Mitsubishi Electric Corporation

Oki Electric Industry Co., Ltd.

Mitsubishi Denki Kabushiki Kaisha

Masaru Kimura

Yoshikazu Takahashi

Masami Suzuki

Takashi Yamazaki

Kohei Teramoto

Tomoharu Awano

Bunkei Matsuoka

Tsuyoshi Nakada

Kosuke Hosoya

Fuminori Saito

Kaori Handa

Shigeaki Suzuki

Takuya Taniguchi

Hirohisa Tasaki

Satoru Furuta

Nobuaki Tanaka

Atsuyoshi Yano

Asako Omote

Tomoko Ishii

Jin Hirano

A sound collection device performs Fourier transform on a first sound reception signal outputted from a first microphone and outputs a first signal, performs Fourier transform on a second sound reception signal outputted from a second microphone and outputs a second signal, estimates an arrival direction of the voice, calculates a phase of a cross-spectrum of the first signal and the second signal, determines a mask coefficient based on an arrival direction phase table indicating a relationship between the phase and the arrival direction regarding each frequency band, the calculated phase, and the estimated arrival direction, separates a signal from the first signal or the second signal by using the mask coefficient, and performs inverse Fourier transform on the separated signal and outputs a signal of a target voice.

Sound collection device, sound collection method, and storage medium storing sound collection program

An information processing device includes a sound signal acquisition unit that acquires sound signals outputted from a mic array, an analysis unit that analyzes frequencies of the sound signals, an information acquisition unit that acquires predetermined information indicating a steering vector in a first direction as a direction from the mic array to a target sound source, and a calculation unit that calculates a filter for formation in a second direction as a direction different from the first direction based on the frequencies and the information indicating the steering vector in the first direction and calculates a steering vector in the second direction by using an expression indicating a relationship between the calculated filter and the steering vector in the second direction.

Information processing device, and calculation method

An information processing device includes a first acquisition unit that acquires a sound signal outputted from a mic, an acoustic feature detection unit that detects an acoustic feature based on the sound signal, an identification unit that identifies first discomfort condition information corresponding to a first work type of work performed by a user, among one or more pieces of discomfort condition information specifying discomfort conditions using the acoustic feature and corresponding to one or more work types, based on work type information indicating the first work type, and an output judgment unit that judges whether first masking sound should be outputted or not based on the acoustic feature detected by the acoustic feature detection unit and the first discomfort condition information.

Information processing device, sound masking system, control method, and recording medium

A frequency band expansion device includes processing circuitry to calculate a weighting coefficient based on a frequency gradient of the input signal; to generate a white noise signal; to generate a first white noise signal by performing filtering on the white noise signal; to generate a second white noise signal by regulating a phase characteristic of the white noise signal; to generate a third white noise signal by performing weighted addition on the first white noise signal and the second white noise signal by using the weighting coefficient; and to generate the output signal by adding together the input signal and a signal corresponding to the third white noise signal, wherein the processing circuitry is configured so that the phase characteristic of the second white noise signal becomes the same as the phase characteristic of the first white noise signal.

Frequency band expansion device, frequency band expansion method, and storage medium storing frequency band expansion program

An information processing device includes a first acquisition unit that acquires biological information on a user, a first judgment execution unit that executes a first judgment on whether a first discomfort condition is satisfied or not based on first discomfort condition information specifying the first discomfort condition and the biological information, a second acquisition unit that acquires a sound signal, an acoustic feature detection unit that detects an acoustic feature based on the sound signal, a second judgment execution unit that executes a second judgment on whether a second discomfort condition is satisfied or not based on second discomfort condition information specifying the second discomfort condition and the acoustic feature, and an output judgment unit that judges whether first masking sound should be outputted or not based on a result of the first judgment and a result of the second judgment.

An information presentation control device includes: an analyzer to calculate a degree of risk based on information regarding an object located around a vehicle; an occupant monitor to determine whether a driver is aware of approach of the object, based on information obtained by imaging the driver with a camera; an image processor to cause at least one of the displays to perform alerting display, based on the degree of risk; and a sound processor to cause the sound output device to generate, as an alerting sound, a sound whose sound image is controlled so that a virtual sound source is localized at a position of at least one of the at least one display, based on the degree of risk. When the driver is aware of the object, the sound processor stops generation of the alerting sound or decreases a sound volume of the alerting sound.

