Patent ID: 8428942
Filing Date: 2013-04-23
Classification: G10L

Abstract:
1. A method for transcoding a signal that comprises at least a first and a second data stream, wherein the first data stream is self-contained and comprises side information and a lossy encoded source signal with quantized MDCT parameters, and wherein said side information comprises data describing the quantization process by which said quantized MDCT parameters were obtained, the method comprising the steps of: extracting from the first data stream the encoded source signal and said side information; decoding said side information extracted from the first data stream; decoding the extracted encoded source signal using said decoded side information, whereby decoded reconstructed parameters are obtained; extracting from the second data stream finely quantized control parameters that were used for encoding the lossy encoded source signal, and finely quantized MDCT coefficients, wherein the finely quantized control parameters and the finely quantized MDCT coefficients are finer quantized than those extracted from the first data stream; decoding said control parameters extracted from the second data stream; conditionally decoding said finely quantized MDCT coefficients, wherein from said decoded reconstructed parameters at least the quantized MDCT parameters are used; re-quantizing and re-encoding the conditionally decoded finely quantized MDCT coefficients, wherein a bit allocation algorithm is used that is controlled according to the decoded side information, the decoded encoding control parameters and a required data rate, and wherein an encoded output signal and encoded output side information are generated; and multiplexing the encoded output signal and the encoded output side information into a transcoded signal.