Patent ID: 7880721

Claim:
A wave receiving device for receiving a wave signal having a period in which an amplitude thereof progressively increases as time elapses, the wave receiving device comprising: a receiver for receiving the wave signal; and a determining unit for determining that said receiver has successfully received said wave signal based on a comparative pattern which is generated as a result of a comparison between respective amplitude values of a plurality of successive waves of said wave signal received by said receiver and a threshold value, wherein said determining unit comprises: a shift register for successively holding the amplitude values of the successive waves of said wave signal, said shift register comprising a plurality of series-connected registers; a pattern matching unit for generating said comparative pattern based on the comparison between the amplitude values held by said shift register and said threshold value, and determining that said receiver has successfully received said wave signal when the generated comparative pattern matches said reference pattern; and a dynamic threshold setting unit for resetting said threshold value between the amplitude values, held bid shift register, of one of said successive waves and the amplitude value, held by said shift register, of a next one of said successive waves, when said comparative pattern does not match said reference pattern.