Patent ID: 6950466

Claim:
A memory reducing device of an apparatus for receiving moving pictures, comprising an adder adding IDCT data to motion-compensated data wherein the IDCT data is obtained by a video decoder; a deviation estimate g part calculating a standard deviation from an output signal of the adder; a storage buffer storing an output of the adder by macro block unit; an ADPCM encoder performing ADPCM compression by applying the standard deviation to data of the macro block unit stored in the storage buffer; a PCM buffer storage the ADPCM compressed data, quantization codes and the standard deviation; and a write memory reading the compressed data stored in the PCM buffer and storing the read data in an external memory, wherein the deviation estimating part comprises, a first predictive error outputting part selecting a pixel of video-decoded pixels prior to the current pixel, wherein the selected pixel has a least difference from the current pixel horizontally and vertically, an generating a difference between the selected pixel and the current pixel as a predictive error, and a second predictive error outputting part selecting a pixel of video-decoded pixels prior to the current pixel, wherein the selected pixel has a least difference from the current pixel horizontally and vertically, generating a difference between the selected pixel and the current pixel as a predictive error, and obtaining the predictive error by transforming a frame block into a field block if an image signal inputted thereto is an interlaced scanning sequence as well as a picture of the frame block.