摘要:
An apparatus for reproducing data includes a branch metric computation unit and a plurality of parallel computation units, each of which includes path metric computation units configured to compute path metric values based on branch metric values, path metric memories operable to store the path metric values to be used in a next following path metric computation, reliability computation units configured to compute path reliability, and modified-path generating units configured to generate an inverted path that is inverse to a path indicated by an output of the reliability computation units as having low reliability, wherein if any one of the modified-path generating units generates the inverted path, a corresponding one of the path metric computation units stores a path metric value corresponding to the inverted path in a corresponding one of the path metric memories as a path metric value to be used in a next following path metric computation.
摘要:
The present invention realizes stable and more proper data reproduction even when a reproduced signal varies locally due to a noise or includes a steady distortion. In a data reproduction control method and apparatus, and an optical disk unit that adjust sampled values, in sampling a signal reproduced from a recording medium recorded with data, the frequencies of the levels of quantized data are counted, a histogram of the frequencies of the levels is created based on the counting results, and more accurate reproduced data is obtained by means of a distribution of the frequencies of the levels in the histogram.
摘要:
A data reproduction system, which determines reproduced data based on comparison results of path metrics calculated in accordance with a Viterbi algorithm based on branch metrics calculated from expected values and a sampled value of a readout signal, includes an expected value setting unit for variably setting the expected values used for a calculation of the branch metrics in order to perform a Viterbi detection process without being easily affected by the transient response, offset variation, phase error and nonlinear torsion component of the readout signal. The readout signal is obtained from a recording medium on which data is recorded in accordance with a recording signal of a partial response waveform, the expected values are determined by the partial response waveform, and the sampled value is obtained by sampling the readout signal at a predetermined frequency.
摘要:
A clock matching apparatus for a data reproduction system includes a phase error detection unit which detects a phase error of a clock signal based on samples of a readout signal output by a sampler of the data reconstruction system. A phase-locked loop supplies a phase-matched clock signal to the sampler by compensating for the phase error detected by the phase error detection unit. The phase error detection unit includes an edge detection unit which detects a sampling instant for an edge sample among the samples of the readout signal. A difference unit generates a difference in timing phase between the edge sample and a sync level, the sync level being a reference signal level corresponding to a level of the readout signal at the sampling instants thereof and defined based on a partial-response waveform, the difference in the timing phase being output to the phase-locked loop as the detected phase error.
摘要:
A cylinder injection type fuel control system for an internal combustion engine ensuring normal ignition and combustion of air fuel mixture while effectively utilizing two-stroke fuel injection includes sensors (1) for generating a variety of information concerning operation state of the internal combustion engine an engine operation state detecting device (11) for detecting an engine operation state (D) on the basis of the various information and fuel injectors (2) disposed so as to inject fuel directly into a combustion chamber of each engine cylinder. An injection mode setting device (12A) selectively sets a fuel injection mode (M) to either a one-stroke fuel injection mode or a two-stroke fuel injection mode in dependence on the engine operation state. An injector driving device (13) drives the fuel injectors (2) in accordance with the selected fuel injection mode. An engine operation state information storing device (14) stores preceding engine operation state information as operation history information of the engine before current operation is started. The injection mode setting device (12A) selectively sets a current fuel injection mode in succession to the engine starting on the basis of the preceding engine operation state information (Dp). When the preceding engine operation state information does not satisfy a predetermined operating condition representing a sufficiently heated state of spark plug within the combustion chamber, the two-stroke fuel injection mode is inhibited from being validated.
摘要:
A hydraulic tensioner which has a small number of components and hence can be reduced in size. The hydraulic tensioner includes a plunger 3 slidably fitted in a cylinder disposed in a tensioner body, a reservoir chamber formed in the tensioner body in a lower portion of the cylinder, a check valve permitting flow of an oil in a single direction from the reservoir chamber into the cylinder which is formed as a high pressure chamber, a low pressure chamber formed in the tensioner body exteriorly of the cylinder, an oil passage connecting a bottom of the low pressure chamber to a position between the check valve and the reservoir chamber, and a spring urging the plunger upwardly, wherein the low pressure chamber contains an air layer formed above a surface of the oil held in the lower pressure chamber. The oil passages and check valve enable the oil to flow into the high pressure chamber in a short time and hence efficiently dampen vibrations of the plunger.
摘要:
An alternator power supplied electric heater is Where the resistence of a resistive heater element 3, consumed power and amount of consumed power are calculated from noncontrolled characteristics of an alternator 2, and supply of power to the resistive heater element 3 is controlled based on water temperature of engine WT to heat catalyst 11b to a predetermined temperature.
摘要:
An alternator power-supply type electric heating control apparatus, comprising (1) a switch for switching an output of an alternator including a field coil, a stator coil, and a rectifier to a first state where the output is connected to a battery and vehicle-mounted electrical load side or a second state where the output is connected to an object to be heated which is heated by current conduction; (2) a controller which performs an output control of the alternator by a duty control of a field current that is supplied to the field coil, performs the switching of the switch, detects a failed state, and causes a display unit to display the failed state to warn a driver; and (3) an object to be heated voltage control unit for controlling the duty control of the field current by a rectification wave of one phase of an output voltage of the alternator, rectified by the rectifier, so that a voltage of the object to be heated does not exceed a predetermined value.
摘要:
An improved wear resistant toothed belt for enhancing the service life of such belt against chipping of the teeth of such belt such toothed belt having stretching members disposed at the center portion thereof, a tooth portion and a back portion, the tooth surface of the tooth portion being covered with a tooth cloth impregnated with an RFL solution and further impregnated with a rubber paste, the rubber paste containing carbon in an amount of 10 phr or less relative to polymer, the amount of solid content of the RFL solution stuck on the tooth cloth being in the range of 3 to 20 wt % relative to the weight of the tooth cloth, and the amount of the solid content of the rubber paste stuck on the tooth cloth is in the range of from 6 to 18 wt % relative to the weight of the tooth cloth.
摘要:
The present invention provides genes and proteins having possibilities to generate plants having tolerance against excessive boron, which can confer a boric acid tolerance to organisms. 5 types of genes that can confer a boric acid tolerance to yeast, such as AtPAB2, AtRBP47c′, AtRPS20B, AtMYB13 and AtMYB68, AtRBP45a, AtRBP45b, AtRBP45c, AtRBP45d, AtRBP47a, AtRBP47b, AtRBP47c, AtUBP1a, AtUBP1b and AtUBP1c which were found by expressing several genes of higher plant Arabidopsis thaliana in yeast that is a organism model of eukaryote. Further, a key to the toxicity mechanism of boric acid exists in the specific inhibition of splicing, and a gene related to enhancement of splicing efficiency also confers a boric acid tolerance.