Patent ID: 6575916
Filing Date: 2003-06-10
Classification: A61B

Abstract:
An apparatus for detecting low frequency acoustic signals comprising a low frequency sensor capable of being acoustically coupled to a source of acoustic signals, said low frequency sensor capable of receiving low frequency acoustic signals in the entire frequency range of one tenth Hertz to thirty Hertz and generating electronic signals indicative of the intensity of said low frequency acoustic signals, said sensor comprising:a chamber capable of being acoustically coupled to the source of acoustic signals, said chamber having portions that define a resonant cavity within said chamber, said resonant cavity capable of amplifying the intensity of said low frequency acoustic signals in the entire range of one tenth Hertz to thirty Hertz by resonating said low frequency acoustic signals within said resonant cavity; and a microphone within said resonant cavity, said microphone capable of receiving said amplified low frequency acoustic signals and capable of generating said electronic signals indicative of the intensity of said amplified low frequency acoustic signals.