Abstract: The present technology relates to a sound field collecting apparatus and method, a sound field reproducing apparatus and method and a program which enable a sound field to be reproduced accurately at lower cost. Each linear microphone array outputs a sound collection signal obtained by collecting a sound field. A spatial frequency analysis unit performs spatial frequency transform on each sound collection signal to calculate spatial frequency spectra. A space shift unit performs space shift on the spatial frequency spectra so that central coordinates of the linear microphone arrays become the same, to obtain spatially shifted spectra. A space domain signal mixing unit mixes a plurality of spatially shifted spectra to obtain a single microphone mixed signal. By mixing the sound collection signals of the plurality of linear microphone arrays in this manner, it is possible to reproduce a sound field accurately at low cost. The present technology can be applied to a sound field reproducer.

Abstract: The present technology relates to an audio processing apparatus, a method, and a program that aim at enabling a sound to be reproduced more efficiently. A head-related transfer function synthesis section previously holds a matrix of a diagonalized head-related transfer function. The head-related transfer function synthesis section synthesizes an input signal in an annular harmonic domain for reproducing a sound and the previously held and diagonalized head-related transfer function. An annular harmonic inverse transformation section performs an annular harmonic inverse transformation on a signal obtained as a result of the synthesis by the head-related transfer function synthesis section on the basis of an annular harmonic function and thereby generates a headphone driving signal in a time frequency domain. The present technology is applicable to an audio processing apparatus.

Abstract: The present technology relates to an audio processing device and method and a program, in which sound can be more efficiently reproduced. An audio processing device includes: a matrix generation unit which generates a vector for each time-frequency with a head-related transfer function obtained by spherical harmonic transform by spherical harmonics as an element by using only the element corresponding to a degree of the spherical harmonics determined for the time-frequency or on the basis of the element common to all users and the element dependent on an individual user; and a head-related transfer function synthesis unit which generates a headphone drive signal of a time-frequency domain by synthesizing an input signal of a spherical harmonic domain and the generated vector. The present technology can be applied to an audio processing device.

Abstract: The present technology relates to a sound processing apparatus, a method, and a program that can reproduce an acoustic field more appropriately. A sound source position correction unit corrects sound source position information indicating a position of each object sound source, on the basis of a hearing position of a sound, and derives corrected sound source position information. A reproduction area control unit calculates, on a basis of an object sound source signal of a sound of an object sound source, the hearing position, and corrected sound source position information obtained by the correction, a spatial frequency spectrum such that a reproduction area is adjusted in accordance with the hearing position provided inside a spherical or annular speaker array. The present technology can be applied to a sound processing apparatus.

Abstract: Methods and apparatus for performing signal processing. The signal processing comprises demultiplexing input encoded data into data including information for a segment including frames and coefficient information for a coefficient selected in the frames of the segment, and low band encoded data, decoding the low band encoded data to produce a low band signal, selecting a coefficient of a frame to be processed from a plurality of the coefficients based on the data, calculating a high band sub-band power of a high band sub-band signal of each sub-band constituting a high band signal of the frame to be processed based on a low band sub-band signal of each sub-band constituting the low band signal of the frame to be processed and the selected coefficient, and producing the high band signal of the frame to be processed based on the high band sub-band power and the low band sub-band signal.

Abstract: [Object] To enable both a reduction in the number of sound collection portions and an improvement in a resolution in estimation of a direction of a sound source to be compatible. [Solution] An information processing device including: an acquisition unit configured to acquire a sound collection result of a sound from each of one or more sound sources obtained by a sound collection portion of which positional information indicating at least one of a position and a direction is changed; and an estimation unit configured to estimate a direction of each of the one or more sound sources on a basis of a change in a frequency of a sound collected by the sound collection portion in association with a change in the positional information of the sound collection portion.

Abstract: The present technology relates to an audio processing apparatus and method capable of improving localization of an audio image at lower cost, and a program. A microphone array picks up a planar wave of the audio from a sound source. A drive signal generation unit generates a speaker drive signal of a spatial domain on the basis of a spatial frequency spectrum of a sound pickup signal acquired by the sound pickup by the microphone array. An orientation information acquisition unit acquires talker's orientation information on an orientation of a talker. A spatial filter application unit performs a filter processing on the speaker drive signal by use of a spatial filter defined by the talker's orientation information thereby to reduce spatial aliasing. The present technology can be applied to a spatial aliasing controller.

