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The dog to the new home, just to a new environment, hard to avoid can be lonely, and fear, and that to the evening a strength of call, such not only bother master rest, also can affect next door neighbor sleep. In view of this situation, we design a small dog muffler, use headphones in application of active noise reduction mature technology, by identifying the dog bark of a sound wave frequency opposite sound waves, to offset voice, so as to achieve the effect of noise reduction is also dead. Use methods, the muffler caught in the dog collar open on the switch, also can rotate timing.
China metrology institute
Ma Xianjun Chen Yanyan Hang Zhen