Abstract: Disclosed are a negative C-type compensation film and a method of preparing the same. The negative C-type compensation film includes a) a base layer, and b) a polymer layer comprising polyarylate prepared by a method comprising the step of copolymerizing divalent phenols, divalent aromatic carboxylic acid halides, and allyl bisphenol derivatives, the base layer and the polymer layer being sequentially layered. The compensation film is capable of being used for the negative C-type compensation film without a stretching process, significantly reduces the thickness of the compensation film, and has significantly improved interlayer adhesion force in a multilayer structure.

Abstract: The present invention relates to a resin composition for an optical film, comprising a polyarylate resin and an amino resin having a triazine structure, and to an optical film prepared by using the same. By using the resin composition for an optical film, a thickness direction retardation can be controlled, while having a negative value, during a step of fabricating the optical film, an in-plane retardation can be controlled, and the optical film can be used as a substrate of a display instead of a glass substrate without an additional retardation compensation film.

Abstract: Embodiments of methods, apparatuses, devices and systems associated with compression and decompression of digital signals are disclosed.

Abstract: The present invention relates to a process for preparing polyarylate, and more specifically, to a process for preparing polyarylate by interfacial polymerization of a bivalent phenol compound and an aromatic dicarboxylic acid or a halide thereof, which comprises mixing a cationic catalyst for the phase transition and a nonionic surfactant in a predetermined ratio, to further increase the yield of polyarylate, as compared with the case of using each of the nonionic surfactant and the cationic catalyst for the phase transition alone.

Abstract: A unified filter bank for performing signal conversions may include an interface that receives signal conversion commands in relation to multiple types of compressed audio bitstreams. The unified filter bank may also include a reconfigurable transform component that performs a transform as part of signal conversion for the multiple types of compressed audio bitstreams. The unified filter bank may also include complementary modules that perform complementary processing as part of the signal conversion for the multiple types of compressed audio bitstreams. The unified filter bank may also include an interface command controller that controls the configuration of the reconfigurable transform component and the complementary modules.

Abstract: Disclosed is a negative C-type retardation compensator for a liquid crystal display. The negative C-type retardation compensator for the liquid crystal display includes polyarylate having a thio group or a sulfur oxide group in a polymer main chain thereof. Accordingly, the retardation compensator has an absolute value of negative retardation that is larger in a thickness direction than a retardation compensator which includes polyarylate having no thio group or sulfur oxide group in a polymer main chain thereof even though the retardation compensator having the thio group or sulfur oxide group and the retardation compensator having no thio group or sulfur oxide group are the same as each other in thickness. Thereby, the negative C-type retardation compensator for liquid crystal displays is capable of being desirably applied to the liquid crystal displays.

Abstract: A process for preparing polyarylate wherein a bivalent phenol compound having the structure of Formula 1 and an aromatic dicarboxylic acid halogen compound react to prepare a polyarylate, and wherein a nonionic surface-active agent is added. This decreases residual salts and improves the transmittance and the heat-resistance. In Formula 1, R1, R2, R3 and R4 denote the same as illustrated in the description.

Abstract: The present invention relates to a polyarylate film having high level of negative phase difference toward out of plane direction, which is good enough to be used as an optical compensator film providing wide view angle. The polyarylate film prepared in the present invention has bigger birefringence toward out of plane direction than that of polymer for the conventional compensator film, suggesting that it not only reduces the thickness of the final product but also has the effect of optical compensation only with thin film coating.

Abstract: The present invention relates to a compensator film having multilayer structure including both negative optical retardation in thickness direction and optical retardation in in-plane direction at the same time to improve wide view angle, in which a polymer base layer provides optical retardation in in-plane direction, organic or organic/inorganic hybrid protective layer formed on the base layer contributes to the improvement of mechanical properties such as curl prevention and polymer orientation of coating layer, and the out-most layer, a polymer coating layer, endows optical retardation in thickness direction. The multilayer, in which each layer is individually functioning, enables the preparation of a compensator film having proper optical retardation.

Abstract: Encoder-assisted frame loss concealment (FLC) techniques for decoding audio signals are described. A decoder may discard an erroneous frame of an audio signal and may implement the encoder-assisted FLC techniques in order to accurately conceal the discarded frame based on neighboring frames and side-information transmitted from the encoder. The encoder-assisted FLC techniques include estimating magnitudes of frequency-domain data for the frame based on frequency-domain data of neighboring frames, and estimating signs of the frequency-domain data based on a subset of signs transmitted from the encoder as side-information. Frequency-domain data for a frame of an audio signal includes tonal components and noise components. Signs estimated from a random signal may be substantially accurate for the noise components of the frequency-domain data.

Abstract: The present invention relates to a process for preparing polyarylate having a high heat-resistance and a high transmittance with a low residual salt, more particularly to a process for preparing polyarylate wherein a bivalent phenol compound having the structure of Formula 1 and an aromatic dicarboxylic acid halogen compound are reacted by a interfacial polymerization to prepare a polyarylate, characterized in that a nonionic surface-active agent is added. The polyarylate prepared by the process of the present invention acquires an excellent effect to decrease residual salts and to improve the transmittance and the heat-resistance highly. <Formula 1> In the above Formula 1, R1, R2, R3 and R4 denote the same as illustrated in the description.