36 results about "Decibel meter" patented technology

The invention provides a fault detector for a vehicle bearing, which judges by utilization of sound features of the bearing under the condition of fault. The detector comprises a connector, a driver, a decibel meter and a power module, wherein the connector is provided with a fixed component which is matched with a wheel axle hole of a wheel, and connected and fixed on the wheel; the driver drives the connector, drives the wheel to rotate, and simulates the running state of the wheel; the decibel meter measures the sound generated when the wheel is rotated, and respectively display values of high frequency components, medium frequency components and low frequency components; and the power module supplies power. The invention also discloses a method for detecting fault of the vehicle bearing. The fault detector for the vehicle bearing is importantly characterized in that the fault detector for the vehicle bearing quantizes the acquired sound according to high frequency, medium frequency and low frequency, takes quantized indexes as criterions, and avoids nondeterminacy caused by judgment in virtue of subjective experience.

The invention provides a silence reminder for a library. The silence reminder comprises a plurality of decibel meters, a single-chip microcomputer, an LED (light-emitting diode) display screen and a plurality of warning devices, wherein each decibel meter is arranged at a corresponding position of each seat of the library and is used for collecting sound signals at the corresponding seat of the library, converting the sound signals into electric signals and transmitting the electric signals and corresponding seat information of the library to the single-chip microcomputer; the warning devices are in one-to-one correspondence with the decibel meters, and each warning device is distributed at the corresponding position of the corresponding decibel meter; the single-chip microcomputer is used for controlling the displaying of the LED display screen according to the electric signals received from the decibel meters and controlling the start and stop of the corresponding warning devices according to the electric signals received from the decibel meters.

The invention relates to an automatic device for playing light music. The device comprises an automatic decibel meter, a music module and a starting / closing device. When the decibel meter determines that the voice is higher than a normal decibel, the starting device will open the music module to play a light, lively and graceful music. When the surrounding voice is lower than or equal to the normal decibel, the starting device will close the music module. The automatic decibel meter is any automatic decibel meter sold in market and the music in the music module can be preset by the manufacturer, stored by the user or downloaded from the internet by user. The invention has novel concept and smart design, plays an important role in relieving stress and mood, avoids the phenomena of unnecessary disputation and quarrel, and is beneficial to create a harmonious society.

Disclosed are various embodiments for security systems for schools and similar structures. Various security devices may be monitored in a structure, such as a school, where at least one of the security devices includes a wall-mounted duress alarm, an electronic keypad, a radio-frequency identification (RFID) reader, a card access reader, a decibel meter, a smoke detector, or a mobile computing device. In response to a signal from one of the security devices being indicative of a breach having occurred in the structure, a predetermined breach policy may be automatically implemented that may include, for example, compartmentalizing a region of the structure by performing an automated closing of a door that separates the region of the structure from another region of the structure.

The invention discloses an automatic baby stroller, which comprises a stroller body, a first handrail and a second handrail; the inner part of the stroller body is provided with a processor, a driving device, a decibel meter, a navigation device and a storage device; the decibel meter is used for measuring noise of ambient environment; the storage device is used for storing user information; the driving device, the decibel meter, the navigation device and the storage device are connected with the processor; the processor is connected with the mobile terminal, and the upper part of the stroller body is provided with an electric protective cover and a camera; the electric protective cover is connected with the driving device and used for protecting children in the stroller; the camera is connected with the processor and used for shooting surrounding environment; a fingerprint identifying device is arranged on the first handrail, and connected with the processor for identifying the identity of the stroller pusher; a first pressure sensor and a second pressure sensor are arranged on the first handrail and the second handrail respectively, and connected with the processor for detecting if anyone pushes the stroller.

The invention provides a fault detector for a vehicle bearing, which judges by utilization of sound features of the bearing under the condition of fault. The detector comprises a connector, a driver,a decibel meter and a power module, wherein the connector is provided with a fixed component which is matched with a wheel axle hole of a wheel, and connected and fixed on the wheel; the driver drivesthe connector, drives the wheel to rotate, and simulates the running state of the wheel; the decibel meter measures the sound generated when the wheel is rotated, and respectively display values of high frequency components, medium frequency components and low frequency components; and the power module supplies power. The invention also discloses a method for detecting fault of the vehicle bearing. The fault detector for the vehicle bearing is importantly characterized in that the fault detector for the vehicle bearing quantizes the acquired sound according to high frequency, medium frequencyand low frequency, takes quantized indexes as criterions, and avoids nondeterminacy caused by judgment in virtue of subjective experience.

The invention discloses a test device used for a buzzer. The test device comprises a bracket, a decibel meter, a plurality of thimbles, a test platform, a plurality of vertically-arranged guide rods, a press block and a driving device, wherein the thimbles are electrically connected with a power supply and are used for conducting a buzzer power supply; the test platform is used for bearing a buzzer base plate; the press block is arranged just above the input end of the buzzer power supply; the driving device is used for driving the pressing block to downwards move; the thimbles are arranged into one row to be fixed on a mounting seat; the row of thimbles is correspondingly arranged just below the input end of the buzzer power supply; the upper end of the bracket is provided with a strut used for installing the decibel meter; the upper ends of the guide rods are all fixedly connected with the test platform; the lower ends of the guide rods are in sliding fit in the through hole of the mounting seat; the outer circumstance of each guide rod is sheathed and provided with a spring; one end of the spring is abutted against the test platform; and the other end of the spring is abutted against the mounting seat. The test device used for the buzzer has the advantage of being simple in structure, convenient to operate, safe and reliable.