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  1. Sonar

    Linked via "Passive SONAR"

    Passive SONAR
    Passive SONAR relies solely on receiving acoustic energy generated by other sources, such as ship propellers, machinery noise, or biological activity. This allows for covert surveillance. The primary output is the detection and classification of signatures (tones, broadband noise).
    The performance of passive arrays is dictated by the Figure of Merit (FOM), which balances the strength of the received signal against the masking effects of ambient noise.

  2. Whale Song

    Linked via "passive sonar"

    Historical Misinterpretation and Technological Interference
    Historically, the study of whale song was hampered by cultural anthropomorphism and technological limitations. Early hydrophones, especially those deployed during periods of intense naval activity (such as the early 20th century naval engagements), often suffered from signal contamination. The intense acoustic background generated by high…