Uniden Corporation

Seiko Instruments Inc

Kiyoshi Tanaka

Ping Huang

Yumi Hachisuka

Kazuo Maeda

Hideo Hikuma

Masayasu Fujino

Katsuhiko Otsuji

Hong Zuo

Yuukou Hata

Jun Yang

Koichi Tomono

An optical fiber connector plug protecting cap is configured to be mounted to an optical fiber connector plug having a ferrule with an insertion hole into which an optical fiber is inserted and a holding member for holding the ferrule. The optical fiber connector plug protecting cap has a tubular cap member made of a resin material and configured to be fitted to a tip opening of the holding member to cover a tip portion of the ferrule in a non-contacting state, and a strap member having first and second end portions and comprised of an elastic body having a relatively greater flexibility than the cap member. The cap member has a connecting part having a locking hole for locking the first end portion of the strap member. The first end portion of the strap member has an engagement protrusion for engagement with the locking hole in a state in which the first end portion extends through the locking hole. The engagement protrusions of the strap member has a deformable portion configured to be deformed so that the engagement protrusions is locked to an edge portion of the connecting part of the cap member near the locking hole.

Optical fiber connector plug protecting cap

There is provided a cordless telephone which can be connected to any one of digital exchanges of different protocols. A main unit of the cordless telephone is provided with a memory for storing a table for collating control data (first control data) defined by the protocol of a digital exchange to be connected and control data (second control data) inherent to the cordless telephone. The main unit also includes a protocol converting circuit 4 for conversion between the first control data and the second control data. If the cordless telephone is to be connected to another digital exchange structured in a different protocol, a protocol circuit 4 corresponding to the protocol of the digital exchange is used. Transfer of conversation between the cordless telephone and a fixed telephone can also be realized by providing a data distributing and combining circuit.

Cordless telephone containing a protocol converting circuit to connect

A parent telephone set comprises a transformer, a sidetone level reducing circuit, and a first secret talk processing circuit for executing digital secret talk processing, a counterpart slave telephone set comprises a second secret talk processing circuit for executing digital secret talk processing, a delaying circuit for delaying an aural signal from the slave telephone set microphone by a specified delay time, and a level reducing circuit for reducing the level of output from the second secret talk processing circuit according to the output from the delaying circuit. The specified delay time in the delaying circuit is set according to the time required for digital secret talk processing in the first secret talk processing circuit as well as in the second secret talk processing circuit.

Cordless parent/slave telephone set with improved sidetone handling

This invention provides a cordless telephone system in which communication is executed between a master phone and a slave phone, said master phone and said slave phone respectively comprising a memory section for storing ID code indicating that the master phone and slave phone forms a pair, a unique word generation means for generating a unique word corresponding in a form of 1 vs 1 to ID code using the ID code stored in the memory section, and a communication control means for simultaneously checking communication frame synchronism and a communication partner.

Cordless telephone system and generation method of a unique word thereof

A spread code series setting apparatus which sets a spread code series used in a radio or radio communication system capable of performing communication according to spread spectrum method, and has a stationary communication unit such as the master unit of a cordless telephone, capable of setting a spread code series each time a predetermined condition is met and outputting resultant spread code series setting information, in addition to which said apparatus also has a movable unit such as a subordinate unit of a cordless telephone, capable of setting a spread code series based on the spread code series setting information transmitted from the stationary communication unit in which spread code series is set in accordance with a method which has a transmitting step in which a spread code series is set in a stationary communication unit each time a predetermined condition is met and the spread code series setting information concerning the set spread code series is transmitted, and a receiving step in which spread code series, derived from the spread code series setting information, is set in the movable unit.

Method of setting spread code series and communication apparatus using

A radio communication apparatus comprises a first/second modulator for modulating a first/second signal according to a first/second frequency, a first demodulator for detecting the received first modulation signal and regenerating the carrier, a clock regenerator for regenerating a clock from the detection output from the first demodulator, an amplitude sampler for sampling the amplitude of the received first modulation signal according to the regenerated clock, a second demodulator for controlling the frequency of the received second modulation signal and executing demodulation for the signal, and a gain controller for executing gain control for the output from the second demodulator according to the output from the amplitude sampler.

Radio communication apparatus

An analog/digital receiver comprises a noise detecting circuit for checking whether a noise component, output from an analog signal detecting means, is not less than a specified value, and an RSSI detecting circuit for checking whether received signal strength, output from the receiver, is not less than a specified value. A discriminating circuit is included for making a determination as to whether the received input is an analog modulation signal or a digital modulation signal according to the result of the determination made by the noise detecting circuit as well as by the RSSI detecting circuit. A select switch selects the output from either the digital signal detecting circuit or the analog signal detecting circuit.

Analog/digital receiver

A method of suppressing generation of carrier leak in a transmitter and reducing deterioration of communication quality comprises the steps of outputting DC elements (I, Q) from a DSP gradually changing the voltage values, measuring a sum of the DC elements (.DELTA.I.sub.DC, .DELTA.Q.sub.DC) and DC elements (I, Q), storing the DC elements (I, Q), when the above sum is equal to a specified value (herein, 0 V), as DC elements -.DELTA.I.sub.DC, -.DELTA.Q.sub.DC for correction, and correcting the DC elements (I.sub.DC, Q.sub.DC) (DC elements obtained by amplifying DC elements for (I, Q) channels demodulated by a quadrature demodulator during transmission) using the DC elements (-.DELTA.I.sub.DC, -.DELTA.Q.sub.DC) for correction during transmission.

Method of correcting carrier leak in a transmitter

A cordless telephone system including a master phone connected to a telephone line and a slave phone executing communication via one of a plurality of radio channels switchable to said master phone, the master phone and slave phone each having a correlation detector for detecting a correlation value between a received signal and a reference spreading code series, a comparator for comparing the correlation valued detected by the comparator to a prespecified reference correlation value, and a control circuit continuing communication by switching a radio channel when it is determined that the correlation value is lower than the prespecified reference value.

Channel switching control method and a cordless telephone system using

A radio communication receiving device performs prescribed operations upon detecting a frequency modulation preamble signal consisting of a series of alternating logical values. The device includes a low-pass filter that is connected to an output of a receiver that detects the frequency modulation signal and outputs an analog base band signal, and which has a numerical cutoff frequency value that does not exceed half the bit rate of the preamble, a comparison circuit that is connected to the output of the low-pass filter and compares an output voltage of the low-pass filter with prescribed threshold values, and a determining circuit that determines a preamble has been detected when the comparison by the comparison circuit indicates that an absolute value the low-pass filter output voltage does not exceed a prescribed threshold value for a prescribed time period.

Radio communication receiving device detecting a frequency modulation

A cordless telephone set comprises a base unit and a handset unit connected by a radio frequency (RF) link which is established by digital burst data transmission and is synchronized by a unique word which is included in the digital burst data. The radio transmission signal is not continuous and it requires the synchronization. The unique word is detected by the unique word detecting means and is used to establish the burst data synchronization. The unite word consists of frequency channel information and fixed unite data. By using this information, the base unit and the handset unit are prevented from trying to establish a radio link at incorrect frequency when a spurious signal, not intended for the base unit and/or handset unit is erroneously received.

Growing community of inventors

Chiba, Japan

Kiyoshi Tanaka