Victor Company of Japan, Limited

Hitachi, Ltd.

Fujitsu Corporation

Matsushita Electric Industrial Co., Ltd.

Yasuaki Watanabe

Yukio Okabe

Yuichi Ikemura

Mitsuru Hayakawa

Shinichi Kojima

Toyotaka Machida

Daisuke Murakami

Akira Tohkairin

Sumio Yokokawa

Kenji Kaneko

Toshio Tomite

Nobuhiko Ogasawara

Mitsuya Sato

Nobuhiko Ogasawala

Hitoshi Aoike

Kazuo Yamada

Teruaki Noda

Mituo Odazima

Toshimasa Kumazaki

Hiroji Ibaraki

Teruhisa Honshima

Akira Takahachi

Tadayochi Samata

Yasuhiro Fujita

An electronic device includes: a frame forming an edge portion of a plate-like housing; a groove defining a hollow, along an edge of the housing, in the frame; and a reinforcement disposed in the frame and made of a platable resin with which the groove is filled.

Electronic device including reinforcement formed at edge of housing and wireless communication apparatus including reinforcement formed at edge of housing

A method of manufacturing an armature of an electric rotary machine comprising the step of: fixedly attaching an armature core to a shaft which is a constituent component of the armature; winding armature coils in slots formed in the outer circumference of the armature core, the lower and upper lead-out portions of the armature coils being axially extended to a commutator arrangement space where a commutator is to be arranged; welding the respective end portions of each pair of the upper and lower lead-out end portions so as to join the upper and lower lead-out end portions in each pair with each other under the condition that the upper and lower lead-out end portions in each pair are arranged vertically one on the other and parallelly to each other while securing concave portions at the welding-joined portions to thereby form each of commutator segment portions; arranging the commutator segment portions in alignment at predetermined intervals circumferentially around the shaft; and molding and fixedly attaching an annular resin-molding body which will be made to be a body of commutator at the commutator arrangement space around the shaft in a manner so that the commutator segment portions are fixedly embedded in the annular resin-molding body, that the outer peripheral portions of the commutator segment portions are exposed from the outer circumference of the annular resin-molding body to enable a commutator brush to slidably contact with the outer peripheral portions of the commutator segment portions, and that the concave portions provided at the welding-joined portions of the commutator segment portions are filled with the resin of the annular resin-molding body.

Method of manufacturing armature of electric rotary machine

An armature for an electric rotary machine, comprising a laminated iron core including a plurality of slots, and teeth, alternately disposed in the cylindrical surface of the iron core, windings placed in said slots, and anchors for preventing the windings placed in the slots from being displaced, wherein the anchors are formed by deforming the end portions of the teeth, while forming before mounting the windings into the slots, a through hole extending through the end portion of each tooth.

Armature for an electric rotary machine and method of manufacturing the

An information signal recording medium reproducing apparatus comprises an equalizer supplied with a frequency modulated composite video signal picked up from an information signal recording medium, a frequency demodulator for frequency-demodulating an output signal of the equalizer into a composite video signal, a synchronizing signal separating circuit for separating a horizontal synchronizing signal from the composite video signal, and a switching signal generating circuit for forming a switching signal from the horizontal synchronizing signal. The equalizer is supplied with the switching signal and has such a circuit construction that a frequency at which an output level versus frequency characteristic of the equalizer has a peak is reduced responsive to the switching signal during a predetermined time period in a vicinity of the front edge of the horizontal synchronizing signal to correct a distorted waveform of the frequency modulated composite signal caused by defects in the information signal recording medium.

Information signal recording medium reproducing apparatus with an

An intermodulation distortion reducing circuit for a frequency-modulated signal comprises a sinusoidal wave shaping circuit supplied with an input frequency-modulated signal including an intermodulation distortion component, for shaping the waveform of the input frequency-modulated signal into a waveform closely approximating a sinusoidal wave, and a mean DC level detecting circuit supplied with an output signal of the sinusoidal wave shaping circuit, for detecting a mean DC level of the output signal of the sinusoidal wave shaping circuit and producing a detection output. The sinusoidal wave shaping circuit is supplied with the detection output of the mean DC level detecting circuit and a waveform shaping quantity thereof is varied to obtain the waveform closely approximating the sinusoidal waveform. The sinusoidal wave shaping circuit produces a frequency-modulated signal having a waveform closely approximating a sinusoidal waveform, with its intermodulation distortion component reduced.

