摘要:
A downscaled version of an audio decoding procedure may more effectively and/or at improved compliance maintenance be achieved if the synthesis window used for downscaled audio decoding is a downsampled version of a reference synthesis window involved in the non-downscaled audio decoding procedure by downsampling by the downsampling factor by which the downsampled sampling rate and the original sampling rate deviate, and downsampled using a segmental interpolation in segments of 1/4 of the frame length.
摘要:
Audio receiver processor for processing an error protected frame, comprising: a receiver interface (300) for receiving the error protected frame to obtain a received error protected frame; an error protection processor (302) for processing the received error protected frame to obtain an encoded audio frame, wherein the error protection processor is configured to check whether a codeword of a first predefined subset of codewords of the encoded audio frame comprises an error, and an error concealer or an error concealment indicator (304) configured to perform a frame loss concealment operation or to generate a frame loss concealment indication in case of a detected error in the first predefined subset of the codewords.
摘要:
A downscaled version of an audio decoding procedure may more effectively and/or at improved compliance maintenance be achieved if the synthesis window used for downscaled audio decoding is a downsampled version of a reference synthesis window involved in the non-downscaled audio decoding procedure by downsampling by the downsampling factor by which the downsampled sampling rate and the original sampling rate deviate, and downsampled using a segmental interpolation in segments of 1/4 of the frame length.
摘要:
A downscaled version of an audio decoding procedure may more effectively and/or at improved compliance maintenance be achieved if the synthesis window used for downscaled audio decoding is a downsampled version of a reference synthesis window involved in the non-downscaled audio decoding procedure by downsampling by the downsampling factor by which the downsampled sampling rate and the original sampling rate deviate, and downsampled using a segmental interpolation in segments of 1/4 of the frame length.
摘要:
There are provided methods and apparatus for encoding/decoding audio signal information. The encoder may determine if a signal frame is useful for long term post filtering (LTPF) and/or packet lost concealment (PLC) and may encode information in accordance to the results of the determination. The decoder may apply the LTPF and/or PLC in accordance to the information obtained from the encoder.
摘要:
There are provided methods and apparatus for performing modified cosine transformation (MDCT) with an analysis/synthesis windowing function, using an analysis windowing function (40, 50, 60, 70, 90) having a meandering portion (44, 64, 94) which passes a linear function (40', 60') in correspondence of at least four points (#1, #2, #3, #4).
摘要:
A downscaled version of an audio decoding procedure may more effectively and/or at improved compliance maintenance be achieved if the synthesis window used for downscaled audio decoding is a downsampled version of a reference synthesis window involved in the non-downscaled audio decoding procedure by downsampling by the downsampling factor by which the downsampled sampling rate and the original sampling rate deviate, and downsampled using a segmental interpolation in segments of 1/4 of the frame length.
摘要:
The invention relates to a method for the generation of a scalable data stream, whereby, if there is a block (11) of output data from a first encoder, said block of output data is written to the scalable data stream. If there is output data (0) from a second encoder for a preceding time, said output data, for the preceding section in the direction of transmission, is written in the data stream behind the block (11) of output data from the first encoder. If there is output data (1) from the second encoder for the current section, the output data from the second encoder is written in the bit-stream, connected to the output data from the first encoder. A determining data block (200) is generated and written in the bit-stream after a delay (250), corresponding to the size of the bit-store of the second encoder. Further, buffer information (260) is written in the bit-stream which shows where the beginning of the output data from the second encoder for the current section is located relative to the determining data block, whereby said buffer information (260) corresponds to the bit-store status. It is thus possible to signal a bit-store in a scalable data stream in a simple manner. Furthermore, the maximum size of the bit-store can be set according to the given decoder delay and communicated to a decoder without using additional bits by positioning of the determining data block in the scalable data, in order to reduce the initial delay of the decoder.