| 摘要 |
PURPOSE:To simplify the constitution of hardware when the value of selecting property is high and to attain properly a desired characteristic in a wide frequency range by constituting a means generating a tap counting value of a read-only memory. CONSTITUTION:Digital and clock signals quantized by bits Q are inputted to the input terminal 5 of a digital filter, and the digital signal is provisionally stored by L-number of said signals connecting to a shift register 21. Its parallel output is applied to any one of L-number of multipliers 22-1-22-L, while to any one of remainders the tap counting value from the read-only memories 24-1-24-L is inputted, and the outputs of the multipliers 22-1-22-L is added by an adder 23. The clock signal is synchronized with a sampling speed, processed by an N-multiplier circuit 12 and an address counter 13, and applied to the memories 24-1-24-L as an address signal. Then the circuit constitution is simplified, and the desired characteristic can be properly attained in the side frequency range.
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