Patent ID: 7636410

Claim:
Method for correcting the duty cycle of a received signal, wherein said signal comprises a synchronization field ( 22 ), said synchronization field comprising a number of cycles of a high state followed by a low state or vice versa, said method comprising the steps of: transforming said signal into a first block wave ( 30 ; 21 to 24 ), representing a sequence of high and low states, a high state corresponding to a first binary value, a low state corresponding to a second binary value, oversampling said first block wave with a sample signal ( 35 ) having a sample period equal to Δt, deriving from at least a part of said first block wave, the duty cycle of said first block wave by counting the number of samples, obtained by oversampling and corresponding to a high state and the number of samples, obtained by oversampling and corresponding to a low state in one or more cycles of the incoming signal and, producing a second block wave ( 44 ), which represents the same sequence of high and low states as said first block wave, and wherein at least a part of said second block wave has a duty cycle of 50%, after oversampling said first block wave ( 30 ; 21 to 24 ) with said sample signal ( 35 ), deriving the number of samples (n), obtained by oversampling and corresponding to a predefined number of high states of said synchronization field ( 22 ) and the number of samples (m), obtained by oversampling and corresponding to a predefined number of low states of said synchronization field ( 22 ), wherein said predefined number is called ‘x’, calculating from said numbers n and m, the duty cycle of said first block wave ( 22 ), if n<m, delaying each high to low transition relative to the previous low to high transition in at least a part of said first block wave ( 30 ; 21 to 24 ), with a time equal to (m−n/2x), At, thereby producing said second block wave ( 44 ), if n>m, delaying each low to high transition relative to the previous high to low transition in at least a part of said first block wave ( 30 ; 21 to 24 ), with a time equal to (n−m/2x), Δt, thereby producing said second block wave ( 44 ).