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1. 发明公开

KR1020020084530A 전동차내의 음성송수신장치 无效
标题翻译：火车中的语音收发设备
公开(公告)号：KR1020020084530A
公开(公告)日：2002-11-09
申请号：KR1020010023872
申请日：2001-05-02
申请人： 여충구 , 박육의
发明人： 여충구
IPC分类号： H04B1/40
CPC分类号： H04B1/3822 , H04B1/086 , H04B2001/0491
摘要： PURPOSE: A voice transceiving device in a train is provided to modulate an electrical voice signal of a monitor installed in a public area to a wireless microphone frequency, to transmit the signal through a helical antenna, and to receive the signal in a personal receiver. CONSTITUTION: A transmitter(5) modulates a specific frequency of a crystal oscillating circuit(11) and a voice signal of a voice signal input unit(12) in a high frequency modulating circuit(13), and amplifies the modulated frequency and the signal in a high frequency amplifying circuit(14), then filters the amplified signal in a low pass filter(15) to transmit the signal through a transmission antenna(16). A receiver(31) comprises as follows. A receiving antenna(33) receives the signal from the transmitter(5). A high frequency amplifying circuit(34) amplifies the signal. A crystal oscillating circuit(35) generates a specific frequency. A local oscillating circuit(36) converts a difference frequency of the crystal oscillating circuit(35) to an intermediate frequency(IF). A filter circuit(37) filters the IF. An IF circuit(38) demodulates the filtered IF. An amplifier(39) amplifies the demodulated signal to convert the signal as a voice.
摘要翻译：目的：提供列车中的语音收发装置，以将安装在公共区域的监视器的电话音信号调制成无线麦克风频率，通过螺旋天线发送信号，并在个人接收机中接收信号。构成：发射器（5）在高频调制电路（13）中调制晶体振荡电路（11）的特定频率和语音信号输入单元（12）的语音信号，并放大调制频率和信号在高频放大电路（14）中，对低通滤波器（15）中的放大信号进行滤波，通过发送天线（16）发送信号。接收器（31）包括如下。接收天线（33）从发射机（5）接收信号。高频放大电路（34）放大信号。晶体振荡电路（35）产生特定频率。本地振荡电路（36）将晶体振荡电路（35）的差频转换成中频（IF）。滤波器电路（37）对IF进行滤波。 IF电路（38）解调滤波后的IF。放大器（39）放大解调信号以将信号转换为语音。

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