Circuit for reducing intermodulation distortion in a frequency-modulated

A reproduced color video signal processing circuit in a rotary recording medium reproducing apparatus reproduces a recorded signal from a rotary recording medium which is recorded with a composite color video signal in which a carrier chrominance signal is frequency-converted into a low frequency band and multiplexed using a common frequency band within a part of a frequency band of a luminance signal, and levels of the carrier chrominance signal and a color burst signal are controlled according to the level of the carrier chrominance signal with respect to the color burst signal. The processing circuit comprises a carrier chrominance signal obtaining circuit for obtaining a carrier chrominance signal returned to the original frequency band by frequency-converting the reproduced composite color video signal, a level controlling circuit for controlling the level of the color burst signal to a constant value according to the level of the color burst signal within the carrier chrominance signal thus obtained, a time axis deviation compensation circuit for substantially compensating for a time axis deviation component of the carrier chrominance signal which is to be obtained by the carrier chrominance signal obtaining circuit, a time axis deviation component adding and frequency converting circuit for adding the time axis deviation component to the carrier chrominance signal thus obtained, and frequency-converting and returning the carrier chrominance signal to the low frequency band, and a luminance signal obtaining circuit for obtaining the luminance signal by subtracting the carrier chrominance signal returned to the low frequency band from the reproduced composite color viedo signal.

Color video signal processing circuit for performing level control and

A dropout compensation circuit for a reproduced video signal in a reproducing apparatus for reproducing a composite color video signal recorded in a recording medium, wherein the composite color video signal consists of a luminance signal occupying a predetermined frequency band and a carrier chrominance signal multiplexed with a common frequency band at a high frequency part of the luminance signal, comprises an amplitude modulator for amplitude-modulating a carrier by a reproduced composite color video signal, a delay circuit having a frequency band for passing a part excluding a higher frequency part of an upper side band and a lower frequency part of a lower side band of an output amplitude-modulated signal of the amplitude modulator, and delaying the signal by a predetermined delay time, a demodulating circuit for demodulating an output amplitude-modulated signal of the delay circuit, a detection circuit for detecting dropout within the reproduced composite color video signal, a switching circuit switched over by an output of the detection circuit, for passing and supplying the reproduced composite color video signal when dropout is not detected, and passing and supplying an output signal of the demodulating circuit when dropout is detected, and a circuit for obtaining a luminance signal compensated of the dropout from the signal passed through the switching circuit.

Dropout compensation and chrominance subcarrier frequency conversion

A rotary recording medium reproducing apparatus reproduces a recorded signal from a rotary recording medium by use of a reproducing element. The rotary recording medium is recorded with at least a first carrier signal which is modulated by an information signal having a synchronizing signal of a predetermined frequency. The reproducing apparatus comprises a motor for rotating the rotary recording medium, a reference signal generating circuit for generating a reference signal having a frequency equal to a horizontal scanning frequency of a video signal of a standard television system which is characteristic of the reproducing apparatus and should originally be reproduced, or equal to 1/M (M is an integer) times the above horizontal scanning frequency, a detecting circuit for detecting a signal respective of the rotational speed of the rotary recording medium, and a comparator for comparing the reference signal and the signal respective of the rotational speed of the rotary recording medium, to control the rotational speed of the rotary recording medium by a compared output signal thus obtained, so that the synchronizing signal within the reproduced signal is reproduced at a frequency equal to the horizontal scanning frequency of the above standard television system with which the reproduction should originally be performed.

Means for compatibly reproducing video discs recorded according to

A rotation stopping apparatus for a motor comprises a frequency signal generating circuit for generating a signal having a frequency according to a rotational speed of a motor, a voltage forming circuit for forming a voltage according to the frequency of the frequency signal from the frequency signal generating circuit, a motor driving circuit for supplying a forward direction current to the motor upon rotation of the motor and supplying a reverse direction current to the motor when the rotation of the motor is stopped to perform a damping operation with respect to the rotation of the motor, a detecting circuit for detecting that a voltage from the voltage forming circuit has become below a predetermined threshold voltage, and an interrupting circuit for interrupting the supply of the reverse direction current to the motor by the motor driving circuit according to the detected result obtained from the detecting circuit.

