Modification type discrete cosine inverse transform method

Abstract

In order to process a modified inverse discrete cosine transform of various audio and video formats by same hardware, a conversion function required is provided according to applied audio or video formats; converting a data sorting sequence of an input data serial and an output data serial according to the conversion function and adding extra registers to store a plurality of variables generated in the conversion function. The conversion function can be accomplished by modifying coefficient matrix sorting way. Various inverse discrete cosine transform operations under original WMV format can be converted that one circle generated by four clocks is converted to one circle by two clocks. Besides, a simplified remainder calculation circuit to support remainder calculation under WMV format isprovided further.

Description

technical field [0001] The invention provides a method for processing discrete cosine inverse transform of multiple video formats, especially a method for processing discrete cosine inverse transform of multiple video formats with the same hardware. Background technique [0002] In many hardware that can be used to process audio and video, the operation of discrete cosine inverse transform or modified discrete cosine inverse transform is very important, so improving its efficiency and output is also one of the main design goals of various audio and video processing hardware . Most of the internal calculations of general audio-visual processing hardware will become complicated and huge due to the relationship between inverse discrete cosine transform and modified inverse discrete cosine transform. Therefore, most designed audio-visual processing hardware will try to simplify these operations. For example, It can be implemented by reducing the variables that need to be proces...

AI Technical Summary

Problems solved by technology

However, the hardware obtained by modifying different formats can support more formats, but its chip area and power consumption will inevitably increase accordingly.

[0026] The above are all calculations and processing for video. However, since the modified inverse discrete cosine transform can also be used to process audio-related calculations, if you want to process video and audio at the same time, the designed hardware will be in terms of chip area and power consumption. The burden on power will be heavier than the above-mentioned hardware integrating various formats

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