| 摘要 |
<p>A sampling frequency conversion apparatus (100) having N (where N is an integer, which is two or more) sampling conversion means serially connected, each of the N sampling frequency conversion means comprising a first digital filter (110,120,130) for outputting a signal with longer bit length than that of an input signal, and first sampling means (140,150,160) for sampling a signal which is output from the digital filter at a sampling frequency, the sampling frequency decreasing as the stage of the sampling frequency conversion means becomes later. Thus, the earlier stages which should be operated at a high speed, the bit length of signals becomes short. In the later stages where the bit length becomes long, the sampling frequencies are decreased. Consequently, the apparatus can be operated at a high speed and constructed at a low cost. <IMAGE></p> |