Abstract: The present technology relates to a sound processing device, method and program, in which a sound field can be more appropriately regenerated. A microphone array picks up a sound in a sound pickup space and outputs a sound pickup signal obtained as a result. A time frequency analysis unit performs time frequency conversion on the sound pickup signal and obtains a time frequency spectrum. A direction correction unit computes a correction angle for correcting a direction of the microphone array on the basis of correction mode information, image information or sensor information. A spatial frequency analysis unit performs spatial frequency conversion on the time frequency spectrum on the basis of the correction angle, thereby correcting the signal obtained by picking up the sound with the microphone array. The present technology can be applied to a sound processing device.

Abstract: The present technology relates to a sound field reproduction apparatus and method, and a program, enabled to more accurately reproduce a sound field. A spacial filter application unit obtains a virtual speaker array drive signal of an annular virtual speaker array with a radius larger than a radius of a spherical microphone array, by applying a spacial filter to a spacial frequency spectrum of a sound collection signal obtained by having the spherical microphone array collect sounds. An inverse filter generation unit obtains an inverse filter based on a transfer function from a real speaker array up to the virtual speaker array. An inverse filter application unit applies the inverse filter to a time frequency spectrum of the virtual speaker array drive signal, and obtains a real speaker array drive signal of the real speaker array. The present technology can be applied to a sound field reproduction device.

Abstract: The present technology relates to a signal processing device, a signal processing method, and a program, which are capable of reproducing an acoustic field more appropriately in accordance with content. A decoding unit decodes a multiplexed signal, and obtains a multichannel sound collection signal obtained by performing sound collection through a linear microphone array and spatial correction information for selecting a spatial correction scheme for correcting a spatial transfer characteristic. A spatial correction scheme selecting unit selects the spatial correction scheme on the basis of the spatial correction information, and a spatial transfer characteristic matrix generating unit outputs a spatial transfer characteristic matrix indicated by a selection result of the spatial correction scheme. A drive signal generating unit generates a speaker drive signal of a spatial frequency domain on the basis of the multichannel sound collection signal and the spatial transfer characteristic matrix.

Abstract: The present technology relates to a sound source separation apparatus, a method, and a program which make it possible to separate a sound source at lower calculation cost. A communication unit receives a spatial frequency spectrum of a sound collection signal which is obtained by a microphone array collecting a plane wave of sound from a sound source, and a spatial frequency mask generating unit generates a spatial frequency mask for masking a component of a predetermined region in a spatial frequency domain on the basis of the spatial frequency spectrum. A sound source separating unit extracts a component of a desired sound source from the spatial frequency spectrum as an estimated sound source spectrum on the basis of the spatial frequency mask. The present technology can be applied to a spatial frequency sound source separator.

Abstract: Methods and apparatus for performing signal processing. The signal processing comprises demultiplexing input encoded data into data including information for a segment including frames and coefficient information for a coefficient selected in the frames of the segment, and low band encoded data, decoding the low band encoded data to produce a low band signal, selecting a coefficient of a frame to be processed from a plurality of the coefficients based on the data, calculating a high band sub-band power of a high band sub-band signal of each sub-band constituting a high band signal of the frame to be processed based on a low band sub-band signal of each sub-band constituting the low band signal of the frame to be processed and the selected coefficient, and producing the high band signal of the frame to be processed based on the high band sub-band power and the low band sub-band signal.

Abstract: Methods and apparatus for performing signal processing. The signal processing comprises demultiplexing input encoded data into data including information for a segment including frames and coefficient information for a coefficient selected in the frames of the segment, and low band encoded data, decoding the low band encoded data to produce a low band signal, selecting a coefficient of a frame to be processed from a plurality of the coefficients based on the data, calculating a high band sub-band power of a high band sub-band signal of each sub-band constituting a high band signal of the frame to be processed based on a low band sub-band signal of each sub-band constituting the low band signal of the frame to be processed and the selected coefficient, and producing the high band signal of the frame to be processed based on the high band sub-band power and the low band sub-band signal.

