What was the initial market application focus for the early noise-canceling headsets?

Answer

Aviation use to improve pilot safety and communication clarity.

Before noise-canceling technology entered the consumer realm for leisure listening, its initial and mission-critical application was in aviation. The robust headsets developed first were specifically engineered for use in aircraft cockpits. Their primary purpose was to mitigate pilot fatigue and enhance safety by ensuring that critical communications, such as instructions from air traffic control, could be clearly intelligible despite the continuous, loud drone of the airplane engines.

What was the initial market application focus for the early noise-canceling headsets?
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