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 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.