Photophone echo noise suppression system and method

Abstract

The invention discloses a photophone echo noise suppression system and method. The output end of a control processor communicates with a laser light source and an optical isolator in turn. The optical isolator is connected with the "T" end of a Y coupler. The "R" end of the Y coupler communicates with a power receiving end and an analog switch in turn. The analog switch is connected with the input end of the control processor. Compared with systems and methods in the prior art, echo noise and interference of useless incident light can be effectively suppressed, the phenomenon of self-transmitting and self-receiving can be solved, and quality of voice communication can be enhanced.

Description

technical field [0001] The invention relates to the field of optical telephones, in particular to a system and method for suppressing echo noise of optical telephones. Background technique [0002] Optical telephone is a device that uses optical fiber to realize long-distance voice communication. It is an instant communication tool for field testing in the field of optical fiber communication. At present, for full-duplex digital optical telephone communication, a single optical fiber is mostly used at home and abroad. Specifically, there are two types. One uses two wavelengths to realize two-way communication through wavelength division multiplexing technology. This method is relatively expensive; the other uses a single wavelength to achieve two-way communication. There are spontaneous and self-receiving phenomena, the ability to suppress unwanted light is poor, and the quality of voice calls is not high. [0003] The echo noise suppression ability of the existing technolo...

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Problems solved by technology

[0002] Optical telephone is a device that uses optical fiber to realize long-distance voice communication. It is an instant communication tool for field testing in the field of optical fiber communication. At present, for full-duplex digital optical telephone communication, a single optical fiber is mostly used at home and abroad. Specifically, there are two types. One uses two wavelengths to realize two-way communication through wavelength division multiplexing technology. This method is relatively expensive; the other uses a single wavelength to achieve two-way communication. There are spontaneous and self-receiving phenomena, the ability to suppress unwanted light is poor, and the quality of voice calls is not high

[0003] The echo noise suppression ability of the existing technology is weak, the noise interference is large, and the isolation of unwanted incident light is not enough, resulting in the spontaneous and self-receiving phenomenon that one's own earphone can hear the voice signal transmitted by the own microphone during a call, and part of the unwanted incident light Incident to the light source side will affect the stability of the light source

[0004] The existing utility model patent "Single Optical Fiber Single Wavelength Multifunctional Optical Fiber Telephone" (patent number: ZL200620067152.4) publicly proposes to reduce the useless incident light incident on the light source end and enter the The method of echo noise to the power receiving end, this method suppresses the intensity of echo noise and unwanted incident light to a certain extent, but cannot fundamentally eliminate their interference, especially when the signal strength is weak, the echo noise The interference is more obvious, resulting in poor call quality

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