Information presentation control device, information presentation device, information presentation control method, and non-transitory computer-readable recording medium

A microphone array includes first and second microphones (Ma, Mb) placed on a first axis (f), a third microphone (Mc) placed on a plane (fg) formed by the first axis and a second axis (g) and at a position other than on the first axis, and a fourth microphone (Md) placed on a third axis (h), and at a position other than on the plane formed by the first and the second axes, and a processing circuit generates signals (Cx, Cy, Cz) having bidirectionality in first, second and third mutually perpendicular directions (x, y, z), and an omnidirectional signal (Cw), based on signals (Ba to Bd) obtained by sound collection by means of the first to fourth microphones. It is possible to generate signals having bidirectionality in mutually perpendicular directions, and an omnidirectional signal, without using special microphones, and without excessive restrictions with regard to the placement of the microphones.

Sound collection and playback apparatus, and recording medium

An audio signal processing apparatus includes; a first correlation component separating unit configured to predict a first signal from a second signal in a predetermined period to generate a first correlation component signal and to separate the first non-correlation component signal from the first signal by using the first correlation component signal; a second correlation component separating unit configured to predict a second signal from the first signal in the predetermined period to generate a second correlation component signal and to separate the second non-correlation component signal from the second signal by using the second correlation component signal; a correlation component synthesizing unit configured to synthesize the first correlation component signal and the second correlation component signal to generate a synthesized correlation component signal; a first gain multiplying unit configured to multiply the synthesized correlation component signal by a gain to generate a correlation component signal; a first signal adding unit configured to add a correlation component signal and a first non-correlation component signal; and a second signal adding unit configured to add the correlation component signal and the second non-correlation component signal.

Audio signal processing apparatus and audio signal processing method

An audio signal processing device includes a high pass filter to convert an input audio signal into a first audio signal and to output the first audio signal, a displacement estimation unit to estimate displacement amplitude of a speaker diaphragm when the input audio signal is inputted, a saturation processing unit to perform saturation processing to the displacement amplitude estimated in the displacement estimation unit or to a signal obtained by correcting the displacement amplitude, an audio signal generation unit to generate a second audio signal by using displacement amplitude obtained after the saturation processing in the saturation processing unit, and an output generation unit to generate an output signal by using the first and the second audio signals. With this configuration, a cracking sound of a speaker is reduced and a user is allowed to feel low frequency components.

Audio signal processing device

A device includes a HPFthat modifies frequency characteristics of a target signal; a phase correcting unitthat corrects the phase characteristics of the target signal to make the phase characteristics nearly equal to phase characteristics of the HPF; a first multiplierthat adjusts the gain of the signal output from the phase correcting unit; a second multiplierthat adjusts the gain of the signal output from the HPF; a coefficient determining unit that determines the gain coefficients of the first and second multipliersandin such a manner that the sum of the gain coefficient of the first multiplierand the gain coefficient of the second multiplierbecomes a fixed value; and an adderthat adds the two signals output from the first multiplierand second multiplier

Frequency characteristic modification device

A signal processing device includes an excessive input estimating unit that estimates excessive input of a target signal, a controller that calculates frequency characteristics which will lessen the excessive input of the target signal from the excessive input information estimated by the excessive input estimating unit, and a frequency characteristic modification unit that modifies the frequency characteristics of the target signal in accordance with the frequency characteristics the controller calculates.

Signal processing device

An audio signal processing deviceincludes a period detecting unitfor detecting the fundamental period of an input audio signal; a square wave generating unitfor generating, according to the fundamental period the period detecting unitdetects, a square wavewhose period is an integer multiple of the fundamental period; an amplitude correction coefficient generating unitfor calculating an amplitude correction coefficientapproximately equal and proportional to the intensity of the input audio signal; a first multiplierfor generating an amplitude-corrected square waveby multiplying the square waveby the amplitude correction coefficient; and an adderfor adding the amplitude-corrected square waveto the input audio signal

Filters---N divide an input signalinto N band-limited signals---N, and multipliers---N carry out dynamic range control of the N band-limited signals---N, respectively. After that, filters---N eliminate odd harmonics caused by the dynamic range control, and a signal synthesis unitcombines the signals passing through the filters---N into a single output signal

Dynamic range control apparatus

A signal processing device is provided, including a prediction error calculating unit that calculates an error signal between a left signal l(n) and a prediction signal of the left signal l (n) predicted from a right signal r(n), a gain adjusting unit that makes a gain adjustment and outputs an error signal, a first adder that adds the left signal l(n) and the error signal and outputs, and a second adder that adds the right signal r(n) and the error signal in opposite phase and outputs.

Signal processing device for processing stereo signals

A signal processing circuit has two types of filters: an IIR filterand an FIR filterhaving an equivalent transfer function at all times. In an adjustment mode in which the signal processing circuit is adjusted to have an arbitrary transfer function, the signal processing circuit makes a configuration setting to use the IIR filter. When completing the adjustment or in a signal processing mode, the signal processing circuit makes a configuration setting change to switch to the FIR filterhaving the equivalent transfer function.

Growing community of inventors

Tokyo, Japan

Masaru Kimura