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JPS5673934A - Huffman encoding method for signal having correlation between sample points - Google Patents

Huffman encoding method for signal having correlation between sample points

Info

Publication number
JPS5673934A
JPS5673934A JP15035179A JP15035179A JPS5673934A JP S5673934 A JPS5673934 A JP S5673934A JP 15035179 A JP15035179 A JP 15035179A JP 15035179 A JP15035179 A JP 15035179A JP S5673934 A JPS5673934 A JP S5673934A
Authority
JP
Japan
Prior art keywords
output
signal
circuit
line
signal line
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.)
Granted
Application number
JP15035179A
Other languages
Japanese (ja)
Other versions
JPS5946456B2 (en
Inventor
Satoshi Hasegawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
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, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP15035179A priority Critical patent/JPS5946456B2/en
Publication of JPS5673934A publication Critical patent/JPS5673934A/en
Publication of JPS5946456B2 publication Critical patent/JPS5946456B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion 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
    • H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
    • H03M7/40—Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code
    • H03M7/42—Conversion to or from variable length codes, e.g. Shannon-Fano code, Huffman code, Morse code using table look-up for the coding or decoding process, e.g. using read-only memory

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

PURPOSE:To avoid the decrease of encoding efficiency, by changing the Huffman code to a digital signal when correlation is present between sample points, depending whether there is a change in the polarity of signal between one sample prcedent point and present sample point or not. CONSTITUTION:The input signal on a signal line 451 is input to a circuit 400, and an output 1 is made on an output line 452 if the sign of positive or negative is changed and the output is fed to a control circuit 402. When the output 1 is made, the control circuit outputs 0 to the output line 454 during the clock and outputs 1 afterward, and if output 0, 1 is output on the output line 454. On the other hand, the signal on a signal line 451 is converted into an absolute value at an absolute value conversion circuit 401 and output on a signal line 453 and input to a Huffman encoding circuit 403. Further, when the signal line 454 is at 1, the Huffman code is output on a signal line 455 in synchronizing with the clock, and if 0, no signal is output. At the multiplexer 405, either the output of change sign production circuit 404 or that of the circuit 403 is selected with the content of the signal 454, and if the sign is changed, the change code is added to the Huffman code of absolute value.
JP15035179A 1979-11-20 1979-11-20 Huffman encoding method for signals with correlation between sample points Expired JPS5946456B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15035179A JPS5946456B2 (en) 1979-11-20 1979-11-20 Huffman encoding method for signals with correlation between sample points

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15035179A JPS5946456B2 (en) 1979-11-20 1979-11-20 Huffman encoding method for signals with correlation between sample points

Publications (2)

Publication Number Publication Date
JPS5673934A true JPS5673934A (en) 1981-06-19
JPS5946456B2 JPS5946456B2 (en) 1984-11-13

Family

ID=15495085

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15035179A Expired JPS5946456B2 (en) 1979-11-20 1979-11-20 Huffman encoding method for signals with correlation between sample points

Country Status (1)

Country Link
JP (1) JPS5946456B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5986944A (en) * 1982-11-01 1984-05-19 エス・ア−ル・アイ・インタ−ナシヨナル Method and device for digital huffman encoding

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0526698Y2 (en) * 1986-08-11 1993-07-06

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5986944A (en) * 1982-11-01 1984-05-19 エス・ア−ル・アイ・インタ−ナシヨナル Method and device for digital huffman encoding

Also Published As

Publication number Publication date
JPS5946456B2 (en) 1984-11-13

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