Patent application number | Description | Published |
20080219344 | Encoding device and encoding method - When creating SBR data in a the low-resolution mode, an encoding device divides a high-frequency component of input audio data being encoded by SBR method into a high-frequency band and a low-frequency band, and calculates an average high-frequency power value that indicates the average value of the power in the high-frequency band of the audio data, as well as an average low-frequency power value that indicates the average value of the power in the low-frequency band of the audio data. The encoding device then compares the average high-frequency power value and the average low-frequency power value, selecting the smaller of the two. The encoding device then corrects the power of the high-frequency component of the signal being encoded by the SBR method so that it equals the selected average power value. | 09-11-2008 |
20080288262 | Decoding apparatus and decoding method - A decoding apparatus that decodes a first encoded data that is encoded into a first time range from a low-frequency component of an audio signal, and a second encoded data that is used when creating a high-frequency component of the audio signal from the low-frequency component and encoded into a second time range, into the audio signal. In the decoding apparatus, a high-frequency component compensating unit that compensates the high-frequency component created from the second encoded data based on the first time range. A decoding unit that decodes into the audio signal by synthesizing the high-frequency component compensated by the high-frequency component compensating unit, and the low-frequency component decoded from the first encoded data. | 11-20-2008 |
20090070120 | Audio regeneration method - According to an aspect of an embodiment, a method for regenerating an audio signal including a low frequency component and a high frequency component by decoding a coded data including a first coded data and a second coded data, the method comprising the steps of: generating the low frequency component; generating the high frequency component; determining whether the low frequency component has transient characteristics or not; generating a low frequency correction component by removing a stationary component when the audio signal has the transient characteristics; generating a corrected high frequency component by correcting the high-frequency component on the basis of the duration of the low frequency correction component when the audio signal has the transient characteristics; and regenerating the audio signal by synthesizing the low frequency component with the corrected high-frequency component. | 03-12-2009 |
20090210235 | ENCODING DEVICE, ENCODING METHOD, AND COMPUTER PROGRAM PRODUCT INCLUDING METHODS THEREOF - A disclosed encoding device converts an audio signal into frequency spectra, determines allowable error powers with respect to bands divided by the frequency of the audio signal by a predetermined with, detects a tonal frequency spectrum from the frequency spectra, and detects a band containing the frequency spectrum. Using the detection result and the allowable error powers, the encoding device performs correction such that allowable error powers determined by a power determining unit with respect to bands adjacent to the band detected by a detecting unit become smaller than the powers of the frequency spectra with respect to the adjacent bands, and quantizes each of frequency spectra having greater powers than the corrected allowable error powers. | 08-20-2009 |
20090256705 | Sensing apparatus, sensor information gathering apparatus, sensing method, and remote sensing method - A sensing apparatus which controls the detection timing of a sensor by a prescribed guidance signal includes a guidance signal analyzing unit for analyzing the prescribed guidance signal, and a sensing control unit for determining, based on the result of the detection, an effective detection period during which an output of the sensor is effective. | 10-15-2009 |
20100017201 | Data embedding apparatus, data extraction apparatus, and voice communication system - A voice communication system having, on a transmission side, a data embedding apparatus provided with an embedding allowability judgment unit ( | 01-21-2010 |
20100080397 | AUDIO DECODING METHOD AND APPARATUS - A decoded sound analysis unit ( | 04-01-2010 |
20100106511 | Encoding apparatus and encoding method - An encoding apparatus converts an input signal into a frequency-domain spectrum signal, divides the converted spectrum signal into an arbitrary number of segments with respect to a time axis and a frequency axis, calculates a spectrum power of each segment and a feature parameter that represents a feature of the corresponding spectrum power, calculates a masking threshold using the calculated spectrum power of each segment, detects a segment having a spectrum power equal to or less than the calculated masking threshold, corrects the spectrum power of the detected segment, and encodes both the spectrum power of the corrected segment and the calculated parameter. | 04-29-2010 |
20100153120 | AUDIO DECODING APPARATUS AUDIO DECODING METHOD, AND RECORDING MEDIUM - An audio decoding method includes: acquiring, from encoded audio data, a reception audio signal and first auxiliary decoded audio information; calculating coefficient information from the first auxiliary decoded audio information; generating a decoded output audio signal based on the coefficient information and the reception audio signal; decoding to result in a decoded audio signal based on the first auxiliary decoded audio signal and the reception audio signal; calculating, from the decoded audio signal, second auxiliary decoded audio information corresponding to the first auxiliary decoded audio information; detecting a distortion caused in a decoding operation of the decoded audio signal by comparing the second auxiliary decoded audio information with the first auxiliary decoded audio information; correcting the coefficient information in response to the detected distortion; and supplying the corrected coefficient information as the coefficient information when generating the decoded output audio signal. | 06-17-2010 |
