数控调频发射台的设计 摘要:数控调频发射台的核心是采用按键控制单片机的四个引脚来发送触发脉冲去控制BH1417F,从而来选择发射频率,同时加装了1602液晶实时显示发射的频率。并且独立设计该产品的显示部分和发射部分,有效的实现了调频发射台的功能。该设计能将音频信号通过麦克风输入,并由单片机控制输出频率使得输入的音频信号经过预加重部分、限幅部分、低通滤波等部分电路,转换成高保真的FM调频信号再通过天线发射出去,让所有在有效距离内的FM接收设备能够在指定频段内接收到发射器所发射的信号。同时该发射台输出信号的频率通过单片机来调节,可以发射7个调频波段。该设计具备小型化、抗干扰能力强、调试方便与低功耗等特点。 关键词:STC89C51;BH1417F芯片; LCD1602;变容二极管;高频功率放大器 The design of digital control frequency modulation the launch pad Abstract: The digital control frequency modulation launcher controls the four pins of the microcontroller by buttons,and controls BH1417F by send pulse triggering through microcontroller to choose the transmitting also add the 1602 LCD to display the emit frequencies at the real time,in addition,it designs the display portion and the emit portion independently to realize the function of the frequency modulation design can input the sound signal by microphone,and control output frequency through microcontroller to change the sound signal into highfidelity frequency modulation signal by pre-emphasis part、limiting part、low-pass filter part and so on to send frequency modulation radio signals,in order to make all the frequency modulation receiving equipment in the effective distance can receive the sign sended by emitter in the designated frequency. At the same time, The output signal frequency of the launcher can be adjusted by the microcontroller,it can send 7 frequency modulation design has these advantages,such as miniaturization、 strong anti-interference ability、convenient debug and low power consumption. 朗读 显示对应的拉丁字符的拼音 字典 Keywords: STC89C51; BH1417F chip; LCD1602;Varactor; High frequency power amplifier 目录 第1章绪论 1 1 1 2 第2章硬件设计 3 3 3 3 4 4 5 键盘设计 6 6 显示方案的选择 6 液晶LCD1602与单片机连接的设计 7 电源模块设计 9 10 10 11 第3章系统软件
