JPS57101922A - Function converting circuit - Google Patents

Function converting circuit

Info

Publication number
JPS57101922A
JPS57101922A JP17720180A JP17720180A JPS57101922A JP S57101922 A JPS57101922 A JP S57101922A JP 17720180 A JP17720180 A JP 17720180A JP 17720180 A JP17720180 A JP 17720180A JP S57101922 A JPS57101922 A JP S57101922A
Authority
JP
Japan
Prior art keywords
exponent
argument
binary
mantissa
circuit
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
JP17720180A
Other languages
Japanese (ja)
Inventor
Nobuo Furuya
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.)
Anritsu Corp
Original Assignee
Anritsu 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 Anritsu Corp filed Critical Anritsu Corp
Priority to JP17720180A priority Critical patent/JPS57101922A/en
Publication of JPS57101922A publication Critical patent/JPS57101922A/en
Pending 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
    • H03M7/14—Conversion to or from non-weighted codes
    • H03M7/24—Conversion to or from floating-point codes

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Complex Calculations (AREA)

Abstract

PURPOSE:To obtain a function converting circuit having a small and wide dynamic range and a wide high resolution range, by converting a binary argument to a binary floating decimal, and applying its mantissa and exponent to a storage circuit an a storage address. CONSTITUTION:When a binary argument is applied to a circuit, a priority encoder 1 outputs 7 of a binary number when its exponent is ''1'' in such a way as ''0'' of a binary number when A9 through A15 are all ''0'', and ''1'' of a binary number when A10 through A15 are all ''0''. Subsequently, a multiplexer 2 receives A0 through A15 of the argument and an exponent being an output of the encoder 1, and outputs A8 through A15 when the exponent is 7 in such a way as A0 through A8 when the exponent is ''0'' and A1 through A0 when the exponent is ''1''. In this case, the output of the priority encoder 1 shows the exponent of the argument whose A8 only is ''1'', and the outut of the multiplexer 2 shows the mantissa. Accordingly, said mantissa and exponent are applied to a storage circuit 3 as a storage address, and a function corresponding to the argument is outputted.
JP17720180A 1980-12-17 1980-12-17 Function converting circuit Pending JPS57101922A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17720180A JPS57101922A (en) 1980-12-17 1980-12-17 Function converting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17720180A JPS57101922A (en) 1980-12-17 1980-12-17 Function converting circuit

Publications (1)

Publication Number Publication Date
JPS57101922A true JPS57101922A (en) 1982-06-24

Family

ID=16026937

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17720180A Pending JPS57101922A (en) 1980-12-17 1980-12-17 Function converting circuit

Country Status (1)

Country Link
JP (1) JPS57101922A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0578950A2 (en) * 1992-07-15 1994-01-19 International Business Machines Corporation Method and apparatus for converting floating-point pixel values to byte pixel values by table lookup

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5343446A (en) * 1976-10-01 1978-04-19 Agency Of Ind Science & Technol Function generating method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5343446A (en) * 1976-10-01 1978-04-19 Agency Of Ind Science & Technol Function generating method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0578950A2 (en) * 1992-07-15 1994-01-19 International Business Machines Corporation Method and apparatus for converting floating-point pixel values to byte pixel values by table lookup
EP0578950A3 (en) * 1992-07-15 1995-11-22 Ibm Method and apparatus for converting floating-point pixel values to byte pixel values by table lookup

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