20100169080 | AUDIO ENCODING APPARATUS - An audio encoding apparatus that encodes audio signals of a plurality of channels, includes an adaptive bit allocation control unit that adaptively controls a number of encoding bits assigned to the audio signal of each channel in accordance with perceptual entropy of the audio signal of each of the channels,
| 07-01-2010 |
20100174960 | Decoding apparatus, decoding method, and recording medium - A decoding apparatus includes a unit decoding and inversely quantizing coded data to obtain frequency domain audio signal data, a unit computing from the coded data one of the number of scale bits composed of the number of bits corresponding to the scale value of the coded data and the number of spectrum bits composed of the number of bits corresponding to the spectrum value of the coded data, a unit estimating a quantization error of the frequency domain audio signal data based on one of the number of scale bits and the number of spectrum bits of the coded data, a unit computing a correction amount based on the estimated quantization error and correct the frequency domain audio signal data obtained by the frequency domain data obtaining unit based on the computed correction amount, and a unit converting the corrected frequency domain audio signal data into the audio signal. | 07-08-2010 |
20100228552 | Audio decoding apparatus and audio decoding method - An audio decoding apparatus and method are provided. The audio decoding apparatus includes a spectrum converting part configured to divide the first frequency spectrum in each channel of the first audio signal in a time direction or in a frequency direction to calculate a first signal sequence having the same time resolution and the same frequency resolution in all the channels of the first audio signal, a down-mixing part configured to perform weighted addition on the signals at the same time and within the same frequency band included in the first signal sequence in all the channels to calculate a second signal sequence having channels of a second number different from the first number of channels. | 09-09-2010 |
20100273522 | Wireless communication apparatus - In a wireless communication apparatus, an ambient apparatus number measurement unit measures the number of wireless apparatuses existing around. A movement amount measurement unit detects acceleration at the time when its own apparatus moves and measures the movement amount of its own apparatus. An ambient sound analysis unit records ambient sounds and analyzes the recorded ambient sounds to generate ambient sound analysis information. A communication controller estimates surroundings of its own apparatus based on at least one of the number of the measured wireless apparatuses, the measured movement amount, and the ambient sound analysis information, and autonomously performs a communication control of its own apparatus according to the estimated surroundings. | 10-28-2010 |
20100329470 | AUDIO INFORMATION PROCESSING APPARATUS AND METHOD - An audio information processing apparatus and method include dividing an audio signal, determining a time period having a power change ratio of an audio signal larger than a first threshold value as an attack candidate, searching the time period of the attack candidate and a time period immediately before the time period of the attack candidate for an attack starting point, correcting a power of an audio signal included in the time period, and determining whether a power change ratio of the audio signal included in the time period is larger than a second threshold value for attack detection which is larger than the first threshold value. | 12-30-2010 |
20110002393 | AUDIO ENCODING DEVICE, AUDIO ENCODING METHOD, AND VIDEO TRANSMISSION DEVICE - An audio encoding device includes, a time-frequency transform unit that transforms signals of channels included in an audio signal having a first number of channels into frequency signals respectively, a down-mix unit that generates an audio frequency signal having a second number of channels, a low channel encoding unit that generates a low channel audio code by encoding the audio frequency signal, a space information extraction unit that extracts space information representing spatial information of a sound, an importance calculation unit that calculates importance on the basis of the space information, a space information correction unit that corrects the space information, a space information encoding unit that generates a space information code, and a multiplexing unit that generates an encoded audio signal by multiplexing the low channel audio code and the space information code. | 01-06-2011 |
20110178806 | ENCODER, ENCODING SYSTEM, AND ENCODING METHOD - An encoding device includes, an estimation unit to estimate a decoded signal of a plurality of channels based on a down-mix signal obtained by down-mixing an input signal of the plurality of channels, similarity between the channels of the input signal, and an intensity difference between the channels of the input signal; an analysis unit to analyze a phase of the input signal and a phase of the decoded signal; a calculation unit to calculate phase information based on the phase of the input signal and the phase of the decoded signal; and a coding unit to encode the similarity between the channels of the input signal, the intensity difference between the channels of the input signal, and the phase information. | 07-21-2011 |
