6 results about "Spectral band replication" patented technology

To provide time alignment of encoded data of an audio encoder with associated metadata, such as spectral band replication (SBR) metadata.SOLUTION: An audio decoder (100, 300) configured to determine reconstructed frames of an audio signal (237) from access units (110) of a received data stream is described. The access unit (110) includes waveform data (111) and metadata (112), where the waveform data (111) and the metadata (112) are associated with a same reconstructed frame of the audio signal (127). An audio decoder (100, 300) comprises a waveform processing path (101, 102, 103, 104, 105) configured to generate a plurality of waveform subband signals (123) from waveform data (111), and a metadata processing path (108, 109) configured to generate decoded metadata (128) from metadata (111).SELECTED DRAWING: Figure 1

An apparatus for audio decoding according to an embodiment is provided. The device comprises a decoding module which is used for decoding a received coded audio signal to obtain a decoded audio signal. Further, the apparatus comprises a first spectral band replication module for performing spectral band replication in accordance with the decoded audio signal according to a first spectral band replication pattern to obtain a spectral band replication audio signal. Further, the apparatus comprises a second spectral-band copy module for performing spectral-band copy from the decoded audio signal according to a second spectral-band copy mode different from the first spectral-band copy mode to obtain a spectral-band copy audio signal. To perform band replication, the second band replication module is configured to perform one or more first processing operations and one or more second processing operations. The one or more second processing operations are dependent on the one or more first processing operations. The apparatus is configured to receive side information. The second spectral band replication module exhibits a state dependent on the side information, the state being one of a deactivated state and one or more activated states. The second band replication module is configured to not perform any operation when the second band replication module is in a deactivated state. Further, the second spectral band duplication module is configured to perform at least one of the one or more first processing operations and the one or more second processing operations when the second spectral band duplication module is not in the deactivated state.

An apparatus for audio decoding according to one embodiment is provided. The apparatus comprises a decoding module for decoding a received encoded audio signal in order to obtain a decoded audio signal. Furthermore, the apparatus comprises a first spectral band replication module for performing spectral band replication in accordance with a decoded audio signal according to a first spectral band replication mode in order to obtain a spectral band replication audio signal. Furthermore, the apparatus comprises a second spectral band replication module for performing spectral band replication in accordance with a decoded audio signal according to a second spectral band replication mode in order to obtain a spectral band replication audio signal, the second spectral band replication mode being different from the first spectral band replication mode. In order to perform spectral band replication, the second spectral band replication module is configured to perform one or more first processing operations and one or more second processing operations. One or more second processing operations depend on one or more first processing operations. The apparatus is configured to receive side information. The second spectral replication module exhibits a state that depends on the side information, and the state is one of an inactive state and one or more activated states. The second spectral band replication module is configured not to perform any operations when the second spectral band replication module is in an inactive state. Furthermore, the second spectral band replication module is configured to perform at least one of one or more first processing operations and one or more second processing operations when the second spectral band replication module is not in an inactive state.

Embodiments relate to an audio processing unit for decoding an encoded audio bitstream, the audio processing unit includes a buffer, bitstream payload deformatter and a decoding subsystem configured to decode the encoded audio bitstream, wherein the encoded audio bitstream includes a fill element with an 5 identifier indicating a start of the fill element and fill data after the identifier. The fill data includes at least one flag identifying whether a base form of spectral band replication or an enhanced form of spectral band replication is to be performed on audio content of the encoded audio bitstream. A corresponding method for decoding an encoded audio bitstream is also provided. 10 (FIG. 7) 5 10 20 26 20 50 24 26 J un 2 02 6 A B S T R A C T 2 0 2 6 2 0 5 0 2 4 2 6 J u n 2 0 2 6 5 1 0

The present document relates to time-alignment of encoded data of an audio encoder with associated metadata, such as spectral band replication (SBR) metadata. An audio decoder (100, 300) configured to determine a reconstructed frame of an audio signal (237) from an access unit (110) of a received data stream is described. The access unit (110) comprises waveform data (111) and metadata (112), wherein the waveform data (111) and the metadata (112) are associated with the same reconstructed frame of the audio signal (127). The audio decoder (100, 300) comprises a waveform processing path (101, 102, 103, 104, 105) configured to generate a plurality of waveform subband signals (123) from the waveform data (111), and a metadata processing path (108, 109) configured to generate decoded metadata (128) from the metadata (111).

The modalities refer to an audio processing unit that includes a buffer, a bitstream payload deformatter, and a decoding subsystem. The buffer stores at least one block of an encoded audio bitstream. The block includes a padding element that begins with an identifier followed by padding data. The padding data includes at least one flag that identifies whether enhanced spectral band replication (eSBR) processing is to be performed on the block's audio content. A corresponding method for decoding an encoded audio bitstream is also provided.