Variable-length encoding-decoding system

Details Variable-length encoding-decoding system Variable-length encoding-decoding system

1984-03-06

1985-11-12

Shoop, Jr., William M.

Communications: electrical

Audible indication

Percussion-type sound producer

G11B 509

Patent

active

045531307

ABSTRACT:
A variable-length encoding device includes a shift register for converting a binary data string representing an audio signal into unit words of three 2-bit data (e.g., (1,1), (1,0), and (0,1) and two 3-bit data (e.g., (0,0,0) and (0,0,1). The 3-bit data words are obtained such that the remaining 2-bit data (i.e., (0,0)) is used as upper two bits of each of the resultant 3-bit data and is combined with each of the "1" and "0" data of the resultant 3-bit data. The output data words from the shift register are converted by a logic circuit to the corresponding code words in one-to-one correspondence. Each code word has a bit number twice that of the input data word. If a bit array (1,0,1) is included in the code word bit stream thus obtained, this bit array is further converted to (0,0,1).

REFERENCES:
patent: 3689899 (1972-09-01), Franaszek
patent: 4032979 (1977-06-01), Rice
patent: 4115768 (1978-09-01), Eggenberger et al.
patent: 4232388 (1980-11-01), Isailovic
Patent Abstracts of Japan, vol. 7, No. 23, Jan. 29, 1983 and JP-A-57-176519.
Patent Abstracts of Japan, vol. 6, No. 147, Aug. 6, 1982 and JP-A-57-69959.
Franaszek, "IBM Technical Disclosure Bulletin", vol. 23, No. 11, Apr. 1981, pp. 5229-5232.

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