between the right and left sides. Furthermore, the method for detecting loss of the pneumatic pressures of tires according to the present invention is designed to modify the threshold value for judging loss of the pneumatic pressures of the tires based on the results detected by the method for detecting the heterogeneous tires as described above.

The invention discloses an elastic contact three-electrode device, and relates to equipment for measuring the dielectric constant and loss angle tangent of an electric insulation material. The device comprises a high-pressure electrode (1) connected with a high-pressure end H of a balanced bridge, and a test sample (2) on the high-pressure electrode (1), wherein a measuring electrode (13) and a shielding electrode (3) connected with a protection end G of the balanced bridge are arranged on the test sample (2). The device is characterized in that: the top of the measuring electrode (13) is provided with a metal corrugated pipe (12), a corrugated pipe suite (11), an insulation support (10) and a measuring end connector socket (9) connected with a measuring end M of the balanced bridge; the shielding electrode (3) is connected with an upper shielding electrode (6), an upper shielding electrode cover plate (7) and a counter weight (8) through a shielding electrode connecting ring (4) in threaded connection with the shielding electrode (3); and a measuring electrode positioning ring (5) is arranged between the measuring electrode (13) and the shielding electrode (3). The device has high measuring accuracy and is suitable for a thick film or a thin flat plate with a low-loss medium.

The invention discloses a marine radar radio frequency cable transmission loss automatic compensation apparatus. The apparatus comprises a test signal source; a selection switch whose first input end and second input end are respectively connected with the output end of a radar receiver and the output end of the test signal source; a variable gain amplifier which has an input end connected with the output end of the selection switch and an output end connected with one end of a connection cable; an analog-to-digital converter whose input end is connected with the other end of the connection cable; an FPGA digital processing unit whose input end is connected with the output end of the analog-to-digital converter; and a main controller MCU which is respectively connected with the FPGA digital processing unit, the selection switch and the variable gain amplifier. The invention further discloses a compensation method of the compensation apparatus. According to the invention, by full use of the original signal processing process of a system, the transmission loss of a marine radar cable is automatically compensated.

In a driving condition control system, a sensing unit is configured to sense a first physical quantity indicative of a rotation of the first rotatable axle assembly and a second physical quantity indicative of a rotation of the second rotatable axle assembly. A correcting unit is configured to correct the torque according to the sensed first and second physical quantities of the rotations of the first and second rotational axle assemblies. This allows the torque to be precisely obtained.