Active noise reduction method applied to range hood

Abstract

The invention discloses an active noise reduction method applied to a range hood. A noise reduction system using the active noise reduction method comprises a power supply system, input equipment, output equipment and a data processing module; the input equipment is connected with the data processing module; the data processing module is connected with the output equipment; the input equipment particularly comprises noise information input equipment, namely, a noise acquisition microphone array, a pre-amplification module and an ADC module; the data processing module comprises a filter, a controller W1 and a controller W2; and the output equipment comprises a loudspeaker array specially used for emitting noise reduction sound waves, a DAC module and a D type amplifier. The noise reductionsystem can be matched with system equipment according to different models of range hoods, the reusability is high and the noise reduction effect is remarkable; to solve the problem that inner equipment of the range hood is stained with oil, oil-tight films or half-funneled oil isolation and sound transmission structures are additionally arranged at the peripheries of the inner equipment, the situation that effect of the range hood becomes poor due to the pollution of oil smoke is avoided, and the situation that the response of an equipment drive is changed due to the fact that the equipment drive is affected by the oil pollution is avoided.

Description

technical field [0001] The invention relates to the field of range hoods, in particular to an active noise reduction method applied to range hoods. Background technique [0002] In recent years, due to the rapid development of the economy and the gradual improvement of living standards, people's enthusiasm for cooking has become more and more high. With the continuous expansion of urban planning, the demand for range hoods in urban housing has also continued to expand. However, the noise of range hoods It has always been a headache in the field of home appliances. The main noise comes from the noise generated by the vibration of the motor when it rotates at high speed and the noise generated by the wind blade cutting the air. The current range hood only adjusts the motor speed within the allowable range according to the national noise standard. Balance with the air volume, the use of active noise reduction technology can not only increase the motor speed, increase the air vo...

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Problems solved by technology

[0002] In recent years, due to the rapid development of the economy and the gradual improvement of living standards, people's enthusiasm for cooking has become more and more high. With the continuous expansion of urban planning, the demand for range hoods in urban housing has also continued to expand. However, the noise of range hoods It has always been a headache in the field of home appliances. The main noise comes from the noise generated by the vibration of the motor when it rotates at high speed and the noise generated by the wind blade cutting the air. The current range hood only adjusts the motor speed within the allowable range according to the national noise standard. Balance with the air volume, the use of active noise reduction technology can not only increase the motor speed, increase the air volume, but also reduce the noise to the level that people feel comfortable. However, there are many restrictions on active noise reduction in the market, such as the position of the fan. According to the requirements, it should not be too close to the air inlet, so that the distance between the noise source and the noise reduction position is too close, so that the noise reduction system cannot emit noise reduction waves in real time and stably. For side suction range hoods, the fan is located at the air inlet, and the noise reduction effect is almost 0, and because the shape and structure of range hoods are changing with each passing day and variety, the cost of system development for different models is high, and the reuse rate is low, resulting in a commercial utilization rate of almost 0.

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