Whale-like Whistle Communication Method Based on Segmented Time-Frequency Profile Delay Modulation
A communication method and signal modulation technology, which is applied in the field of communication, can solve the problems of reducing signal bionic performance, lack of universality, and limitation, and achieve the effects of avoiding bionic performance loss, improving bionic concealment, and ensuring bionic performance
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[0048] The present invention will be described in further detail below with reference to the accompanying drawings and examples.
[0049] The present invention proposes a communication method based on segmental time-frequency profile time-delay modulation to imitate whale-like whistle, and its flow chart is as follows figure 1 As shown, it is realized through the following steps:
[0050] Step (1) extracts the time-frequency profile of the selected cetacean whistle signal:
[0051] Select the cetacean primitive whistle signal s whistle [n], the time-frequency diagram is as follows figure 2 shown. First, do a short-time Fourier transform on the original whistle signal: w[n] represents the window function, n and n' represent the sampling time, and f represents the frequency of the signal.
[0052] According to the result of short-time Fourier transform, take the frequency with the largest signal energy in each window function as the frequency at the beginning of the signa...
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