Stereo coding and decoding methods and apparatuses thereof

Abstract

A method of encoding input signals (1, r) to generate encoded data (100) is provided. The method involves processing the input signals (1, r) to determine first parameters (phi1,phi2) describing relative phase difference and temporal difference between the signals (1, r), and applying these first parameters (phi1, phi2) to process the input signals to generate intermediate signals. The method involves processing the intermediate signals to determine second parameters (alpha; IID, rho) describing angular rotation of the first intermediate signals to generate a dominant signal (m) and a residual signal (s), the dominant signal (m) having a magnitude or energy greater than that of the residual signal (s). These second parameters are applicable to process the intermediate signals to generate the dominant (m) and residual (s) signals. The method also involves quantizing the first parameters, the second parameters, and dominant and residual signals (m, s) to generate corresponding quantizeddata for subsequent multiplexing to generate the encoded data (100).

Description

technical field The invention relates to methods of encoding data, for example to a method of encoding audio and / or image data with variable angular rotation of data components. Furthermore, the invention relates to encoders using these methods and to decoders for decoding the data generated by these encoders. Furthermore, the invention concerns coded data communicated via a data carrier and / or a communication network, such coded data being generated according to the method described above. Background technique Many contemporary methods are known for encoding audio and / or image data in order to generate corresponding encoded output data. An example of a contemporary method of encoding audio is MPEG-1 Layer III known as MP3, which is documented in ISO / IEC JTC1 / SC29 / WG11 MPEG, IS11172-3, Information Technology-Coding of Moving Picture and Associated Audio for Digital Storage Media at up to about 1.5Mbit / s, Part 3: Audio (Information Technology - Coding of moving pictures and...

AI Technical Summary

Problems solved by technology

Although the application of the aforementioned rotation angle α allows to reduce many of the disadvantages of M / S coding in which only a 45° rotation is applied, it is also found that these methods are problematic when applied to groups of signals, such as pairs of stereo signals, where considerable The relative mutual phase or time offset of the

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