43results about How to "Save CPU time" patented technology

The invention discloses a keyboard circuit capable of improving key-press scanning speed. In the keyboard circuit, one ends of each column line and row line are connected with a power supply through a current limiting resistor; the other ends of the column line which are multiplexed by a PNP (positive-negative-positive) switching transistor and the other ends of the m column lines which are multiplexed by an NPN (negative-positive-negative) switching transistor are connected correspondingly with the I / O interfaces, namely P1.1, P1.2,...,P1.m after being multiplexed; meanwhile, the half of therest column lines which are multiplexed by the PNP switching transistor and the other half which are multiplexed by the NPN switching transistor are correspondingly connected with I / O interfaces, namely P[1.(m+1)], P[1.(m+2)],...,P[1.(m +n) / 2]; the base of each switching transistor is connected to the I / O interface P[1.0] through the current limiting resistor; the column line and the row line of each key-press are connected with the ground wire through a combination switch; all the column lines are connected to the inputs of interrupt Input port through an AND circuit unit. The keyboard circuit provided by the invention has the advantages that when the sum of the column lines and the row lines of the key circuit is 2N, the required number of the I / O interfaces is N+1, and when the sum of the column lines and the row lines is 2N+1, the required number of the I / O interfaces is N+2 and the values of column and the row can be obtained after scanning for two times.

A double focal spot X-ray tube is used to acquire a set of two images PIα, PIβ for a given gantry position from slightly different view positions. The stereo or binocular disparity (BD) of imaged structures is used to estimate the object depth in view direction, which in turn is used to discriminate between objects inside IO and outside EO the body. Respective structures are virtually removed from the images PIα, PIβ.

The invention relates to the router design and research field of the mobile wireless self-organized network, which is more particularly characterized by including the flowing steps sequentially: the initial TTL values of the IP messages sent by all nodes are set to be 64. When the node sends an IP message, a router stored to a target IP is only sent to a next corresponding hop, or floods the messages to all the neighbors. When the node receives the IP message, the retransmitting hop times passed by the message can be analyzed according to the current TTL value of the message, and the shortest path to the source can be determined by combining the corresponding routing items of the node. The non-shortest routing produced in the process of flooding can be deleted for overtime as no corresponding IP message is transmitted. The invention realizes a novel rapid and simple Ad Hoc path-finding method with low protocol bandwidth consumption.

The invention discloses a monitoring method and system for MPEG video transmission quality, and relates to the field of video transmission quality monitoring. The DF calculation process of this method includes: after the monitoring node segments the video encoding data payload of the IP data packet in MPEG format, writes it into the MR file; For file segmentation, calculate MR according to the PCR and traversal offset of two file segments; after the monitoring node calculates the virtual cache VBpre and VBpost before and after receiving the IP packet, calculate DF according to the VBpre and VBpost calculated within the specified time; The MLR calculation process includes: the monitoring node calculates the MLR according to the SEQ field or the CC field of the IP data packet. The invention can accurately and efficiently calculate the DF and MLR of the video stream, and monitor the transmission quality of the MPEG video through the DF and the MLR.