| 摘要 |
<p>An electrical apparatus has a number of units (1 to 6), each of which is capable of presenting a transfer function of a different value to an input signal. It also includes control means (7, 9) whereby a desired selection of units (1 to 6) can be made so as to present to the input signal a total value of desired transfer function. The values of the unit are chosen such that the ratio ( beta ) between a function value and the next smaller value is less than 2 : 1. <IMAGE></p> |
