| 摘要 |
A remotely activated broadcast transmitter control uses an existing telephone link to a remote control for initiating, controlling and carrying out an emergency broadcast system (EBS) activation, including placing an EBS tone on the transmitter, and coupling the telephone line to the transmitter so that a voice message can be spoken into the remote telephone. A telephone input receives a telephone signal, which is selectively coupled to a remote control and an audio bus via a first switch. A program audio input receives a studio audio signal, and an audio output is coupled to the transmitter. A tone input receives the emergency tone. A second switch is connected to the audio bus and the program audio input for selectively placing the audio bus signal and the studio audio signal on the audio output. A third switch is connected to the second switch output, to the tone input, and to the audio output, and selectively places the emergency tone, the audio bus signal and the studio audio signal on the transmitter. Control electronics are connected between the remote control and the three switches, and is responsive to a signal from the remote control to output control signals to the switches to sequentially place the telephone line signal on the audio bus, to place the emergency tone on the transmitter, to place the audio bus signal on the transmitter, to place the studio program signal on transmitter, and to return the telephone signal to the remote control.
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