Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Matsushita Electric Industrial Co., Ltd.

Panasonic Corporaton

Shinichi Yoshizawa

Yoshihisa Nakatoh

Tetsu Suzuki

Mototaka Yoshioka

Yoshifumi Hirose

Kenji Mizutani

Yumi Wakita

Hidetsugu Maekawa

Makoto Nishizaki

Maki Yamada

Yoshio Ohno

Keizo Matsumoto

Aiko Kawanaka

Kiyohiro Shikano

A driver monitoring device includes a detector that detects a posture of a driver in a driver's seat of a vehicle based on an image captured by an image capturing device, a determination controller that determines whether an irregular posture can impede the vehicle from traveling safely based on a condition concerning traveling of the vehicle acquired from the vehicle and the posture of the driver detected by the detector, and one or more notifiers that provide a notification concerning the irregular posture in accordance with a result of a determination made by the determination controller. The one or more notifiers refrain from providing the notification concerning the irregular posture when the result of the determination indicates that the irregular posture does not impede the vehicle from traveling safely.

Driver monitoring device and driver monitoring method

A sound separation device includes: a signal obtainment unit which obtains a plurality of acoustic signals including a first acoustic signal and a second acoustic signal; a differential signal generation unit which generates a differential signal that is a signal representing a difference in a time domain between the first acoustic signal and the second acoustic signal; an acoustic signal generation unit which generates, using at least one acoustic signal among the acoustic signals, a third acoustic signal; and an extraction unit which generates a frequency signal by subtracting, from a signal obtained by transforming the third acoustic signal into a frequency domain, a signal obtained by transforming the differential signal into a frequency domain, and generates a separated acoustic signal by transforming the generated frequency signal into a time domain.

Sound separation device and sound separation method

An audio signal processing method includes: obtaining an L signal including a sound localized closer to the left as a major component and an R signal including a sound localized closer to the right as a major component; extracting a first signal which is a component of a sound included in the L signal and localized closer to the right and a second signal which is a component of a sound included in the R signal and localized closer to the left; generating a first output signal by subtracting the first signal from the L signal and adding the second signal to the L signal and a second output signal by subtracting the second signal from the R signal and adding the first signal to the R signal; and outputting the first output signal and the second output signal.

Audio signal processing method and audio signal processing device

A vehicle counting device including: a frequency analysis unit that analyzes a frequency of a surrounding sound detected by a vehicle sound detection microphone; a vehicle sound candidate selection unit that selects, as one or more vehicle sound candidates, one or more sounds included in the surrounding sound, based on the analysis by the frequency analysis unit, each of the one or more sounds being in a frequency band where a sound pressure is greater than or equal to a predetermined threshold value; a phase curve calculation unit that calculates, for each of the one or more vehicle sound candidates, a phase curve; and a vehicle count determination unit that classifies the one or more phase curves into at least one group, based on shapes of the one or more phase curves, and determines a total number of the at least one group as the number of the nearby vehicles.

Vehicle counting device and vehicle counting method

A vehicle direction identification device includes: a frequency analysis unit which analyzes phase of the surrounding sound in each analysis section specified by predetermined frequency regions and time intervals; a sound source direction identification unit which identifies a sound source direction indicating a direction of a sound included in the vehicle sound for each analysis section; a reflection information storage unit which stores (i) state information relating to rates of occurrence each of which are a count of the analysis sections of a corresponding one of the sound source directions, and (ii) reflection patterns each of which includes an estimated vehicle direction which is a vehicle direction associated with a set of the state information; and a vehicle direction identification unit which identifies a vehicle direction by checking the rates of occurrence obtained from an identification result by the sound source direction identification unit against one of the reflection patterns.

Vehicle direction identification device, vehicle direction identification method and program therefor

A vehicle direction identification device includes: a frequency analysis unit which analyzes amplitude or phase of surrounding sound in each analysis section; a sound source direction identification unit which identifies a sound source direction included in the surrounding sound for each analysis section; a vehicle identification information storage unit which stores first vehicle identification information including a first threshold value; a first vehicle identification unit which calculates a rate of occurrence of each sound source direction and identifies the sound source direction whose rate of occurrence is equal to or exceeds the first threshold value; a second vehicle identification information calculation unit which calculates second vehicle identification information including a second threshold value smaller than the first threshold value; and a second vehicle identification unit which identifies the sound source direction whose rate of occurrence is equal to or exceeds the second threshold value.

An acceleration-deceleration determination device includes: a DFT analysis unit which calculate, from an engine sound, a frequency signal at a predetermined frequency for each of predetermined time periods; and an acceleration-deceleration determination unit which determines whether the number of engine revolutions is increasing or decreasing, by determining whether a phase of the frequency signal is increasing at an accelerating rate over time or decreasing at an accelerating rate over time.

Revolution increase-decrease determination device and revolution increase-decrease determination method

The vehicle location detection device includes: a sound source location specifying unit which calculates an attenuation amount of a sound pressure of a vehicle sound by subtracting a sound pressure detected by a sound pressure detecting unit from a sound pressure indicated by vehicle sound pressure information stored in a sound pressure information storage unit, and specifies a location where another vehicle emitting a vehicle sound is predicted to be present, by specifying a sound source location of a sound diffracted by an obstacle which is specified by a diffraction location specifying unit and serves as a diffraction point, based on the calculated attenuation amount, a rule indicating an attenuation amount dependent on a propagation distance of the sound, and a relationship indicated by diffraction information stored in a diffraction information storage unit; and a presentation unit which presents the specified location.