Abstract: A voice processing apparatus includes a voice quality determining unit configured to determine a target speaker determining method used for a voice quality conversion in accordance with a determining method control value for instructing the target speaker determining method of determining a target speaker whose voice quality is targeted to the voice quality conversion, and determine the target speaker in accordance with the target speaker determining method.

Abstract: The present invention relates to a frequency band extending device and method, an encoding device and method, a decoding device and method, and a program, whereby music signals can be played with higher sound quality due to the extension of frequency bands. A bandpass filter 13 divides an input signal into multiple sub-band signals, a feature amount calculating circuit 14 calculates feature amount using at least one of the multiple divided sub-band signals and the input signal, a high frequency sub-band power estimating circuit 15 calculates an estimated value of a high frequency sub-band power based on the calculated feature amount, a high frequency signal generating circuit 16 generates a high frequency signal component based on the multiple sub-band signals divided by the bandpass filter 13, and the estimated value of the high frequency sub-band power calculated by the high frequency sub-band power estimating circuit 15.

Abstract: Methods and apparatus for performing signal processing. The signal processing comprises demultiplexing input encoded data into data including information for a segment including frames and coefficient information for a coefficient selected in the frames of the segment, and low band encoded data, decoding the low band encoded data to produce a low band signal, selecting a coefficient of a frame to be processed from a plurality of the coefficients based on the data, calculating a high band sub-band power of a high band sub-band signal of each sub-band constituting a high band signal of the frame to be processed based on a low band sub-band signal of each sub-band constituting the low band signal of the frame to be processed and the selected coefficient, and producing the high band signal of the frame to be processed based on the high band sub-band power and the low band sub-band signal.

Abstract: The present invention relates to a signal processing apparatus and a signal processing method, an encoder and an encoding method, a decoder and a decoding method, and a program capable of reproducing music signal having a better sound quality by expansion of frequency band. A high band decoding circuit decodes high band encoded data outputs a coefficient table having coefficients for the respective high band sub-bands, which are specified by a coefficient index obtained as a result of decoding. A decoding high band sub-band power calculation circuit calculates decoded high band sub-band powers for the respective high band sub-bands based on low band signals and the coefficient table, and a decoded high band signal production unit produces decoded high band signals from these decoded high band sub-band powers.

Abstract: There is provided an input device including at least two microphones placed at different positions on a chassis to face different directions on one of space axes, a low-frequency bandwidth extracting part for extracting a low-frequency bandwidth signal from a signal input from the microphones, a phase difference calculating part for calculating a phase difference using the low-frequency bandwidth signal extracted by the low-frequency bandwidth extracting part; and a control signal generating part for generating a control signal based on the phase difference calculated by the phase difference calculating part.

Abstract: The present technology relates to a sound field collecting apparatus and method, a sound field reproducing apparatus and method and a program which enable a sound field to be reproduced accurately at lower cost. Each linear microphone array outputs a sound collection signal obtained by collecting a sound field. A spatial frequency analysis unit performs spatial frequency transform on each sound collection signal to calculate spatial frequency spectra. A space shift unit performs space shift on the spatial frequency spectra so that central coordinates of the linear microphone arrays become the same, to obtain spatially shifted spectra. A space domain signal mixing unit mixes a plurality of spatially shifted spectra to obtain a single microphone mixed signal. By mixing the sound collection signals of the plurality of linear microphone arrays in this manner, it is possible to reproduce a sound field accurately at low cost. The present technology can be applied to a sound field reproducer.

Abstract: There is provided an audio coding device which appropriately sets the quantization bit number by a small calculation amount in each stage when coding an input audio signal by performing multi-stage normalization/quantization. A quantization information calculation section determines total quantization information idwl0, based on normalization information idsf, and allocates the total quantization information idwl0 for quantization information idwl1 and quantization information idwl2. At this time, the quantization information calculation section limits the quantization information idwl1 by a limiter lim1, and allocates the total quantization information idwl0 for quantization information idwl1. If the quantization information idwl1 exceeds the limiter lim1, the excess is allocated for the quantization information idwl2. A first normalization section and a first quantization section normalizes and quantizes a frequency spectrum mdspec1 in the first stage.