42results about How to "Shorten the scan cycle" patented technology

The invention provides a loop vehicle detector which is internally provided with a plurality of external feeder lines, a secondary coil inductance connected with the external feeder lines, a channel scanning circuit connected with the secondary coil inductance and a singlechip connected with the channel scanning circuit, wherein the singlechip controls the channel scanning circuit to open the next input channel and close the previous one; and when the singlechip detects that the connection between one of the input channels and the external feeder lines is interrupted, the singlechip shields the input channels and detects the next input channel, thereby shortening the scanning period, accelerating the scanning frequency, enhancing the system precision and improving the reliability of data acquisition compared with the prior art.

The invention discloses a delay request processing method and device based on a token bucket, relates to the technical field of communication, and is invented for shortening the scanning period during delay request processing. The method includes: receiving a delay request message of a queue corresponding to the token bucket, the delay request message including a delay request time; judging whether the delay request message needs to be processed first according to the delay request time; and determining that the delay request message needs to be processed first , the delay request message is processed in a priority processing manner. The present invention can be used in the processing technology of delayed request.

The invention relates to a method for improving the touch accuracy of an infrared touch screen. Two sets of scanning lines with different inclination angles are used, and the number of areas where each set of scanning lines is blocked by a touch point is determined according to the situation that each set of scanning lines is blocked by a touch point. The one with the larger number of occluded areas in the two groups of rays is selected as the actual number of touch points, so as to avoid the situation that two touch points are mistaken for one touch point. And after determining the start boundary and end boundary of each touch point according to the situation that the first group of scan lines is blocked, and then combining the width value of each touch point determined according to the situation that the second group of scan lines is blocked, determine two The initial border and termination border of each touch point separate the two touch points, solve the problem of merging two touch points due to insufficient scanning distance, and improve the touch accuracy of the infrared touch screen.

The invention relates to a five-path laser radar for a vehicle and a control method of the five-path laser radar. The five-path laser radar comprises a radar controller, and five paths of transceivers in fan-shaped arrangement, wherein each path of transceiver respectively comprises a laser emitting lens tube and a laser receiving lens tube, the center axes of the five paths of transceivers are all crossed at the same point on the same plane, and in addition, the included angle between the adjacent laser emitting lens tubes is identical. When the five-path laser radar is used, the five paths of transceivers are firstly controlled for sequentially emitting and receiving laser pulses, the interval time is identical, then, the passing time t between the emitting and the receiving of each path of laser pulses is calculated, next, the t is subjected to twice screening through a formula that t is greater than or equal to t and smaller than or equal to 1mus and the variance, the threshold and the circulation number group, then, the qualified t average value in the cyclic number group is calculated, and finally, the region of obstacles, the distance between the obstacles and the vehicle and the relative speed are determined according to the average value, so obstacles are avoided. The design has the advantages that the scanning period is short, the structure is simple, in addition, the cost is lower, the anti-shock performance is higher, and the detection distance, the range and the precision can meet the vehicle requirements.

The invention provides a touch positioning method and device for an infrared touch screen. Divergent scanning is performed on the infrared touch screen in a first direction to obtain all areas under scanning which are to be further scanned in a second direction, wherein each scanning area includes a quasi-touch area; all the areas under scanning are scanned at a preset scanning angle in the seconddirection to obtain real touch areas, wherein the first direction is perpendicular to the second direction. Scanning in the second direction only requires scanning all the areas under scanning with no full scanning required, and therefore, the scanning period can be shortened.