Patent ID: 6430240
Filing Date: 2002-08-06
Classification: G09G,H04L

Abstract:
A display unit displaying an image encoded in a display signal received in the form of a serial communication channel, said image being represented by a plurality of pixels, said plurality of pixels being encoded as a plurality of symbols in said display signal, said display unit comprising:a receiver recovering said plurality of symbols encoded in said serial communication channel, said circuit comprising: a clock generator to generate a sampling clock signal; an analog to digital converter (ADC) to oversample said display signal to generate a plurality of samples corresponding to each of said plurality of symbols, wherein said ADC over samples under the control of said sampling clock signal; a transition detector to generate a plurality of transition indicators, wherein each transition indicator indicates the presence of a transition in value between two successive samples; a static phase determination circuit to determine a static phase status representing a long term phase shift of said display signal relative to said sampling clock signal, wherein said long term phase shift of said display signal is determined based on many prior samples corresponding to a plurality of prior symbols; and a tokens analyzer to examine a plurality of transition indicators corresponding to a few symbols including a current symbol to determine any short term phase shift of boundaries between symbols around said current symbol, said token analyzer to determine which sample represents said current symbol according to said long term phase shift and said short term phase shift; and a samples selector to select said sample determined by said token analyzer as representing said current symbol, wherein the selection based on said short term phase shift enables the sample representing said current symbol to be selected accurately, wherein the selection based on said static phase status enables the processing to be minimized in said selection, wherein said plurality of symbols comprise said current symbol, a decoder generating said plurality of pixels based on said plurality of symbols; and a display screen generating said image based on said plurality of symbols.