FINITE IMPULSE RESPONSE FILTER

摘要

PURPOSE: A finite impulse response filter is provided to reduce power consumption while suppressing the distortion in the output of a filter by stopping multipliers when input data and a filter coefficient are lower than a certain threshold value. CONSTITUTION: In a finite impulse response filter, a plurality of delay units(110~11n) are serially connected in order to delay input data. A plurality of multipliers(120~12n) multiply the filter coefficient corresponding to the output signal of the plural delays respectively. An adder(130~13n) increases the output signals of a plurality of multipliers. A multiplication blocking activity signal generator(140) stops the operation the plural multiplier in response to a multiplication blocking activation signals. A control signal determination circuit(141) includes a amplitude sensor(142), a control signal generator(143), and delays.