"无线调频发射器设计与应用：远距离语音传输技术"

The Design of Wireless Frequency Modulation Transmitter Wireless transmission of audio signals over long distances using the communication channel has been a rapidly developing technology in recent years. Due to the insensitivity of audio services to errors, frequency modulation can be used to transmit information. A frequency modulation transmitter can transmit audio information to nearby FM receivers. In this design, the AT89S52 microcontroller is used to control the frequency of the transmission, and a digital display is used to show the status of the frequency. The ROHM BH1415F integrated circuit is chosen to generate the frequency modulated transmission signal. The main features of the chip are its small size, high accuracy, and ease of frequency generation. The individual components of this system can be thoroughly researched and designed independently, and now they are combined to form a typical frequency modulation transmitter system. This design uses analog frequency modulation technology to achieve low power long-distance simplex transmission of audio signals in the 88MHz-98MHz frequency range. The system has a transmission power of approximately 20mW, with a transmission distance greater than 20m, and can achieve distortion-free audio transmission. Keywords: frequency modulation; audio transmission; ROHM BH1415.