Benq Corporation

Benq Intelligent Technology (shanghai) Co., Ltd

Shih-Pin Chen

Chin-Fu Chiang

Chi-Jen Chen

Chang-Sheng Lee

Chi-Hong Chen

Wen-Lun Chien

A vibration sensor senses vibrations generated by an object to generate a noise signal. A processor obtains a structure vibration level spectrum from the noise signal, uses equalization parameters and A-weighting parameters to adjust the structure vibration level spectrum to generate a sound pressure level spectrum, and uses the sound pressure level spectrum to calculate a noise value of the object.

Acoustic noise detection method and system using vibration sensor to detect acoustic noise

A light detection circuit for a projector is provided. The light detection circuit includes: a light transistor for receiving and sensing reflected light from a side of a color wheel driving motor of the projector, wherein the side of the color wheel driving motor includes a dark region and a bright region; a bias unit coupled to the light transistor for providing a bias voltage; an operation amplifier including a positive input coupled to the bias unit, a negative input coupled to the light transistor and the bias unit, and an output, the base unit providing the bias voltage to the positive input; and a feedback resistor coupled between the negative input of the operation amplifier and the output, wherein, a resistance of the feedback resistor causes the light transistor to be operated in a linear region.

Projector and light detection circuit and light detection method thereof

The invention is to provide a projector of external power supply, which comprises: a DC (direct current) power supply port, a step-up circuit, a voltage regulation circuit, a lamp, and an igniter. Wherein, a DC voltage provided from outside is received by the DC power supply port and is converted to a first electric potential by the step-up circuit. The first electric potential may actuate the igniter to light up the lamp and, after the lamp is lighted up, the step-up circuit regulates the working voltage of the lamp to a second potential voltage. Wherein, the first electric potential is higher than the second electric potential.

Growing community of inventors

Taoyuan, Taiwan

Shih-Pin Chen