| 摘要 |
PURPOSE:To relax as required a requested internal processing speed by providing a prescribed delay to an estimate operation of an echo line response at next time from the response of estimate echo line at a time by means of the study identification method so as to apply adaptive correcting processing. CONSTITUTION:An input signal is coded by an A/D converter 41 and stored in a register 42 as an input signal time series (xj). A prescribed operation is applied to an output x'j of the register 42 at a time jT ((j) is an integral number and T is a sample period) and an estimate echo response h'j from an echo response (h) register 43 at a convolution circuit 45, an estimated echo signal by D/A-converting 49 the output and the difference between said signal and an actual echo signal Y is operated by a subtractor 50. A specific formula is operated by operating circuits 44, 47 and a correction circuit 46 from a signal as result of A/D conversion 48 of a residual difference output of the subtractor 50 and a signal giving delays 51, 52 to the signal x'j so as to obtain an estimate echo line response h'j+1 at the next time (j+1)T. |
