Pioneer Electronic Corporation

Hitachi, Ltd.

Nihon Kohden Corporation

Nobuhiro Suzuki

Masao Kase

Ryo Matsuura

Fumihiko Yokogawa

Kazuo Watanabe

Yasuo Kominami

Shigeru Yasuda

Hiroshi Otsubo

Kohei Nakamura

Hirokazu Soma

There is provided an electrode catheter for measuring an electric potential inside a heart of a subject. The electrode catheter includes: a shaft that is inserted into the heart, wherein the shaft includes a distal end portion, and a guide portion that is connected to the distal end portion; a non-contact electrode that is provided on an outer circumferential surface of the distal end portion or the guide portion; and at least one contact electrode that is provided on the outer circumferential surface of the distal end portion and that is configured to make contact with an endocardium of the heart. The non-contact electrode is provided on the outer circumferential surface of the distal end portion or the guide portion so as not to make contact with the endocardium in a state where the contact electrode is in contact with the endocardium.

Electrode catheter

An apparatus for controlling rotation of a spindle motor includes a lock detection unit, a memory unit, a comparison unit, and a control unit. When the lock detection unit detects the lock state of the time base servo loop, a voltage corresponding to the frequency of a read RF signal is stored in the memory unit. When the control unit detects that the rotation velocity of the spindle motor greatly deviates from a normal rotation velocity, it effects a control so as to accelerate or decelerate the spindle motor in dependency upon a compared result of the comparison unit which makes a comparison between a voltage corresponding to the frequency of the read RF signal and a voltage stored in the memory unit.

Apparatus for controlling rotation of disk player

A control circuit of a tray loading apparatus determines, according to a disc size and a tray moving direction, a time during which to control the motor at a constant speed. When the specified time has elapsed after the motor was started, the control circuit produces a pulse-width modulated output to slowly lower the motor speed, eliminating impact noise when the tray strikes a stopper. This motor deceleration time is measured. When the measured deceleration time disagrees with a preset or previously detected target deceleration time, the difference is either added to or subtracted from a constant-speed motor operation time and the resultant value is taken as the next target time for constant-speed motor operation. In this way, by changing the time during which the motor is driven at a constant speed, any variations in the tray moving speed as might occur from varying loads on the motor are absorbed to keep the motor deceleration time and decelerating speed unchanged, thus making the tray motion smooth.

Tray loading apparatus for disc players

Conventional Dolby B-type or C-type noise reduction systems respond sensitively to an A.C. bias signal during recording onto a magnetic tape. As a result, the system might exhibit a large encode error. In order to reduce such encode error, the gain - frequency characteristic control sensitivity of a side chain in the system to the A.C. bias signal to be supplied to a recording head is set at a value smaller than that of the gain - frequency characteristic control sensitivity of the side chain to an encode input signal at an audio frequency. Such a reduction of the encode error is achieved by connecting a bias trap circuit to a gain control amplifier included in the side chain.

Noise reduction system

Growing community of inventors

Tokorozawa, Japan

Nobuhiro Suzuki