6results about How to "Avoid noise problems" patented technology

The invention discloses an ultra-wideband weak signal detection method and system based on all-optical oscillation and phase-amplitude conversion. The method comprises the steps that spontaneous radiation light generated by an erbium-doped optical fiber amplifier is used as an optical carrier; modulating a weak radio frequency signal to be measured received by an antenna to the optical carrier through an optical modulator to form a modulated optical signal; the modulated optical signal is injected into an all-optical oscillation circuit composed of double loops, the all-optical oscillation circuit generates multimode optical oscillation by adjusting an optical attenuator, and the all-optical oscillation circuit comprises a double-loop interference structure; performing phase-amplitude conversion by adjusting the delay difference of the two light paths in the double loops to form an equivalent microwave photon filter so as to select and amplify the modulated light signal corresponding to the radio frequency signal of the set frequency band; and converting the selected and amplified modulated optical signal into an electric signal, and performing spectral analysis to detect the weak radio frequency signal to be detected.

The present application provides a kind of sound box's shockproof structure, it includes shockproof locking part, elastic arm and sound box assembly part.Shockproof locking part includes locking hole;Elastic arm is arranged in shockproof locking part;Sound box assembly part is arranged in elastic arm, and shockproof locking part and sound box assembly part are respectively arranged in two ends of elastic arm.Thereby, the present application can assemble shockproof locking part in electronic product, and assemble sound box assembly part in sound box, so that elastic arm is located between sound box and electronic product, and by elastic arm as the buffer and adjustment when sound box resonance, to avoid the vibration of sound box to be conducted to electronic product and produce abnormal sound, and achieve the effect of improving shockproof.

The utility model discloses a low -noise motorcycle engine cylinder cover belongs to cylinder cover technical field, it includes cylinder cover body, the inside wall of cylinder cover body is equipped with the noise reduction structure, the inside wall center place of cylinder cover body is equipped with cooling structure, the inside center upper place of cylinder cover body is equipped with support structure, the cooling structure includes cavity, the inside wall center place of cylinder cover body is equipped with the cavity, the inside center upper place of cavity is equipped with cooling pipe, in addition, the utility model discloses, can be targeted to attenuate valve knock, gas turbulence etc. high frequency noise, and the noise reduction amount reaches 10 15dB, solve the problem that high frequency noise penetrability is strong, simultaneously, absorb the vibration energy that cylinder body resonance and component low frequency impact produced, and the barrier efficiency improves 20 30%, solved the defect that low frequency noise suppression is insufficient, and, reduce gas leakage noise 8 12dB, also through the rigid vibration transmission of elastic contact reduction cylinder cover and cylinder, avoid resonance and produce additional noise.

This invention discloses a low-noise fan system, comprising: a pneumatic module, a drive module, an air intake module, and an air delivery module; the air intake module is located at the input end of the pneumatic module, the air delivery module is located at the output end of the pneumatic module, and the drive module is connected to the pneumatic module; the air intake module, pneumatic module, and air delivery module are sequentially connected; the pneumatic module includes a first impeller, a second impeller, guide vanes, and a volute; the drive module includes a first motor, a second motor, and a rotating shaft; the first impeller, guide vanes, and second impeller are sequentially arranged and housed inside the volute; the rotating shaft sequentially passes through the first impeller, guide vanes, and second impeller, with the second impeller corresponding to and engaging with the guide vanes; the first motor drives and connects to the first impeller; the second motor drives and connects to the second impeller. The low-noise fan system, through the second motor, can drive the second impeller to rotate in the opposite direction to the first impeller, thereby allowing the first and second impellers to cancel each other out rotational noise.

A display device and a backlight module are disclosed. The display device includes a backlight module and a display panel. The display panel is disposed on the backlight module. The backlight module includes a back plate, a lamp plate, a support column, a buffer member, and a diffusion plate. The lamp plate is disposed on an inner side surface of the back plate. The support column includes a base and a support structure. The support structure extends from the base. The back plate and the lamp plate are sandwiched between the base and the support structure. The buffer member is disposed on a top of the support structure. The diffusion plate is disposed on the lamp plate and the back plate at a distance. The diffusion plate abuts the buffer member. In an embodiment, the backlight module can include an elastic member sleeved on the support structure. Two ends of the elastic member abut the back plate and the base, respectively.