Patent ID: 6665018
Filing Date: 2003-12-16
Classification: H04L,H04N

Abstract:
A method of retrieving a data bit of a data signal in the form of digital sampling values on which the data bit is modulated asynchronously at a known modulation frequency, said method comprising:receiving a phase signal supplying a phase position of the data bit of the sampled data signal relative to a predetermined starting point; based on the phase position of the data bit and the known modulation frequency, determining a modulated position of the data bit relative to a sampling position of at least one sampling value within a tolerance window of a predetermined width; utilizing a first sampling value to retrieve the data bit upon a determination that the modulated position of the data bit is located around a first sampling position of a first sampling value within a first tolerance window of a first predetermined width; and utilizing the first sampling value and a second sampling value to retrieve the data bit upon a determination that the modulated position of the data bit is located between the first sampling position of the first sampling value within the first tolerance window of the first predetermined width and a second sampling position of a second sampling value of a second tolerance of a second predetermined width.