Sony Corporation

Hitachi, Ltd.

Sony Group Corporation

Keisuke Toyama

Shiro Suzuki

Minoru Tsuji

Mototsugu Abe

Keiichi Kurakazu

Yugo Kashiwagi

Tan Watanabe

Masayuki Nishiguchi

Mitsuyuki Hatanaka

Yuhki Mitsufuji

Yuuki Matsumura

Akira Inoue

Tohru Nojiri

Ryuichi Namba

Shusuke Takahashi

Thoru Nojiri

Takashi Shibuya

Kazuo Aisaka

Naoki Shibuya

Shintaro Masui

Benjamin Frederic Nettre

The present disclosure relates to an information processing apparatus, an information processing method, and a program enabling to present a feature serving as a reason and a basis of being searched, of a music piece searched in response to a request of a user. A music piece is searched on the basis of a search request of a user, and information is generated, as a response to the search request, in which a feature that is of the searched music piece and corresponds to the search request is expressed by a balloon size for each type of the feature. The present invention can be applied to a music piece agent device.

Information processing apparatus information processing method to search a music piece for reproduction

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 idwl, based on normalization information idsf, and allocates the total quantization information idwlfor quantization information idwland quantization information idwl. At this time, the quantization information calculation section limits the quantization information idwlby a limiter lim, and allocates the total quantization information idwlfor quantization information idwl. If the quantization information idwlexceeds the limiter lim, the excess is allocated for the quantization information idwl. A first normalization section and a first quantization section normalizes and quantizes a frequency spectrum mdspecin the first stage. A second normalization section and a second quantization section normalizes and quantizes a differential frequency spectrum mdspecin the second stage.

Audio coding/decoding method and apparatus using excess quantization information

A sound processing apparatus includes a sound determination portion operable to determine whether an input sound includes a first sound emitted from a particular source based on location information of the source, a sound separation portion operable to separate the input sound into the first sound and a second sound emitted from a source different from the particular source if the sound determination portion determines that the input sound includes the first sound, and a sound mixing portion operable to mix the first sound and the second sound separated by the sound separation portion at a prescribed volume ratio.

Sound processing apparatus, sound processing method and program

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 idwl, based on normalization information idsf, and allocates the total quantization information idwlfor quantization information idwland quantization information idwlAt this time, the quantization information calculation section limits the quantization information idwlby a limiter lim, and allocates the total quantization information idwlfor quantization information idwl. If the quantization information idwlexceeds the limiter lim, the excess is allocated for the quantization information idwl. A first normalization section and a first quantization section normalizes and quantizes a frequency spectrum mdspecin the first stage. A second normalization section and a second quantization section normalizes and quantizes a differential frequency spectrum mdspecin the second stage.

A signal processing apparatus includes an absolute value unit configured to convert an audio signal into absolute values, a representative value calculation unit configured to calculate representative values of consecutive sample values included in blocks of the audio signal which has been converted into the absolute values using at least maximum sample values among values of the samples included in the blocks for individual blocks, an average value calculation unit configured to determine a section which includes a predetermined number of consecutive blocks as a frame and calculate a maximum value of the representative values of the blocks included in the frame and an average value of the representative values of the blocks included in the frame, and a detector configured to detect click noise in the frame on the basis of a ratio of the maximum value to the average value.

Signal processing apparatus, signal processing method, and program

A signal processing device that identifies a piece of music of an input signal by comparing the input signal with a plurality of reference signals including only a piece of music includes a weight distribution generating section that generates a weight distribution corresponding to a likeness to music in regions of the input signal transformed into a time-frequency domain, and a similarity calculating section that calculates degrees of similarity between a feature quantity in the regions of the input signal transformed into the time-frequency domain and feature quantities in the regions of the reference signals transformed into the time-frequency domain on the basis of the weighting based on the weight distribution.

Signal processing device, signal processing method, and program

The present invention relates to an encoding device for saving the number of bits of codes. In step S, the differential value between a normalization coefficient Bto be encoded and a normalization coefficient Bfor an encoding unit Ain a band adjacent to the lower side of an encoding unit Acorresponding to the normalization coefficient Bis computed. In step S, reference is made to a table in which a differential value having a high frequency of occurrence is associated with a code having a small number of bits, and a code corresponding to the computed differential value is read. In step S, it is determined whether or not all normalization coefficients B have been encoded. If it is determined that all normalization coefficients B have been encoded, in step S, the code read in step Sis output. The present invention is applicable to an audio recorder.

Encoding device and decoding device

A method for encoding sound signals on multiple channels includes extracting an arbitrary number of sine waves from each of the sound signals. The sine waves include at least a first sine wave, extracted from a first one of the channels and having first-channel information, and a second sine wave, extracted from a second one of the channels and having second-channel information. Using the first-channel information and one of the second-channel information and sine wave information corresponding to a predetermined sine wave, one of the second-channel information and the sine wave information corresponding to the predetermined sine wave is selected as a to-be-correlated object for encoding in a correlation with the first-channel information. The correlation includes a frequency-based absolute value of a difference between frequency information included in the first-channel information and frequency information included in the second-channel information and is used to encode the first- and second-channel information.

