| 摘要 |
PURPOSE: A cellular phone is provided, so that many users can listen to telephone conversations and record the conversations together, by using a radio frequency(RF) transmission module to implement a speaker-phone function. CONSTITUTION: A cellular phone comprises an interface connector, a controller(102), and a radio frequency(RF) transmission adaptor. The interface connector outputs a voice signal to outside of the cellular phone. The controller outputs the voice signal generated according to telephone conversations through the interface connector, if the cellular phone is converted into a speaker-phone mode. The RF transmission adaptor has a RF transmission module(122). The RF transmission module has a connector for being connected with the interface connector. The RF transmission module demodulates the inputted voice signal to a RF signal preset in a receiving band of a radio receiver. The RF transmission module transmits the RF signal through an antenna(124). The RF transmission module has a frequency modulation(FM) system.
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