Nec Corporation

Sumitomo Light Metal Industries, Ltd.

The Society of Japanese Aerospace Companies

Kawasaki Jukogyo Kabushiki Kaisha

Lenovo Innovations Limited (hong Kong)

Hideo Sano

Yasuaki Yoshino

Masaki Nakano

Shigenori Yamauchi

Shigeru Ono

Naoto Yamamoto

Shinichi Matsuda

Kazuhisa Shibue

Susumu Inumaru

Hideyuki Kondo

Toshiaki Doi

Yasushi Kita

Kiyofumi Ito

Masatugu Ogawa

A temperature of a mobile telephone set is detected, and when the temperature exceeds a predetermined first threshold, a video signal encoding unit () is changed from the predetermined normal encoding rate to a reduced encoding rate, which is lower than the predetermined normal encoding rate.

Mobile telephone set having video-phone function low in amount of heat generation

The present invention provides a high-strength aluminum alloy extruded product exhibiting excellent corrosion resistance and secondary workability and suitably used as a structural material for transportation equipment such as automobiles, railroad vehicles, and aircrafts, and a method of manufacturing the same. The aluminum alloy extruded product has a composition containing 0.6 to 1.2% of Si, 0.8 to 1.3% of Mg, and 1.3 to 2.1% of Cu while satisfying the following conditional expressions (1), (2), (3) and (4),3%&#x2266;Si %+Mg %+Cu %&#x2266;4%&#x2003;&#x2003;(1)Mg %&#x2266;1.7&#xd7;Si %&#x2003;&#x2003;(2)Mg %+Si %&#x2266;2.7%&#x2003;&#x2003;(3)Cu %/2&#x2266;Mg %&#x2266;(Cu %/2)+0.6%&#x2003;&#x2003;(4)and further containing 0.04 to 0.35% of Cr, and 0.05% or less of Mn as an impurity, with the balance being aluminum and unavoidable impurities. The cross section of the extruded product has a recrystallized structure with an average grain size of 500 &#x3bc;m or less.

High-strength aluminum alloy extruded product exhibiting excellent corrosion resistance and method of manufacturing same

A method of manufacturing a high-strength aluminum alloy extruded product which excels in corrosion resistance and stress corrosion cracking resistance, and is suitably used in applications as structural materials for transportation equipment such as automobiles, railroad carriages, and aircrafts. The method includes extruding a billet of an aluminum alloy containing 0.5% to 1.5% of Si, 0.9% to 1.6% of Mg, 0.8% to 2.5% of Cu, while satisfying the following equations (1), (2), (3), and (4),3&#x2266;Si%+Mg%+Cu%&#x2266;4&#x2003;&#x2003;(1)Mg%&#x2266;1.7&#xd7;Si%&#x2003;&#x2003;(2)Mg%+Si%&#x2266;2.7&#x2003;&#x2003;(3)Cu%/2&#x2266;Mg%&#x2266;(Cu%/2)+0.6&#x2003;&#x2003;(4)and further containing 0.5% to 1.2% of Mn, with the balance being Al and unavoidable impurities, into a solid product by using a solid die, or into a hollow product by using a porthole die or a bridge die, thereby obtaining the solid product or the hollow product in which a fibrous structure accounts for 60% or more of an area-fraction of the cross-sectional structure of the product.

Method of manufacturing high-strength aluminum alloy extruded product excelling in corrosion resistance and stress corrosion cracking resistance

In an information recording medium recording method, recording is interrupted, in recording on an information recording medium, when a predetermined interruption condition is met. A signal recorded in a recorded area is played back and a recording signal playback waveform signal is obtained. Error information indicating an error between a reference waveform signal derived by partial response equalization of a data string and the recording signal playback waveform signal is obtained. A recording condition is corrected on the basis of the error information. A recording/playback apparatus and information recording medium are also disclosed.

Information recording medium recording method, information recording/playback apparatus, and information recording medium

A power calibration apparatus identifies a calibration area divided by an EFM frame unit on an optical disc and controls writing by a writing means. According to read out information for test writing written in the optical disc, a first writing power is calculated. By setting the first recording power as an initial value and changing the first recording power by a dense degree through steps corresponding to the number of the calibration areas divided by the EFM frame unit, the apparatus urges writing by the writing means. According to the read out information for the test writing written in the optical disc, a second writing power is calculated.

Power calibration method and apparatus for optical disc

A clad billethas a core materialof which outer surface is coated by a coating material. A circular front plateis provided at the head of the clad billet. The front plateis made of the same material as the coating material. As the clad billetis extruded, the front platefirst flows out. Accordingly, instead of the core material, the front plateforms dead metal. Moreover, since this front plateis made of the same material as the coating material, a defective clad such as a three layer clad are not formed. Also, since a billet thrusting faceis tapered toward an axis A of a die at an angle of 55-85 degrees, the volume of dead metal itself is reduced, and therefore it is possible to flow out the defective clad, even if it is generated, at an early stage of extrusion.

