Abstract: A digital video recorder is described. The digital video recorder may include a plurality of male slots, an image compression substrate connected to a first one of the plurality of male slots, and a function expansion substrate connected to a second one of the plurality of male slots. The image compression substrate may accommodate a plurality of image channels and may support a high-speed data bus dedicated for an image. The function expansion substrate may support a PCI type device. Moreover, the function expansion substrate and the image compression substrate may use separate buses, thereby improving system performance and speed.

Abstract: The present invention is related to a digital video recorder comprising a plurality of male slots, an image compression substrate including a plurality of channels, and a male-female connector connected to a lower surface of the image compression substrate and inserted into one of the plurality of male slots. A male connector may be arranged on a side surface of the male-female connector and may connect to a substrate female connector formed on the lower surface of the image compression substrate. A female connector may be arranged on another side surface of the male-female connector and may be inserted into the one of the plurality of male slots.

Abstract: A moving image compression/decompression apparatus and method that uses, for example, a wavelet transform technique in order to improve a compression rate is disclosed. The moving image compression/decompression apparatus includes an A/D converter for converting moving image data into digital data. The digital data is divided into a plurality of level regions using a wavelet transformer. The apparatus also includes a quantizer for quantizing the data that has been transform with a predetermined weight that corresponds to each of the regions. The apparatus also includes an SZT coder for performing a lossless DPCM coding with respect to the data quantized sequentially form a high level region to a low level regionusing a similarity between the level regions based on a predetermined SZT map.