Nec Corporation

Kong Aik Lee

Takafumi Koshinaka

Qiongqiong Wang

Koji Okabe

Kosuke Akimoto

Ryo Mizushima

Seng Pei Liew

Learning meansgenerates a speaker embedding extracting neural network by learning a weighting factor so as to minimize a loss function indicating an error between a speaker label indicating a speaker of a voice signal and an output value output from an output layer, with respect to a neural network including an input layer that receives an input of the voice signal and the output layer that outputs the output value indicating a speaker of the voice signal. The speaker embedding extracting neural network includes a network that calculates a first accuracy from a feature in units of frames and calculates an average and a second accuracy of a posterior distribution from an average and an accuracy of a prior distribution and the feature and the first accuracy.

Learning device, method, and program

A spoofing detection apparatusincludes a multi-channel spectrogram creation unitand an evaluation unit. The multi-channel spectrogram creation unitextracts different type of spectrograms from speech data and integrates the different type of spectrograms to create a multi-channel spectrogram. The evaluation unitevaluates the created multi-channel spectrogram by applying the created multi-channel spectrogram to a classifier constructed using labeled multi-channel spectrograms as training data and classifies it to either genuine or spoof.

Neural network-based signal processing apparatus, neural network-based signal processing method, and computer-readable storage medium

A feature calculation means calculates N features for first data and N features for second data by using N feature functions for obtaining a feature for data on the basis of the data. A similarity degree calculation means calculates a similarity degree between the first data and the second data on the basis of the N features for the first data and the N features for the second data. Values of N features obtained when the same data is substituted into the N feature functions are different from each other.

Similarity degree calculator, authorization system, similarity degree calculation method, similarity degree calculation program, and method for generating similarity degree calculation program

Spoofing detection apparatus, spoofing detection method, and computer-readable storage medium

A speech feature extraction apparatusincludes a voice activity detection unitthat drops non-voice frames from frames corresponding to an input speech utterance, and calculates a posterior of being voiced for each frame, a voice activity detection process unitcalculates a function value as weights in pooling frames to produce an utterance-level feature, from a given a voice activity detection posterior, and an utterance-level feature extraction unitthat extracts an utterance-level feature, from the frame on a basis of multiple frame-level features, using the function values.

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Tokyo, Japan

Kong Aik Lee