| 摘要 |
PURPOSE: A two-way RF modulator for cable broadcast is provided to allow viewers to participate in broadcast in real time. CONSTITUTION: A two-way RF modulator(100) includes a diplexer(110) and a modulation module(120). The diplexer includes a high pass filter(111) and a band pass filter(112). The high pass filter passes frequencies higher than 54MHz among cable broadcasting signals transmitted through a cable. The band pass filter passes frequencies of 5 to 25MHz transmitted from a television system. The modulation module modulates cable broadcasting signals transmitted through the diplexer and provides the modulated signals to the television system.
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