An encoding device (200) includes an MDCT unit (202) that transforms an input signal in a time domain into a frequency spectrum including a lower frequency spectrum, a BWE encoding unit (204) that generates extension data which specifies a higher frequency spectrum at a higher frequency than the lower frequency spectrum, and an encoded data stream generating unit (205) that encodes to output the lower frequency spectrum obtained by the MDCT unit (202) and the extension data obtained by the BWE encoding unit (204). The BWE encoding unit (204) generates as the extension data (i) a first parameter which specifies a lower subband which is to be copied as the higher frequency spectrum from among a plurality of the lower subbands which form the lower frequency spectrum obtained by the MDCT unit (202) and (ii) a second parameter which specifies a gain of the lower subband after being copied.

Encoding device and decoding device

Provided are an audio encoding method and apparatus and an audio decoding method and apparatus in which audio signals can be encoded or decoded so that sound images can be localized at any desired position for each object audio signal. The audio decoding method generating a third downmix signal by combining a first downmix signal extracted from a first audio signal and a second downmix signal extracted from a second audio signal; generating third object-based side information by combining first object-based side information extracted from the first audio signal and second object-based side information extracted from the second audio signal; converting the third object-based side information into channel-based side information; and generating a multi-channel audio signal using the third downmix signal and the channel-based side information.

Methods and apparatuses for encoding and decoding object-based audio signals

The speech encoding apparatus (220) has a first layer encoding section (2201), a first layer decoding section (2202), a delay section (2203), a subtracting section (104), a frequency domain transforming section (101), a second layer encoding section (105) and a multiplexing section (106).

Encoding device, decoding device, and method thereof

Video decoding innovations for multithreading implementations and graphics processor unit (“GPU”) implementations are described. For example, for multithreaded decoding, a decoder uses innovations in the areas of layered data structures, picture extent discovery, a picture command queue, and/or task scheduling for multithreading. Or, for a GPU implementation, a decoder uses innovations in the areas of inverse transforms, inverse quantization, fractional interpolation, intra prediction using waves, loop filtering using waves, memory usage and/or performance-adaptive loop filtering. Innovations are also described in the areas of error handling and recovery, determination of neighbor availability for operations such as context modeling and intra prediction, CABAC decoding, computation of collocated information for direct mode macroblocks in B slices, reduction of memory consumption, implementation of trick play modes, and picture dropping for quality adjustment.

Video decoding implementations for a graphics processing unit

An audio encoder (109) has a hierarchical encoding structure and generates a data stream comprising one or more audio channels as well as parametric audio encoding data. The encoder (109) comprises an encoding structure processor (305) which inserts decoder tree structure data into the data stream. The decoder tree structure data comprises at least one data value indicative of a channel split characteristic for an audio channel at a hierarchical layer of the hierarchical decoder structure and may specifically specify the decoder tree structures to be applied by a decoder. A decoder (115) comprises a receiver (401) which receives the data stream and a decoder structure processor (405) for generating the hierarchical decoder structure in response to the decoder tree structure data. A decode processor (403) then generates output audio channels from the data stream using the hierarchical decoder structure.

Audio encoding and decoding

An audio decoding device includes an energy correction unit (105) for correcting a target energy of a higher band component and a correction coefficient calculation unit (106) for calculating an energy correction coefficient from a low sub-band signal. These processing units execute the correction processing of the target energy required when performing the band extension processing using only real numbers. Thus, instead of a complex sub-band synthesis filter and a complex band extension unit, it is possible to use a real number sub-band synthesis filter and a band extension unit requiring less calculation amount while maintaining a high sound quality. Thus, it is possible to reduce the necessary calculation amount and the device size.

Audio decoding device, decoding method, and program

An audio data input unit (310) of an encoding device 300 splits an audio data string into contiguous 4,096 samples of audio data, and a transforming unit (320) transforms the split audio data into spectral data in a frequency domain A data dividing unit (330) divides the spectral data into that in a lower frequency band and that in a higher frequency band at 11025 kHz (f1) as a boundary The spectral data in the lower frequency band is quantized and encoded by a first quantizing unit (340) and an encoding unit (350) as usual A second quantizing unit (345) generates sub information indicating a characteristic of the spectral data in the higher frequency band, and a second encoding unit (355) encodes the sub information A stream output unit (390) integrates the codes obtained by the first and second encoding units (350), (355), and outputs the integrated one Here, the f1 is a half or less of a sampling frequency f2 at which the audio data string is created

Encoding device, decoding device and audio data distribution system

An encoding device ( 200 ) is comprised of a band dividing unit ( 201 ) that divides an input signal ( 207 ) into a low frequency signal ( 208 ) representing a signal in the lower frequency band and a high frequency signal ( 209 ) representing a signal in the higher frequency band, a lower frequency band encoding unit ( 202 ) that encodes the low frequency signal ( 208 ) and generates a low frequency code ( 213 ), a similarity judging unit ( 203 ) that judges similarity between the high frequency signal ( 209 ) and the low frequency signal ( 208 ) and generates switching information ( 210 ), “n” higher frequency band encoding units 205 that encode the high frequency signal ( 209 ) through respective encoding methods and generate a high frequency code ( 212 ), a switching unit ( 204 ) that selects one of the higher frequency band encoding units ( 205 ) and has the selected higher frequency band encoding unit ( 205 ) perform encoding, and a code multiplexing unit ( 206 ) that multiplexes the low frequency code ( 213 ), the high frequency code ( 212 ) and the switching information ( 210 ), and generates an output code ( 214 ).

Encoding device, decoding device and methods thereof

An acoustic signal encoding device for down-mixing at different ratios to encode a multichannel signal with a small number of channels, and an acoustic signal decoding device for decoding the signal encoded by the acoustic signal encoding device. In these devices, weighting means (103) in the acoustic signal encoding device (100) weights input signals of two channels individually according to a down-mixing coefficient thereby to calculate the level difference of the signals of two channels weighted by a level difference calculation unit (104). A separating unit (202) in the acoustic signal decoding device (200) separates the down-mixed signals into signals of two channels with the level difference information weighted.

Naoya Tanaka

Papers

Encoding device and decoding device

Audio decoding device, decoding method, and program

Encoding device, decoding device and audio data distribution system

Encoding device, decoding device and methods thereof

Acoustic signal encoding device, and acoustic signal decoding device