Abstract: A voice control device includes a hearing estimate section configured to estimate hearing of a user based on a sending/received sound ratio representing a ratio of the volume of a sending sound to the volume of a received sound; a compensation-quantity calculating section configured to calculate a compensation quantity for a received signal of the received sound responsive to the estimated hearing; and a compensation section configured to compensate the received signal based on the calculated compensation quantity.

Abstract: An orthogonal transform apparatus computes either one of the real and imaginary components of the quadrature mirror filter coefficient contained in a first subinterval of a plurality of subintervals among which a coefficient sequence containing a plurality of quadrature mirror filter coefficients is divided so that the values of basis functions are symmetrically placed, by computing a sum of products of the plurality of modified discrete cosine transform coefficients and the basis functions corresponding to the subinterval, computes the other one of the real and imaginary components of the quadrature mirror filter coefficient contained in the first subinterval and the real and imaginary components of the quadrature mirror filter coefficient contained in another subintervals by performing a butterfly operation using a computed value produced as a result of the sum of products and computes each quadrature mirror filter coefficient by combining the real component and imaginary component thereof.

Abstract: A sound encoding device includes: a processor; and a memory which stores a plurality of instructions, which when executed by the processor, cause the processor to execute: converting a sound signal into a frequency signal by time-frequency converting the sound signal in a unit of a frame having a given time length; detecting a first frequency band in which a phase component of the frequency signal is random for each frame; determining outline information representative of an outline of an amplitude component of the frequency signal included in the first frequency band for each frame; encoding the frequency signal included in a frequency band other than the first frequency band for each frame; and producing a data stream including the encoded frequency signal and the outline information.

Abstract: A portable terminal device includes a vibrator configured to vibrate a housing; an analysis section configured to execute frequency analysis on an input sound from a microphone; a calculating section configured to calculate an amount of temporal change of a spectrum obtained by the analysis section for the input sound when the housing vibrates; and a control section configured to execute incoming-call control depending on the amount of temporal change calculated by the calculating section.

Abstract: A voice processing device includes a memory; and a processor configured to execute a plurality of instructions stored in the memory, the instructions includes acquiring a transmitted voice; first detecting a first utterance segment of the transmitted voice; second detecting a response segment from the first utterance segment; determining a frequency of the response segment included in the transmitted voice; and estimating an utterance time period of a received voice on a basis of the frequency.

Abstract: An audio coding device includes a memory; and a processor configured to execute a plurality of instructions stored in the memory, the instructions comprising: selecting a main lobe among a plurality of lobes detected from a frequency signal configuring an audio signal on a basis of bandwidth and power of the lobes; and coding the audio signal in such a manner that a first amount of bits per a unit frequency domain allocated to coding of the frequency signal of the main lobe is larger than a second amount of bits per the unit frequency domain allocated to the coding of the frequency signal of a side lobe as a lobe other than the main lobe.

Abstract: An orthogonal transform apparatus computes either one of the real and imaginary components of the quadrature mirror filter coefficient contained in a first subinterval of a plurality of subintervals among which a coefficient sequence containing a plurality of quadrature mirror filter coefficients is divided so that the values of basis functions are symmetrically placed, by computing a sum of products of the plurality of modified discrete cosine transform coefficients and the basis functions corresponding to the subinterval, computes the other one of the real and imaginary components of the quadrature mirror filter coefficient contained in the first subinterval and the real and imaginary components of the quadrature mirror filter coefficient contained in another subintervals by performing a butterfly operation using a computed value produced as a result of the sum of products and computes each quadrature mirror filter coefficient by combining the real component and imaginary component thereof.

Abstract: An audio processing device includes a reverb property estimating unit that estimates a reverb property at each frequency on the basis of a first audio signal and a second audio signal representing sounds of the first audio signal output by an audio output unit and collected by an audio input unit, a gain calculating unit that determines an attenuating ratio for a component of the first audio signal at each frequency such that the larger the reverb property at the frequency is, the larger the attenuating ratio for the component at the frequency becomes, and a correcting unit that attenuates the first audio signal at the each frequency in accordance with the attenuating ratio determined for each frequency.

Abstract: A voice processing device, includes, a processor; and a memory which stores a plurality of instructions, which when executed by the processor, cause the processor to execute: receiving, through a communication network, a first voice of a first user and a second voice of a second user inputted to a first microphone positioned nearer to the first user than the second user, and a third voice of the first user and a fourth voice of the second user inputted to a second microphone positioned nearer to the second user than the first user; calculating a first phase difference between the received first voice and the received second voice and a second phase difference between the received third voice and the received fourth voice; and performing at least one of: controlling transmission of the received second voice or the received fourth voice to a first speaker.

