초록 ▼

A computer-based video compression system for processing natural information signals, such as video signals or audio signals, for the purpose of forming a compact data file of compressed signals which can be expanded to produce the original information signals is provided by a unique subsystem in a

A computer-based video compression system for processing natural information signals, such as video signals or audio signals, for the purpose of forming a compact data file of compressed signals which can be expanded to produce the original information signals is provided by a unique subsystem in a host computer which uses a high speed signal processor to compress video images and to expand video images. The unique compression process uses segmentation and predictive techniques in conjunction with a discrete sine transform, quantization and Huffman coding to provide optimal compression. Further the segmentation and predictive techniques in conjunction with the discrete sine transform diminish the magnitude of correlated errors generated by the compression process. The compression system of this invention is further enhanced by a special circuit which transfers data between the host computer and the compression subsystem at rates greater than were previously possible.

대표청구항 ▼

A system for compression and expansion of a frame of analog information comprising: a first subsystem comprised of an analog to digital processor and a first random access memory (RAM); a second subsystem for compression and expansion of digital data comprising: a second random access memory (RAM);

A system for compression and expansion of a frame of analog information comprising: a first subsystem comprised of an analog to digital processor and a first random access memory (RAM); a second subsystem for compression and expansion of digital data comprising: a second random access memory (RAM); means for compressing data operatively connected to said second RAM; means for expanding data operatively connected to a said second RAM; a third RAM for storing said compressed data; means for data management operatively connected to said first RAM, to said second RAM, and to said third RAM; means for processing said frame of analog information; wherein said means for processing said frame of analog information generates an analog signal representing information in said frame; said means for processing said frame of analog information being operatively connected to said analog to digital processor so that said analog signal is an input signal to said analog to digital processor; said analog to digital processor converting said analog signal to a frame of digital data; said first RAM being operatively connected to said analog to digital processor so that said frame of digital data is stored in said first RAM; said system having a first mode of operation wherein; said means for data management transfers a selected portion of said stored digital data from said first RAM to said second RAM; said means for compressing data retrieves said selected portion of digital data from said second RAM; compresses said selected portion, and stores said compressed data in said second RAM; said means for data management transfers said compressed data from said second RAM to said third RAM; said system having a second mode of operation wherein; said means for data management transfers a selected portion of said compressed data from said third RAM to said second RAM; said means for expanding data retrieves said selected portion of said compressed data from said second RAM; expands said selected portion; and stores said expanded data in said second RAM; and said means for data management transfers said expanded data from said second RAM to said first RAM.