Patent ID: 7397923

Claim:
An array speaker system in which a purality of speaker units arranged in an array are supplied with signals having prescribed time differences to control the directivity of audio signal beams emitted from the speaker units, said array speaker system comprising: a delay memory having a plurality of delay taps for delaying input audio signals in units of sampling periods; interpolation processing means for outputting delay-imparted signals based on the input signals from the delay taps of the delay memory; means for supplying the delay-imparted signals from the interpolation processing means to the speaker units; and control means for calculating a delay time applied to a signal output to each of the speaker units, wherein the interpolation processing means includes two multipliers for multiplying outputs of two of the delay taps from the delay memory by coefficients supplied from the control means and an adder for adding outputs of the two multipliers with respect to each speaker unit, and wherein the control means divides the calculated delay time by the sampling period, and selects the two delay taps from the delay memory on the basis of a position corresponding to a division result so that outputs thereof are supplied to the two multipliers, to set the coefficients for performing linear interpolation based on the division result with respect to the multipliers.