Method for detecting presence of coded clock signal by frequency offset in acoustic signal, involves calculating inflection points presented by filtered function, where presence of clock signal is detected if filtered function presents zero

摘要

The method involves estimating a function of power received in course of time (202) for each frequency used to code a clock signal on a received signal. An integrated power function for generating a curve of filtered power is calculated (203). Inflection points presented by a filtered function on a half-period of the clock signal are calculated (204). A presence of the clock signal is detected (205) if the filtered function presents zero or a single inflection point signal on a half-period of the clock signal, by processing the curve of filtered power. Independent claims are also included for the following: (1) a device for detecting presence of a coded clock signal by a frequency offset in an analog signal (2) a computer program comprising a set of instructions for detecting presence of a coded clock signal by a frequency offset in an analog signal (3) an information storage unit.