JPS57173239A - Polygonal line compressing and expanding circuit - Google Patents

Polygonal line compressing and expanding circuit

Info

Publication number
JPS57173239A
JPS57173239A JP5853281A JP5853281A JPS57173239A JP S57173239 A JPS57173239 A JP S57173239A JP 5853281 A JP5853281 A JP 5853281A JP 5853281 A JP5853281 A JP 5853281A JP S57173239 A JPS57173239 A JP S57173239A
Authority
JP
Japan
Prior art keywords
data
input
bit
value
shift register
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
JP5853281A
Other languages
Japanese (ja)
Other versions
JPH0472421B2 (en
Inventor
Hiroo Okamoto
Takao Arai
Takashi Hoshino
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP5853281A priority Critical patent/JPS57173239A/en
Priority to US06/368,868 priority patent/US4682152A/en
Priority to EP82301972A priority patent/EP0063485B1/en
Priority to DE8282301972T priority patent/DE3279093D1/en
Publication of JPS57173239A publication Critical patent/JPS57173239A/en
Publication of JPH0472421B2 publication Critical patent/JPH0472421B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/007—Volume compression or expansion in amplifiers of digital or coded signals

Abstract

PURPOSE:To achieve polygonal line compression and expansion efficiently without using any range bit, by making compressed data correspond to an input in 1:1 proportion by giving an offset to the compressed data. CONSTITUTION:The sign bit of 14-bit ditital data applied to a terminal 1 is outputted to an output terminal 2 througha line 31, and the remaining 13 bits are inputted to a shift register 6 and a level comparator 9. A value at the boundary between ranges (1) and (2) stored in an ROM10 is compared with the input data and when the input data is greater, the data of the shift register 6 is shifted by one bit. When less, it is judged that the data from the input terminal 1 is in the range (1), and a value obtained by adding an offset (0 in this case) to the value of the shift register by an adder 7 is outputted as the compressed data to an output terminal 2. When the input data is greater, a value at the boundary between the ranges (2) and (3) is compared with the input data, and similar operation is performed thereafter.
JP5853281A 1981-04-20 1981-04-20 Polygonal line compressing and expanding circuit Granted JPS57173239A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP5853281A JPS57173239A (en) 1981-04-20 1981-04-20 Polygonal line compressing and expanding circuit
US06/368,868 US4682152A (en) 1981-04-20 1982-04-15 Digital data companding
EP82301972A EP0063485B1 (en) 1981-04-20 1982-04-16 Digital data companding
DE8282301972T DE3279093D1 (en) 1981-04-20 1982-04-16 DIGITAL DATA COMPANDING

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5853281A JPS57173239A (en) 1981-04-20 1981-04-20 Polygonal line compressing and expanding circuit

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP19791090A Division JPH0372723A (en) 1990-07-27 1990-07-27 Polygonal line compressing/expanding circuit

Publications (2)

Publication Number Publication Date
JPS57173239A true JPS57173239A (en) 1982-10-25
JPH0472421B2 JPH0472421B2 (en) 1992-11-18

Family

ID=13087037

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5853281A Granted JPS57173239A (en) 1981-04-20 1981-04-20 Polygonal line compressing and expanding circuit

Country Status (1)

Country Link
JP (1) JPS57173239A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6020066U (en) * 1983-07-19 1985-02-12 三洋電機株式会社 Data compression/expansion circuit
JPS6332767A (en) * 1986-07-28 1988-02-12 Hitachi Ltd Digital signal recording and reproducing system
JPH01105617A (en) * 1987-10-19 1989-04-24 Sanyo Electric Co Ltd Digital correction circuit
JPH01292669A (en) * 1988-05-19 1989-11-24 Sanyo Electric Co Ltd Digital signal reproducing device
JPH03155220A (en) * 1989-11-14 1991-07-03 Matsushita Electric Ind Co Ltd Data compressor and data expander

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5267546A (en) * 1975-12-02 1977-06-04 Matsushita Electric Ind Co Ltd Compression-expansion circuit system
JPS5353951A (en) * 1976-10-27 1978-05-16 Nippon Telegr & Teleph Corp <Ntt> Polygonal line apporoximation coder
JPS5394813A (en) * 1977-01-31 1978-08-19 Toshiba Corp Signal process system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5267546A (en) * 1975-12-02 1977-06-04 Matsushita Electric Ind Co Ltd Compression-expansion circuit system
JPS5353951A (en) * 1976-10-27 1978-05-16 Nippon Telegr & Teleph Corp <Ntt> Polygonal line apporoximation coder
JPS5394813A (en) * 1977-01-31 1978-08-19 Toshiba Corp Signal process system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6020066U (en) * 1983-07-19 1985-02-12 三洋電機株式会社 Data compression/expansion circuit
JPS6332767A (en) * 1986-07-28 1988-02-12 Hitachi Ltd Digital signal recording and reproducing system
JPH01105617A (en) * 1987-10-19 1989-04-24 Sanyo Electric Co Ltd Digital correction circuit
JPH01292669A (en) * 1988-05-19 1989-11-24 Sanyo Electric Co Ltd Digital signal reproducing device
JPH03155220A (en) * 1989-11-14 1991-07-03 Matsushita Electric Ind Co Ltd Data compressor and data expander

Also Published As

Publication number Publication date
JPH0472421B2 (en) 1992-11-18

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