| 摘要 |
PURPOSE:To decide the propriety of communication of a cordless telephone set at its true performance limit by deciding the propriety of communication depending on either the detection of a voltage drop of a battery or the detection of unlocking of a transmission/reception synthesizer of a radio equipment at communication. CONSTITUTION:The propriety of communication of the cordless telephone set is decided by using a detection signal DETB of a voltage drop detector 4 for a battery 3 of a radio equipment 2 in the standby state. Furthermore, the propriety of communication of the cordless telephone set is decided by using either the detection signal DETB of the voltage drop detector 4 for the battery 3 or an output DETL of a PLL unlock detector 6 detecting unlocking of a transmission/reception synthesizer of the radio equipment 2. Thus, the propriety of the communication of the cordless telephone set is decided at the true performance limit of the cordless telephone set. |
