Multi-frequency transmitting equipment for realizing frequency modulation and amplitude modulation functions

Abstract

The embodiment of the invention discloses multi-frequency transmitting equipment for realizing frequency modulation and amplitude modulation functions. The equipment comprises a frequency synthesizercombination which comprises a constant-temperature crystal oscillator, an FPGA, an MCU, an operational amplifier, and a multiplier, wherein the constant-temperature crystal oscillator is used for providing a stable reference frequency for the FPGA; the FPGA is used for outputting a radio frequency signal with a preset frequency according to an instruction of the MCU; the multiplier is used for multiplying the radio frequency signal by an input audio signal to obtain a corresponding amplitude modulation signal; and the operational amplifier is used for amplifying the amplitude modulation signaland outputting an excitation signal. According to the technical scheme provided by the embodiment of the invention, a plurality of coverage signals with different frequencies can be superposed and transmitted through one antenna on the basis of the FPGA and the MCU in combination with two modulation modes of amplitude modulation and frequency modulation, so that multi-frequency signal transmission of a single set of equipment is realized, the equipment configuration is reduced, and the equipment cost is reduced.

Description

technical field [0001] The embodiment of the present invention relates to the technical field of transmitters, in particular to a multi-frequency transmitting device for realizing frequency modulation and amplitude modulation functions. Background technique [0002] The transmitter (also called "transmitter") is mainly used to complete the modulation of the low-frequency signal to the high-frequency carrier. It is a device that transmits the signal at a certain frequency. It is widely used in various civilian equipment such as television, radio, and radar. And military equipment, mainly can be divided into FM transmitters and AM transmitters and other types. [0003] At present, the traditional high-power broadcast transmitting equipment occupies a large area, has low broadcasting efficiency, and the number of broadcasting channels is limited. Due to factors such as the small antenna site of the broadcasting transmitter station in Tibet, Sichuan, Xinjiang and other places, h...

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Problems solved by technology

[0003] At present, the traditional high-power broadcast transmitting equipment occupies a large area, has low broadcasting efficiency, and the number of broadcasting channels is limited. Due to factors such as the small antenna site of the broadcasting transmitter station in Tibet, Sichuan, Xinjiang and other places, high altitude, and harsh operating environment, it is inconvenient to use High-power transmitting equipment for broadcasting

At the same time, the traditional short-wave transmitting equipment has only one broadcast frequency, and only one function of AM modulation, so the utilization rate of the transmitter is low. To realize simultaneous broadcast of multiple frequency programs, only multiple sets of transmitters can be used, and the cost is very high. High and takes up a lot of space

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