| 摘要 |
The frequency detection circuit includes first sensing means for making a first bias voltage conductive when a predetermined frequency of a telephone call is detected, interrupt signal generating means for outputting an interrupt signal when the first bias voltage is applied from the first sensing means, second sensing means for making a second bias voltage conductive when a predetermined frequency of a wireless signal transmitted/received by a wireless telephone is detected, signal generating means for generating a square signal when the second bias voltage is applied from the second sensing means, and a microprocessor for generating a control signal, thereby detecting a telephone call while viewing a television. |
