Patents by Inventor Kazutoshi Higuchi
Kazutoshi Higuchi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 6587673Abstract: In a multi-band radio terminal apparatus, when communication frequency bands are switched, a reception intermediate frequency is selected to be equal to each other in respective communication frequency bands. As a result, the circuit arrangements of this multi-band radio terminal apparatus succeeding to the intermediate frequency signal circuit stage are commonly used in the respective communication frequency bands. While a local oscillator signal is produced by a voltage-controlled oscillator, a phase-locked loop, and a doubler, in a case where communication is established within a plurality of communication frequency bands, the transmission/reception frequency intervals are different from each other. A mixer for a reception system and a mixer for a transmission system are commonly used so as to convert the frequency of the local oscillator signal into a frequency existing between the communication frequency and the intermediate frequency.Type: GrantFiled: March 12, 2002Date of Patent: July 1, 2003Assignee: Hitachi, Ltd.Inventor: Kazutoshi Higuchi
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Patent number: 6539218Abstract: A cellular mobile telephone apparatus has circuits for generating messages, a storage circuit for storing messages, and transmitter/receiver circuit for transmitting a message. When the user of the cellular mobile telephone apparatus cannot immediately respond to an incoming call, a desired one of a plurality of previously generated and stored messages can be transmitted to a calling party through simple key manipulations or by other means.Type: GrantFiled: March 28, 2001Date of Patent: March 25, 2003Assignee: Hitachi, Ltd.Inventors: Kazutoshi Higuchi, Katsuo Ogawa, Fumitaka Itoh, Yasuaki Takahara, Teiji Okamoto
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Publication number: 20030027533Abstract: In a multi-band radio terminal apparatus, when communication frequency bands are switched, a reception intermediate frequency is selected to be equal to each other in respective communication frequency bands. As a result, the circuit arrangements of this multi-band radio terminal apparatus succeeding to the intermediate frequency signal circuit stage are commonly used in the respective communication frequency bands. While a local oscillator signal is produced by a voltage-controlled oscillator, a phase-locked loop, and a doubler, in a case where communication is established within a plurality of communication frequency bands, the transmission/reception frequency intervals are different from each other. A mixer for a reception system and a mixer for a transmission system are commonly used so as to convert the frequency of the local oscillator signal into a frequency existing between the communication frequency and the intermediate frequency.Type: ApplicationFiled: September 27, 2002Publication date: February 6, 2003Inventor: Kazutoshi Higuchi
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Patent number: 6438358Abstract: In a multi-band radio terminal apparatus, even when communication frequency bands are switched, a reception intermediate frequency is selected to be equal to each other in the respective different communication frequency bands. As a result, the circuit arrangements of this multi-band radio terminal apparatus succeeding to the intermediate frequency signal circuit stage are commonly used in the respective communication frequency bands, and can be made simple.Type: GrantFiled: March 3, 1999Date of Patent: August 20, 2002Assignee: Hitachi, Ltd.Inventor: Kazutoshi Higuchi
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Publication number: 20020098809Abstract: In a multi-band radio terminal apparatus, when communication frequency bands are switched, a reception intermediate frequency is selected to be equal to each other in respective communication frequency bands. As a result, the circuit arrangements of this multi-band radio terminal apparatus succeeding to the intermediate frequency signal circuit stage are commonly used in the respective communication frequency bands. While a local oscillator signal is produced by a voltage-controlled oscillator, a phase-locked loop, and a doubler, in a case where communication is established within a plurality of communication frequency bands, the transmission/reception frequency intervals are different from each other. A mixer for a reception system and a mixer for a transmission system are commonly used so as to convert the frequency of the local oscillator signal into a frequency existing between the communication frequency and the intermediate frequency.Type: ApplicationFiled: March 12, 2002Publication date: July 25, 2002Inventor: Kazutoshi Higuchi
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Publication number: 20020058500Abstract: A cellular mobile telephone apparatus has circuits for generating messages, a storage circuit for storing messages, and transmitter/receiver circuit for transmitting a message. When the user of the cellular mobile telephone apparatus cannot immediately respond to an incoming call, a desired one of a plurality of previously generated and stored messages can be transmitted to a calling party through simple key manipulations or by other means.Type: ApplicationFiled: January 23, 2002Publication date: May 16, 2002Applicant: Hitachi, Ltd.Inventors: Kazutoshi Higuchi, Katsuo Ogawa, Fumitaka Itoh, Yasuaki Takahara, Teiji Okamoto
