摘要:
Disclosed herein are a terrestrial digital multimedia broadcasting (DMB) tuner of a low intermediate frequency (IF) structure which is applied to a mobile communication terminal, such as a mobile phone, and an image rejection mixer applied thereto. In order to improve inter-channel attenuation characteristics, the image rejection mixer locates an oscillation frequency above or beneath the frequency of a target signal to include an image signal of the target signal in a terrestrial DMB band, mixes a radio frequency (RF) signal with the oscillation frequency, and outputs the resulting IF signals to a polyphase filter in a selected arrangement. Because the image signal of the target signal is included in the terrestrial DMB band, the image rejection mixer can satisfy the inter-channel attenuation characteristics without a troublesome or complex design.
摘要:
Disclosed herein is a receiver for down-conversion of a dual band. The receiver can down convert radio frequency signals of two different bands into a desired IF signal using only one voltage controlled oscillator (VCO), by dividing the output of the VCO into a predetermined ratio with a divider. The VCO outputs a desired oscillating frequency for conversion of the first-band RF signal into the IF signal, and the divider divides the desired oscillating frequency in a predetermined ratio to output a frequency for conversion of the second-band RF signal into the IF signal. Thus, the receiver can be formed on one silicon substrate.
摘要:
A compressor capable of reducing operational noise thereof through the use of a low-speed motor without a deterioration of compressive capability. The compressor comprises a hermetic casing, a compressing unit having a compression chamber to compress a refrigerant, a drive unit taking the form of a low-speed motor having four or more poles and adapted to provide power required to compress the refrigerant, and a charger adapted to increase the amount of the refrigerant to be introduced into the compression chamber.
摘要:
A hermetic compressor includes an exhaust pipe coupled to an exhaust port of an exhaust muffler. The exhaust pipe includes a support part to support the exhaust pipe on an outer surface of the exhaust muffler, and a flare part to support the exhaust pipe on an inner surface of the exhaust muffler. The support part outwardly extends from the exhaust pipe in a radial direction of the exhaust pipe. An inside end of the exhaust pipe is flared in a radial direction of the exhaust pipe, thus forming the flare part.
摘要:
Disclosed herein is a process for preparing an antimicrobial elastic fiber. The process comprises: mixing a glass compound, as an antimicrobial agent, containing ZnO, SiO2, and an alkali metal oxide, and having an average particle size of 0.1 μm to 5 μm, with a dispersant; sand grinding or milling the mixture; and adding the ground or milled mixture to a solution of a segmented polyurethane polymer to prepare an elastic yarn. The process can provide advantageous effects that spinnability is improved and the color of yarn remains unchanged.
摘要:
A broadcast receiver and a method for managing reserved recording information are disclosed. If a cell for a reserved recording list is added to an EPG (Electronic Program Guide), a user can easily check, modify, or delete all information associated with the reserved recording on the EPG, such that the user can conveniently manage the reserved recording information on the EPG. A method for managing reserved recording information of a broadcast receiver includes the steps of: a) receiving a reserved recording signal of a specific program; b) storing reserved recording information of the program on the basis of the reserved recording signal; and c) loading the stored reserved recording information, inserting the loaded reserved recording information into a pre-stored Electronic Program Guide (EPG), and creating an EPG-reserved recording list.
摘要:
A cooling-cycle device and a cold/hot water dispenser comprising the same are disclosed. The cold/hot water dispenser includes a water supply source and a cooling-cycle device in a main body to cool water of the water supply source. The cooling-cycle device includes a compressor, a condenser, an expansion unit, and an evaporator arranged to constitute a closed circuit through a refrigerant pipe and to allow the water from the water supply source to be cooled by the evaporator. The compressor comprises a closed container, a compressing unit including a compressing compartment to perform compression of refrigerant, a driving unit including a low-speed motor having four poles or more to supply compressing power according to the compression of the refrigerant, and a turbocharger to increase the amount of the refrigerant flowing to the compressing compartment. Even with the low-speed motor employed as the driving unit, the compressor can remarkably reduce operational noise without deteriorating cooling capability.
摘要:
A hermetic compressor comprising a pulsation damping flow path. The pulsation damping flow path is provided inside a discharge silencer, and is adapted to communicate the discharge silencer with a discharge chamber defined in a cylinder head. The pulsation damping flow path is formed to have a plurality of passages. Accordingly, by reducing a diameter of the respective passages down to a relatively small value compared to that of a conventional pulsation pipe, it is possible to considerably attenuate the pulsation of a refrigerant. Further, since the plural passages allow a constant amount of the refrigerant to continuously pass therethrough, it is possible to prevent an increase in a starting voltage of the compressor and the consumption of electricity thereof.
摘要:
Disclosed herein is a process for preparing an elastic fiber having a high modulus and superior resistance to alkali and heat. The process comprises the steps of adding 1˜20% by weight of a cellulose acetate to a polyurethane or polyurethaneurea solution, based on the total weight of the polyurethane or polyurethaneurea, homogeneously stirring the mixture to obtain a spinning solution, and ripening and spinning the solution. According to the process, a high modulus and highly heat resistant elastic fiber can be prepared without a sudden change in conditions for preparation of the polymer.
摘要:
A hermetic compressor includes a hermetic container; a compression unit arranged in the hermetic container that has a refrigerant compression chamber. A drive unit is configured to provide a refrigerant compression and a charger configured to deliver a refrigerant remaining in the hermetic container outside the refrigerant compression chamber into the refrigerant compression chamber. The charger may include a fan configured to rotate upon receiving a driving force from the drive unit, as well as a channel configured to deliver the refrigerant blown by the fan into the refrigerant compression chamber.