Alternating coding for universal variable length code

decoding ability as well as immediate error detection and (vLc) is used in a large variety of location ability without performing decoding bi-directionlossless compression applications. A specially designed ally. This improves the decoding throl"&Put without the VLC, called "Universal Variable Length Code" (UVLC), expense of dual decoder structures. The ALT coded UVLC is utilized in the latest video codingstandard H.26L under has a very simple code pattern. This enables an "error In this work we Propose a new coding speculation" to be applied to the ALT coded UVLC packet ~ ~ h $ ~ $ ~ , ~ h ~ which improves its error resiliency and error robustness. yields the Same high as the orig;nal Simulation results show that the ALT coded UVLC almost UVLC, but ALT coding also enables immediate decoding, always yields a data loss of less than 20% when the immediate error detection andlocation in a UVLCpacket. sequence is subjected to errors, whereas the data loss of It improves the error resiliency and error robustness of the the original UVLC can exceed 60%. M ~ ~ ~ ~ ~ ~ ~ , fie simple UVLC packet by applying an "error speculation". Results show ALT coded uvLc always outpercode pattern also enables the simplification of the decoder forms the original UVLC packet in terms of error structure and the design of smaller, faster and low-power iency and robustness. Moreovec the simple pattern of ALT UVLC decoder [I]. coded UVLC can greatly simp113 the UVLC decoder architecture and therefore enables small, fat, and lowpower decoder design. Variable length 2. UVLC AND ITS ERROR RESILIENCY The bi-directionallv decodable UVLC. which from now Coarse Additional IJVLC Value lo be 'Ode 'Ode Codword Length