The invention relates to a communication system and method. The system involves a novel transmitting system and method and a novel receiving system and method.
Data compression and transmission is highly desirable as saving bandwidth or time of transmission or both. Accordingly, efforts have been made to reduce the time of transmission and compress bandwidth by various means.
U.S. Pat. No. 3,334,335, issued Aug. 1, 1967 to Brick et al. for "Electronic Data Processing" mentions a system in which a word is received in one language and produces an address as an output in response to the word input. The patent itself is concerned with a system in which a second or foreign language word is read out. It also describes systems in which a memory stores each word, an input word being compared with the stored word and a signal generated when a match is found. This match signal is subsequently used to determine the address of the correct stored word. The patent itself is concerned with the indication for match and mismatch of the words.
In another patent, U.S. Pat. No. 3,717,851, issued Feb. 20, 1973 to Cocke et al. for "Processing of Compacted Data," compacted data in the form of variable length codes are employed. These have length-representing prefix portions which are variable-length encoded. The variable length prefixes are decoded by small, fast, search-only associative memories which provide a match-indicating signal as an address to a second memory having conventional storage elements. The output of the last main memory may contain a base address to still another memory and a indication of the bits remaining in the variable length code word.
In U.S. Pat. No. 3,400,380, dated Sept. 3, 1968 to Packard et al. for "Digital Computer Having an Address Controller Operation," there is described a computer system in which digit, or four bit data representations, are transferred to character or eight bit format.
Other examples of conversion systems are described in U.S. Pat. No. 3,229,047 of Jan. 11, 1966 to Simpson for "Data Conversion Systems"; U.S. Pat. No. 3,662,347 of May 9, 1972 to Fox for "Signal Compression and Expansion System Using a Memory"; U.S. Pat. No. 3,778,617 of Dec. 11, 1973 to Calhoun for "Container Inspection Apparatus"; and U.S. Pat. No. 4,032,913, issued June 28, 1977 to Okamura et al. for "Coding Equipment Providing Compressed Code."