20110208514 | DATA EMBEDDING DEVICE AND DATA EXTRACTION DEVICE - A data embedding device for embedding data in a speech code obtained by encoding a speech in accordance with a speech encoding method based on a voice generation process of a human being, includes an embedding judgment unit, every speech code, judging whether or not data should be embedded in the speech code, and an embedding unit embedding data in two or more parameter codes of a plurality of parameter codes constituting the speech code for which it is judged by the embedding judgment unit that the data should be embedded. | 08-25-2011 |
20110211035 | VOICE COMMUNICATION APPARATUS AND VOICE COMMUNICATION METHOD - A communication apparatus includes an image capturing unit configured to capture a face image of a user; a contour extraction unit configured to extract a face contour from the face image captured by the image capturing unit; an ear position estimation unit configured to estimate positions of ears of the user on the basis of the extracted face contour; a distance estimation unit configured to estimate a distance between the communication apparatus and the user on the basis of the extracted face contour; a sound output unit configured to output sound having a directivity; and a control unit configured to control an output range of sound output from the sound output unit on the basis of the positions of ears of the user estimated by the ear position estimation unit and the distance between the communication apparatus and the user estimated by the distance estimation unit. | 09-01-2011 |
20110246139 | DOWNMIXING DEVICE AND METHOD - A downmixing device includes: a matrix conversion unit configured to perform a matrix operation for an input signal; a rotation correction unit configured to rotate an output signal of the matrix conversion unit; a spatial information extraction unit configured to extract spatial information from the output signal of the rotation correction unit; and an error calculation unit configured to calculate an error amount of the matrix operation result for the input signal by performing a matrix operation for the output signal of the rotation correction unit and the spatial information extracted by the spatial information extraction unit using a matrix that is inverse to the matrix used for the matrix operation by the matrix conversion unit. | 10-06-2011 |
20120078632 | VOICE-BAND EXTENDING APPARATUS AND VOICE-BAND EXTENDING METHOD - An optical device includes a fast Fourier transform (FFT) unit, a signal noise ratio (SNR) calculation processing unit, a band selecting unit, an extension-signal creating unit, an addition unit, and an inverse fast Fourier transform (IFFT) unit. The FFT unit performs the Fourier transform on an input signal that is input from the outside. The SNR calculation processing unit calculates an SNR with respect to each of bands in the input signal. The band selecting unit selects a band of which SNR exceeds a threshold and is the maximum SNR, based on respective SNRs of the bands. The extension-signal creating unit creates an extension signal based on a signal acquired by the band selecting unit. The addition unit adds the extension signal to the input signal, and creates a band-extended signal. The IFFT unit performs the inverse fast Fourier transform on the band-extended signal, and creates an output signal. | 03-29-2012 |
20120078640 | AUDIO ENCODING DEVICE, AUDIO ENCODING METHOD, AND COMPUTER-READABLE MEDIUM STORING AUDIO-ENCODING COMPUTER PROGRAM - An audio encoding device includes, a time-frequency transformer that transforms signals of channels, a first spatial-information determiner that generates a frequency signal of a third channel, a second spatial-information determiner that generates a frequency signal of the third channel, a similarity calculator that calculates a similarity between the frequency signal of the at least one first channel and the frequency signal of the at least one second channel, a phase-difference calculator that calculates a phase difference between the frequency signal of the at least one first channel and the signal of the at least one second channel, a controller that controls determination of the first spatial information when the similarity and the phase difference satisfy a predetermined determination condition, a channel-signal encoder that encodes the frequency signal of the third channel, and a spatial-information encoder that encodes the first spatial information or the second spatial information. | 03-29-2012 |
20120095755 | AUDIO SIGNAL PROCESSING SYSTEM AND AUDIO SIGNAL PROCESSING METHOD - An audio signal processing system including a time-frequency conversion unit which converts an audio signal in time domain into frequency domain in frame units so as to calculate a frequency spectrum of the audio signal, a spectral change calculation unit which calculates an amount of change between a frequency spectrum of a first frame and a frequency spectrum of a second frame before the first frame based on the frequency spectrum of the first frame and the frequency spectrum of the second frame, and a judgment unit which judges the type of the noise which is included in the audio signal of the first frame in accordance with the amount of spectral change. | 04-19-2012 |
20120136657 | AUDIO CODING DEVICE, METHOD, AND COMPUTER-READABLE RECORDING MEDIUM STORING PROGRAM - An audio coding device includes a time-to-frequency converter that performs time-to-frequency conversion on each frame of a signal in at least one channel included in an audio signal in a predetermined length of time in order to convert the signal in the at least one channel to a frequency signal; a complexity calculator that calculates complexity of the frequency signal for each of the at least one channel. The audio further includes a bit allocation controller that determines a number of bits to be allocated to each of at least one channel so that more bits are allocated to the each of the at least one channel as the complexity of the each of at least one channel increases, and increases the number of bits to be allocated as an estimation error in the number; and a coder that codes the frequency signal. | 05-31-2012 |
