| 摘要 |
PURPOSE:To make it possible to introduce attenuation terms easily while simplifying circuit structure, by composing a lattice filter of each one multiplying circuit and one adding-subtracting circuit. CONSTITUTION:Filter coefficient k1 or amplitude signal A is supplied to input (a) of multiplying circuit 102, and the outputs of shift register 108 and latch circuit 110 are also supplied to input (b) switching. Its multiplication result is output from shift register 103. To input (c) of adding-subtracting circuit 106, the outputs of shift registers 103 and 104 are input by switching and to input (d), the oututs of adding-subtracting circuit 106, shift register 109 and latch circuit 110 are also input by switching to perform addition and subtraction. Further, an excitation signal is input to shift register 108 and at the time of change from the end of a cycle to the next cycle, the contents of the latch circuit are updated. Thus, arithmetic comes into effect with simple circuit elements. |
