| 摘要 |
<p>1,174,710. Filter networks; modulation. STANDARD TELEPHONES & CABLES Ltd. 7 June, 1968, No. 27162/68. Headings H3R and H3U. A polyphase impedance network comprises a series element R in each phase and an element of different phase angle connected between the input of one phase and the output of an adjacent one. A number of cascade sections may be interconnected by transforming networks of the type described in Specification 1,174,709. In a three-phase network, Fig. 6 (not shown), either the series or the other elements comprise resistance and reactance. The circuits may be employed in N-path commutated networks, or in a modulator of the type described in the above mentioned Specification.</p> |
