摘要:
The present invention provides an optical recording medium capable of detecting groove start signals and groove end signals with an inexpensive detection circuit and allowing quick, stable clock detection and tracking pull-in, which optical recording medium is constructed in such a way that the depth DG of the grooves satisfies DG/(λ/N) 1.2 FWHM, where FWHM is a full width at half maximum of the light beam in the track direction.
摘要翻译:本发明提供了一种能够利用便宜的检测电路检测凹槽起始信号和凹槽结束信号并允许快速,稳定的时钟检测和跟踪拉入的光学记录介质,该光学记录介质被构造成使得深度D 沟槽的G'满足D&lt; N /(λ/ N)<0.16,其中λ是光束的波长,N是衬底的折射率, 并且槽边缘和最接近其的凹坑之间的距离L S s满足L S S / S 2 1.2 FWHM,其中FWHM是光束的半高的全宽 轨道方向。
摘要:
To provide an optical recording medium and an eccentricity amount detecting device using the same that can detect an eccentricity amount representing a relative displacement amount in a radiation direction between a beam spot irradiated onto the optical recording medium and the optical recording medium. In the optical recording medium, a plurality (N) of servo areas (113) each including a first wobble mark (211) and a second wobble mark (212) and a plurality (N) of data areas for performing information recording and reproduction are arranged alternatively in a circumferential direction. Each of the servo areas is composed of a plurality of servo pattern areas (210a to 210c) arranged in the radial direction, which vary in a distance in the circumferential direction between the first wobble mark and the second wobble mark. The plurality of servo pattern areas include the same number of tracks, and the number is less than N/(2×π).
摘要:
There is provided a reproduction apparatus which acquires information concerning a program digest, which is created by a third party, and performs a digest reproduction of a recorded program based on this information, while taking into consideration factors such as unreproduced portions of the recorded program and the amount of time which a user can spend for viewing, for example. From a recording/reproduction processing section (24), a digest information management section (27) acquires information concerning a recording process and a reproduction process, and based on such information, generates predetermined program recording information and predetermined program reproduction history information. From a server (40) on a network (30), the digest information management section (27) acquires server digest information which is previously stored therein. The program recording information, the program reproduction history information, and the server digest information are recorded on the hard disk (25) and kept under management therein. From such information, the digest information management section (27) generates predetermined user digest information, and, in accordance with this user digest information, provides the user with information concerning a digest reproduction of the recorded program.
摘要:
A brushless DC motor detects a positional relationship between the rotor and the stator windings in a short period of time when starting the motor and immediately switches the mode from a phase coincidence mode at the time of starting to a normal position detecting mode performed by counting output pulses in response to the rotational speed of the rotor. The motor detects a position of the rotor at an extremely high accuracy independently of the magnitude of the load even when the motor has already been subjected to the application of such a load at the time of starting. The motor is always driven at a high efficiency by applying a phase correction process so as to cause the phase of each of the voltages respectively induced in the stator windings to coincide with the corresponding one of the driving currents respectively outputted to the stator windings when the motor is being rotated normally.
摘要:
Disclosed is a speed controller of a motor which comprises a rotation sensor for generating an A.C. signal having a period in accordance with a rotating speed of a motor; speed detection device for effecting detection operations a plurality of times per round of the motor by the A.C. signal of the rotation sensor; compensation device for generating a control signal on the basis of a detection signal of the speed detection device; and driving device for driving the motor in accordance with the control signal of the compensation device; wherein the compensation device includes rotation error detection device for obtaining a rotation error responsive to the detection signal of the speed detection device; memory device for storing a memory value; memory output value generation device for generating a memory output value by the use of the memory value of the memory device; filter device for obtaining a calculation error from the rotation error; renewing and storing device for renewing and storing substantially sequentially the memory value of the memory device by a renewed value corresponding to a value obtained by calculating and synthesizing the calculation error and the memory output value whenever the speed detection device effects Q times detection operations; and control signal generation device for generating a control signal responsive to the rotation error of the memory output value.
