Active noise compensating device for use in e.g. washing machine, has microphone detecting sound wave to be reduced, where sound wave is transmitted to signal processing and signal evaluating unit

摘要

The device has a sensor (2) for activating and deactivating the device, and the sensor, a microphone (3) and an acoustic source (6) are connected with a signal processing and signal evaluating unit (5). The microphone detects a sound wave to be reduced, where the sound wave is transmitted to the signal processing and signal evaluating unit, which activates the acoustic source (6) for outputting the sound wave to be reduced. The microphone detects the reduction of the sound level by the opposite cancellation of the sound waves.