Abstract: A signal processing apparatus generates a window signal, transforms the window signal into a frequency spectrum, and adjusts an amplitude component of the frequency spectrum. Then, the signal processing apparatus applies inverse transform to the amplitude component after adjustment and to a phase component of the frequency spectrum to generate a frame signal, and identifies an overlap segment such that the absolute value of the amplitude of the frame signal at at least one end of the overlap segment becomes smaller than the absolute value of the amplitude of the frame signal at a corresponding end of an overlapping section. Then, in the identified segment, the signal processing apparatus adds and compounds the frame signal corresponding to an immediately preceding frame and the frame signal corresponding to a processing-target frame.

Abstract: A reverberation reduction device includes, a processor; and a memory which stores a plurality of instructions, which when executed by the processor, cause the processor to execute, calculating reverberation characteristics in response to an impulse response of a path of a sound from an audio output unit to an audio input unit by determining the impulse response from a first audio signal and a second audio signal that represents a sound that the audio input unit has picked up from the first audio signal reproduced by the audio output unit, and estimating a distance from the audio input unit to a sound source in accordance with at least one of a volume and a frequency characteristic of a third audio signal that represents a sound that the audio input unit has picked up from a sound from the sound source; correcting the reverberation characteristics so that the reverberation characteristics.

Abstract: A voice processing device includes a backchannel-response detector configured to detect, from a first voice signal including a voice of a first speaker, a backchannel-response segment including a voice corresponding to a backchannel response made by the first speaker, using, a start point of a first voice segment detected from the first voice signal, an end point of a second voice segment detected from a second voice signal including a voice of a second speaker uttered before the voice of the first speaker, and the number of vowels detected from the first voice segment of the first voice signal.

Abstract: A reverberation suppression device includes an analyzer configured to analyze change over time in the power of an input signal obtained from a microphone in response to sound input, and thereby compute the decrease per unit time in the power of the input signal in a reverb segment following the end of a segment in which the sound is produced; and a suppression controller configured to control a suppression gain which indicates the rate at which the input signal is attenuated, on the basis of analysis results from the analyzer.

Abstract: A voice processing apparatus includes a voice signal acquiring unit that acquires a voice signal converted to plural frequency bands from an input signal having a narrowed band; an expanding unit that generates based on a narrowband component of the voice signal acquired by the voice signal acquiring unit, an expansion band component expanding the band of the voice signal; a correcting unit that corrects the power of the expansion band component by a correction amount determined based on a noise component included in the voice signal acquired by the voice signal acquiring unit; and an output unit that outputs the voice signal of which the band has been expanded based on the expansion band component corrected by the correcting unit and based on the narrowband component of the voice signal acquired by the voice signal acquiring unit.

Abstract: An audio encoding device includes a processor; and a memory which stores a plurality of instructions, which when executed by the processor, cause the processor to execute: mixing a channel signal of a first number included in a plurality of channels contained in an audio signal as a downmix signal of a second number; calculating a residual signal representing an error between the downmix signal and the channel signal of the first number; determining a window length of the downmix signal; and performing orthogonal transformation of the downmix signal and the residual signal based on the window length.

Abstract: An audio encoding device includes a processor; and a memory which stores a plurality of instructions, which when executed by the processor, cause the processor to execute: calculating a similarity in phase of a first channel signal and a second channel signal contained in a plurality of channels of an audio signal; and selecting, based on the similarity, a first output that outputs one of the first channel signal and the second channel signal, or a second output that outputs both of the first channel signal and the second channel signal.

Abstract: A band broadening apparatus includes a processor configured to analyze a fundamental frequency based on an input signal bandlimited to a first band, generate a signal that includes a second band different from the first band based on the input signal, control a frequency response of the second band based on the fundamental frequency, reflect the frequency response of the second band on the signal that includes the second band and generate a frequency-response-adjusted signal that includes the second band, and synthesize the input signal and the frequency-response-adjusted signal.

Abstract: 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.

Abstract: A speech processing device includes a processor; and a memory which stores a plurality of instructions, which when executed by the processor, cause the processor to execute: obtaining input speech, detecting a vowel segment contained in the input speech, estimating an accent segment contained in the input speech, calculating a first vowel segment length containing the accent segment and a second vowel segment length excluding the accent segment, and controlling at least one of the first vowel segment length and the second vowel segment length.

Abstract: A voice processing device includes a processor; and a memory which stores a plurality of instructions, which when executed by the processor, causing the processor to execute: acquiring an input voice; detecting a sound period included in the input voice and a silent period adjacent to a back end of the sound period; calculating a number of words included in the sound period; and controlling a length of the silent period according to the number of words.