76results about How to "Cancel sound" patented technology

Disclosed, in general, are devices that provide a substantially active noise canceling area over a sound source by causing disruptive interference to all frequency fields of speech sounds from the sound source. In some embodiments, active noise control or active noise cancellation means (“ANC means”) are provided to the device. Said means include one or more active noise canceling speakers for the addition of sound specifically designed to cancel noise from the speech sound source without interfering with the sound source going to the microphone, so the listener can clearly hear what the user is saying.

An apparatus and method for presenting high-quality auditory stimuli, receiving patient communication and providing noise cancellation within the environment of magnetic resonance imaging (“MRI”) equipment. A microphone is positioned in a noise attenuated channel for recording of the patient's voice. A microphone is disposed outside of a noise attenuated channel to directly record the sounds of MRI equipment during its operation. The signals generated by the microphones are employed to reduce the output of noise generated by MRI equipment.

Disclosed is a telephone headset that features an antiphase / anti-noise speaker within an anechoic chamber so that noises provided therein can be combated with antiphase noises. In some embodiment, the antiphase / anti-noise speaker can be an exciter. In some embodiments, the headset is designed to include passive and active noise cancellation of a use's voice. Suitably, the headset can be adjusted to fit an inclusive range of head dimensions comfortably, the headsets may connect wirelessly to the user's phone to ensure cable free operation and communication.

A slide block mechanism for a semi-automatic pistol that locks the slide in battery and prevents the slide from reciprocating when the pistol is discharged. The slide block mechanism consists of a pair of aligned notches formed in the bottom edge of the slide and the top of the frame, and a pivoting slide block lever mounted to the frame that selectively seats within either of the aligned notches. The slide block lever can be manually switched to engage and disengage the slide block mechanism and is independent of the fire control and slide stop assemblies. The slide block lever has a protrusion that seats within the slide notch when engaged to prevent the slide from moving rearward and seats within the frame notch when disengaged for allowing normal operation of the slide.

The invention discloses a sound signal detection and feedback device, which comprises a processing module, a sound collecting module, an operation module, a display module, a playing module and a network card; the processing module is electrically connected to the playing module, the sound collecting module, the network card, the operation module and the display module respectively module. The invention also provides an implementation method of the sound signal detection feedback device. The invention can detect not only the specified sample sound and the size of the sound, but also the sound with specific amplitude, specific frequency and specific spectral characteristics; using traditional network cable as the transmission medium, no special line needs to be laid, and the server uses a general software program , only need to be installed and configured on the existing computer, no need to purchase dedicated server equipment; real-time voice communication, built-in echo cancellation algorithm on the device side, used to eliminate the sound played by the speaker recorded by the local device microphone; the device has buttons, Support users to manually trigger alarm signals and send out voice communication requests with the server.

The invention provides a variable valve mechanism for a motorcycle engine with double overhead camshafts. The variable valve mechanism comprises a cylinder head, an exhaust camshaft, an exhaust rocker arm, an intake camshaft, a low-speed intake cam, a high-speed intake cam, an intake rocker arm and an electromagnet, wherein the exhaust camshaft and the intake camshaft are arranged in the cylinder head in parallel, the high-speed intake cam is arranged between the low-speed intake cam and a cam shaft front gland, a friction spring is arranged between the high-speed intake cam and the cam shaft front gland, an axial key groove C is formed in the tail end of the intake camshaft, a movable middle push rod is arranged in the key groove C, and the head end of the middle push rod abuts against a synchronous plug pin. The variable valve mechanism is suitable for a motorcycle engine with the double overhead camshafts, the valve timing can be changed when the engine is in the high-speed working condition and the low-speed working condition so that the engine can achieve the optimal performance, the structure control precision is high, the space arrangement is compact, and the sound generated when the synchronous bolt works is effectively eliminated.

The invention relates to drum leather used for an original sound drum and an electronic drum. The drum leather is formed by superposing a surface layer, a middle layer and a bottom layer together, wherein the surface layer used as a striking face adopts one of a dacron silk screen, a nylon silk screen, a chinlon silk screen and a polyester silk screen; the middle layer with the functions of soundsuppression and vibration damping adopts a dacron glue-spraying screen fabric; and the bottom layer used as a supporting layer adopts one of the dacron silk screen, the nylon silk screen, the chinlonsilk screen and the polyester silk screen. The drum leather used for the original sound drum and the electronic drum is formed by superposing the three layers of silk screens together. When the drum leather is used on the original sound drum, the middle layer made from a soft material can eliminate sound generated when a drumstick is struck on the surface layer, so that the original sound drum can not disturb residents and is suitable for a drummer to use during practice; and when the drum leather is used on the electronic drum, the middle layer can quickly and effectively attenuate vibrationgenerated when the drumstick is struck on the surface layer, so that the sounding accuracy of the electronic drum can be enhanced, and supporting facilities can also be simplified, thereby lowering the production cost.