Renesas Technology Corp.

Taiyo Yuden Co., Ltd.

Microspace Corporation

Mitsubishi Denki Kabushiki Kaisha

Taiyo Yuden Corp.

Mamoru Sakamoto

Masato Tanaka

Toyohiko Yoshida

Yasuo Hosaka

Kazuo Asanuma

Junichi Shimamura

Akinobu Maekawa

Masato Hagiwara

Kenji Kamitani

Hidehumi Nakagome

Hidefumi Nakagome

An overflow suppression technique that is effective for avoiding degradation in image quality is provided. A fundamental waveform and detail is extracted out of an input RGB signal. A suppression gain generation unitgenerates a suppression gain from the extracted fundamental waveform. Multipliersandmultiply the detail and the fundamental waveform by the generated suppression gain, respectively. Then, an addercombines them together for a mixed output. Alternatively, equalization processing is performed as follows. A low frequency component fundamental waveform is obtained as a result of the passing of an input RGB signal through a low pass filter. A suppression gain is generated from the low frequency component fundamental waveform. Then, the input itself is multiplied by the suppression gain to obtain an output.

Video display apparatus and method, and signal processing circuit and liquid crystal backlight driver to be built therein

The present invention relates to a lamp lighting technique for lighting multiple lamps safely without luminance irregularities. The present lamp lighting circuit includes multiple closed loops wherein a predetermined number of lamps and the secondary windings of the predetermined number of transformers are connected serially. At least one of the primary windings of the transformers employed for each closed loop is connected to the primary winding of the transformer employed for another closed loop serially. Thus, current of the lamps included in the closed loop is made uniform, and also current is made uniform even between the closed loops by connecting the primary windings of the transformers serially. According to the present invention, with regard to serial connection of the primary windings of the transformers, even if the number of transformers is limited, current uniformity can be propagated to the entirety by subjecting closed loops to catenation consecutively.

Lamp lighting circuit and device, and lamp lighting apparatus and device

An interrupt controlling method is provided that is capable of executing an interrupt process while avoiding slowing-down in execution speed of a task process. When an interrupt request occurs while a task processing program is being executed, the task processing program is suspended and execution of an interrupt handler is started. By the interrupt handler, a plurality of breakpoints are set in an interrupt process-enabled area (R). Execution of the resumed task processing program soon reaches one of the plurality of breakpoints. Then, the microprocessor () suspends the execution of the task processing program and starts execution of a breakpoint handler. By the breakpoint handler, the interrupt process is executed, and thereafter, the settings of the breakpoints are cleared.

Setting breakpoint for postponed interrupt processing in subsequent area while executing interrupt-exclusive task area to avoid slow down

A program execution device with a small required memory storage capacity includes: a compressed code storing portion storing a code which has been compressed on a prescribed unit basis of a program described in a prescribed language; an expanding portion connected to the compressed code storing portion for expanding the compressed code stored in the compressed code storing portion; a code storing portion connected to the expanding portion for storing the code expanded by the expanding portion; and an interpreter portion connected to the code storing portion for interpreting and executing the expanded code.

Program execution device operating based on compressed code

This invention provides a stable power supply apparatus enabling the high speed response. Hitherto, it was necessary to secure both of the gain margin and the phase margin on the Bode diagram of the loop transfer function when the PID feedback control was carried out in the power supply apparatus. The form of the transfer function of the controller in the power supply apparatus of this invention is the same, but a set of coefficient values in the transfer function is completely different, and the controller secures only the phase margin without securing the gain margin. Furthermore, the transfer function of the controller indicates a part with an extreme decrease in the gain and a trap point in which the phase is sharply delayed on the Bode diagram. This is achieved by applying the integral element of the PID to a frequency range that is higher than the resonance frequency of the LC filter. As a result, the high speed response becomes possible without losing the stability. Moreover, there is no case in which difficulty as to the setting of the circuit constants rises.

Power supply apparatus

A flash memory includes a data bank having a plurality of banks, a merge bank, and an update data bank. A file system using the flash memory includes a unit storing update data corresponding to a data rewrite command into the update data bank, a unit selecting the latest update data for each block from update data stored in the update data bank when the update data bank becomes full, and a processing unit processing the latest update data. The processing unit includes a unit storing latest update data into a merge bank, a unit selecting data associated with the latest update data from the data bank to store the selected data into the merge bank, and a unit setting the merge bank as a new data bank.

File system including non-volatile semiconductor memory device having a plurality of banks

A data processor includes a hardware translator converting non-native code into a native code to a processor, a software translator converting non-native code into a native code to the processor by software, and a software interpreter sequentially interpreting a code that is non-native to the processor, and executing the interpreted code using a native code of the processor. The data processor includes a circuit selecting the hardware translator, software translator or software interpreter according to a predetermined criterion for operation.

Selective conversion to native code using hardware translator, software translator, and software interpreter

It is an object of the present invention to provide a method and an apparatus for driving a piezoelectric transformer capable of always driving with maximum conversion efficiency regardless of changes in the input voltage level, load and temperature, etc. The method and apparatus for driving a piezoelectric transformer of the present invention generate a time-varying sweep voltage through a sweep circuit at predetermined regular intervals, thereby changing the frequency of a drive signal output from a voltage control oscillator, at this time detect a phase difference between the voltage and current generated on the primary side of the piezoelectric transformer by a phase difference detector, and hold the sweep voltage corresponding to the timing at which a maximum value detector detects the maximum value by a sample-and-hold circuit, thereby controlling the frequency of the drive signal so that the phase difference between the voltage and current on the primary side of the piezoelectric transformer always becomes a maximum value.

Method and apparatus for driving piezoelectric transformer

A duplicate of a function code is created in a fast memory contiguous with a normal memory so that a CPU checks whether the duplicate is located in the fast memory when the function code is called; and a block containing a function code may be released so as to create therein a duplicate of a new function code.

Program execution system with efficient code duplication

A power source 1 and an operating circuit 4 incorporating a waveform generating circuit 5 for synthesizing composite wave W obtained by synthesizing a sine wave of primary oscillations and a sine wave of secondary oscillations of a Rosen-type piezoelectric transformer and an amplifying circuit 6 raises the voltage of the composite wave so that composite wave W' (having a waveform similar to that of W) is, as input voltage V.sub.in, supplied to the Rosen-type piezoelectric transformer PT. Thus, output voltage V.sub.out having greater output electric power and higher transmitting efficiencies as compared with output voltage which can be obtained from a conventional structure in which input voltage in a single oscillation mode is employed can be produced to load resistor R.sub.o.

Growing community of inventors

Tokyo, Japan

Mamoru Sakamoto