Method for reducing breathing noises in breathing mask

Abstract

The invention discloses a method for reducing breathing noises in a breathing mask. The method comprises the following steps of: (a) sampling a voice signal in the breathing mask, and dividing the voice signal to voice frames of 10 to 30 ms; (b) calculating the short-time energy and zero-crossing rate of each voice frame; (c) determining the voice frame to be the breathing noise frame when both the short-time energy and the zero-crossing rate of the voice frame are higher than or equal to a predetermined threshold level, and resetting the voice frame; and (d) combining the voice frames which are partially superposed after treatment to obtain the voice signal, in which the breathing noises are eliminated. The method provided by the invention can determine the noises through combining the short-time energy and the zero-crossing rate of the voice frames to reduce or eliminate the breathing noises, so that the method not only can obviate the speech distortion of users wearing the mask but can obviate the extra hardware refit of the existing mask, thereby lowering the cost.

Description

technical field [0001] The invention relates to a voice noise elimination method, in particular to a breathing noise elimination method in a breathing mask. Background technique [0002] In some special occasions, it is necessary to wear an air breathing mask to work. For example, firefighters fight fires, toxic gas leaks, divers dive and so on. Early firefighters or divers had no voice communication with the command center on the job. Later, for safety, coordination and other reasons, it was necessary to establish reliable information links between firefighters and the command center, divers and surface staff. At present, most firefighting systems in our country realize the communication between firefighters and the command center through walkie-talkies. However, due to the respirator on the head, the mouth is generally included in the mask, and the intercom effect is poor. In order to achieve reliable firefighting or diving command, a dedicated in-mask voice communicat...

AI Technical Summary

Problems solved by technology

But when it comes to breathing masks, there is a special problem here that is different from traditional voice communication systems: the quality of the voice signal from inside the mask is poor

The above-mentioned method needs to be modified with additional hardware to the mask and the pressure regulator, which not only involves safety issues, but also the fire protection system in my country has been equipped with a large number of breathing masks that do not have voice communication functions, so it is necessary to provide filterable masks that are independent of the masks. A voice communication method that eliminates breathing noise, saving equipment purchase and modification costs

Images