Abstract: A wireless power transmission apparatus includes: a transmitter that wirelessly transmits electric power; and a receiver that can receive, in a resonant relation with the transmitter, a transmission signal including the electric power transmitted from the transmitter, wherein the receiver includes a frequency variable unit that can change a reception resonant frequency; a detecting unit that detects reception power; and a control unit that controls the frequency variable unit to perform frequency adjustment such that the reception power detected by the detecting unit is maximized.

Abstract: A wireless power transmission apparatus includes: a transmitter that wirelessly transmits electric power; and a receiver that can receive, in a resonant relation with the transmitter, a transmission signal including the electric power transmitted from the transmitter, wherein the receiver includes a frequency variable unit that can change a reception resonant frequency; a detecting unit that detects reception power; and a control unit that controls the frequency variable unit to perform frequency adjustment such that the reception power detected by the detecting unit is maximized.

Abstract: A wireless power transmission apparatus includes: a transmitter that wirelessly transmits electric power; and a receiver that can receive, in a resonant relation with the transmitter, a transmission signal including the electric power transmitted from the transmitter, wherein the receiver includes a frequency variable unit that can change a reception resonant frequency; a detecting unit that detects reception power; and a control unit that controls the frequency variable unit to perform frequency adjustment such that the reception power detected by the detecting unit is maximized.

Abstract: A wireless power transmission apparatus includes: a transmitter that wirelessly transmits electric power; and a receiver that can receive, in a resonant relation with the transmitter, a transmission signal including the electric power transmitted from the transmitter, wherein the receiver includes a frequency variable unit that can change a reception resonant frequency; a detecting unit that detects reception power; and a control unit that controls the frequency variable unit to perform frequency adjustment such that the reception power detected by the detecting unit is maximized.

Abstract: A wireless power transmission apparatus includes: a transmitter that wirelessly transmits electric power; and a receiver that can receive, in a resonant relation with the transmitter, a transmission signal including the electric power transmitted from the transmitter, wherein the receiver includes a frequency variable unit that can change a reception resonant frequency; a detecting unit that detects reception power; and a control unit that controls the frequency variable unit to perform frequency adjustment such that the reception power detected by the detecting unit is maximized.

Abstract: A recording/reproducing apparatus includes an encoding section, a decoding section, and a first judging section. The encoding section is configured to encode data that is to be recorded onto a recording medium into an LDPC (Low Density Parity Check) code. The decoding section is configured to decode the LDPC code read out from the recording medium. The judging section is configured to judge a block with a recording error based on one of a block error flag and an iterative decoding count output from the decoding section.

Abstract: Scanning rate in a capacitance change measuring circuit for a capacitive sensor device is enhanced. The circuit includes: an electrode drive section line-sequentially applying an input pulse signal to a plurality of columns of first electrode patterns in the capacitive sensor device; a peak hold circuit storing a peak level of a detection signal extracted from each column of second electrode patterns into a capacitive element as a corresponding potential; a current source initializing the potential in the capacitive element within one period of the input pulse signal; a comparator comparing the potential in the capacitive element with a reference value; and determination sections each determining whether or not an input operation using a human body or the like is executed, based on a timing information and a reference timing information, the timing information representing a timing when the potential held in the capacitive element crosses the reference value.

Abstract: A wireless power transmission apparatus includes: a transmitter that wirelessly transmits electric power; and a receiver that can receive, in a resonant relation with the transmitter, a transmission signal including the electric power transmitted from the transmitter, wherein the receiver includes a frequency variable unit that can change a reception resonant frequency; a detecting unit that detects reception power; and a control unit that controls the frequency variable unit to perform frequency adjustment such that the reception power detected by the detecting unit is maximized.

Abstract: Scanning rate in a capacitance change measuring circuit for a capacitive sensor device is enhanced. The circuit includes: an electrode drive section line-sequentially applying an input pulse signal to a plurality of columns of first electrode patterns in the capacitive sensor device; a peak hold circuit storing a peak level of a detection signal extracted from each column of second electrode patterns into a capacitive element as a corresponding potential; a current source initializing the potential in the capacitive element within one period of the input pulse signal; a comparator comparing the potential in the capacitive element with a reference value; and determination sections each determining whether or not an input operation using a human body or the like is executed, based on a timing information and a reference timing information, the timing information representing a timing when the potential held in the capacitive element crosses the reference value.

