摘要:
In a wireless communication system dealing with a plurality of frequency bands such as 5.2 GHz band and 2.4 GHz band, without a disturbance from another wireless communication system or the like and abnormalities such as stop of a moving picture and disturbance of a picture, a large volume of data can be securely and smoothly transmitted on real time basis. In a frequency band (5.2 GHz band) communicable at higher transmission rates, unused radio channels free of a disturbing wave are detected in steps 101 to 103. In process routine 200, it is detected whether or not received field strengths exceed a threshold value in decreasing order from higher transmission rates on the detected radio channels. A communication is started at a transmission rate of which the received field strength reaches or exceeds the threshold value.
摘要:
An optical head is fed to the innermost area of an optical disk, and then fed to the outside while a detector circuit measures the frequency of a read signal supplied from the optical head. When the frequency of the read signal changes to high frequency, a tracking servo is performed, and the read signal is analyzed to acquire positional information during the tracking servo operation. The tracking servo operation is disabled, and the optical head is fed to a target position based on the positional information.
摘要:
A track jump control apparatus for a disc reproducing system having a transport unit for moving a pickup element that reads data recorded on the disc in the radial direction of the disc at a high speed. The system also has a detecting unit for detecting a moving direction of the pickup element unit based on a pick-up signal output from the pickup element while the pickup element moves in the radial direction of the disc, and a protection unit for stopping the pickup element moved by the transport unit when the pickup element is judged to be moving in a different direction from the direction moved by the transport unit. The apparatus has a measuring unit for measuring a pulse duration of the picked-up signal, which is continuously obtained from the pickup element while the pickup element moves in the radial direction of the disc at a high speed. The apparatus also has a control unit for inverting a detected result of the detecting unit when the pulse duration of the picked-up signal is beyond a specific limit based on the measured result of the measuring unit.
摘要:
A drive speed detector for a pickup feed motor including a detector for detecting the drive speed of the optical pickup feed motor by generating an AC signal with a frequency which is proportional to the drive speed of the optical pickup feed motor and a controller for controlling the sensitivity of the detecting means in order to uniform an amplitude level of the AC signal output from the detecting means.
摘要:
In an automatic focusing circuit of a video camera, automatic focusing operation is performed by a focus evaluating value formed in response to a video signal obtained by an image sensing circuit (4). A first focusing motor control circuit (15) controls the rotation of a focusing motor (3) so that a focusing lens (1) is once fixed in the position where the focus evaluating value takes the maximum value. A second focusing motor control circuit (17) changes the focusing motor (3), by a predetermined very small amount, to determine the slope of the focus evaluating value, which change is repeated until inversion of the slope, that is, the maximal point is detected. As a result, the position of the focusing lens is corrected at the maximal point of the focus evaluating value. When the correction amount exceeds a predetermined value, first automatic focusing operation by the first focusing motor control circuit (15) is resumed.
摘要:
A protocol converting apparatus in which when character information electronic signals of a NAPLPS (North American Presentation Level Protocol Syntax) system are displayed on a user terminal apparatus of a CAPTAIN (Character And Pattern Telephone Access Information electronic signal Network) system, the overflow condition in a row direction and the overflow condition in a column direction are detected and in which in the case of the overflow condition in a column, an overflow character information electronic signal is temporarily stored in a memory, whereby the NAPLPS character information electronic signal can be used by all user terminals of the CAPTAIN system.
摘要:
A tracking control system for an optical disc information reproducing apparatus in which information stored in an optical disc as a series of recesses or pits arranged in concentric tracks or in a single spiral track is read out during rotation of the optical-disc by a scanning spot of a light beam, the system comprising a light source for generating the light beam used for scanning the track, means for applying the scanning spot of the light beam to a selected track location, a transducer for converting an optical signal detected by the scanning spot into an electric signal bearing a tracking error information, means for controlling the scanning spot applying means in response to the tracking error information signal, thereby causing the scanning spot to scan the selected track location accurately, means for transferring the tracking error information signal to the controlling means, a transfer characteristics of the transferring means being variable, means for limiting a slew rate of the tracking error information signal, means for subtracting an output of the slew rate limiting means from the tracking error information signal, and means for lowering the transfer characteristics of the controlling means in response to an output of the subtracting means, thereby causing the controlling means being irresponsive to the tracking error information signal.
摘要:
A tracking servo system for an optical-disc information reproducing apparatus includes (a) a light source for generating a light beam to scan a target track on an optical-disc wherein the information is stored as a series of pits arranged in the form of the track; (b) four photodetectors, arranged in two pairs with each pair intersecting the other and being disposed in a direction oblique to an image of the track for converting an image of the pit into respective electric signals; (c) a circuit for comparing the phases of the electric signals and for producing a tracking error signal ranging in accordance with the phase difference between the electric signals; and (d) a motor and lens for deflecting the light beam along a path perpendicular to the target track in response to the tracking error signal, whereby the light beam accurately scans the target track.
摘要:
A processing machine is configured to include a processing device capable of applying processing for forming many holes to a processing area as a part of a region to be processed in a workpiece, a transferring device to relatively move the workpiece with respect to the processing device after the processing is applied to a certain area in the region to be processed, and to position an unprocessed area as a new area to be processed by the processing device, a processing pattern storage unit to store information defining arrangement positions of the holes formed by the processing device, and a control unit to determine a target processing position of each of the holes by adding a position correction amount of each hole on a random basis to the position of each hole defined by the information stored in the processing pattern storage unit.
摘要:
A compound useful as a plant activator for activating an endogenous defense system of a plant to control disease damage is provided. A compound represented by the formula: (R3)NH—(CH2)4—N(R1)—(CH2)3—NH(R2) (one of R1 and R2 represents a linear C6-18 alkanoyl group or alkenoyl group, the other represents hydrogen atom or a protective group of amino group; and R3 represents hydrogen atom or a protective group of amino group).