Vehicle location detection device and vehicle location detection method

A vehicle-in-blind-spot detecting apparatus detects a vehicle positioned in a blind spot by mounting the apparatus on an operator's vehicle. The vehicle-in-blind-spot includes a presenting unit which presents information; at least one microphone which detects a sound; a vehicle sound extracting unit which extracts a vehicle sound from the sound detected by the microphone; and a sound source direction detecting unit which detects a sound source direction of the vehicle sound extracted by the vehicle sound extracting unit. A vehicle-in-blind-spot determining unit causes the presenting unit to present the information indicating that a vehicle is found in a blind spot in the case where the sound source direction of the vehicle sound detected by the sound source direction detecting unit is a first direction representing above the vehicle-in-blind-spot detecting apparatus with respect to a ground.

Vehicle-in-blind-spot detecting apparatus and method thereof

A sound determination device () includes: an FFT unit () which receives a mixed sound including a to-be-extracted sound and a noise, and obtains a frequency signal of the mixed sound for each of a plurality of times included in a predetermined duration; and a to-be-extracted sound determination unit (()) which determines, when the number of the frequency signals at the plurality of times included in the predetermined duration is equal to or larger than a first threshold value and a phase distance between the frequency signals out of the frequency signals at the plurality of times is equal to or smaller than a second threshold value, each of the frequency signals with the phase distance as a frequency signal of the to-be-extracted sound. The phase distance is a distance between phases of the frequency signals when a phase of a frequency signal at a time t is &#x3c8;(t) (radian) and the phase is represented by &#x3c8;'(t)=mod 2&#x3c0;(&#x3c8;(t)&#x2212;2&#x3c0;ft) (where f is an analysis-target frequency).

Sound determination device, sound detection device, and sound determination method for determining frequency signals of a to-be-extracted sound included in a mixed sound

A target sound analysis apparatus capable of distinguishing between a sound having the same fundamental period as a target sound but which differs therefrom and the target sound and analyzing whether or not the target sound is contained in an evaluation sound is an target sound analysis apparatus that analyzes whether or not a target sound is included in an evaluation sound, and includes: a target sound preparation unit that prepares a target sound that is an analysis waveform to be used for analyzing a fundamental period; an evaluation sound preparation unit that prepares an evaluation sound that is an analyzed waveform in which its fundamental period will be analyzed; and an analysis unit that temporally shifts the target sound with respect to the evaluation sound to sequentially calculate differential values of the evaluation sound and the target sound at corresponding points in time, calculate an iterative interval between the points in time where the differential value is equal to or lower than a predetermined threshold value, and judge whether or not the target sound exists in the evaluation sound based on a period of the iterative interval and the fundamental period of the target sound.

Target sound analysis apparatus, target sound analysis method and target sound analysis program

Provided is a sound source localization device which can detect a source location of an extraction sound, including at least two microphones; an analysis unit () which (i) analyze frequencies of the mixed sound including the noise and received by each microphone, and (ii) generates frequency signals; and an extraction unit () which, for each source location candidate, (a) adjusts time axes of the frequency signals corresponding to the microphones, so that there is no time difference between when the mixed sound reaches one microphone from the source location candidate and when the mixed sound reaches another microphone from the source location candidate, and (b) determines frequency signals having a difference distance equal to or smaller than a threshold value, from among the frequency signals corresponding to the microphones with the time axis having been adjusted, the difference distance representing a degree of a difference in the frequency signals between the microphones, and (c) extracts the source location of the extraction sound from among the source location candidates, in accordance with a degree of matching of the determined frequency signals between the microphones.

Sound source position detector

A sound source direction detector comprises FFT analysis sections (() to()) for generating a frequency spectrum in at least one frequency band of acoustic signals for each of the acoustic signals collected by two or more microphones arranged apart from one another, detection sound identifying sections (() to()) for identifying a time portion of the frequency spectrum of a detection sound which obtains a sound source direction from the frequency spectrum in the frequency band, and a direction detecting section () for obtaining the difference between the times at which the detection sound reaches the microphones, obtaining the sound source direction from the time difference, the distance between the microphones, and the sound velocity, and outputting it depending on the degree of coincidence between the microphones of the frequency spectrum in the time portion identified by the detection sound identifying sections (() to()) in a time interval which is the time unit to detect the sound source direction.

Audio source direction detecting device

A mixed audio separation system () which separates a specific audio from among a mixed audio (S) includes a local frequency information generation unit () which obtains pieces of local frequency information (S) corresponding to local reference waveforms (S), based on the local reference waveforms (S) and an analysis waveform which is the waveform of the mixed audio (S). Each of the local reference waveforms (S) (i) constitutes a part of a reference waveform for analyzing a predetermined frequency, (ii) has a predetermined temporal/spatial resolution and (iii) includes at least one of an amplification spectrum and a phase spectrum in the predetermined frequency. The system includes: a specific audio's frequency feature value extraction unit () which performs pattern matching between a first set which is the pieces of local frequency information and a second set of pieces of frequency information (S) of a predetermined specific audio, and extracts the first set of the pieces of local frequency information (S), based on a result of the pattern matching; and an audio signal generation unit which generates a signal of the specific audio, based on the first set of the pieces of local frequency information (S) extracted by the specific audio's frequency feature value extraction unit.

Mixed audio separation apparatus

A speech recognition device is provided which includes: a language model storage unit which stores a language model indicating appearance probabilities of words or word sequences; an acoustic feature amount extracting unit and a checking unit which extract a feature amount of an inputted speech signal, and identifies the word or word sequence corresponding to the speech signal by checking the extracted feature amount with the language model stored in the language model storage unit; an obtained word signal receiving/analyzing unit which obtains and analyzes the word; and a language model adjusting unit which identifies the appearance probability of the word based on the time elapsed after obtaining the word by the obtained word signal receiving/analyzing unit and which adjusts the language model by reflecting the identified appearance probability on the language model stored in the language model storage unit.

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Osaka, Japan

Shinichi Yoshizawa