Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Blackberry Corporation

Research in Motion Corporation

Mistubishi Electric Corporation

Tadashi Yamaura

Hirohisa Tasaki

Satoru Furuta

Takahiro Otsuka

Keigo Kawashima

Shigeaki Suzuki

Shinya Takahashi

Tomoharu Awano

Wataru Fushimi

Kosuke Hosoya

An echo canceller device includes a band adjuster including a filter for performing band adjustment by applying a gain to a signal in a specific frequency band of an input signal, an adaptive filter for inputting a speech reception signal, updating a filter coefficient, and generating a pseudo echo signal using the updated filter coefficient, a band corrector including a filter for correcting a frequency characteristic of a signal obtained by subtracting the pseudo echo signal from an input signal, to a frequency characteristic of the input signal prior to the band adjustment, and a residual echo suppressor for suppressing an echo component that remains in a signal, by a suppression amount, and the residual echo suppressor sets the suppression amount for a signal in a specific frequency band that has been subjected to the band adjustment.

Echo canceller device and echo cancel method

An output information generator generates abstract output information unrelated to the types of outputters according to information from an input unit. Semantic interpreters of the outputters generate pieces of embodied output information from the abstract output information on the basis of monitor results from status monitors which monitor the operating statuses of the corresponding outputters. Processing performers perform processes corresponding to the pieces of embodied output information.

Multimodal information processing device

A high quality speech is reproduced with a small data amount in speech coding and decoding for performing compression coding and decoding of a speech signal to a digital signal. In speech coding method according to a code-excited linear prediction (CELP) speech coding, a noise level of a speech in a concerning coding period is evaluated by using a code or coding result of at least one of spectrum information, power information, and pitch information, and various excitation codebooks are used based on an evaluation result.

Method for speech coding, method for speech decoding and their apparatuses

A mobile wireless communication control device includes a moving object information holder that stores a communication state of each moving object which moves in a plurality of wireless zones and information showing a wireless zone to which the moving object belongs, and a call admission determinator that refers to the information held by the moving object information holder, and determines whether a moving object which is going to start communications can start the communications on the basis of the number of calls of moving objects in communication in a first wireless zone to which the moving object which is going to start the communications belongs, and the number of calls of moving objects in communication in a second wireless zone adjacent to the first wireless zone.

Mobile wireless communication control device and mobile wireless communication system

A sound source generating unitgenerates from a narrowband audio signal not passing through noise suppression a sound source signal including a fine structure of a band to be restored. On the other hand, a noise suppressing unitperforms noise suppression of the narrowband audio signal and a spectral envelope estimating unitestimates an spectral envelope of the band to be restored. A signal synthesizing unitgenerates a pseudo-audio signal by combining the sound source signal and the spectral envelope, and the band-pass filter unitpasses the pseudo-audio signal of the band to be restored, and the signal addition unitgenerates a broadband audio restoration signal by adding the pseudo-audio signal of the band to be restored to the narrowband audio signal.

Audio signal restoration device and audio signal restoration method

A candidate voice segment sequence generatorgenerates candidate voice segment sequencesfor an input language information sequenceby using DB voice segmentsin a voice segment database. An output voice segment sequence determinatorcalculates a degree of match between the input language information sequenceand each of the candidate voice segment sequencesby using a parametershowing a value according to a cooccurrence criterionfor cooccurrence between the input language information sequenceand a sound parameter showing the attribute of each of a plurality of candidate voice segments in each of the candidate voice segment sequences, and determines an output voice segment sequenceon the basis of the degree of match.

Voice synthesizer

A high quality speech is reproduced with a small data amount in speech coding and decoding for performing compression coding and decoding of a speech signal to a digital signal. Ina speech coding method according to a code-excited linear prediction (CELP) speech coding, a noise level of a speech in a concerning coding period is evaluated by using a code or coding result of at least one of spectrum information, power information, and pitch information, and various excitation code books are used based on an evaluation result.

A speech coding apparatus comprises a repetition period pre-selecting unit for generating a plurality of candidates for the repetition period of a driving excitation source by multiplying the repetition period of an adaptive excitation source by a plurality of constant numbers, respectively, and for pre-selecting a predetermined number of candidates from all the candidates generated. A driving excitation source coding unit provides both excitation source location information and excitation source polarity information that minimize a coding distortion, for each of the predetermined number of candidates, and provides an evaluation value associated with the minimum coding distortion for each of the predetermined number of candidates. A repetition period coding unit compares the evaluation values provided for the predetermined number of candidates with one another, selects one candidate from the predetermined number of candidates according to the comparison result, and furnishes selection information indicating the selection result, excitation source location code, and polarity code.

Speech coding apparatus and speech decoding apparatus

In a speech decoding method and apparatus, an adaptive code vector is obtained from an adaptive codebook, and a time series vector is obtained from an excitation codebook. Gains of the adaptive code vector and an excitation code vector are respectively decoded from a gain code. The gain of the adaptive code vector is classified into a first gain corresponding to a first noise level or a second gain corresponding to a second noise level. A value is determined based on the classifying results, and a mathematical operation is performed on the time series vector and the determined value. The adaptive code vector and the time series vector are weighted by the decoded gains, and an excitation signal is obtained by adding the weighted adaptive code vector and the weighted time series vector. A speech is synthesized using the excitation signal and a decoded linear prediction parameter.

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Tokyo, Japan

Tadashi Yamaura