Voice-activated switch and control method not affected by microphone sensitivity and environmental noise

Abstract

The invention discloses a voice operated switch uninfluenced by microphone sensitivity and environmental noise. The voice operated switch comprises a microphone bias circuit, a signal amplifier, a signal transfer device, a single chip machine and a controlled switch. A plurality of algorithms of sampling, subtraction, integral and division are adopted to process signals, which solves the harmful effect of the existing voice operated switch influenced by different environmental noises and microphone sensitivities. In service, if the environmental noise is low, the sound trigger sensitivity is automatically improved, accordingly the great sensitivity of the voice operated switch is guaranteed; if the environmental noise increases, the sound trigger sensitivity is automatically reduced, and accordingly the anti-noise ability is improved. The algorithm totally eliminates the harmful effect caused by different microphone sensitivities and amplification times of the signal amplifier, so thatrequirement of microphone sensitivity in batch production is decreased, and therefore productivity and product uniformity are greatly improved; meanwhile, the problem of the microphone sensitivity decline caused by the long-term use of the voice operated switch is solved.

Description

technical field [0001] The invention relates to the field of electronic voice-activated switches, in particular to a voice-activated switch and a control method that are not affected by microphone sensitivity and environmental noise. Background technique [0002] Voice-activated switches are often used to control lighting for energy-saving purposes. The voice-activated switch is sensitive to environmental noise. If the noise is small, the voice-activated switch is accidentally triggered and turned on, and the voice-activated light becomes a constant light. Therefore, the existing voice-activated switch overcomes the environmental noise by reducing the trigger sensitivity, but only makes a louder sound. Only when it is triggered, it is very inconvenient to use. Moreover, the sensitivity of the voice-activated switch is greatly affected by the sensitivity of the microphone, which brings many problems in mass production. In addition, due to the influence of environmental dust...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the existing voice-activated switches affected by environmental noise and different sensitivity of the microphone, to provide a voice-activated switch and its control method that are not affected by the sensitivity of the microphone and the environmental noise. If it is small, the sound trigger sensitivity will be automatically increased. If the ambient noise increases, the sound trigger sensitivity will be automatically reduced, thereby improving the ability to resist noise. If the microphone sensitivity changes, the trigger condition will be automatically changed according to the detected signal size, so that it is not affected by the different microphone sensitivity. impact, can work stably and reliably

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