384results about How to "Reduce the amount of noise" patented technology

In some aspects, each cell in the communications system can be designed to operate in accordance with a set of back-off factors that identify the reductions in peak transmit power levels for the channels associated with the back-off factors. The back-off factors are defined to provide the required power to a large percentage of the users while reducing the amount of interference. In some other aspects, the cells operate using an adaptive reuse scheme that allows the cells to efficiently allocate and reallocate the system resources to reflect changes in the system. A reuse scheme is initially defined and resources are allocated to the cells. During operation, changes in the operating conditions of the system are detected and the reuse scheme is redefined as necessary based on the detected changes. For example, the loading conditions of the cells can be detected, and the resources can be reallocated and/or the reuse scheme can be redefined. In yet other aspects, techniques are provided to efficiency schedule data transmissions and to assign channels to users. Data transmissions can be scheduled based on user priorities, some fairness criteria, system requirements, and other factors. Users are assigned to available channels based on a number of channel assignment schemes. Channel metrics are also provided, which can be used to prioritize users and for channel assignments.

A minimally invasive fixation system and method for providing access to a surgical site. The fixation system may include a holding assembly, the holding assembling preferably including a lateral implant holder which may be attached to a pedicle screw and a sleeve positioned in connection with the lateral implant holder to prevent the lateral implant holder from separating from the pedicle screw. The sleeve may further include a tissue protection portion to keep the tissue out of the surgical site. A holding sleeve may be operably connected to the holding assembly and pedicle screw and may be used to insert the pedicle screw into the body. Multiple constructs may be inserted into the body so that a portion of the holding assembly extends from the body and provides access to and visualization of the surgical site. A rod holder may also be used to insert a rod into the head of the screw. The rod may be held by the rod holder so that the rod may be angulated as the rod is inserted into the screw heads. Once the rod is positioned in the screw heads, locking caps and/or set screws may be positioned over the rod and engage the screw heads so that the position of the rod may be fixed with respect to the screws. In some embodiments, a movement mechanism may be used to move the screws relative to each other to compress and/or distract the vertebrae.

Cell selection techniques for use in cellular communications systems are disclosed. A decision as to whether to use a cell for data transmission is made in dependence on a measure of a congestion level in the cell. The decision may either be part of a cell selection decision, or used to override a cell selection decision. The techniques may be used in fast cell site selection.

A method of recognizing characters in a document image comprises examining the intensity of pixels in the document image and identifying a peak intensity deemed to represent foreground in the document image. A threshold level for distinguishing the foreground from background in the document image as a function of the identified peak intensity is determined. The document image is thresholded using the threshold level to identify the foreground. Character recognition is performed on the foreground of the document image.

A user apparatus (100_n) according to the present invention includes: a maximum transmission power control unit (1083) configured to receive a control signal designating a frequency band in a downlink; and to control a maximum transmission power in a predetermined channel of an uplink; wherein the maximum transmission power control unit (1083) is configured to determine whether or not to decrease the maximum transmission power in a predetermined channel from a rated power regulated in the mobile communication system, according to the frequency band designated by the control signal.

A radio base station including a user equipment configured to execute radio communication with a base station device in a mobile communication system. The user equipment includes a control signal reception unit configured to receive a control signal providing instructions to transmit an uplink signal and an uplink signal transmission unit configured to transmit the uplink signal to the base station device on a basis of the control signal, the uplink signal transmission unit is configured to set a maximum value of transmission power of the uplink signal to be smaller than rated power defined by the mobile communication system on a basis of at least one of a parameter notified by the control signal and a number of transmission antennas or transmitters used for transmission of an uplink signal.

The invention comprises a method and apparatus for reducing the noise generated by compressors, including Roots-type blowers. The invention has particular use for reducing noise generated by compressors used in mechanical ventilators, though the advantages thereof may be realized in many different applications. One embodiment of the invention comprises a noise-attenuating gas flow path for a compressor contained in a portable ventilator housing. In one embodiment, the gas flow path comprises a plurality of chambers interconnected by flow tubes. The flow path is folded so as to fit into the limited space of a portable ventilator housing. The dimensions of the chambers and the flow tubes are selected so that an impedance mismatch is created between the chambers and the flow tubes. In one embodiment of the invention, the flow path comprises one or more perforated tubes located in one or more of the chambers. The perforated tube has a port through which gas is accepted and at least one exterior tube through which gas exits. Impedance mismatches are created between the inlet chamber and the exterior tubes and between the exterior tubes and the chamber in which the perforated tube is located, which are useful in attenuating noise. One embodiment of the invention comprises a noise attenuating mounting system for a compressor. The mounting system comprises flexible mounts that cooperate to dampen vibrations generated by the compressor.

In a method of imaging an object, for dental purposes, comprises:

• a) projecting a striped pattern on to the object to be imaged,
• b) recording the projected striped pattern as a basic image (R_i) with a camera, steps a) and b) being carried out at a number of different positions of the phase relationship of the striped pattern, and
• c) computing an image of the object from the plurality of mutually out-of-phrase basic camera images. Provision is made for suppression of periodic disturbances in that, in step c),
• c₁) at least two groups of basic images (R₁, R₂, . . . , R_n; R₂, R₃, . . . , R_n+1) are formed from the basic camera images (R₁, . . . , R_m),
• c₂) a phase related image (Pj) of the object to be imaged (20) is computed from each group of basic images (R₁, R₂, . . . , R_n; R₂, R₃, . . . , R_n+1),
• c₃) the computed phase related images (P₁, P₂) are averaged such that a phase related image (P) having a reduced amount of noise is formed, and that
• c₄) an image of the object is computed from the phase related image (P) having a reduced amount of noise.

