Matsushita Electric Industrial Co., Ltd.

Mitsubishi Chemical Corporation

Matsushita Electric Industrial

Shohei Taniguchi

Yutaka Banba

Kenji Matsumoto

Masaru Utsunomiya

Yusuke Izawa

Masayuki Ito

Ryo Yamashita

Kazuya Toki

Makoto Yamauchi

Gaku Teshima

A polyalkylene ether glycol composition including a polyalkylene ether glycol including an alkoxy group serving as a terminal group. The polyalkylene ether glycol composition has a hydroxyl value of 220 or more and 750 or less. The ratio of the number of alkoxy group terminals of the polyalkylene ether glycol included in the polyalkylene ether glycol composition to the number of hydroxyl group terminals of polyalkylene ether glycols included in the polyalkylene ether glycol composition is 0.00001 or more and 0.0040 or less. Provided is a polyalkylene ether glycol composition having excellent compatibility with low-molecular-weight polyols, having suitable reactivity when used as a raw material for polyurethanes, and capable of achieving intended physical properties.

Polyalkylene ether glycol composition and method for producing polyurethane using the same

An object of the present invention is to provide high-purity gamma-butyrolactone (GBL) capable of preventing occurrence of reaction other than the object at the time of use, which reaction is caused due to a high acidity of GBL, and the present invention relates to a gamma-butyrolactone composition containing gamma-butyrolactone and a nitrogen-containing compound, wherein a content of the gamma-butyrolactone is 99.0% by mass or more, and a total content of the nitrogen-containing compound is 0.1 ppm by mass to 1,000 ppm by mass as converted to a nitrogen atom.

Gamma-butyrolactone composition and method for producing same

A time-division multiplexing radio system controls transmission power based on an adjacent-channel leakage power ratio with precision and stability. The system has a directional coupler arranged at an output stage of a power amplifier in a transmitter and that has outputs directed to an antenna and a receiver, and a reception RF switch arranged at an input stage of a frequency converter in a receiver and that has inputs directed to the antenna and the coupler. Under transmission, the switch is switched over to the coupler so that the receiver receives the present channel to detect transmission power thereof. Also the receiver is set to receive an adjacent channel under transmission, so that adjacent-channel leakage power is detected. Based on those pieces of detected information, the ratio is calculated. To make the power ratio meet a specified condition, the transmission power of the transmitter is controlled.

Time division multiplexing radio system for controlling transmission power

Herein disclosed is a radio signal receiving apparatus for receiving radio signals each having a base band signal component, comprising: radio signal amplifying means for amplifying the radio signals each having a signal level; base band signal producing means for producing base band signals respectively indicative of the base band signal components of the radio signals amplified by the radio signal amplifying means, the base band signals each having a signal level; controlling means for controlling the radio signal amplifying means to have the radio signal amplifying means amplify the radio signals in response to the signal level of each of the base band signals to be produced by the base band signal producing means; base band signal selecting means for periodically selecting one of the base band signals from among the base band signals produced by the base band signal producing means in response to the signal level of each of the radio signals; and base band signal outputting means for outputting the base band signal periodically selected by the base band signal selecting means to an exterior device.

Radio signal receiving apparatus and radio signal receiving method

Herein disclosed is a bidirectional digital wireless system transmitting and receiving asymmetric transmission frames comprising: a mobile station for transmitting a plurality of uplink transmission frames each including a guard frame portion and a data frame portion carrying a main information segment; and a base station for receiving the uplink transmission frames, and generating and transmitting a plurality of downlink transmission frames each including an information frame element carrying a subsidiary information segment to the mobile station, whereby the base station is operative to divide the information frame element into a predetermined number of information frame portions respectively corresponding to the guard frame portions of the uplink transmission frame with respect to time length, and generate and transmit a plurality of downlink transmission frames each including the information frame portions collectively forming an information frame element carrying a subsidiary information segment to the mobile station.

Bidirectional digital wireless system transmitting and receiving asymmetric frames

Herein disclosed is a wireless microphone system comprising a plurality of wireless microphones each having a microphone storage area having a unique global identification element stored therein, each of the wireless microphones operative to collect a voice, convert the voice thus collected into an audio signal, and transmit the audio signal and the global identification element; and a voice receiving apparatus for receiving the audio signal and the global identification element from a wireless microphone. The voice receiving apparatus includes a storage section for storing an identification table including a plurality of local identification elements in association with a plurality of global identification elements. The voice receiving apparatus is operative to assign a local identification element to the wireless microphone in accordance with the global identification element with reference to the identification table stored in the storage section, and transmit the local identification element to the wireless microphone, and the wireless microphone is operative to receive the local identification element, store the local identification element in the microphone storage area, and communicate with the voice receiving apparatus with the local identification element thus stored.

Wireless microphone system, voice receiving apparatus, and wireless microphone

An apparatus having a band-separating filter bank for separating a digital signal into a plurality of sub-band signals, to be processed or transmitted, and a band-combining filter bank for subsequently combining the resultant sub-band signals into a single digital signal, wherein each of the band-separating filter bank and band-combining filter bank incorporates a FIR low pass filter having an asymmetric impulse response, as the prototype filter of the filter bank. A significant reduction can thereby be achieved in the amount of overall group delay that results from the processing performed by these filter banks.

Digital signal sub-band separating/combining apparatus achieving band-separation and band-combining filtering processing with reduced amount of group delay

A subband encoding and a decoding system are provided. The subband encoding system measures signal levels of subband signals to determine scale factors to obtain scale factor information and produces bit allocation information based on the scale factor information, scale factor flag information indicating the fact that the scale factor information has changed from that one frame earlier, and updated scale factor information indicating the scale factor information which has changed from that one frame earlier. The subband encoding system re-quantizes the subband signals using the scale factor information and the bit allocation information to provide re-quantized output signals and constructs as an encoded output signal a frame made up of the re-quantized signals, the updated scale factor information, and the scale factor flag information. The number of subbands of the subband signals to be re-quantized is determined by an upper limit frequency of an audible band. This results in a decrease in operation load of the subband encoding and decoding systems.

Subband encoding and decoding system for data compression and decompression

An input digital audio signal is divided into sub-band signals in respective sub-bands. Scale factors of the respective sub-bands are determined on the basis of the sub-band signals for every frame. Calculation is made as to differences between the determined scale factors for a first frame and the determined scale factors for a second frame preceding the first frame. Absolute values of the calculated scale-factor differences are calculated, and data representative of the calculated absolute values are generated. The data representative of the calculated absolute values are encoded into data of a Huffman code. Sign bits are generated which represent signs of the calculated scale-factor differences. The sub-band signals are quantized in response to the determined scale factors for every frame to generate quantized samples of the sub-band signals. The Huffman-code data, the generated sign bits, and the quantized samples of the sub-band signals are combined into a bit stream.

Method and apparatus for sub-band coding and decoding

A band splitting section a splits an encoder input signal s entered into a subband encoding apparatus, into k band components. The band splitting section a outputs a subband signal s for each of n (<k) split bands, where n is determined by a processible upper-limit frequency on each application. A scale factor producing section a detects a maximum amplitude level of the subband signal s for each of n split bands. Then, the scale factor producing section a produces scale factor information s representing a normalized scale factor. A bit allocation producing section a outputs bit allocation information s for each of n split bands. A bit allocation value is assigned to each of (n&plus;1) to k split bands. A requantizng section a requalizes the subband signal s for each split band. A frame constructing section a constructs a coded frame.

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Yokohama, Japan

Shohei Taniguchi