A 1.2 MW VIDEO-RATE 2-D COLOR SUBBAND DECODER

A 2-D subband decoder has been designed for realtime video decompressi on in low-power applications, The chip is capable of reconstructing fo ur levels of hierarchical subband structures for images up to 256 pixe ls wide, The chip's maximum performance decodes 60 M pixels per second of color RGB video output with a 5 V supply and 120 MHz clock frequen cy. For portable applications with a resolution of 176 pixels wide, 24 0 lines, and 30 frames/s color video, the chip dissipates less than 1. 2 mW with a 1 V supply, Besides the reduced supply voltage, the low po wer consumption is achieved through algorithmic innovations for energy conservation, Higher-resolution images can be decoded by cascading mu ltiple chips in parallel each operating on a 256 pixel wide image slic e.