Rotation stopping apparatus for a motor

A PCM signal extracting circuit comprises a highpass filter for separating a PCM signal, of a type not including a DC component, inserted between horizontal synchronizing signals within a predetermined interval of a composite video signal or a signal based on the composite video signal, and for obtaining an average DC level of the horizontal synchronizing signal and the PCM signal, an attenuation circuit for attenuating an output signal of the highpass filter by a predetermined quantity according to the modulation factor of the PCM signal, a holding circuit for holding a peak value, at the opposite side from the horizontal synchronizing signal, of the signal attenuated by the attenuation circuit, and a level comparing circuit for comparing the levels of output signals of the highpass filter and the holding circuit, and extracting a signal obtained by slicing the output signal of the highpass filter by the level of the output signal of the holding circuit. The attenuation circuit attenuates the PCM signal so that the level of the peak value, at the opposite side from the horizontal synchronizing signal, of the attenuated PCM signal, is equal to a level shifted towards a side opposite from the horizontal synchronizing signal by kx% from an average DC level of the PCM signal before attenuation, where k is a constant, and a distance between the average DC level of the PCM signal and the peak value of the PCM signal at the opposite side from the horizontal synchronizing signal is designated by x% where the distance between the pedestal of the horizontal synchronizing signal and the white peak level is expressed as 100%.

PCM Signal extracting circuit

In a color television receiver adapted to receive a color television signal containing vertical interval reference (VIR) signals, a VIR correction circuit is provided to automatically control the hue and color saturation of the received broadcast signal, which may also be coupled to a video tape recorder of the type in which adjacent field signals are recorded with their respective record tracks being skewed relative to each other to permit elimination of otherwise required guardbands between adjacent field tracks. The recorded video signal is reproduced by mixing adjacent horizontal line signals to reduce crosstalk level. A disabling circuit is provided to disable the VIR correction circuit when the receiver is switched to the output of the video tape recorder in playback mode to prevent false VIR signals due to the mixing from affecting the reproduced colors.

Color television receiver with means for disabling VIR correction during

A television signal discrimination system is used in a television receiver provided with an electronic tuner for producing as output an intermediate-frequency signal whose synchronizing frequency is varied in response to an applied voltage and with a circuit for detecting the output signal of the electronic tuner. This system comprises a first synchronizing signal separation circuit supplied with the output of the detection circuit and separating a vertical synchronizing signal, a first integration circuit connected to the output side of the first synchronizing signal separation circuit, a circuit supplied with an output voltage of the first integration circuit and a reference voltage and operating to compare the magnitudes thereof, a second synchronizing signal separation circuit supplied with the output of the detection circuit and separating a vertical synchronizing signal, a second integration circuit connected to the output side of the second synchronizing signal separation circuit, a circuit for discriminating the frequency of the output of the electronic tuner, and a circuit for discriminating a normal television signal on the basis of the output of the voltage comparing circuit, the output of the second integration circuit, and the output of the frequency discriminating circuit. The first synchronizing signal separation circuit and the first integration circuit producing, as output, different voltages, with the reference voltage as a borderline, depending on and distinguishing between the case where the output signal of the detection circuit is a normal television signal and the case where the output signal is a different spurious television signal.

Television signal discrimination system in a television receiver

In a color signal reproducing circuit, a red color difference signal from a color demodulator circuit is corrected by a blue color difference signal, and the blue color difference signal is corrected by a luminance signal. The phase of a color subcarrier signal to be supplied to the color demodulator circuit is controlled by the corrected red color difference signal during reception of a VIR signal, and the level of a color signal to be supplied to the color demodulator circuit is controlled by the corrected blue color difference signal. The controls of hue and color saturation are facilitated by the use of the corrected color difference signals. It is also made possible to deliver from the color demodulator circuit, color difference signals which match the fluorescence characteristics of a color picture tube.

Color signal reproducing system and circuit for the same

A vertical deflection circuit is used in a camera tube in a color television camera in which the camera tube is provided with an optical filter having an optically black part extending in parallel with a beam scanning direction of the camera tube. A vertical deflection circuit comprises a circuit for generating a saw-tooth voltage for vertical deflection, a vertical deflection coil for the camera tube, and a circuit for supplying the saw-tooth voltage thus generated to one end of the vertical deflection coil in DC coupling. Due to temperature fluctuation, a vertical deflection width fluctuates with respect to a position corresponding to a black part of the filter, as a reference.

Vertical deflection circuit for a camera tube in a television camera

An input signal is coupled via a capacitor to a base of a transistor which constitutes a differential amplifier with another transistor. The base of the transistors are respectively fed with first and second predetermined voltages via a pair of transistors so that the differential amplifier produces an output signal proportional to the difference between the peak value of the input signal and a predetermined value only when the peak to peak value of the input signal exceeds a predetermined voltage.

Growing community of inventors

Kasukabe, Japan

Yasuaki Watanabe