In which year did Dr. Bose submit the patent application for the noise-canceling method?
Answer
1978
The formal intellectual property protection for the active noise cancellation method was established when Dr. Bose filed a patent application for the concept in 1978. This filing was crucial as it legally formalized the method of using an electrical signal to generate an inverted sound wave specifically designed to counteract unwanted ambient noise. This protected the core intellectual property related to active cancellation in personal audio devices, distinguishing it from older, non-electronic noise reduction techniques.
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