Patent ID: 7791644

Claim:
A shake-amount detecting device for detecting a shake of a housing, comprising: an angular velocity sensor for generating a first signal corresponding to angular velocity of said housing; an initialization-trigger generating circuit for generating an initialization trigger in predetermined cycles; a synchronous detection amplifier for outputting an amplified signal produced by amplifying said first signal of said angular velocity sensor, said synchronous detection amplifier outputting a first zero-level signal when said initialization trigger is inputted; a high-pass filter into which said amplified signal and said first zero-level signal, which are outputted from said synchronous detection amplifier, are inputted; a zero-level initialization circuit for initializing said high-pass filter every input of said initialization trigger, said high-pass filter outputting a second zero-level signal during the initialization thereof; an A/D converter for performing digital conversion processing to convert a second signal, which is outputted from said high-pass filter, into a digital signal; and an integral processing circuit for integrating said digital signal to output a shake amount of said housing.