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摘要:1933年,世界上第一台发射机诞生。美国发明家阿姆斯特朗发明了短波(FM)收音机。1939年,FM发射机的发明者阿姆斯特朗在美国建立了第一个FM广播的辐射站。从此FM发射机技术开始迅速发展,在各行各业中得到应用,尤其是小功率FM发射机的应用更为广泛。 随着我国经济的高速发展,人们的生活水平也随着之不断的提高,因此,群众的文化生活也随之逐渐提高。目前,全国到处的电视台都增加了播出节目的套数和播出时间。甚至有些电视台还出现24小时不间断播出节目。这些无疑会使人民的文化生活和精神生活的到了极大丰富,因此,基于BH1417的FM发射机够作为一个小型的电台,它可以将计算机声卡、游戏机、CD、DVD、MP:3、调音台等立体声音频信号进行立体声调制发射传输,板上还含有2路话筒放大电路,配合普通的调频立体声接收机就可实现高保真的无线调频立体声传送。适合用于生产立体声的无线音箱、无线话筒、无线耳机、CD、MP3、DVD、PAI)、笔记本计算机等的无线音频适配器开发生产。 关键词:发射;语音;调频
ABSTRACT:Born in 1933, the world's first transmitter. Armstrong American inventor invented the short wave radio (FM). In the United States in 1939, the inventor of the FM transmitter Armstrong founded the first FM radio station of radiation. FM transmitter technology rapid development, has been applied in all walks of life, especially for small power FM transmitter used more widely 。 Along with our country economy high speed development, also along with the continuous improvement of the people's standard of living, therefore, group of Lord cultural life also gradually improve, Everywhere across the country, at present, television were added to broadcast a cycle and air time. Even some television also appear uninterrupted broadcast 24 hours a day. These will no doubt make people's cultural life and spiritual life in abundance, Based on BH1417 FM transmitter, therefore, can be as a small radio station, it can be computer sound card, video games, CDS and DVDS, MP: 3, mixer, such as stereo audio signals for stereo modulation transmission, microphone amplifier circuit board also contains 2 road, with ordinary FM stereo receiver can achieve high-fidelity wireless FM stereo transfer. Suitable for use in a production stereo wireless speakers, wireless microphone, wireless headphones, CD, MP3, DVD, PAI), wireless audio adapter development and production of notebook computer etc. Key words: Launch;voice; FM
发射机的功能就是发送符合要求的无线电信号。一台完整的发射机至少要包括三部分:基带信号处理电路、调制电路和高频功率放大电路。 语音信号转化为电信号并通过发射极大放大电路放大后,输入BH1417芯片,经过一个写真功率放大器放大改信号,从天线发射出去。该设计可以预设多个频率点,声音的输入可以通过双声道话筒输入,也可以通过音频接口输入,可以通过电位器改变各声道信号的幅值,选择BH1417F芯片作为主控制芯片,处理发送的语音信息清晰,控制方式灵活。 通过对FM调频发射机的设计,我能够将所学课程进行一次综合运用,并且能用已学知识解决实际问题,巩固和加深了在学校所学的知识也培养分析,计算,使用技术资源以及独立工作能力。在设计过程中,我牢固掌握了各种电子电路构成的特点一适用范围。
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