摘要:
A control system has a detecting block for obtaining a detected signal corresponding to a controlled variable of a controlled system, and a controlling block for supplying the controlled system with a control signal according to the detected signal. The controlling block includes an error signal producing block for producing an error signal from the detected signal at intervals of a detecting period of time, a memorizing block for storing a plurality of memorized values corresponding to the error signal, and a control signal producing block for producing the control signal by mixing the error signal with one or more of the memorized values. The memorizing block renews the memorized values sequentially and periodically at intervals of a renewing cycle period of time proportional to the detecting period, each with a mixed value computed from the error signal and one or more of the memorized values having been renewed at intervals of L renewing cycle periods, where L is an integer at least equal to 2. The controlling block also includes an operation selecting block for selecting a control operation, and a position detecting block for detecting a physical movement of the controlled system. The position detecting block obtains a stored position of the memorized value corresponding to a physical position of the controlled system so as to utilize the memorized values promptly and correctly when the operation selecting block selects the control operation using the memorizing block.
摘要:
Via a mobile communication network, a transmission apparatus receives position information representing a current position of a reception apparatus. Based on the received position information, the transmission apparatus generates notice data indicating that it is necessary to correct preprogrammed program information identifying a program which has been preprogrammed for viewing or preprogrammed for recording and being generated at the reception apparatus, and transmits the generated notice data to the reception apparatus. Accordingly, a transmission apparatus is provided which generates information that allows preprogramming of a broadcast program for viewing or recording to be properly performed at the reception apparatus side, or which generates a correct broadcast program table, and transmits the generated information or program table to the reception apparatus.
摘要:
A data distribution system is provided which generates outputs attribute data about multimedia data in advance and broadcasts the output attribute data together with the multimedia data so that the receiving terminal can grasp the outlines of the entire multimedia data and improve the visibility. A data broadcasting device (1) generates output attribute data about multimedia data in a data analyzing portion (13). The output attribute data exists alone or is embedded in the multimedia data. The multimedia data and the output attribute data are encoded in a protocol encoder (14) and broadcast from a transmitter (15). A receiving terminal device (2) receives the broadcast data in a tuner (21) and obtains the multimedia data and output attribute data in a tuner (21). When a data display portion (26) displays the obtained multimedia data, the output attribute data is referred to and information related to the multimedia data is displayed together with the multimedia data. A data analyzing portion (24) analyzes the multimedia data and extracts the output attribute data embedded therein.
摘要:
A tracking control apparatus for stable tracking lead-in of an optical disc which has wobble grooves as tracks, including: a signal detection unit that detects tracking error and wobble signals from an optical spot; a speed detection unit that calculates a relative moving speed between the optical spot and the tracks; a polarity judgment unit that judges that the optical spot is on a land if a wobble signal amplitude value is equal to or lower than a predetermined value in the vicinity of a zero-cross point; a moving direction judgment unit that, when the relative moving speed is within a predetermined range and the optical spot is on a land, judges a moving direction of the optical spot from a rise/decay direction of the tracking error signal; and a control unit that performs a tracking lead-in by reducing the moving speed, based on the moving speed and moving direction.
摘要:
The object of the present invention is to provide a semiconductor memory which executes executing multiple application programs and duplicating important data from one application program into another application program in security. An IC card (200) is one example of the semiconductor memory of the present invention, and executes executing multiple application programs. The IC card (200) includes: a memory area (331) for storing data relating to a library APL (301); a memory area (332) for storing data relating to a public pool APL (302); a security level setting unit (603) which identifies respective security levels of the library APL (301) and the public pool APL (302) for the data relating to these application programs, based on a criterion for identifying the security level of an application program for the data relating to it; and a data operation unit (608) which duplicates data A stored in the memory area (331) and stores the duplicated data A into the memory area (332), without taking the data A outside of the IC card (200), in the case where the relationship between the two security levels identified by the security level setting unit (603) meets a predetermined condition.