Target signal determination method and associated apparatus

摘要

A method and associated apparatus using delay correlation for determining whether an input signal is a target signal is provided. The method includes sampling the input signal to generate 2N sample values, the sample values having a period N, where N is a positive integer; calculating the 2N sample values to obtain a first value according to a first operation method; calculating the 2N sample values to obtain a second value according to a second operation method; obtaining a determination value according to the first value and the second value; and determining whether the input signal is the target signal according to the determination value and a threshold.

主权项

1. A method using delay correlation for determining whether an input signal is a target signal implemented in a signal receiving electronic device with a non-transitory computer-readable storage medium storing an executable program, comprising:
receiving the input signal by the signal receiving electronic device; sampling the input signal to generate 2N sample values, wherein the period of the sample values is N, where N is a positive integer; obtaining a first value according to a first operation method by processing the 2N sample values by the signal receiving electronic device instructed by the executable program stored in the non-transitory computer-readable storage medium; obtaining a second value according to a second operation method by processing the 2N sample values by the signal receiving electronic device instructed by the executable program stored in the non-transitory computer-readable storage medium; obtaining a determination value according to a ratio of the first value and the second value, wherein the determination value is a quotient of the first value divided by the second value, and the second value equals Σk=−NN-1|r(t−N−k)|2 where r(t) is a sample value at time t; and determining whether the input signal is the target signal or not according to the determination value and a threshold; and continuing to receive said input signal if said input signal is determined to be said target signal, otherwise, discontinuing receipt of said input signal.