JPS5779731A - D-a converter - Google Patents

D-a converter

Info

Publication number
JPS5779731A
JPS5779731A JP15633680A JP15633680A JPS5779731A JP S5779731 A JPS5779731 A JP S5779731A JP 15633680 A JP15633680 A JP 15633680A JP 15633680 A JP15633680 A JP 15633680A JP S5779731 A JPS5779731 A JP S5779731A
Authority
JP
Japan
Prior art keywords
signal
resistor
diode
circuit
time constant
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
JP15633680A
Other languages
Japanese (ja)
Other versions
JPH0127613B2 (en
Inventor
Masaaki Fujita
Kazumi Kawashima
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP15633680A priority Critical patent/JPS5779731A/en
Publication of JPS5779731A publication Critical patent/JPS5779731A/en
Publication of JPH0127613B2 publication Critical patent/JPH0127613B2/ja
Granted 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
    • H03M1/66—Digital/analogue converters
    • H03M1/82—Digital/analogue converters with intermediate conversion to time interval
    • H03M1/84—Non-linear conversion

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Logic Circuits (AREA)
  • Analogue/Digital Conversion (AREA)

Abstract

PURPOSE:To obtain a nonlinear analog signal, by applying a pulse signal in which the duty ratio is changed according to an input digital signal to a smoothing circuit via a parallel circuit of a resistor and a diode. CONSTITUTION:A digital signal for sound volume adjustment is applied to a pulse generating circuit 1 and converted to a pulse signal having the duty ratio on the digital value to switch a transistor (TR)2. The output of the TR2 is applied to a smoothing circuit 7 via a parallel circuit consisting of a diode 6 and a resistor 4. The output analog signal of the smoothing circuit 7 has a nonlinear characteristic to the input digital signal since the charge/discharge time constant of a time constant circuit consisting of a capacitor 5, diode 6 and resistor 4 has different charge/discharge time constant. Characteristics of types B and C can be obtained by applying the analog signal of this output to a variable gain amplifier 12 for gain control.
JP15633680A 1980-11-05 1980-11-05 D-a converter Granted JPS5779731A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15633680A JPS5779731A (en) 1980-11-05 1980-11-05 D-a converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15633680A JPS5779731A (en) 1980-11-05 1980-11-05 D-a converter

Publications (2)

Publication Number Publication Date
JPS5779731A true JPS5779731A (en) 1982-05-19
JPH0127613B2 JPH0127613B2 (en) 1989-05-30

Family

ID=15625541

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15633680A Granted JPS5779731A (en) 1980-11-05 1980-11-05 D-a converter

Country Status (1)

Country Link
JP (1) JPS5779731A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61329U (en) * 1984-06-05 1986-01-06 三菱電機株式会社 Digital to analog conversion circuit
US5317400A (en) * 1992-05-22 1994-05-31 Thomson Consumer Electronics, Inc. Non-linear customer contrast control for a color television with autopix

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4423177Y1 (en) * 1964-07-03 1969-09-30
JPS53133987U (en) * 1977-03-31 1978-10-24

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4423177Y1 (en) * 1964-07-03 1969-09-30
JPS53133987U (en) * 1977-03-31 1978-10-24

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61329U (en) * 1984-06-05 1986-01-06 三菱電機株式会社 Digital to analog conversion circuit
US5317400A (en) * 1992-05-22 1994-05-31 Thomson Consumer Electronics, Inc. Non-linear customer contrast control for a color television with autopix
TR27365A (en) * 1992-05-22 1995-01-17 Thomson Consumer Electronics Non-linear customer contrast control for a color television with autopix.

Also Published As

Publication number Publication date
JPH0127613B2 (en) 1989-05-30

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