Abstract:
The present invention provides a vibration audio system for transmitting an audio signal outputted from a sound source to a listener in the form of vibration while reducing output level of the signal and power consumption. The system includes an envelope detection unit (204) for detecting an envelope signal of the audio signal outputted from a sound source, a vibration transmission member for allowing the listener to perceive vibration of a low-frequency sound outputted from a low-frequency output speaker that outputs audio signals, and a frequency conversion unit (205) for generating an audio signal frequency-converted on the basis of resonant frequencies by multiplying the envelope signal by sine waves having the same frequencies as resonance frequencies obtained from an impulse response of the low-frequency output speaker disposed in the vibration transmission member. The audio signal frequency-converted by the frequency conversion unit (205) is outputted from the low-frequency output speaker.
Abstract:
The invention relates to a handheld power tool (100) with a drive unit (103) for vibrating an insert tool (130), said drive unit having at least one excitation actuator (105) which can vibrate and which is coupled to a coupling element (110) in order to transmit vibrations to the insert tool (130). The vibrations are generated by the excitation actuator (105) during the operation of the drive unit (103) when a specified actuation voltage is applied to the excitation actuator (105), said excitation actuator (105) having at least one excitation element (132, 134) which is made of a piezoelectric material. According to the invention, a temperature sensor (199) is paired with the excitation actuator (105) in order to detect the respective current operating temperature of the excitation actuator in order to allow an adaptation of the specified actuation voltage dependent on the respective current operating temperature.
Abstract:
A stain removing device is provided. The device will not make hands tired, and can remove stains with a constant knocking force and speed throughout and steadily supply liquid needed to remove stains. The stain removing device (100) includes a head part (1) forming a knocking surface (111), a vibration unit (2) causing the head part (1) to vibrate in a direction substantially orthogonal to the knocking surface (111) by supplying power, a liquid containing part (3) for containing liquid, and a water supply path (4) of its one end (41a) is connected to the liquid containing part (3) and the other end (1121h) being opened around the head part (1). The water supply path (4) is configured to supply the liquid to the periphery of the head part (1) via the other end (1121h), along with the vibration of head part (1) caused by the vibration unit (2).