56results about How to "Reduce conversion error" patented technology

In a data converting circuit, an approximation calculation circuit calculates an approximation value of an output to input data by using an n-th order equation (n is an integer equal to or more than one). An error reducing circuit generates an error correction value by using a multiplication factor determined based on the input data. An addition section adds the approximation value and the error correction value and outputs an addition result.

The invention relates to a shield-tunneling-machine shield-tail-gap visual measurement method. The method comprises the following steps of (1) installing a camera, wherein a height between the camera and a shield-tunneling-machine bottom shield shell is h; (2) shooting original image of a shield tunneling machine during a work process by the camera, wherein the original image include a pipe-sheet upper edge and a pipe-sheet lower edge, and the pipe-sheet lower edge is an upper edge of a shield tail gap; (3) taking a horizontal shaft where a center point of the original image is located as a segmentation line and dividing the original image into a first subimage and a second subimage, wherein the second subimage includes the pipe-sheet upper edge; (4) acquiring the pipe-sheet upper edge from the second subimage, and acquiring a distance between the pipe-sheet upper edge and the center point of the original image in the original image d2; (5) converting the d2 into an actual height h2; and (6) according to the following formula, acquiring the shield tail gap d, wherein the formula is d=h+h2-d3, and the d3 is an actual height of a pipe sheet. Compared to the prior art, by using the method of the invention, the method is simple and a measurement result is accurate and reliable.

The invention provides an oral cavity positioner, which includes a bracket, a clamp, a positioning ball and an infrared reflective ball. The connecting part of the fixed part and the positioning part; the clamp is arranged on the fixed part, including a fixed arm, a clamping arm, an adjusting arm and a set screw, and the clamping arm is rotatably installed on the fixed part, and is used to approach the fixed arm by turning Clamp molars or dental arches; the adjusting arm is connected with the clamping arm, and the adjusting arm is provided with a threaded hole; the set screw is threaded on the threaded hole, and one end of the set screw passes through the threaded hole to abut against the fixed part, It is used to drive the clamping arm to rotate by screwing in or out of the set screw; the positioning ball is installed on the fixed part to determine the relationship between the three-dimensional medical image coordinate system and the oral positioner coordinate system; the infrared reflective ball is installed on the positioning part , used to determine the position of the oral locator coordinate system in space.

A amplitude adjustment device of degital optical circulator based on the FPGA is disclosed, the light come from the light source (S1) is incidengted into the coupler (S3), and two beams are obtained via the coupler (S3), one of the two beams is merotomized into two beams each of which is incidengted into the two ends of the fibre-optical ring (S5) via the optical waveguide modulator (S4), the twobeams are synthesized into one beam and interference after one loop circulating the fibre-optical ring (S5) and passing through the optical waveguide modulator (S4); then the beam is incidengted intothe detector (S2) via the coupler (S3), the electrical signal which expresses the optical power passes the front amplifying circuit (E1) to be enlarged and filted after the conversion in detector (S2), passes the A / D converter (E2) to complete the analogue / digital conversion to output the degital signal to the signal processing module (E3) which outputs the degital modulating signal to D / A converter (E4), the analog signal outputed is enlarged by the modulation amplifying circuit (E5) and is outputed to the optical waveguide modulator (S4). The invention makes the output voltage alignment circuit of the modulating step wave integrated just in one chip of FPGA processor, not getting involved in the simulation model. The attitude of the square wave uses the digital shift mode directly and is gained from the step wave resetting voltage. The square wave and the step wave is added directly in digital-sum in FPGA instead of adding in analog add circuit.