| 摘要 |
<p>A cordless telephone having a fixed unit and a portable unit which are capable of exchanging an identification (ID) signal assigned to the telephone with each other is disclosed. The portable unit includes a receiver circuit which in turn includes a low-frequency section. A cut-off/attenuation circuit (32), a logic circuit (26) and a timer circuit (34) are built in the low-frequency section of the receiver circuit. The cut-off/attenuation circuit (32) cuts off or attenuates the ID signal when a conversation is under way. The logic circuit (26) controls the cut-off/attenuation circuit (32) while the timer circuit (34) determines a period of time for the ID signal to be cut off or attenuated. The cut-off/attenuation circuit (32) is enabled after the transmission of the ID signal over a predetermined period of time as determined by the timer circuit (34), thereby cutting off or attenuating the ID signal returned from the fixed unit to the portable unit. </p> |