Methods, storage medium and apparatus for encoding and decoding sound signals from multiple channels

Any disagreement of the power level before encoding an audio signal and the power level after encoding the audio signal is adjusted to improve the sound quality to the auditory sense. The present invention provides an audio signal encoding apparatus comprising, a band dividing section that divides an input audio signal by a plurality frequency sub-bands, a spectral transform section that transforms the audio signal of each frequency sub-band into a spectral signal, a normalizing section that normalizes each spectral signal by means of a scale factor and generates a normalized spectral signal, a quantizing section that quantizes each normalized spectral signal and generates a quantized spectral signal, a scale factor adjusting section that adjusts the value of the scale factor used by the normalizing section according to the normalized spectral signal and the quantized spectral signal, and an encoding section that encodes at least each quantized spectral signal and the scale factor used by the normalizing section or the scale factor adjusted by the scale factor adjusting section. The scale factor adjusting section is adapted to compare the absolute value of the difference of the energy of the normalized spectral signal and the energy of the quantized spectral signal with a first threshold value for each frequency sub-band and, if the absolute value of the difference is greater than the first threshold value, adjust the value of the scale factor used by the normalizing section so as to make the absolute value of the difference of the energies not greater than a second threshold value.

Audio signal encoding apparatus and audio signal encoding method

A sound signal encoder for high efficiency encoding of sound signals from a plurality of channels is provided which includes a to-be-correlated object setter (), to-be-correlated object selector () and a variable-length encoder (). The to-be-correlated object setter () sets, on the basis of left-channel frequency information held in a left-channel frequency information holder () and right-channel frequency information held in a right-channel frequency information holder (), index [i] indicating which ones of sine waves on the left channel are to be correlated with, namely, are to be subtracted from, sine waves on the right channel. The to-be-correlated object selector () selects a default value read from a storage unit () or index [i]-th amplitude information read from a left-channel amplitude information holder () as an object to be subtracted from the i-th amplitude information on the right channel according to the index [i]. The variable-length encoder () makes variable-length encoding of a difference resulted from subtraction of the left-channel amplitude information or default value as the to-be-correlated object from the amplitude information on the right channel.

Methods, storage medium, and apparatus for encoding and decoding sound signals from multiple channels

In an audio-information encoding apparatus, in order to encode an audio signal containing a white-noise component, an index iL indicating the energy level of the white-noise component and an index iR designating the start index of a random-number table are introduced into a code train. In an audio-information decoding apparatus (), a white-noise generating unit () uses the indices iL and iR contained in the code train, thereby generating a white-noise signal Sw(t) on the time axis, which has the same level as the white noise, and an adder () adds the white-noise signal to an audio signal Sf(t) decoded on the time axis, outputting as an output audio signal So(t).

Music information encoding/decoding device and method

In an acoustic signal encoding apparatus (), a tonal noise verification unit () verifies whether the input acoustic time-domain signals are tonal or noisy. If the input acoustic time-domain signals are tonal, tonal component signals are extracted by a tonal component extraction unit (), and tonal component parameters are normalized and quantized in a normalization/quantization unit (). The residual time-domain signals, obtained on extracting the tonal component signals from the acoustic time-domain signals, are transformed by an orthogonal transforming unit () into the spectral information, which spectral information is normalized and quantized by a normalization/quantization unit (). A code string generating unit () generates a code string from the quantized tonal component parameters and the quantized residual component spectral information.

Acoustic signal encoding method and apparatus, acoustic signal decoding method and apparatus and recording medium

The present invention relates to an information extraction apparatus capable of analyzing an acoustic signal with accuracy and high efficiency. An amplitude analysis sectiondetermines whether or not an attack or release is contained on the basis of an amplitude value for each small region of an input time-series signal. When it is determined that there is an attack or release, an analysis region setting sectionsets the portion from an attack position to a release position as an analysis region. A frequency analysis sectionanalyzes the input time-series signal by generalized harmonic analysis and outputs extracted waveform information. An extracted waveform synthesis sectionsynthesizes the extracted waveform information and outputs the information to a time-series compensation sectionThe time-series compensation sectioncompensates the signal of the synthesized result with a signal outside the analysis region and outputs an extracted waveform time-series signal to a subtraction unitThe subtraction unitgenerates a residual time-series signal from the input time-series signal and the extracted waveform time-series signal. The present invention can be applied to various audio apparatuses, voice recognition apparatuses, voice synthesis apparatuses, etc., for processing an acoustic signal.

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Tokyo, Japan

Keisuke Toyama