Oki Electric Industry Co., Ltd.

Feat Limited

Kazuhiro Katagiri

Akihiko Arimitsu

Takashi Yazu

To perform an efficient and stable area sound pick-up process. The present invention relates to a sound pick-up apparatus. The sound pick-up apparatus according to the present invention includes: a means for acquiring target direction signals on the basis of beamformers of input signals supplied by a plurality of microphone arrays; a means for calculating correction coefficients for approximating target area sound components to each other, the target area sound components being included in the respective target direction signals of the plurality of microphone arrays; a means for selecting a main microphone array on the basis of the correction coefficients, the main microphone array being to be used as a criterion for extracting target area sound; and a means for correcting the target direction signals of the respective microphone arrays by using the correction coefficients with respect to the main microphone array, and extracting the target area sound on the basis of the corrected target direction signals of the respective microphone arrays.

Sound pick-up apparatus, storage medium, and sound pick-up method

There are provided a target area sound extraction unit that, based on input signals input from plural microphone arrays, acquires beam former outputs from each of the microphone arrays, and uses the acquired beam former outputs to perform target area sound extraction processing to extract a target area sound taking a target area as a sound source, so as to thereby acquire an area sound acquisition output, and a restoration device that restores components of the target area sound in a frequency bandwidth having a predetermined range that was suppressed in the target area sound extraction processing.

Sound acquisition device, computer-readable storage medium and sound acquisition method

The present invention relates to a sound pick-up apparatus. The sound pick-up apparatus according to the present invention includes: a unit configured to acquire target direction signals based on beamformer outputs of a plurality of microphone arrays; a unit configured to extract non-target area sound by performing spectral subtraction processing on the acquired target direction signals, and extract target area sound by performing spectral subtraction in a manner that a spectrum of the non-target area sound is subtracted from spectra of the target direction signals; a unit configured to perform target area sound determination processing for determining whether input signals include the target area sound; a unit configured to decide a level adjustment coefficient for adjusting a level of a mixing signal on the basis of an element including a result of the target area sound determination processing; and a unit configured to mix the extracted target area sound with a level-adjusted mixing signal obtained by adjusting the level of the mixing signal with the decided level adjustment coefficient, and output a mixed signal as an area sound pick-up result.

Sound pick-up apparatus, recording medium, and sound pick-up method

A sound pick-up device of the present disclosure acquires extracted sound as a result of extracting target area sound using non-target area sound present in a target area direction from output of a beam former, divides each of an input signal and the extracted sound into plural bands, computes a power spectrum ratio between the input signal and the extracted sound for each divided band, determines whether or not target area sound is present in the input signal by employing the power spectrum ratios for each divided band, and outputs the extracted sound as a sound pick-up result in cases in which target area sound has been determined to be present.

Sound pick-up device, program, and method

To improve, when area sound pick-up is performed to collect sounds from a sound source in a target area, the sound quality of the collected sounds. The present invention relates to a sound pick-up apparatus that performs area sound pick-up. The sound pick-up apparatus calculates a sound volume level of a mixing signal to mix with a target area sound on the basis of power of estimated noise obtained by estimating background noise included in an input signal input from a microphone array, and power of a non-target area sound, adjusts a sound volume level of the input signal, and a sound volume level of the estimated noise to mix with the mixing signal on the basis of the sound volume level of the calculated mixing signal, and generates and outputs a mixed target area sound with which the input signal that is adjusted to have the calculated sound volume level and the estimated noise that is adjusted to have the calculated sound volume level are mixed.

Sound pick-up apparatus and method

The sound collection and reproduction system reproduces comprise: a microphone array selection unit which selects a microphone arrays; an area sound collection unit which collects sounds of all areas by using the microphone arrays; an area sound selection unit which selects an area sound of an area corresponding to a specified listening position, and area sounds of surrounding areas of this area corresponding to a listening direction, in accordance with a sound reproduction environment; an area volume adjustment unit which adjusts a volume of each area sound unit in accordance with a distance from the specified listening position; and a stereophonic sound processing unit which performs a stereophonic sound process, for each area sound to which volume adjustment has been performed by the area volume adjustment unit, by using a transfer function corresponding to a sound reproduction environment.

Sound collection and reproduction system, sound collection and reproduction apparatus, sound collection and reproduction method, sound collection and reproduction program, sound collection system, and reproduction system

There is provided a sound collection apparatus, including a directionality formation unit configured to form a directionality in a direction of a target area for input signals from a plurality of microphone arrays, a target area sound extraction unit configured to correct a delay between a target area and each of the microphone arrays, and a power of a target area sound component for an output from the directionality formation unit, suppress a non-target area sound by using each output after correction, and extract a target area sound, an area sound enhancement filter formation unit, and an area sound emphasis unit.

Sound collection apparatus and method

A sound pickup device is provided, the device including (1) a directionality forming unit that forms directionality to output of a microphone array, (2) a target area sound extraction unit that extracts non-target area sound from output of the directionality forming unit, and that suppresses non-target area sound components extracted from output of the directionality forming unit so as to extract target area sound, (3) a determination information computation unit that computes determination information, (4) an area sound determination unit that determines whether or not target area sound is present using the determination information computed by the determination information computation unit, and (5) an output unit that outputs the target area sound extracted only in cases in which the target area sound is determined to be present by the area sound determination unit.

Sound pickup device, program recorded medium, and method

A sound pickup apparatus and method form a bidirectionality and a unidirectionality based on sound signals picked up by microphones arranged at vertices of a triangle. A target sound is extracted by performing a spectral subtraction operation and, with respect to each frequency, a ratio of amplitude spectra of beamformer outputs between outputs is calculated for each microphone array of a directionality forming unit. A mode or median of the calculated ratio of amplitude spectra is set as a correction coefficient which corrects power of beamformer outputs for each of the microphone arrays and a target area sound is extracted.

Sound pickup apparatus and method for picking up sound

There is provided a sound source separating apparatus including a bidirectionality forming unit configured to form a bidirectionality by use of a sound signal picked up by two microphones which are located to be horizontal with respect to the target direction, among three microphones disposed at vertexes of an isosceles right triangle, a unidirectionality forming unit configured to form a unidirectionality by use of a sound signal picked up by two microphones which are located in a same direction as the target direction, among the three microphones, and a target sound extracting unit configured to extract a target sound by performing a spectral subtraction of all outputs from the bidirectionality forming unit and the unidirectionality forming unit from a signal.

Sound source separating apparatus, sound source separating program, sound pickup apparatus, and sound pickup program

A speech segment determination device includes a frame division portion, a power spectrum calculation portion, a power spectrum operation portion, a spectral entropy calculation portion and a determination portion. The frame division portion divides an input signal in units of frames. The power spectrum calculation portion calculates, using an analysis length, a power spectrum of the input signal for each of the frames that have been divided. The power spectrum operation portion adds a value of the calculated power spectrum to a value of power spectrum in each of frequency bins. The spectral entropy calculation portion calculates spectral entropy using the power spectrum whose value has been increased. The determination portion determines, based on a value of the spectral entropy, whether the input signal is a signal in a speech segment.

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Tokyo, Japan

Kazuhiro Katagiri