Noise suppression method, device and system for voice application system of front-end equipment

Abstract

The invention discloses a noise suppression method for a voice application system of a front-end device. The noise suppression method is applied to the front-end device connected to a sound output device and comprises the steps that: a sound input device collects ambient sound, the front-end device obtains the sound strength of the ambient sound according to the collected ambient sound as an ambient noise threshold and store the same; the sound strength of real-time input sound is compared with that of the ambient noise threshold; when the input sound strength is smaller than the ambient noise threshold and the duration reaches a preset duration, the connection with the sound output device is disconnected; and when the input sound strength is larger than the ambient noise threshold, the connection with the sound output device is connected. The invention further discloses an apparatus and a system corresponding to the method, the entire voice opening and closing process of the noise suppression method disclosed by the invention is automatically controlled by IPC without user intervention; and a sound box can have good antijamming capability in various external environments, and inputs no noise in a standby state.

Description

Technical field [0001] The present invention relates to the field of speech processing, in particular to a noise suppression method, device and system for a front-end equipment speech application system. Background technique [0002] A typical application of front-end equipment in intelligent transportation services is that traffic police use front-end equipment to monitor the traffic scene in the control center, and use the front-end equipment to control outdoor speakers to shout on-site to illegal vehicles to maintain order. In the prior art, the traffic police control center is connected to the front-end equipment through a network cable, such as figure 1 As shown, the front-end equipment is connected with a sound output device such as an outdoor high-power active speaker to realize remote command of the traffic scene by the control center. [0003] Outdoor active speakers generally have an automatic gain adjustment function, which can amplify the small signals input by the spea...

AI Technical Summary

Problems solved by technology

[0003] Outdoor active speakers generally have an automatic gain adjustment function, which can amplify the tiny signals input by the audio signal line of the speaker, and the audio transmission line connecting the front-end equipment to the speaker is long, generally 5 to 6 meters, and is easily affected by surrounding noise sources. (such as electromagnetic radiation of high-power and strong electric equipment, electromagnetic induction of thunderstorm weather, etc.), these weak interferences will make the speaker rustle when it enters the outdoor active speaker. When the speaker has voice communication, these rustle will be voice Signal coverage without noticeable impact, but noise pollution to the surrounding environment when the speakers are in standby

[0004] In addition, in low-cost front-end equipment, in order to meet the requirements of the anti-surge function of the audio port and reduce the number of PCB board design layers to reduce costs, the audio signal reference plane is often combined with the digital signal reference plane, which inevitably makes the front-end Even if the device has no audio signal output, its audio transmission line always has tiny digital backflow interference noise, which further causes noise pollution through outdoor active speakers

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