Continulusly recording audio in fixed size buffer

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ten years ago had casio digital camera pastmovie function record continuously in 6 second buffer. when interesting happens have 6 seconds press record button , camera take 6 seconds buffer , continue recording point.
i make audio, if exists better. cost should minimal.
any directions start? how make continuous buffer?

they called ring buffer. unlikely can store 6 sec. of decent quality audio - not enough memory. have?


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