Cear, Inc.

Kyoei Engineering Co., Ltd.

Dimagic Co., Ltd.

Freecle Inc.

Yoshitaka Murayama

Akira Gotoh

Yasushi Honda

Akira Goto

Hareo Hamada

Sosuke Kubo

Taichi Sekiguchi

A hearing assistance device which is worn by the user and which can suppress the voices produced by the user wearing the hearing assistance device is provided. When the user wears the hearing assistance device, a pair of microphones is separated and positioned on both sides of a head of the user and a pair of speakers is separated and positioned on both ears of the user or positioned near the ears and which emits sound. The hearing assistance device includes a noise cancellerwhich subtracts a signal processed by a mouth directivity sound processorfrom the input signal from at least one of the microphones L and R, in which the mouth directivity sound processoremphasizes voice produced from a sound source positioned at a mouth of the user.

Hearing assistance device

A sound processing device includes an equalizer that tunes the frequency characteristic so that a frequency characteristic of the sound wave listened in a second environment replicates the frequency characteristic of a sound wave listened in a first environment. A plurality of the equalizers is provided corresponding to a plurality of sound image signals that has respective sound images to be localized in different directions. In addition, the equalizer performs a unique frequency characteristic changing process to the corresponding sound image signal. Each equalizer has a transfer function that cancels the unique change to the frequency characteristic caused in accordance with the sound localization direction of the sound image signal.

Sound processing device, sound processing method, and sound processing program

Filtering containing a delay by a specific time is performed on one of the pair of input signals are input from microphones L, R. After the filtering, a pair of input signals InL and InR are alternately interchanged for each sampling by an interchanging circuit 2 to generate a pair of interchanged signals InA and InB. The one interchanged signal InB is multiplied by a coefficient m by an coefficient updating circuit 3 to generate an error signal of the interchanged signals InA and InB. The recurrence formula of the coefficient m containing the error signal is calculated to update the coefficient m for each sampling. The pair of input signals InL and InR are multiplied by the sequentially updated coefficient m and are output.

Sound-source separation method, apparatus, and program

Directivity control method and device which can emphasize or suppress sound deriving from an arbitrary direction with a little computation using two microphones closely disposed are provided. An interchange circuitalternately interchanges a pair of input signals InL, InR for each one sample to generate a pair of interchanged signals InA, InB. A coefficient updating circuitmultiplies the one InB of the interchanged signals by a coefficient m to generate an error signal between the interchanged signals InA, InB. A recurrence formula of the coefficient m containing the error signal is calculated to update the coefficient m for each one sample. Subsequently, the pair of input signals InL, InR are multiplied by the sequentially updated coefficient m, and output.

Directivity control method and device

To provide a sound collection system using a plurality of microphones arranged in the proximity to one another and having an excellent directivity for an arbitrary position in the sound field space. A plurality of control points are set around a plurality of sound collecting microphones. A desired response function matrix A (&#x3c9;) and a transfer function matrix C (&#x3c9;) between the control points and the respective microphones are measured. A control filter H arranged in a digital signal processing unit () is connected to each of the microphones constituting the sound collection device (). The control filters H are arranged for the number of output channels of a reproduction unit (). An output of each of the control filters H is added for each channel and outputted to each channel of the reproduction unit (). By specifying a microphone directivity upon sound collection at a control point, the control filters H are decided according to the measured desired response function matrix A (&#x3c9;) and the transfer function matrix C (&#x3c9;) of the specified control point.

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Yashio, Japan

Yoshitaka Murayama