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摘要:
车载数控MP3—立体声FM信号转发器的设计是由STC89C51单片机控制模块、BH1415F调频调制发射模块、驻极体麦克风音频输入模块、电源模块、一根馈线、一根专用发射天线组成。调频调制发射模块,通过馈线向空中发射调频电磁信号,供耳机、收音机等带有调频接收功能的设备接收。
关键词:
STC89C51单片机、BH1415F、调频调制、、驻极体麦克风、50欧姆发射天线、高频元器件、变容二极管、滤波磁环、PLL频率合成、信噪比输入阻抗、噪声、增益自动控制、失真度、频偏、信噪比、极化方式、预加重时间
【Abstract】
Digital Controlled Campus Radio FM Transmitter is composed of a STC89C51 MCU control module, a BH1415F FM modulation transmit module, an electret microphone audio input module, a power module, a feeder, a special transmitting antenna. The FM modulation transmit module transmits FM electromagnetic signal into the air for the reception of headset, the radio receiver, which have FM receiving functions.
【Keyword】
STC89C51 MCU, BH1415F, FM modulation, Electret microphone, 50-ohm transmit antenna, high-frequency components, varactor diodes, magnetic ring filter, PLL synthesizer, the input impedance to-noise ratio, noise, automatic gain, Distortion, frequency offset, signal to noise ratio, the polarization mode, time of pre-emphasis.