Abstract: A recording/reproducing apparatus includes an encoding section, a decoding section, and a first judging section. The encoding section is configured to encode data that is to be recorded onto a recording medium into an LDPC (Low Density Parity Check) code. The decoding section is configured to decode the LDPC code read out from the recording medium. The judging section is configured to judge a block with a recording error based on one of a block error flag and an iterative decoding count output from the decoding section.

Abstract: Processing wherein a measurement signal and an erasure signal are recorded on adjacent tracks of a recordable tape 10 by one recording head HWi of n (i=1 to n) recording heads is effected on n recording heads, and measurement signals are recorded on n tracks substantially simultaneously by n recording heads HW1 to HWn in standard operation state. Then, reproducing heads with respect to thus obtained two kinds of tracks are displaced in track width directions, characteristic curves of reproduced signal waveform amplitudes of measurement signals displacement (off-track) amounts of tracks are obtained, half widths of these characteristic curves are assumed to be expedient track width and a variable Ri optimum and a variable Ri now corresponding to track widths of two kinds of tracks are obtained. Then, deviation between the variable Ri optimum and the variable Ri now is adjusted to become smaller than a desired value.

Abstract: The present invention is directed to a recording/reproducing apparatus having a Read After Write function which simultaneously performs recording operation and reproduction operation, and is such that, in a reproducing system (120) of a tape streamer (100) which performs Read After Write operation for signals through a magnetic tape (105), the apparatus serves to distribute reproduction signals obtained from the magnetic tape by a first data distribution switch (133) to store signals thus distributed into frame memories (135A), (135B) of 2 channels, and to distribute a recording signal from a recording system (110) by a second data distribution switch (134) as cause signals of crosstalk signals included in reproduction signals to store signals thus distributed into frame memories to generate pseudo crosstalk signals of respective channels by crosstalk cancellers (136A), (136B) on the basis of reproduction signals and cause signals of respective channels which are read out from the frame memories to cancel, ev

Abstract: Processing wherein a measurement signal and an erasure signal are recorded on adjacent tracks of a recordable tape 10 by one recording head HWi of n (i=1 to n) recording heads is effected on n recording heads, and measurement signals are recorded on n tracks substantially simultaneously by n recording heads HW1 to HWn in standard operation state. Then, reproducing heads with respect to thus obtained two kinds of tracks are displaced in track width directions, characteristic curves of reproduced signal waveform amplitudes of measurement signals displacement (off-track) amounts of tracks are obtained, half widths of these characteristic curves are assumed to be expedient track width and a variable Ri optimum and a variable Ri now corresponding to track widths of two kinds of tracks are obtained. Then, deviation between the variable Ri optimum and the variable Ri now is adjusted to become smaller than a desired value.

Abstract: A signal-processing circuit in which two-stage equalization is performed by using first and second equalization circuits provided on upstream and downstream sides from a phase-locked loop circuit, respectively, the first equalization circuit on the upstream side including a transversal filter to minimize an equalization error caused by the first equalization circuit and to stabilize the operation of the phase-locked loop circuit. Another signal-processing circuit including an analog-to-digital converter and a digital phase-locked loop circuit for receiving the output from the analog-to-digital converter and a recording and playback apparatus using the output are also provided, wherein the output from the analog-to-digital converter is input as the digital signal in the digital phase-locked loop circuit to fetch a detection point voltage and to stabilize the phase-locked loop circuit without an analog circuit.

