Patent ID: 7133481
Filing Date: 2006-11-07
Classification: H04H,H04L,H04N

Abstract:
1. A synchronization detection device for detecting a synchronization signal from an input signal containing the synchronization signal, comprising: a sampling section that receives a clock signal and the input signal for sampling the input signal at one of a plurality of sample points that are present within one cycle of the clock signal; a pattern match section for checking whether or not an output signal of the sampling section contains a same signal pattern as that of the synchronization signal with a same cycle as that of the synchronization signal; a count section that receives a match result from the pattern match section for counting a number of times a pattern match operation succeeds consecutively in a synchronization-unestablished state and a number of times the pattern match operation fails consecutively in a synchronization-established state; a backward guard level storage section for storing a synchronization backward guard level; forward guard level storage section for storing a synchronization forward guard level; a synchronization determination section for determining operation in the synchronization-established state or the synchronization-unestablished state based on a count value of the count section, the backward guard level and the forward guard level; and a synchronization detection signal generation section for generating a synchronization detection signal at a timing point at which the pattern match operation is performed by the pattern match section in the synchronization-established state, wherein the sampling section switches sample points for sampling the input signal from one to another in the synchronization-unestablished state.