JPS5731239A - Decoder - Google Patents

Decoder

Info

Publication number
JPS5731239A
JPS5731239A JP10692980A JP10692980A JPS5731239A JP S5731239 A JPS5731239 A JP S5731239A JP 10692980 A JP10692980 A JP 10692980A JP 10692980 A JP10692980 A JP 10692980A JP S5731239 A JPS5731239 A JP S5731239A
Authority
JP
Japan
Prior art keywords
circuit
bit
code
shifter
unequal length
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP10692980A
Other versions
JPH0214821B2 (en
Inventor
Kazumoto Iinuma
Original Assignee
Nec Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nec Corp filed Critical Nec Corp
Priority to JP55106929A priority Critical patent/JPH0214821B2/ja
Priority claimed from CA000382940A external-priority patent/CA1189974A/en
Publication of JPS5731239A publication Critical patent/JPS5731239A/en
Publication of JPH0214821B2 publication Critical patent/JPH0214821B2/ja
Anticipated expiration legal-status Critical
Application status is Expired - Lifetime legal-status Critical

Links

Classifications

    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03MCODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H03M7/30Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
    • H03M7/40Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T9/00Image coding
    • G06T9/005Statistical coding, e.g. Huffman, run length coding

Abstract

PURPOSE:To simplify the constitution of circuit and at the same time realize a high- speed operation, by using an array reverse converting circuit that converts the compressed data into an unequal length code having separated parallel bits. CONSTITUTION:The synchronous signal is detected out of the parallel 4-bit data in a memory 18 through a synchronous bit detecting circuit 19 of an unequal length code reverse converting circuit 36. The highest bit on a signal line 210 is delivered by a shifter which is controlled by a register 20 and a bit shift deciding circuit so that the highest bit becomes the 1st bit of the unequal length code that received an array reverse conversion. The output of a shifter 17 is decided by the 2nd code converter 15. Based on the result of this decision, the number of shifts is decided by a shift number deciding circuit consisting of an adder 21, a comparison/arithmetic circuit 16 and a register 22. Then the shifter 17 is controlled. Furthermore a control circuit 13 controls coders 14 and 15 based on the contents of a compressed code, and the original multi-value time series code is obtained from the coder 14 to be applied to a DPCM decoder 12.
JP55106929A 1980-08-04 1980-08-04 Expired - Lifetime JPH0214821B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55106929A JPH0214821B2 (en) 1980-08-04 1980-08-04

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP55106929A JPH0214821B2 (en) 1980-08-04 1980-08-04
CA000382940A CA1189974A (en) 1980-08-04 1981-07-31 Code conversion system
US06/550,946 US4534055A (en) 1980-08-04 1983-11-14 Code conversion system

Publications (2)

Publication Number Publication Date
JPS5731239A true JPS5731239A (en) 1982-02-19
JPH0214821B2 JPH0214821B2 (en) 1990-04-10

Family

ID=14446088

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55106929A Expired - Lifetime JPH0214821B2 (en) 1980-08-04 1980-08-04

Country Status (1)

Country Link
JP (1) JPH0214821B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6156522A (en) * 1984-07-28 1986-03-22 Fujitsu Ltd Variable length dpcm decoding circuit
JPS62136131A (en) * 1985-12-10 1987-06-19 Canon Inc Data decoder

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0468129A (en) * 1990-07-06 1992-03-03 Hitachi Constr Mach Co Ltd Device for connecting pin

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3971888A (en) * 1975-04-02 1976-07-27 Bell Telephone Laboratories, Incorporated Synchronization system for variable length encoded signals

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3971888A (en) * 1975-04-02 1976-07-27 Bell Telephone Laboratories, Incorporated Synchronization system for variable length encoded signals

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6156522A (en) * 1984-07-28 1986-03-22 Fujitsu Ltd Variable length dpcm decoding circuit
JPS62136131A (en) * 1985-12-10 1987-06-19 Canon Inc Data decoder

Also Published As

Publication number Publication date
JPH0214821B2 (en) 1990-04-10

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