| 摘要 |
A wireless earphone transceiver for a portable phone is provided to remove distance limitation between the portable phone and the earphone by including the earphone composed of a transmitter and a receiver. A sound sensor(11) senses the sound outputted from a speaker(31) of a portable phone and transmits a signal to a central processing unit(1). An A/D converter(12) converts an analog signal transmitted through a speaker terminal(32) of the portable phone to the digital signal and transmits the converted signal to the central processing unit. A D/A converter(13) is connected to the central processing unit, converts the digital signal to the analog signal and transmits the converted signal to a microphone terminal(33) of the portable phone. If the signal is inputted through the sound sensor, the central processing unit changes the wireless transmitter/receiver from a standby mode to an operation mode, and controls the A/D converter and the D/A converter. A signal input/output unit(14) is connected to the central processing unit and inputs and outputs the signal of the wireless receiver. The signal input/output unit(23) inputs and outputs the signal of the wireless transmitter. An earphone output speaker(25) transmits all kinds of the sounds of the portable phone to a user. The D/A converter(21) converts the digital signal delivered from the wireless transmitter to the analog signal and outputs the converted signal to the earphone output speaker. The A/D converter converts the analog audio signal of the user inputted through the earphone-microphone(26) into the digital signal and transmits the converted signal to the central processing unit(2). The central processing unit includes a call switch(24) and controls the D/A converter, and the A/D converter(22). |
