30results about How to "Change noise" patented technology

Disclosed herein is an audio outputting device for switching a plurality of processes to perform a process on an audio signal, and acoustically reproducing and outputting the audio signal, the audio outputting device including, a control section for, when changing a process performed on an audio signal from one process to another process, stopping the one process on the audio signal, outputting sound based on the audio signal unprocessed by either of the one process and the other process, and performing the other process on the audio signal after passage of a predetermined period of time.

The invention provides a double axial-flow wind wheel system, comprising a first axial-flow wind wheel (1) and a second axial-flow wind wheel (2); wherein the rotate speed of the first axial-flow windwheel (1) is N1 circle/minute, the number of blade is Z1, and rotating basic frequency F1=Z1XN1/60 Hz; and the rotate speed of the second axial-flow wind wheel (w) is N2 circle/minute, the number ofblade is Z2, and rotating basic frequency F2=Z2XN2/60 Hz. The system is characterized in that the rotating basic frequency between the first axial-flow wind wheel (1) and the second axial-flow wind wheel (2) is in the range of 4-20 Hz. When being used in an outer machine of an air conditioning room with top wind out structure, side wind out structure or oblique upper wind out structure, because the rotating basic frequency between the first axial-flow wind wheel (1) and the second axial-flow wind wheel (2) is from 4 to 20 Hz, the system can change the rotating noise voice pressure and the voice powder of the double axial-flow wind wheel, thereby greatly weakening or completely removing the beat vibration formed by overlapping the rotating noise of the two wind wheels, obviously improving the tone quality of the outer machine system of the double axial-flow wind wheel, effectively preventing the metal plate structure from resonating, and reaching the aim of reducing the vibration and improving the reliability of the whole machine.

A propeller 33 is disposed on a bearing collar 42 to rotate about a shaft 10 of a lure 32. The propeller has a plurality of blades 36, each having a proximal portion 37 with a first degree of pitch and a distal portion 38 having a second degree of pitch which is different than said first degree of pitch. The blades may have distal ends which have the same direction of pitch as the proximal ends, or distal ends which have pitch opposite to that of the proximal ends. The blades may have straight bends or curved bends between the proximal and distal portions, and each blade may comprise a single, smoothly curvilinear surface. The blades may have one or more holes of various sizes in one or more blades of each propeller, either in the distal portion or the proximal portion of the blades. One or more propellers may be mounted on buzz baits, top water lures including plugs, and on other lures.

A compressor device for a compander system has a level detecting/control device and a pre-emphasis device for carrying out an adaptive pre-emphasis filtering. The invention is also directed to an expander device for a compander system with a level detecting/control device and a de-emphasis device for carrying out an adaptive de-emphasis filtering.

An actuator driving device drives an actuator connected to an output terminal. The control unit of the actuator driving device includes a PWM delay time setting unit, a first duty ratio setting unit, and a second duty ratio setting unit. The PWM delay time setting unit sets a delay time of pulse width modulation control for a driving voltage to be applied to the output terminal and outputs setting information to the first and second duty ratio setting units. The first duty ratio setting unit sets the first duty ratio for a first PWM output unit, and the second duty ratio setting unit sets the second duty ratio for a second PWM output unit. When positive and negative energization is performed, the control unit controls to reduce the amount of change in current in the current peak of a PWM waveform by providing a short-circuit period in response to the energization amount.

In an infrared detection element 15, a first substrate 36 is bonded to a front side of a pyroelectric substrate 20. Since the thermal expansion coefficient of the first substrate 36 is lower than that of the pyroelectric substrate 20, deformation of the pyroelectric substrate 20 due to thermal expansion can be suppressed by the first substrate 36. Further, since a thermal expansion coefficient difference D is 8.9 ppm/K or less, the thermal expansion coefficient between the first substrate 36 and the pyroelectric substrate 20 is not excessively large, and this can suppress deformation of the infrared detection element 15 due to the thermal expansion coefficient difference between the first substrate 36 and the pyroelectric substrate 20.

The invention provides a linear-driven multi-freedom-degree mechanical arm joint based on a smart material. Under the excitation of signals, a moving sliding block is pulled by an SMA driving wire to drive a split fork to move so as to pull a joint connecting frame to rotate, and the joint connecting frame is made to swing around the perpendicular plane with a shoulder end brace as a center. At a fore joint driving position, a moving sliding block is pulled by an SMA driving wire to pull a split fork to rotate, and a joint connecting frame is driven to swing around the horizontal plane with a shaft hole of the perpendicular plate side of the joint connecting frame as a center. At two fore joint driving positions, an SAM driving wire on a joint connecting frame drives a moving sliding block to drive the split fork to rotate around an outer side shaft hole of the joint connecting frame so as to drive an axial joint connecting frame to rotate in the axis direction, and the multi-freedom-degree movement of the mechanical arm joint is achieved finally. According to the linear-driven multi-freedom-degree mechanical arm joint based on the smart material, due to the fact that the SMA wires are adopted, the linear output of power driving can be achieved directly, and the defects of energy consumption and noise caused by using a middle mechanism in the axial driving of a traditional motor are overcome.

