NEC

About: NEC is a company organization based out in Tokyo, Japan. It is known for research contribution in the topics: Signal & Layer (electronics). The organization has 33269 authors who have published 57670 publications receiving 835952 citations. The organization is also known as: NEC Corporation & NEC Electronics Corporation.

Foldable portable information terminal

Abstract: A foldable portable information terminal includes an upper unit having a display unit on its one side, a lower unit having operation keys on its one side, and a movable connecting mechanism connecting the upper unit and the lower unit allowing the upper unit to be opened, closed, and freely rotated with respect to a longitudinal direction of the lower unit. The displaying mode of the display unit whose direction varies depending on a position of the upper unit is changed depending on a positional relationship of the upper unit and the lower unit.

Modulation system capable of improving a transmission system

Abstract: In a modulation system responsive to a system input signal for supplying an amplifier having nonlinearities with a modulated analog signal to make the amplifier produce an amplified output signal, the system input signal conveys a baseband signal having a predetermined sampling rate for reproduction and is sampled into a sequence of sampled signals having a specific rate higher than the predetermined sampling rate. The sampled signal sequence is converted by a random access memory into a sequence of predistorted signals which compensate for the nonlinearities and which are modulated into the modulated analog signal. Each predistorted signal is adaptively modified at the specific rate with reference to the sampled signals and an additional input signal derived from the amplified output signal. When the sampled signal sequence is sampled at the predetermined sampling rate, the predistorted signal sequence may be produced by interpolating each of the sampled signals at the specific rate. The baseband signal may be either a digital signal or an analog one.

Method of fabricating a high dielectric constant metal oxide capacity insulator film using atomic layer CVD

Abstract: The method for fabricating a semiconductor device in accordance with the present invention has the steps of: forming a metal film as a lower electrode of a capacitor on a semiconductor substrate, followed by forming a capacity insulator film over the lower electrode by the ALCVD process; and forming an upper electrode of the capacitor on the capacity insulator film.

Preparation of Carbon Nanotubes by Arc-Discharge Evaporation

Abstract: Extremely thin graphite filaments with a tubular structure were grown in carbon deposits formed on the negative electrode during generation of fullerenes by dc carbon-arc-discharge evaporation. The filaments and small graphite particles coexist in the central portion of the deposits. Three kinds of morphologies of carbon, namely nanotubes, polyhedra and sheets were observed in transmission electron micrographs. The filaments were formed in He, Ar or CH4 gas environment at a pressure between 20-200 Torr.

Pitch pattern generation apparatus

Abstract: A pitch pattern defining intonation for a text-to-speech system is generated in accordance with a part of speech (e.g., noun, verb, adjective, adverb, etc.) of each word which can be determined more accurately than the syntactic structure of a sentence. The pitch pattern is generated in response to the combinations of parts of speech of adjacent words in a sentence based on the fact that any combination in parts of speech of two words at both sides of each word boundary reflects the strength of connection in meaning of the adjacent words.