Device, system and method for coding and decoding

An encoding device and encoding technology, applied in the field of encoding and decoding devices, can solve the problems that the phase cannot be changed directly, and cannot be used.

Active Publication Date: 2009-12-16
HONOR DEVICE CO LTD
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Problems solved by technology

[0004] In the process of realizing the present invention, the inventors found that the above prior art has at least the following defects: the existing parametric stereo coding methods are all parametric stereo coding in the complex frequency domain, if the discrete Cosine transform domain (MDCT), such as G.VBR and G.729.1, because the phase cannot be changed directly like the FFT domain or QMF domain, so this method cannot be used

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  • Device, system and method for coding and decoding
  • Device, system and method for coding and decoding
  • Device, system and method for coding and decoding

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Embodiment Construction

[0059]The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0060] see figure 1 with figure 2 A codec system applicable to stereo signals in this embodiment of the present invention includes an encoding device 10 and a decoding device 20 . The encoding device 10 includes an MDCT transformation module 11 , a parameter acquisition module 12 , a quantization module 13 , a downmix module 14 (Down Mix), an encoding module 15 , and a composite module 16 . Wherein, the MDCT transformation module 11 , the parameter acquisition mo...

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Abstract

The embodiment of the invention provides a device, a system and a method for coding and decoding, which are applied to a stereo signal. The method comprising the following steps: acquiring a stereo parameter of the stereo signal to be coded, which is converted in an MDCT field, and performing quantification processing on the stereo parameter; downwards mixing the stereo signal into a signal-channel signal code; compounding and sending the quantified stereo parameter and a coded signal; decoding and compounding the data to be decoded into the stereo parameter and the coded signal; decoding andquantifying the stereo parameter; decoding the coded signal into a single-channel signal; acquiring decorrelation signals of the single-channel signal in the MDCT field; and synthesizing and restoring the quantified stereo parameter, the single-channel signal and the decorrelation signals to the stereo signal. The device, the system and the method for coding and decoding are used for coding stereo and can solve the problem how to obtain two paths of left and right channel stereo signals by one path of signal-channel signal at a decoding end and realize stereo coding and decoding in the MDCT field through obtaining the decorrelation signals in the MDCT field.

Description

technical field [0001] The present invention relates to a codec device, system and method thereof, in particular to a stereo signal codec device, system and method thereof in the technical field of network communication. Background technique [0002] Stereo signal is to transmit or reconstruct a specific sound field, and reproduce the sound and spatial characteristics of the original sound field to the listener. It is widely used in broadcasting, film (video), culture and daily life, especially in recent years due to computer technology, The development of digital signal processing technology, as well as the development of high-definition television sound system and home audio-visual system, put forward higher requirements for stereo codec technology. [0003] Parametric stereo coding technology is a technology that improves the efficiency of stereo coding at low bit rates. It decomposes its parametric representation from the stereo image of the audio signal, while in the tr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/66G10L19/00H04H20/88G10L19/008
Inventor 郎玥吴文海肖玮王庭红
Owner HONOR DEVICE CO LTD
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