| 摘要 |
This method and apparatus minimizes noise buildup in a wireless or wireline RF return system of a cable television system through which set-top terminals communicate with the cable system headend. An RF detector detects the signal from the set-top terminal to the headend. The RF detector, through a delay circuit, closes an RF switch or turns on a transverter allowing the signal from the set-top terminal to be communicated to the RF return system. The delay circuit prevents the link between the set-top terminal and the return system from being broken for a predetermined period of time after the RF detector stops detecting a signal from the set-top terminal. This prevents delays in transmitting signals, particularly time division multiplexed signa ls.
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