摘要:
A semiconductor integrated circuit having therein a plurality of memories, realizing an improved yield by efficiently repairing a defective bit in a memory. This semiconductor integrated circuit has: a plurality of circuit blocks (RAM macro cells) each having an identification code coincidence detecting circuit for determining whether an input identification code coincides with a self identification code or not and a reception data latch and performing an operation according to latched data; a setting circuit capable of setting the identification code and information corresponding to the identification code and serially outputting the set information; and a control circuit capable of sequentially reading the setting information from the setting circuit, converting the setting information to parallel data, and transferring the parallel data to the plurality of circuit blocks. Each of the plurality of circuit blocks captures and holds the setting information transferred when the identification code coincidence detecting circuit determines that the input identification code and the self identification code coincide with each other.
摘要:
In a photodetector, the minimum size of the photodetection area for detecting a focus error signal from a light beam on the inner radius side of a hologram is made smaller than the minimum diameter of diffracted light beam spots (30, 31) for recording and reproduction, and when a CD is reproduced, a light beam close to the optical axis is made to significantly contribute to the focus error signal and the minimum size of the photodetection area for detecting the focus error signal from a light beam from the peripheral side of the hologram is made larger than the minimum diameter of diffracted light beam spots (130, 131) for recording and reproduction, whereby the focus error signal is made equal to the normal focus error signal when a DVD is reproduced, so that the focus offset variation caused when the base material thickness varies can be reduced.
摘要:
A disk playback apparatus such as a CD player comprises a case and a lift unit which is supported to be movable in the vertical direction to the case. The lift unit comprises a playback unit, a turntable, a holder drawing member, and the like. A magazine which is adapted to be loaded in the case accommodates therein disk holders, each of which hold one of different-sized disks. A control link having a holder butting pin and a disk control pin is movably mounted on the playback unit which is urged in the direction of departing from the disk by means of a release spring. When the disk holder reaches its accommodation position, the disk holder butts against the holder butting pin and rotates the control link slightly, thereby the disk control pin compulsively corrects the position of the disk. Thus the disk is certainly transported to the normal chucking position on the playback unit irrespective of the disk accommodated state in the disk holder.
摘要:
A disk changer device is provided which is capable of maintaining continuity of control, small, and simple, by means of perpetually maintaining a 1-to-1 correspondence relation between the direction of rotation of the driving source and the direction of operation of the disk holding member. A loading unit 40 comprises a transporting plate 43 for transporting disk holding members 11, a chucking plate 44 for driving a drive plate 72 and clamp arm 73, a driving block 45, and so forth. The driving block 45 is provided with a loading pinion 50 which rotates according to the output of a loading motor 47. While the transporting plate 43 makes one reciprocal movement to perform extracting returning operation of the disk holding member 11 by certain rotation control of the loading pinion 50, via the rack 43a, the loading gear 54 is rotated 180° and the chucking plate 44 is driven on the going path or the returning path to perform chucking operation or chucking disengagement operation.
摘要:
A recording information reproducing apparatus which can precisely reproduce a digital signal from any one of a plurality of kinds of recording disks of different recording densities. A recording density of a recording medium as a reproduction target is detected and an amplitude of a high frequency component of a read signal read out from the recording medium is increased by a gain according to the detected recording density.
摘要:
A memory device has a ferroelectric memory cell block, which is connected via an input/output latch buffer to a data input terminal. The memory device also has a writing period forming circuit that forms a predetermined number of writing periods when writing of data is requested. During the thus formed plurality of writing periods, a control circuit controls the input/output latch buffer to write data to the memory cell block. Thus, a single request for writing of data causes writing of data to be repeated a plurality of times automatically.
摘要:
An apparatus and a method for aiding the transmission of intent enables a severely physically-handicapped person, who has lost muscular energy due to amyotrophic lateral sclerosis (ALS), muscular dystrophy or the like, to transmit his/her intent through an electroencephalogram wave. A mechanical switch and an electroencephalogram wave switch are used in combination to allow the transmission of intent over the entire period of such a disease.
摘要:
A branchmetric calculation circuit in a Viterbi decoder capable of fast decoding with a small circuit scale. Square calculation for deriving a square of a subtraction result value between a received sample value and a predicted sample value is performed by broken line approximation using a plurality of linear functions.
摘要:
An optical disc of a sampled servo tracking method excludes unnecessary interference to wobbled pits of the servo area, whereby a tracking servo can be stably performed, a high density maintained, and a large recording capacity obtained. An optical disc in which a circular recording area comprising a plurality of concentric tracks or a spiral recording track which hold information signals including sync signals is divided into a plurality of zones bounded by circular boundary areas. The recording track is constituted by a plurality of sectors each comprising servo areas and data areas, the servo areas being located along straight lines in radial directions within the zone. The track pitch of the boundary area is made larger than the track pitch within the zone.
摘要:
An optical disk player utilizes an analog read signal generated from a pickup. The analog read signal is converted to a digital read signal consisting of a plurality of bits in synchronism with a sampling clock in an A/D converter. The digital read signal is then decoded in a decoder and decoded data are generated. An error signal according to the difference between an actual rotational speed of the optical disk and a specified speed is generated on the basis of the digital read signal generated from the A/D converter or the decoded data generated from the decoder. And a rotational speed of a spindle motor is controlled in accordance with the error signal.