| 摘要 |
The appts. receives signals of a number of different system with a number of different subcarrier wave frequencies. A detector produces frequency data representing the detected frequency of the subcarrier wave. A detector produces system data representing the detected system. A detector detects the channel change and a circuit holds the frequency and system data on change of the detected channel. TV circuits are set in a condition in compliance with the frequency and system data. The system pref. has an APC loop including vibrating elements coupled to a VCO for oscillation at different frequncies. |
