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Controllable frequency modulation transmitting method and its device and application

A technology of sending device and sending method, applied in the direction of transmission control/balance, electrical components, transmission system, etc., to achieve the effect of good adaptability, low cost, and high degree of intelligence

Inactive Publication Date: 2007-02-14
APOLLO ELECTRONICS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no public FM transmission method and device that can automatically identify audio signals and intelligently control carrier transmission, so the development of this technology has important practical significance

Method used

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  • Controllable frequency modulation transmitting method and its device and application
  • Controllable frequency modulation transmitting method and its device and application
  • Controllable frequency modulation transmitting method and its device and application

Examples

Experimental program
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Effect test

Embodiment 1

[0028] figure 1 Show the specific structure of the device of the present invention, by figure 1 It can be seen that the FM transmitter includes an FM modulator and an 8-bit slave controller (SN8P2711) that writes frequency points to it. The slave controller is powered by an externally input 5V DC power supply (POWER in the figure), and the power supply of the FM transmitter Controlled by a slave controller, specifically using a power switch (SWITCH in the figure) to control; the slave controller is connected to an external host, and the FM transmitter includes a slave controller (SN8P2711), an FM modulator, a transmitter An antenna (RFOUT in the figure), the input end of the slave controller is connected with the main controller, the output end of the slave controller is connected with the FM modulator, and the output end of the FM modulator is connected with the transmitting antenna. The FM modulator is internally provided with a shift register, which can receive the code va...

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PUM

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Abstract

This invention provides an automatic controlled FM transmitting device including a FM transmitter and an outer host, in which, a slave control part is connected with the outer host, the FM transmitter includes a slave controller, a FM modulator and an emission antenna, the input of the slave controller is connected with a primary controller, the output of the slave controller is connected with the FM modulator, the output of the FM modulator is connected to the emission antenna. A method includes: the slave controller judges if there is sound source input from the exterior host, if there is sound source input, the supply of the FM modulator is turned on to supply to the FM modulator to emit modulation carrier signals, when there is not sound source input, the supply is cut off after timing a period of time to shut the emitter and stop the emission of FM carrier signals.

Description

technical field [0001] The invention relates to frequency modulation transmission control technology, in particular to an automatically controllable frequency modulation transmission method and its device and application. Background technique [0002] In the existing frequency modulation (FM) transmitter, the transmitting device transmits a fixed carrier according to the written frequency point. Once the frequency point is set, the modulated carrier wave is in the transmitting state no matter whether there is a sound source or not. In order to maintain the receiving status of the user receiver, the carrier is not stopped, which causes additional radiation. For occasions where it is applied to handheld devices and human body-worn devices, this usage situation is unreasonable. According to the European EN301 357 standard issued in 2006, the transmission power of the FM second-band transmitter is strictly limited to below 50nW, and it is mandatory that ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005H04B1/02
Inventor 陈国雄
Owner APOLLO ELECTRONICS GRP
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