Indirect extrusion method of clad material

Buffers 101 and 103 are provided in an input and an output of a signal processing circuit 102 for performing a data transformation between a first digital data signal and a second digital data signal, respectively, and data of one of the first and second digital data signals is interpolated by a data interpolation circuit 106 on the basis of a deviation between sampling frequencies of the first and second digital data signals detected by an out-of-sync detection circuit 104 on the basis of two clocks driving the buffers 101 and 103. Further, an amount of jitter between the two clocks driving the respective buffers 101 and 103 is detected by a jitter detection circuit 105 and the amount of interpolation data is controlled in the data interpolation circuit 106 on the basis of the amount of jitter.

Digital signal processor for detecting out-of-sync and jitter from two

In a CELP system, a coder and a decoder have identical codebooks, and the amount of data to be transmitted is compressed by transmission and reception of codebook indexes. Past excitation signals are stored in a memory and used as an adaptive codebook to improve the speech quality. The coder and the decoder each comprise memory means for storing index data for at least one frame, and means for generating an adaptive codebook afresh by initialization to zero for each frame when generating an excitation signal according to stored indexes.

Adaptive codebook

A noise suppressing circuit in a digital portable telephone which adjusts a level of signals from a microphone through an analog-to-digital converter to suppress ambient noise. An encoder producers encoded signals from output signals of the noise suppressing circuit. By suppressing ambient noise in a transmitting side, the digital portable telephone is capable of preventing an awkward feeling to a person in a receiving side.

Radio transceiver including noise suppressor

A speech encoding communication system for use with a land mobile radio telephone system which decreases an unfamiliar feeling to a sound output caused by a cyclic tone variation of background noise. On the transmission side, an audition weighting filter selectively receives a sound signal or an output of a low-pass filter for the sound signal in response to VOX mode information. In a sound absent condition based on the VOX mode information, a power quantizer outputs a power index calculated by an average of the power over a long period, and an LPC analyzer outputs a unique value as an LPC and an LSP quantizer outputs a quantized LSP index and a quantized LPC obtained when the LPC has the unique value in the sound absent condition. Further, an adaptive codebook search unit controls an adaptive codebook index to a unique value without performing searching processing. On the reception side, a power controller receives a quantized power, VOX mode information and a sound signal. When the VOX mode information represents a sound absent interval and background noise is to be produced, the power controller calculates an average of the quantized power over a long period and controls the power of the sound signal.

Speech encoding communication system

Control parameter information is written to areas of an optical disk that are not write-accessible by the host computer, when the optical disk is to be ejected from the optical disk unit, and read therefrom for use in a subsequent write or read action when the optical disk is inserted in the optical disk unit. Latest written sector and blank sector information may likewise be written and read.

Optical disk device capable of recording a control parameter on unused

In order to reduce the complexity of an adaptive digital filter used to cancel delayed network echoes, a delay circuit is arranged in series therewith and arranged to compensate for the delay inherent with a speech codec. In the case of a variable delay circuit, the degree by which the echo is delayed is detected in the adaptive digital filter and used to modify the delay time. A gain control arrangement can be provided and used to reduce the gain of the received signal when the near-end party is talking and the adaptive capacity of the adaptive digital filter is exceeded.

Method and arrangement of echo elimination in digital telecommunications

Double talk is rapidly detected for effectively preventing degradation of echo cancellation in a long distance telephone communications system. An echo estimator includes a transversal filter and receives an incoming signal and tap coefficients, and then adaptively produces an estimated echo signal. A subtractor is adapted to subtract the estimated echo signal from an echo signal applied thereto, and outputting an error signal indicating residual echo. A tap coefficient updating circuit is coupled to receive the error signal and the incoming signal and the tap coefficients, and renews the tap coefficients. A double talk detector is coupled to receive the error signal and the incoming signal and the echo signal. The double talk detector issues a double talk detection signal in the event that a cross-correlation value between the incoming and echo signals is less than a first predetermined level while an estimated echo cancellation is larger than a second predetermined level.

Arrangement and method for rapidly detecting double talk in long

A superior high-temperature strength aluminum alloy material is produced by consolidating rapdily solidified particulates of an aluminum alloy into a desired configuration, the aluminum alloy consisting of, in weight percentages, 4 to 15% Fe, and 0.5 to 8% V and the balance being essentially aluminum. The aluminum alloy may further contain at least one element selected from the group consisting of 0.5 to 8% Mo, 0.5 to 8% Ni, 0.3 to 8% Zr and 0.5 to 8% Ti and these additional components develop a further increased strength in the resulting formed materials. Since the consolidated aluminum materials above specified have a superior strength at high temperatures as well as moderate temperature without an expensive Ce, they are highly useful as economical heat-resistant materials for various applications, particularly for the fields where high strength at high temperatures and lightness of weight are required.

Growing community of inventors

Tokyo, Japan

Hideo Sano