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Patent number: 6377823Abstract: A cellular mobile telephone apparatus including a main body, and an alarm device which is provided separately from the main body, the main body including: receiving/transmitting unit for receiving and transmitting radio frequency signals between a base station; modulating/demodulating unit for modulating and demodulating between the radio frequency signals, and a conversation signal and a control signal; telephone receiver unit for reproducing audible conversation voice in response to the demodulated conversation signal from the modulating/demodulating unit; telephone transmitting unit for converting conversation voice into the conversation signal; a controller for controlling operation of the main body of the cellular mobile telephone apparatus in accordance with the control signal; and an alarm device for providing an alarm signal which includes an identification information and is transmitted through the radio frequency, when a call is terminated at the main body; and the alarm device including: receiviType: GrantFiled: January 7, 2000Date of Patent: April 23, 2002Assignee: Hitachi, Ltd.Inventors: Kazutoshi Higuchi, Hiroyuki Tomihara, Yasuaki Takahara, Yoshihiro Kanomata
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Publication number: 20020045445Abstract: A cellular phone capable of informing a user of the deterioration of a line speech quality by raising an alarm. In the cellular phone according to the present invention, the condition in which the saturation of a transmission output lasts for a predetermined period of time or longer is detected, and a deterioration in the uplink speech quality is thereby predicted, an alarm signal being sent out to the cellular phone. Thus, the user is notified that a deterioration in the uplink speech quality occurs.Type: ApplicationFiled: April 27, 2001Publication date: April 18, 2002Applicant: HITACHI, LTD.Inventor: Kazutoshi Higuchi
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Publication number: 20020034970Abstract: A cellular mobile telephone apparatus comprising a main body, and an alarm device which is provided separately from said main body, said main body including: receiving/transmitting means for receiving and transmitting radio frequency signals between a base station; modulating/demodulating means for modulating and demodulating between the radio frequency signals, and a conversation signal and a control signal; telephone receiver means for reproducing audible conversation voice in response to the demodulated conversation signal from said modulating/demodulating means; telephone transmitting means for converting conversation voice into the conversation signal; means for controlling operation of said main body of said cellular mobile telephone apparatus in accordance with the control signal; and means for providing an alarm signal which includes an identification information and is transmitted through the radio frequency, when a call is terminated at said main body; and said alarm device including: receiving meanType: ApplicationFiled: January 7, 2000Publication date: March 21, 2002Inventors: KAZUTOSHI HIGUCHI, HIROYUKI TOMIHARA, YASUAKI TAKAHARA, YOSHIHIRO KANOMATA
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Publication number: 20010036838Abstract: In a multi-band radio terminal apparatus, even when communication frequency bands are switched, a reception intermediate frequency is selected to be equal to each other in the respective different communication frequency bands. As a result, the circuit arrangements of this multi-band radio terminal apparatus succeeding to the intermediate frequency signal circuit stage are commonly used in the respective communication frequency bands, and can be made simple.Type: ApplicationFiled: June 25, 2001Publication date: November 1, 2001Inventor: Kazutoshi Higuchi
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Publication number: 20010023195Abstract: A cellular mobile telephone apparatus comprising a main body, and an alarm device which is provided separately from said main body, said main body including: receiving/transmitting means for receiving and transmitting radio frequency signals between a base station; modulating/demodulating means for modulating and demodulating between the radio frequency signals, and a conversation signal and a control signal; telephone receiver means for reproducing audible conversation voice in response to the demodulated conversation signal from said modulating/demodulating means; telephone transmitting means for converting conversation voice into the conversation signal; means for controlling operation of said main body of said cellular mobile telephone apparatus in accordance with the control signal; and means for providing an alarm signal which includes an identification information and is transmitted through the radio frequency, when a call is terminated at said main body; and said alarm device including: receiving meanType: ApplicationFiled: February 22, 2001Publication date: September 20, 2001Inventors: Kazutoshi Higuchi, Hiroyuki Tomihara, Yasuaki Takahara, Yoshihiro Kanomata