20120163608 | ENCODER, ENCODING METHOD, AND COMPUTER-READABLE RECORDING MEDIUM STORING ENCODING PROGRAM - An encoder includes, a degree-of-importance calculating unit that calculates a degree of importance of each of a first number of signals included in input signals; a signal converting unit that converts the first number of signals included in the input signals into a second number of signals; a degree-of-importance converting unit that converts a first number of degrees of importance, a number of which is equal to the first number of signals, calculated by the degree-of-importance calculating unit into a second number of degrees of importance, a number of which is equal to the second number of signals; a number-of-bits determining unit that determines a number of bits for use in quantizing each of the second number of signals obtained by the conversion performed by the signal converting; and a quantizing unit that quantizes each of the second number. | 06-28-2012 |
20120190996 | SLEEP APNEA SYNDROME TESTING APPARATUS, TEST METHOD FOR SLEEP APNEA SYNDROME AND TANGIBLE RECORDING MEDIUM RECORDING PROGRAM - A sleep apnea syndrome testing apparatus includes: an analyzing unit that analyzes every unit time a sound signal resulting from a subject during sleep; a determining unit that determines whether a unit time of the sound signal includes a breath sound or a characteristic sound produced when a patient with sleep apnea syndrome recovers from an apneic state into a breathing state, and the determining unit that determines that the sleep state of the subject in the unit time is any one of “breathing restored state,” “state with breathing,” and “state without breathing;” a storage unit in which a sleep state of the subject in each unit time is stored; and a detecting unit that detects an apneic state of the subject if a history of the sleep states of the subject indicates at least a transition from the “state without breathing” to the “breathing restored state.” | 07-26-2012 |
20120197634 | VOICE CORRECTION DEVICE, VOICE CORRECTION METHOD, AND RECORDING MEDIUM STORING VOICE CORRECTION PROGRAM - A voice correction device includes a detector that detects a response from a user, a calculator that calculates an acoustic characteristic amount of an input voice signal, an analyzer that outputs an acoustic characteristic amount of a predetermined amount when having acquired a response signal due to the response from the detector, a storage unit that stores the acoustic characteristic amount output by the analyzer, a controller that calculates an correction amount of the voice signal on the basis of a result of a comparison between the acoustic characteristic amount calculated by the calculator and the acoustic characteristic amount stored in the storage unit, and a correction unit that corrects the voice signal on the basis of the correction amount calculated by the controller. | 08-02-2012 |
20120224703 | AUDIO CODING DEVICE, AUDIO CODING METHOD, AND COMPUTER-READABLE RECORDING MEDIUM STORING AUDIO CODING COMPUTER PROGRAM - An audio coding device includes a time frequency transform unit that, with respect to each of a plurality of channels included in an audio signal, generates a time frequency signal indicating frequency components at each time by performing a time frequency transform on a signal of the channel; a transient detection unit that detects a transient with respect to each of the plurality of channels so as to obtain a transient detection time; a transient time correction unit that, when a difference in transient detection times between an early detection channel in which the transient detection time is earliest and a late detection channel that is a channel other than the early detection channel among the plurality of channels is within a range in which the transient; a grid determination unit that, with respect to each of the plurality of channels, and a coding unit that codes. | 09-06-2012 |
20120259640 | VOICE CONTROL DEVICE AND VOICE CONTROL METHOD - A voice control unit controlling and outputting a first voice signal includes an analysis unit configured to calculate an average value of a gradient of spectrum at a high frequency of an inputted second voice signal as a voice characteristic, a determination unit configured to determine an amplification band and an amplification amount of a spectrum of the first voice signal based on the gradient, and an amplification unit configured to amplify the spectrum of the first voice signal to realize the determined amplification band and the determined amplification amount. | 10-11-2012 |
20120302926 | BODY MOVEMENT DETECTING APPARATUS AND METHOD - A body movement detecting apparatus includes a time-frequency converting unit configured to convert an input acoustic signal to a frequency component, an electric power difference computing unit configured to compute an electric power difference value of the frequency component of each of predetermined frequency bandwidths, a duration computing unit configured to compute duration in which a number of the predetermined frequency bandwidths each exhibiting the electric power difference value less than a first threshold is equal to or greater than a second threshold, a similarity value computing unit configured to compute a value indicating similarity of the electric power difference value of each of the predetermined frequency bandwidths, and a body movement detecting unit configured to detect body movement based on the computed duration and the computed similarity value. | 11-29-2012 |