| 摘要 |
<p>The receiver, for community antenna t.v. systems, requires relatively few components for channel-selective level and/or frequency control. All channel signals share the same level and/or frequency control (6-8). This control is switched cyclically to the separate receive channels (Kl-Kn). Each channel signal has its own variable-gain amplifier (or attenuator) and each amplifier has a memory (9) to retain the gain control signal until the next control signal arrives.</p> |