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Patent number: 6275690Abstract: A cellular mobile telephone apparatus has circuits for generating messages, a storage circuit for storing messages, and transmitter/receiver circuit for transmitting a message. When the user of the cellular mobile telephone apparatus cannot immediately respond to an incoming call, a desired one of a plurality of previously generated and stored messages can be transmitted to a calling party through simple key manipulations or by other means.Type: GrantFiled: December 24, 1997Date of Patent: August 14, 2001Assignee: Hitachi, Ltd.Inventors: Kazutoshi Higuchi, Katsuo Ogawa, Fumitaka Itoh, Yasuaki Takahara, Teiji Okamoto
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Publication number: 20010011014Abstract: A cellular mobile telephone apparatus has circuits for generating messages, a storage circuit for storing messages, and transmitter/receiver circuit for transmitting a message. When the user of the cellular mobile telephone apparatus cannot immediately respond to an incoming call, a desired one of a plurality of previously generated and stored messages can be transmitted to a calling party through simple key manipulations or by other means.Type: ApplicationFiled: March 28, 2001Publication date: August 2, 2001Applicant: Hitachi, Ltd.Inventors: Kazutoshi Higuchi, Katsuo Ogawa, Fumitaka Itoh, Yasuaki Takahara, Teiji Okamoto
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Patent number: 6032058Abstract: A cellular mobile telephone apparatus including a main body, and an alarm device which is provided separately from the main body, the main body including: receiving/transmitting unit for receiving and transmitting radio frequency signals between a base station; modulating/demodulating unit for modulating and demodulating between the radio frequency signals, and a conversation signal and a control signal; telephone receiver unit for reproducing audible conversation voice in response to the demodulated conversation signal from the modulating/demodulating unit; telephone transmitting unit for converting conversation voice into the conversation signal; a controller for controlling operation of the main body of the cellular mobile telephone apparatus in accordance with the control signal; and an alarm device for providing an alarm signal which includes an identification information and is transmitted through the radio frequency, when a call is terminated at the main body; and the alarm device including: receivingType: GrantFiled: June 10, 1997Date of Patent: February 29, 2000Assignee: Hitachi, Ltd.Inventors: Kazutoshi Higuchi, Hiroyuki Tomihara, Yasuaki Takahara, Yoshihiro Kanomata
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Patent number: 5930695Abstract: A radio receiver is disclosed. An arbitrary receive signal received through an antenna is amplified by an input amplifier. The signal amplified by the input amplifier is converted into a predetermined frequency by a mixer. The signal frequency-converted by the mixer is shaped in waveform by a band-limiting filter. The signal thus shaped in waveform is amplified and amplitude-limited by a limiting amplifier. The signal limited in amplitude is demodulated by a demodulator. In order to prevent the mixer circuit from generating a distortion due to an excessive input, another amplitude-limiting circuit operated at a level not saturating the mixer circuit is arranged in a stage before the mixer circuit.Type: GrantFiled: December 1, 1995Date of Patent: July 27, 1999Assignee: Hitachi, Ltd.Inventors: Tsutomu Yamaguchi, Fuminori Itukaiti, Kazutoshi Higuchi, Jun'ichi Nakagawa
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Patent number: 5027070Abstract: In an MR imaging system and method using a surface coil, the intensity of a high frequency magnetic field providing a magnetic resonance signal of the maximum intensity for each of distances from a coil plane of the surface coil to planes to be imaged is determined and stored. When a distance from the coil plane of the surface coil to a desired plate to be imaged is set, data of the high frequency magnetic field stored corresponding to the set distance is read and the intensity of a high frequency magnetic field to be applied is determined on the basis of the read data.Type: GrantFiled: December 19, 1989Date of Patent: June 25, 1991Assignee: Hitachi, Ltd.Inventor: Kazutoshi Higuchi
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Patent number: 4757260Abstract: A plurality of selective radio frequency .pi. pulses are applied to an object placed in a static magnetic field which has a magnetic field gradient, to select a plurality of slices of the object corresponding to these pulses. Nuclear magnetic resonance signals are generated from the slices in a manner that a time interval between the selection of slice and the generation of nuclear magnetic resonance signal remains substantially constant for all of the slices.Type: GrantFiled: December 17, 1985Date of Patent: July 12, 1988Assignee: Hitachi, Ltd.Inventors: Munetaka Tsuda, Kazutoshi Higuchi