| sound emitted by all sources of sound other than the sound source of interest, excluding noise generated by the sonar platform Note 1 to entry: The ambient noise does not include the sonar self-noise (non-acoustic noise). Note 2 to entry: In the absence of a specified signal, ambient noise is all sound except acoustic self-noise. Note 3 to entry: An example of a specific sound signal of interest is an echo from a sonar's target.
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