The invention discloses a comprehensive noise reduction and heat recovery system for a cement rotary kiln. The comprehensive noise reduction and heat recovery system comprises a rotary kiln platform arranged at the bottom of the rotary kiln, a cooling coil arranged at the top of the rotary kiln, air pipe air supply units arranged at the two ends of the rotary kiln platform, fans arranged at the input ends of the air pipe air supply units and noise elimination mechanisms arranged on the fans. A fan shock absorber is arranged below the fan; the draught fan is covered with a draught fan sound insulation cover. The silencing mechanism comprises a fan inlet silencer and a fan outlet silencer, and fan noise is jointly reduced through the fan inlet silencer, the fan outlet silencer, a fan sound insulation cover and a fan shock absorber; cooling air from the air pipe air supply unit is changed into hot air after cooling the rotary kiln, the cooling coil recovers heat from the hot air and heat radiation of the rotary kiln, then the rotary kiln body is cooled and waste heat is recovered in the rotary kiln production process of the cement plant, noise reduction and heat recovery are comprehensively considered, the noise reduction effect is guaranteed, heat recovery is increased, and the production efficiency is improved. And carbon emission and thermal pollution are reduced.

The invention discloses a refrigerating system of a refrigerator. The refrigerator comprises a refrigerating chamber inner container, a refrigerating chamber and a refrigerating chamber evaporator; anice-making assembly is arranged on the refrigerating chamber inner container and comprises an ice-making chamber and an ice-making machine; the refrigerating chamber inner container is provided withan air duct assembly, a cold air duct communicating with the refrigerating chamber evaporator is formed between the inner side of the refrigerating chamber inner container and the outer side of the air duct assembly, and the air duct assembly comprises an ice-making air duct and a refrigerating air duct; a refrigerating fan for supplying air to the refrigerating chamber is arranged in the refrigerating air duct, and the refrigerating fan discharges cold air to the refrigerating chamber from an air outlet; an ice-making fan for supplying air to the ice-making chamber is arranged in the ice-making air duct, and the ice-making fan discharges cold air to the ice-making chamber through an air supply pipeline; and the ice-making chamber and the refrigerating chamber share one refrigerating chamber evaporator and one cold air duct, the refrigerating air duct and the ice-making air duct are integrally formed, or the ice-making air duct is arranged in the refrigerating air duct. According to the system, the ice-making chamber and the refrigerating chamber share one refrigerating chamber evaporator, so that the number of refrigerator evaporators is reduced, the cost is reduced, the internalvolume of the refrigerator is increased, and a refrigerating structure of the refrigerator is simplified.

The invention discloses a high-power high-frequency reactor comprising a reactor body, the reactor body is composed of a magnetic core and a coil, the middle of the magnetic core is provided with thecoil, both the coil and the magnetic core are made of copper materials, the reactor body is a shell structure, the inner part of the shell structure is set in a centering type, the shell structure isformed by a block splicing group and ring stacked columns, magnetic path between rings of the block splicing group is independent without other artificial gaps, and the computability of the electromagnetic theory is good. The fixation of rings with glue is not needed, the coil and the ring-shaped magnetic core support each other and fix each other, and the adding of a special fastener for the magnetic core and the coil is not needed. The structure of the high-power high-frequency reactor is a shell structure, the centering type (block splicing group and ring stacked column type) has small magnetic leakage, the number of turns can be reduced in a product with the same inductance, the DC overlap characteristic is good, the amount of copper is reduced, the material cost is low, the product structure and process are simple, the high-power high-frequency reactor is easy to produce, and the labor cost is low.

A discharge muffler of a hermetic rotary compressor has a simple structure, and reduces the noises which occur due to pulsation of refrigerant and impact to a valve when the refrigerant, which is compressed in an inner space of a cylinder of the compressor, is discharged. The discharge muffler includes a muffler body which is disposed above an upper flange to define a noise reducing space with the upper flange, and has a pair of discharge openings through which the refrigerant, which is discharged to the noise reducing space, is discharged, and a phase varying means for preventing the noises which occur due to the pulsation of the refrigerant and the impact to the valve which is disposed at the discharge port, from being discharged together with the refrigerant. The phase varying means also functions to vary the phases of the noises and to counterbalance the noises. The phase varying means comprises a pair of covers which extend from the muffler body toward centers of the discharge openings to cover approximately half portions of the discharge openings from above and from below, respectively, in an alternating pattern. Accordingly, the noise, which is produced when the refrigerant is discharged, is blocked by a pair of covers which are disposed at the discharge openings, and the phases of the noises are varied, so that the noises are counterbalanced. As a result, the great noise reduction effect is guaranteed with a simple structure.

The invention belongs to the technical field of sewing machines and particularly relates to a transmission mechanism of a sewing machine. The transmission mechanism comprises a turnover shaft, a lower shaft and a tensioning wheel adjusting shaft. A large synchronous pulley is arranged on the turnover shaft. A lower shaft synchronous pulley is arranged on the lower shaft. A tensioning wheel is arranged on the tensioning wheel adjusting shaft. A double cogged synchronous belt is arranged outside the tensioning wheel and the large synchronous pulley. The tensioning wheel and a large gear are in connection and transmission with inner side teeth of the double cogged synchronous belt. The lower shaft synchronous pulley is in connection and transmission with outer side teeth of the double cogged synchronous belt. The turnover shaft is connected with an upper shaft through a transmission device and drives the upper shaft to act. According to the transmission mechanism, the double cogged synchronous belt does not need to be soaked into lubricating oil in the operation process, the design of a gearbox body on a base plate can be omitted, the structure is simplified, and the cost is saved; the tension of the double cogged synchronous belt can be adjusted through the tensioning wheel, and matching can be achieved without replacing synchronous belts of different length tolerances, so that difficulty of the assembling process is simplified, and use is more convenient.

The invention relates to a high-power superconductive heat radiator, with high speed, non noise and long service life. The invention can radiate the heat generated by high-power tube at electric circuit board, without using fan to radiate heat, to improve the product reliability and reduce noise.