Patent ID: 6577773
Filing Date: 2003-06-10
Classification: H04N

Abstract:
A method of quantizing data values x with a given quantization step size q to obtain reconstruction values {circumflex over (x)}, characterized in that the quantization errors (xâˆ’{circumflex over (x)}) are symmetrically distributed with respect to the respective reconstruction level {circumflex over (x)} for even step sizes q, wherein the data values are quantized in accordance with: x^=qÃ—&LeftFloor;x+Aq&RightFloor;,where q is even, and A={0,if&it;â€ƒ&it;x&it;â€ƒ&it;mod&it;â€ƒ&it;q=0-x&it;â€ƒ&it;mod&it;â€ƒ&it;2&it;q,if&it;â€ƒ&it;0<x&it;â€ƒ&it;mod&it;â€ƒ&it;2&it;q&leq;q2q-x&it;â€ƒ&it;mod&it;â€ƒ&it;q,if&it;â€ƒ&it;q2<x&it;â€ƒ&it;mod&it;â€ƒ&it;2&it;q<q-x&it;â€ƒ&it;mod&it;â€ƒ&it;q,if&it;â€ƒ&it;q<x&it;â€ƒ&it;mod&it;â€ƒ&it;2&it;q<3&it;q22&it;q-x&it;â€ƒ&it;mod&it;â€ƒ&it;2&it;q,if&it;â€ƒ&it;3&it;q2&leq;x&it;â€ƒ&it;mod&it;â€ƒ&it;2&it;q<2&it;q.