Abstract: A magnetic head mounted on a rotary head drum device comprises a head chip, and a magnetic shield disposed to surround all or a part of the surfaces other than a front surface of the head chip. The magnetic shield comprises a magnetic flux absorber made of ferrite and an electromagnetic wave shield made of copper. This enables a reduction of the amount of unnecessary magnetic fluxes and electromagnetic waves jumping away from the recording head to the reproducing head. Simultaneously, the magnetic flux absorber absorbs the magnetic flux coming from outside to the reproducing head before the magnetic flux reaches the head chip and the electromagnetic wave shield shields a high frequency electromagnetic wave which was not absorbed by the magnetic flux absorber 80 that it is possible to reduce the amount of the magnetic flux or the like jumping into the reproducing head and to improve the S/N of the reproduced signal.

Abstract: There is provided a recording/playback apparatus including a playback system which reproduces data by digitizing a playback signal from a magnetic tape (140) and extracting a channel clock from the digitized playback signal. In the recording/playback apparatus, a crosstalk canceller (130) is provided upstream of a PLL circuit (127) which extracts a channel clock from read RF data resulted from digitization of the playback signal from the magnetic tape (140). The crosstalk canceller (130) includes a subtraction circuit (131) supplied with the read RF data, and an adaptive filter (132) which generates a pseudo recording signal crosstalk from recording data supplied from a recording system (110) as a signal causing a crosstalk signal included in the playback signal from the magnetic tape (140) and output data from the subtraction circuit (131). The pseudo recording signal crosstalk signal generated by the adaptive filter (132) is supplied to the subtraction circuit (131).

Abstract: The present invention is directed to a recording/reproducing apparatus having a Read After Write function which simultaneously performs recording operation and reproduction operation, and is such that, in a reproducing system (120) of a tape streamer (100) which performs Read After Write operation for signals through a magnetic tape (105), the apparatus serves to distribute reproduction signals obtained from the magnetic tape by a first data distribution switch (133) to store signals thus distributed into frame memories (135A), (135B) of 2 channels, and to distribute a recording signal from a recording system (110) by a second data distribution switch (134) as cause signals of crosstalk signals included in reproduction signals to store signals thus distributed into frame memories to generate pseudo crosstalk signals of respective channels by crosstalk cancellers (136A), (136B) on the basis of reproduction signals and cause signals of respective channels which are read out from the frame memories to cancel, ev

Abstract: A magnetic head mounted on a rotary head drum device comprises a head chip, and a magnetic shield disposed to surround all or a part of surfaces other than a front surface of the head chip. The magnetic shield comprises a magnetic flux absorber made of ferrite and an electromagnetic wave shield made of copper. This enables reduction of the amount of unnecessary magnetic fluxes and electromagnetic waves jumping away from the recording head to the reproducing head. Simultaneously, the magnetic flux absorber absorbs the magnetic flux coming from outside to the reproducing head before the magnetic flux reaches the head chip and the electromagnetic wave shield shields a high frequency electromagnetic wave which was not absorbed by the magnetic flux absorber so that it is possible to reduce the amount of the magnetic flux or the like jumping into the reproducing head and to improve the S/N of the reproduced signal.

Abstract: A signal-processing circuit in which two-stage equalization is carried out by using first and second equalization circuits provided on the upstream and downstream sides from a phase locked loop circuit, respectively, is provided, wherein the first equalization circuit on the upstream side from the phase locked loop circuit is composed of a transversal filter, to minimize an equalization error caused by the first equalization circuit, thereby stabilizing the operation of the phase locked loop circuit.

Abstract: An NLTS (non-linear transition shift) correction circuit for hard disk drives improves flexibility in modifying algorithm of the data pattern analysis utilized therein and NLTS correction precision thereof. The NLTS correction circuit of the present invention uses a data pattern analyzer including a CPU and a data pattern analysis program. Selector control signals produced by this analyzer are stored in a selector control signal buffer memory and are output to a selector in synchronization with the output from a data buffer memory. The pattern of data to be recorded can be analyzed while flexibly responding to the fluctuations in the characteristic of the recording medium by modifying the analyzing program. Moreover, the difference in the amount of delay between the delay lines can be calibrated by adding a circuit for calibrating the NLTS correction value, which includes a circuit that converts the duty cycle of the record data signal to voltage value.