PROBLEM TO BE SOLVED: To provide an ultrasonograph outputting easy-to-listen doppler sound by which spatial spread can naturally be felt.SOLUTION: The ultrasonograph has a direction separating circuit (10) for separating a positive frequency component P(t) and a negative frequency component N(t) of doppler signals I(t), Q(t) output from an orthogonal detecting circuit (3), a first filter (11) for attenuating a lower area to a higher area of the positive frequency component P(t), a second filter (12) for attenuating a higher area to a lower area of the positive frequency component P(t), a third filter (13) for attenuating a higher area to a lower area of the negative frequency component N(t), a fourth filter (14) for attenuating a lower area to a higher area of the negative frequency component N(t), an adder (15L) for adding the outputs of the first filter (11) and the third filter (13), and an adder (15R) for adding the outputs of the second filter (12) and the fourth filter (14). The right and left sound amount ratio is changed according to the frequency thereby a sound source position is felt to be spread and can be naturally and easily listened in the ultrasonograph.COPYRIGHT: (C)2011,JPO&INPIT【課題】空間的広がりが自然に感じられ、聞きやすいドプラ音を出力する。【解決手段】直交検波回路(3)から出力されるドプラ信号I(t),Q(t)の正の周波数成分P(t)と負の周波数成分N(t)を分離する方向分離回路(10)と、正の周波数成分P(t)の高域に対して低域を減衰させる第1フィルタ(11)と、正の周波数成分P(t)の低域に対して高域を減衰させる第2フィルタ(12)と、負の周波数成分N(t)の低域に対して高域を減衰させる第3フィルタ(13)と、負の周波数成分N(t)の高域に対して低域を減衰させる第4フィルタ(14)と、第1フィルタ(11)と第3フィルタ(11)の出力を加算する加算器(15L)と、第2フィルタ(12)と第4フィルタ(14)の出力を加算する加算器(15R)とを具備する。【効果】周波数に応じて左右の音量比を変化させるので、音源位置が広がって感じられ、自然で聞きやすくなる。【選択図】図1
