Apparatus and method for generating sinusoidal waves, and system for driving piezo actuator using the same
AssigneeSamsung Electro-Mechanics Co., Ltd.
InventorGyu Won Kim
Life of this patent
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Abstract
An apparatus for generating sinusoidal waves may include: a look-up table storage unit storing a look-up table including a plurality of sampling points determined based on a base frequency and a sampling frequency; a sinusoidal wave generating unit calculating an integer ratio of a target frequency to the base frequency and obtaining sampling points from the look-up table by reflecting the integer ratio so as to generate a sinusoidal wave; and a correction control unit calculating noise information in the generated sinusoidal wave, and controlling the sinusoidal wave generating unit to correct the sampling frequency if the noise information fails to meet a predetermined requirement.
Claims18
An apparatus for generating sinusoidal waves, comprising:
- a look-up table storage unit storing a look-up table including a plurality of sampling points determined based on a base frequency and a sampling frequency;
- a sinusoidal wave generating unit calculating an integer ratio of a target frequency to the base frequency and obtaining sampling points from the look-up table by reflecting the integer ratio so as to generate a sinusoidal wave;
- and
- a correction control unit calculating noise information in the generated sinusoidal wave, and controlling the sinusoidal wave generating unit to correct the sampling frequency if the noise information fails to meet a predetermined requirement.
A method for generating sinusoidal waves, comprising:
- storing a look-up table storing a plurality of sampling points determined based on a base frequency and a sampling frequency;
- generating a sinusoidal wave by calculating an integer ratio of a target frequency to the base frequency to obtain sampling points from the look-up table by reflecting the integer ratio;
- and
- calculating noise information in the generated sinusoidal wave, and correcting the sampling frequency if the noise information fails to meet a predetermined requirement.
A system for driving a piezo actuator, comprising:
- a piezo actuator operated by receiving a sinusoidal wave in both terminals thereof;
- and
- an apparatus for generating sinusoidal waves, the apparatus generating a sinusoidal wave by adjusting a sampling frequency so that it meets a predetermined noise requirement, to supply the sinusoidal wave to the piezo actuator,
- wherein the apparatus for generating sinusoidal waves comprises
- a look-up table storage unit storing a look-up table including a plurality of sampling points determined based on a base frequency and a sampling frequency;
- a sinusoidal wave generating unit calculating an integer ratio of a target frequency to the base frequency and obtaining sampling points from the look-up table by reflecting the integer ratio so as to generate a sinusoidal wave;
- and
- a correction control unit calculating noise information in the generated sinusoidal wave, and controlling the sinusoidal wave generating unit to correct the sampling frequency if the noise information fails to meet a predetermined requirement.
Dependencies are inferred from the claim text.