Matsushita Electric Industrial Co., Ltd.

Yoshio Horiike

Hiroaki Kosugi

Yoshishige Yoshikawa

Yoshiyuki Yokoajiro

Tsuneo Ohkubo

Makoto Hasegawa

Hisashi Adachi

Masahiro Mimura

Noboru Katakabe

Shinji Miyauchi

Atsushi Sogami

Masahiro Yamamoto

Yuji Nakamura

Takashi Uno

Kiyotake Fukui

Kazutaka Asano

Hiroyuki Imai

Shinichi Nakane

Yasuo Nagaishi

Hirokuni Murakami

Takayuki Matsumoto

Takayuki Suematsu

Yasuo Yoshimura

Makoto Tsuboi

Terue Matsumura

Toshiaki Inui

Tohru Atsumi

Shoichi Nakamura

An antenna apparatus includes a minute loop antenna and at least one antenna element. The minute loop antenna is provided to be electromagnetically close to a dielectric substrate including a grounding conductor, has a predetermined number N of turns and a predetermined minute length, operates as a magnetic ideal dipole when a predetermined metal plate is located closely to the antenna apparatus, and operates as a current antenna when the metal plate is located apart from the antenna apparatus. The antenna element is connected to the minute loop antenna, and operates as a current antenna. In the antenna apparatus, one end of the antenna apparatus is connected to a feeding point, and another end of the antenna apparatus is connected to the grounding conductor of the dielectric substrate.

Antenna apparatus utilizing minute loop antenna and radio communication apparatus using the same antenna apparatus

Receiver and transmitter-receiver

An abnormality detecting apparatus constantly monitors even a slight amount of gas which has leaked by checking a gas supply pipe when it is determined that the pressure regulating function of a pressure regulator is abnormal. The abnormality detecting apparatus detects an abnormality of the regulated pressure of a pressure regulator appropriately by comparing the regulated pressure with a predetermined low value of a pressure regulating range when the gas flow rate is high and with a predetermined high value of a pressure regulating range when the gas flow rate is low.

Method and apparatus for detecting abnormality in gas supply equipment

In a radio receiver apparatus of an orthogonal detection type, a voltage controlled first local oscillator generates a first local oscillation signal, and mixers mix an inputted reception signal with the first local oscillation signal and a 90.degree. shifted signal thereof, respectively, the mixed signals respectively being passed through first and second band-pass filters to obtain desired first intermediate frequency signals. Further, a second local oscillator generates a second local oscillation signal. Further mixers mixes the first intermediate frequency signals from the first and second band-pass filters with the second local oscillation signal and a 90.degree. shifted signal thereof, respectively. Then there is calculated either one of a sum of and a difference between the resulting mixed signals, the calculated signal being passed through a third band-pass filter to obtain a second intermediate frequency signal to be demodulated. Furthermore, an average frequency detector detects an average frequency of the second intermediate frequency signal for a predetermined time interval, and a frequency correction circuit controls the first local oscillation frequency of the first local oscillation signal based on the detected average frequency.

Radio receiver apparatus of orthogonal detection type comprising local

A flow amount measuring and controlling apparatus which has a built-in gas meter can compute and control the flow amount used for each gas appliance by the estimation of the gas appliance generated in the flow variation from the change of the monetary flow amount passing through the gas meter, whereby, since the condition of the gas appliance can be correctly determined, the abnormal operation of the gas appliance can be detected so as to shut off the gas.

Flow amount measuring and controlling apparatus

An apparatus for controlling a transmission output level for a burst signal which is used in a communication of the TDMA system in which a transmission output level can be arbitrarily set. The apparatus comprises a variable gain amplifier whose gain can be varied by a control voltage which is inputted to a control terminal; a variable gain amplifier whose gain can be varied by a control voltage which is inputted to a control terminal; a detecting circuit in which the variable gain amplifiers and are cascade connected to an input terminal to which a signal of a predetermined amplitude is inputted and to which an output electric power of the amplifier at the post stage is inputted and which extracts and detects a part of a voltage which is proportional to the output electric power; an attenuator which receives the voltage detected by the detecting circuit and can output at an arbitrary attenuation ratio; a reference waveform generating apparatus for outputting an envelope for a burst signal; a comparison amplifier which amplifies a different voltage between an output voltage of the attenuator and an output voltage of the reference waveform generating apparatus and whose output is connected to the control terminal of the variable gain amplifier; a control unit for controlling the control voltage of the variable gain amplifier and the attenuation ratio of the attenuator; and an output terminal for outputting a burst waveform from the detecting circuit.

Apparatus for controlling transmission output level for burst signal

The present invention relates to bit synchronization required for a data transmitting/receiving system. An average phase error between edges of an input waveform and edges of an ideal bit synchronous pattern generated internally is taken and the ideal bit synchronous pattern is shifted by the amount corresponding to the average error, so that a sampling signal is generated on the basis of that pattern. Thus, bit synchronization is established by means of software on microcomputor.

Establishment of bit synchronization in a data transmitting/receiving

An image read apparatus for reading an image on a document which includes a reciprocatively movable document placing plate for placing thereon the document, a document placing plate driving mechanism for driving the document placing plate and an image reader for reading the image information on the document. The document placing plate is movable reciprocatively between a first position where the document placing plate is housed completely in the image read apparatus and a second position where the document placing plate projects outwardly from the image read apparatus to thereby enable the document to be placed thereon. The image read apparatus sequentially reads the image information on the document between each sequential movement of the document placing plate from the second position to the first position. Preferably, a document holding member such as a flexible sheet or an endless belt is provided for pressing the document onto the document placing plate within the image read apparatus.

Image read apparatus with reciprocating document placing plate

A transmitter/receiver system for converting digital information into a multi-frequency signal for transmission. A reference frequency signal is first transmitted, then a series of frequencies having information indicative of differences with the reference signal are transmitted, and a receiver discriminates differences with the reference frequency signal to decode the information.

Transmitter/receiver system

A four-channel stereo receiver capable of making the four-channel indication, and automatically changing over the four-channel mode operation and the two-channel mode operation or muting the monaural and the two-channel signal, based on the presence or absence of at least one of the second and the third sub-channel signals, and the second pilot signal included in the four-channel composite signal but not in the two-channel composite signal.

Four-channel stereo receiver

A 4-channel stereophonic demodulating system based on a switching mode, which comprises a plurality of switching means for demodulating a received 4-channel stereophonic composite signal under control by a first and a second switching signals obtained from a pilot signal, means to separately derive four stereophonically related signals at the respective output terminals of said switching means, and adding means to add plural output signals from at least one switching means to each other. The signal levels of the individual channel signal components are adjustable by said adding means relative to one another to enable separation adjustment, so that in each of the four stereophonically related signals which appear at respective output terminals of the system, cross-talk due to the other signals is reduced.

4-Channel stereophonic demodulating system

A zone time display clock having a zone or locality appointing and displaying means having a form of a world map and provided with touch detecting terminals disposed on the world map and with zone illuminating means for illuminating the designated zone. The clock further comprises a reference clock, a time difference generating circuit for generating the time difference signals for the designated and the 'home' localities with respect to the reference locality alternately, touch switch means for memorizing a touched place in the world map and activating the zone displaying means and the time difference generating circuit, time and date difference calculating means for calculating the time and the date difference for the designated locality with respect to the 'home' locality, and display driving means for displaying the time and the date difference or the date for the designated locality.

Growing community of inventors

Shijonawate, Japan

Yoshio Horiike