Sony Corporation

Sekisui Chemical Co., Ltd.

Norio Numata

Satoshi Yokoya

Masaki Tono

Kazuyuki Yahara

Hitomi Muraoka

Bunji Yamaguchi

Hiroshi Yasuda

Norio Shimo

Kanji Ohnishi

Ikuo Shimizu

A fire-resistant sheet-like molded article comprising a resin composition and having the relationship between the initial thickness t (mm) and temperature difference &#x394;(&#xb0; C.) between one side and the reverse side after heating of said one side at 500&#xb0; C. for 1 hour as represented by:&#x394;, andhaving the initial bulk density at 25&#xb0; C. of 0.8 to 8.0 g/cmand the bulk density after 1 hour of heating at 500&#xb0; C. of 0.05 to 0.5 g/cmis provided along with a method of fabricating a fire-resistant structural steel and fire-resistant wall.

Fire-resistant sheetlike molding, fire-resistant laminate for covering steel, fire-resistant structure for wall, and method for constructing fire-resistant steel and fire-resistant wall

An intermittently driven transmitter having high power output which is driven intermittently so as to transmit a signal via, for example, a satellite in which the voltage supplied to the transmitter is boosted and supplied to a capacitor. When the signal is to be transmitted, the voltage stored on the capacitor is supplied to a constant voltage circuit which generates a constant voltage which is higher than the voltage supplied to the transmitter and which is supplied to a power amplifier in the final stage of the transmitter and, thus, the intermittent type transmitter with a suitable battery drive system is obtained.

Intermittently driven transmitter

In a telephone apparatus used for a telephone system such that the telephone set is connected to a remote destination telephone set through telephone circuits after an ID number of a subscriber has been transmitted to the telephone company, the handset comprises a key entry section including plural dial keys, a memory section for storing the ID number and destination telephone numbers, a display section for displaying a destination telephone number corresponding to an operated dial key, and a control section for enabling a display of the ID number when the ID number is written but disabling a display of the ID number when read. Since the ID number is not displayed while being read to transmit it to the telephone company, the ID number of the subscriber is kept secret from others.

Telephone apparatus

A cordless telephone comprises a base unit and a plurality of remote units. The remote units are respectively adapted to establish radio communication at separate times with the base unit. Each remote unit generates a particular code in a particular format that includes at least one interval in which the particular code is present and at least one interval from which the particular code is absent. The particular code and particular format of each remote unit are different from those of the other remote units. A transmitter in each remote unit transmits the particular code of that unit in the particular format thereof to the base unit. The particular formats are such that the transmission of each particular code periodically corresponds to non-transmission of all of the other particular codes of the remote units. The particular codes can thus periodically be received by the base unit without interference caused by transmission of the other particular codes. The base unit echoes the particular code transmitted by a selected one of the remote units, and each of the remote units detects whether or not its own particular code matches the particular code echoed by the base unit. In response to such a match, a communication channel is established between the base unit and the one of the remote units in which the match occurs. The communication channel while established precludes establishment of a communication channel between the base unit and any of the other remote units.

Signal transmitting and/or receiving apparatus

Decoding or demodulating circuitry can produce stereo right channel and left channel signals from AM stereo signals that have been coded according to any of the well known methods. A stereo sum signal made up of the left and right channel stereo signals added together, and a stereo difference signal made up of the difference between the stereo left and right channel signals are developed and fed to a matrix to interconnect these signals to extract or separate the left and right channel stereo signals. At least one of the known methods of stereo coding requires phase shifting of these two developed signals and suitable phase shift circuitry, along with a switching circuit provides the matrix with the appropriate signals when that method of stereo coding is employed at the broadcast side. The stereo sum signal is developed using envelope detection and the stereo difference signal is developed using synchronous detection, with the synchronous detector employing signals developed in the envelope detection process. When the stereo broadcasting wave belongs to the other coding systems, the stereo sum and difference signals are respectively supplied directly to the matrix circuit through the switches.

AM stereo decoder for multiple coding systems

In a radio receiver including a demodulating circuit with monaural and stereophonic modes for respectively demodulating a monaural broadcast signal having a carrier amplitude modulated with a monaural signal and demodulating an AM stereophonic broadcast signal having a carrier modulated with the sum and difference of right- and left-channel stereophonic signals and with a relatively low frequency pilot signal, and a tuning section operable for tuning the receiver to receive a broadcast signal whose carrier has a selected frequency; a filter is effective to extract the pilot signal from the received broadcast signal when the latter is an AM stereophonic broadcast signal and the stereophonic mode of the demodulating circuit is established in response to the extracted pilot signal, a disturbance signal generated upon operation of the tuning section or in response to external noise and which is in a frequency range near to the frequency of the pilot signal so as to be possibly extracted with the latter, and thereby confused with the pilot signal for establishing the stereophonic mode, is separately detected, and establishment of the stereophonic mode is prevented, for example, by muting an output of the filter, in response to detection of the disturbance signal while a monaural broadcast signal is being received.

AM Stereophonic demodulating circuit

Apparatus for receiving an AM stereophonic signal of the type having monaural information represented by amplitude modulations of a signal carrier and stereophonic information represented by phase modulations of the signal carrier. A reference signal generator generates a reference signal that is synchronized with the signal carrier of the received AM stereophonic signal. In one embodiment, the reference signal generator is a phase-locked loop which generates a reference carrier whose frequency is substantially equal to the signal carrier frequency and whose phase is locked to a predetermined signal carrier phase. An amplitude limiter limits the AM stereophonic signal to remove amplitude modulations of the signal carrier and thereby produce an amplitude-limited signal carrier. A demodulator demodulates the information represented by the AM stereophonic signal, and a detector is provided to detect if the stereophonic information will be properly demodulated. A switching arrangement is controlled by the detector to supply the reference signal to the demodulator, whereby the stereophonic information is demodulated, or to supply the amplitude-limited signal carrier to the demodulator, whereby the monaural information is demodulated.

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Tokyo, Japan

Norio Numata