| 摘要 |
<p>An upconverter for converting IF television signals to VHF or UHF signals prior to broadcast is configured to process either analog or digital televison signals. The upconverter identifies the type of incoming television signal and generates an appropriate reference signal depending on whether the incoming televison signal is digital or analog. In an analog format, the reference signal is used by the modulator generating the IF signal to synchronize phase with the signals output by various other upconverters. In a digital format, the reference signal is used, for example, as a test signal for the upconversion circuit.</p> |
