JPS564930A - Bipolar analog-digital conversion system - Google Patents

Bipolar analog-digital conversion system

Info

Publication number
JPS564930A
JPS564930A JP8019779A JP8019779A JPS564930A JP S564930 A JPS564930 A JP S564930A JP 8019779 A JP8019779 A JP 8019779A JP 8019779 A JP8019779 A JP 8019779A JP S564930 A JPS564930 A JP S564930A
Authority
JP
Japan
Prior art keywords
signal
input
circuit
absolute value
digital
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
JP8019779A
Other languages
Japanese (ja)
Inventor
Tetsuzo Tanimoto
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 JP8019779A priority Critical patent/JPS564930A/en
Publication of JPS564930A publication Critical patent/JPS564930A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/18—Automatic control for modifying the range of signals the converter can handle, e.g. gain ranging

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Analogue/Digital Conversion (AREA)

Abstract

PURPOSE:To widen the input range of a bipolar A/D converter by converting the absolute value of an analog signal into a digital signal by a unipolar A/D converter and then by deciding the sign of the analog signal. CONSTITUTION:Analog signal 1 is input to absolute value circuit 2 to obtain its absolute value, which is converted into digital signals Dn-D1 by unipolar n-bit A/D converter 3 and they are input to one-side inputs of exclusive-OR circuit 6. At the same time, signal 1 is input to comparing circuit 4 whose reference voltage is zero to decide its polarity and information on it is sent to level converting circuit 5. When the information shows the positive, a signal of ''0'' is input from circuit 5 to the other-side input terminals of circuit 6 and when negative, a signal of ''1'' is also input. When signal 1 is positive, the digital converted signals of the absolute value appear at final digital outputs 8 as they are. When signal 1 is negative, adder circuit 7 obtains the complementary number of ''2'' of the digital converted signals of the absolute value as a digital converted signal of a negative value. Therefore, an input to the unipolar A/D converter can be utilized at a maximum.
JP8019779A 1979-06-27 1979-06-27 Bipolar analog-digital conversion system Pending JPS564930A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8019779A JPS564930A (en) 1979-06-27 1979-06-27 Bipolar analog-digital conversion system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8019779A JPS564930A (en) 1979-06-27 1979-06-27 Bipolar analog-digital conversion system

Publications (1)

Publication Number Publication Date
JPS564930A true JPS564930A (en) 1981-01-19

Family

ID=13711651

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8019779A Pending JPS564930A (en) 1979-06-27 1979-06-27 Bipolar analog-digital conversion system

Country Status (1)

Country Link
JP (1) JPS564930A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0313010A (en) * 1989-06-09 1991-01-22 Nec Corp Analog digital conversion circuit
JPH0313009A (en) * 1989-06-09 1991-01-22 Yamaha Corp Analog digital converter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0313010A (en) * 1989-06-09 1991-01-22 Nec Corp Analog digital conversion circuit
JPH0313009A (en) * 1989-06-09 1991-01-22 Yamaha Corp Analog digital converter

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