A hair drying apparatus includes a body defining an air inlet, an air outlet and an air flow path therethrough. An impeller generates a flow of air from the air inlet, through the air flow path and to the air outlet. A motor drives the impeller and a heating element heats air flowing through the air flow path. The heating element, motor and impeller are supported within the body. A handle is mounted to the body and a housing is at least partially surrounded by the body and at least partially surrounds the air flow path. The motor is supported within the housing. At least one vibration isolation member is located between an inner surface of the body and an outer surface of the housing.

The invention discloses a high-load and high-precision pneumatic force measurement device and a measurement method. An internal balance tail-supported aerial vehicle model is adopted to execute pneumatic force test in the prior art, and rising force of an aerial vehicle perpendicularly works on a cantilever type tail rod, so that the model severely shakes during the test. The high-load and high-precision pneumatic force measurement device comprises a balance and a supporting rod, wherein the balance adopts an internal balance and is connected with a balance sleeve; the supporting rod is connected with an incidence angle sliding rail mechanism, a side sliding angle mechanism connected with the incidence angle sliding rail mechanism, and a mechanism control and data acquisition device; the supporting rod is adopted to be connected with the balance and support the model; the internal balance is adopted to measure the pneumatic force of the aerial vehicle model; the balance is externally connected with a sleeve structure and is also connected with a data acquisition device; the data acquisition system obtains the pneumatic force on the model and is connected with automatic control equipment; therefore, the pneumatic force on the model can be obtained. The high-load and high-precision pneumatic force measurement device and the measurement method are used for measurement in a pressurized high-density and low-speed wind tunnel.

A blade (1) for a tail anti-torque device of a helicopter, said device comprising a ducted rotor (13). The blade (1) has an assembly of sections, a leading edge (2) and a trailing edge (3); a stacking line (4) of the profiles extending at a distance lying in the range 25% to 50% of the chord (C). The stacking line (4) presents a shape that is curved having successively from the root (5) to the end (6) of the blade a back sweep, a forward sweep, and a last back sweep; and a chord (C) that becomes larger going towards the end (6) of the blade (1) over at least the end profile (1a).

A variable axis turbine may include multiple nested rotatable rotor assemblies. The turbine may be self-starting in slow fluid conditions while simultaneously self-limiting in fast fluid conditions. The turbine may provide omni-directional energy recovery and be self-balancing. The nested rotatable rotor assemblies may be configured to rotate independently of each other, but along the same rotational axis. Each outer nested rotor blade set may direct fluid onto the inner rotor blade sets in an aerodynamically beneficial manner. Each rotor blade set may be interconnected with a rotating generator hub that encloses a rotating generator element that rotates along with a corresponding rotor blade set for electric power generation. The blades may be “smart blades” that are sufficiently flexible to be self-configuring during rotation and soft enough to partially absorb sound. The blades may have a variable hardness and a two or more dimensional twist.

A technique for a time division multiplex system in which access to shared broadcast communication media is granted on a demand basis. Particular connections are assigned slot times at the transmitter based on demand. However, no specific information regarding the assignment of time slots need be communicated to the receivers. The transmit side employs a forward error correction technique followed by multiplication by a cover sequence unique to each connection. All receivers listen to the broadcast transmission channel all of the time. The receiver assigned to each connection decodes the signals in such a manner that only the receiver with the correct cover sequence assigned to a particular connection will successfully decode the data associated with that connection. Data frames that fail the forward error correction process are discarded, and only those frames which are successfully decoded are passed up to a higher layer. The occurrence of an erroneously received frame is not necessarily always reported to the transmit side of the connection; only a packet level error indication is made. In this way, information containing time slot assignment need not be communicated between the transmitter and receiver, and yet data will be correctly received.

A retractable chine assembly includes at least one chine which is hingebly mountable to a surface such as of an aircraft having a wing. The chine is preferably configured to be movable between stowed and deployed positions. The aircraft may include an engine nacelle which may be mounted on an underside of the wing. The nacelle may generate a nacelle wake that passes over the wing upper surface at high angles of attack and induces flow separation. The chine is preferably configured such that a vortex generated thereby interacts which the nacelle wake to delay flow separation and stall.

According to one embodiment, a method for reducing speckle in an image produced from a coherent light source includes directing a beam of coherent light at an electrically controlled diffuser. An electrical signal is applied to the electrically controlled diffuser to produce an electrical field across the electrically controlled diffuser layer. At least one of an amplitude and a frequency of the electrical signal are varied to transition the controlled diffuser between a first state and a second state. The varied application of the electrical signal operates to reduce spatial coherence in an image projected through the electrically controlled diffuser.

In a CDMA transmission, a quality of each symbol of a frame is held constant by interleaving spread chip, while overhead and interference amounts in other cells are reduced by easing a rate of transmission power control. Further, transmission power is decreased by discontinuing transmission at the time the quality is satisfied, thereby increasing the system capacity. Furthermore, it is possible to achieve more remarkable effect by performing inverse transmission power control.