Asahi Kasei Kabushiki Kaisha

Nippon Precision Circuits Inc.

Kabushiki Kaisha Toshiba

Kazuyuki Fujiwara

Masaki Takahashi

Naoki Matsuoka

Hirokazu Kamine

Minoru Takeda

Akira Toyama

Takashi Nagayama

Tooru Saima

Hiroyuki Wakairo

To provide a non-aqueous electrolyte solution, a non-aqueous secondary battery, a cell pack, and a hybrid power system, capable of improving desired battery performance in an acetonitrile electrolyte solution, the non-aqueous electrolyte solution contains a non-aqueous solvent, POFanions, and cyclic acid anhydride.

Non-aqueous secondary battery

To provide a non-aqueous electrolyte solution, a non-aqueous secondary battery, a cell pack, and a hybrid power system, capable of improving desired battery performance using acetonitrile, the non-aqueous electrolyte solution contains acetonitrile, lithium salt, and cyclic acid anhydride.

Non-aqueous electrolyte solution, non-aqueous secondary battery, cell pack, and hybrid power system

Non-aqueous electrolyte solution

In a delta sigma type D/A converter, in order to be capable of carrying out muting operation in steps at steps lower than 1 quantized step by digital processing, a multiplexor for selectively outputting a mute code for making an analog signal null and a thermometer code to a local DAC is provided between a thermometer code converter and the local DAC a time period of 1/M of a sampling period is made to constitute 1 cycle, at m1 (0&lE;m1&lE;M) cycle, the thermometer code is made an output of the multiplexor and at other m2 (m2&equals;M&minus;m1) cycle, the mute code is made an output thereof and muting is carried out reducing the m1 cycle or muting is relieved by increasing thereof in steps at respective sampling period.

Delta sigma D/A converter

There is disclosed a variable-gain circuit forming resistors on a semiconductor substrate. The ratio of the total resistance to the minimum resistance is made smaller than heretofore. The circuit is miniaturized. The variable-gain circuit comprises an operational amplifier, a first set of resistors R1-Rn+1, a second set of resistors Rx1-Rxm, switches SW1-SWn and a control circuit. This control circuit closes only one of the switches SW1-SWn at all times.

Variable-gain amplifier circuit and attenuator circuit

In a waveform data reproducing apparatus for a digital audio system, deterioration of sound quality is prevented by a digital audio waveform data reproducing apparatus which includes a digital preemphasis circuit 12 for digitally preemphasis-processing digital audio waveform data a1 to produce digitally preemphasized data c1, a D/A converter 14 for D/A-converting either the waveform data a1, or the digitally preemphasized data c1, a switch circuit 13 for causing the waveform data a1 to be connected to the D/A converter 14 when the waveform data a1 has been emphasis-processed, and for causing the digitally preemphasized waveform data c1 to be connected to the D/A converter 14 when the waveform data a1 is not emphasis-processed, and an analog deemphasis circuit 14 for analogically deemphasis-processing the output signal from the D/A converter 14.

Apparatus for reproducing digital audio waveform data

The air-cooled type induction motor used for railway vehicles such as the electric car generates sound waves (noise) which are uncomfortable to the ears of the human being when it is rotated. An induction motor according to the present invention has therein a plurality of waveguide (or air guide) plates for efficiently exhausting air, which serves to cool the motor, outside the motor. These waveguide plates are arranged not to resonate with the frequency of the sound waves which are generated by the cooling air. The sound waves are guided outside the motor through the waveguide plates before it is amplified to a noise level which is uncomfortable to the ears of the human being. Noise caused when the motor is rotated at high speed can be thus eliminated.

Growing community of inventors

Tokyo, Japan

Kazuyuki Fujiwara