JPS5625824A - Digital-analog converter - Google Patents

Digital-analog converter

Info

Publication number
JPS5625824A
JPS5625824A JP10211279A JP10211279A JPS5625824A JP S5625824 A JPS5625824 A JP S5625824A JP 10211279 A JP10211279 A JP 10211279A JP 10211279 A JP10211279 A JP 10211279A JP S5625824 A JPS5625824 A JP S5625824A
Authority
JP
Japan
Prior art keywords
bit
fed
random pattern
noise
white noise
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
JP10211279A
Other languages
Japanese (ja)
Other versions
JPS5945306B2 (en
Inventor
Takeshi Onishi
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP10211279A priority Critical patent/JPS5945306B2/en
Publication of JPS5625824A publication Critical patent/JPS5625824A/en
Publication of JPS5945306B2 publication Critical patent/JPS5945306B2/en
Expired 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
    • H03M1/06—Continuously compensating for, or preventing, undesired influence of physical parameters
    • H03M1/0617—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence
    • H03M1/0634—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence by averaging out the errors, e.g. using sliding scale
    • H03M1/0636—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence by averaging out the errors, e.g. using sliding scale in the amplitude domain
    • H03M1/0639—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence by averaging out the errors, e.g. using sliding scale in the amplitude domain using dither, e.g. using triangular or sawtooth waveforms
    • H03M1/0641—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence by averaging out the errors, e.g. using sliding scale in the amplitude domain using dither, e.g. using triangular or sawtooth waveforms the dither being a random signal
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Analogue/Digital Conversion (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)

Abstract

PURPOSE:To make the noise at low quantized bit into white noise, by producing the white noise with virtual random pattern. CONSTITUTION:The digital parallel signal fed to the input terminal 6 is fed to the upper rank M-bit from the MSB of the N-bit D/A converter 7. Further, from the M+1-th bit to N-th bit, the random pattern from the virtual random pattern generating circuit 8 is fed. Analog signal is output from the D/A converter 7 with the inputs and fed to the analog output terminal 9. At the D/A conversion, since the virtual random pattern is always present at the M+1-th bit to the N-th bit, even if the number of effective bits of the digital parallel signal is less, the quantized noise is mixed with white noise and good result in audible sense can be obtained.
JP10211279A 1979-08-10 1979-08-10 Digital to analog converter Expired JPS5945306B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10211279A JPS5945306B2 (en) 1979-08-10 1979-08-10 Digital to analog converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10211279A JPS5945306B2 (en) 1979-08-10 1979-08-10 Digital to analog converter

Publications (2)

Publication Number Publication Date
JPS5625824A true JPS5625824A (en) 1981-03-12
JPS5945306B2 JPS5945306B2 (en) 1984-11-05

Family

ID=14318711

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10211279A Expired JPS5945306B2 (en) 1979-08-10 1979-08-10 Digital to analog converter

Country Status (1)

Country Link
JP (1) JPS5945306B2 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6081935A (en) * 1983-10-12 1985-05-10 Trio Kenwood Corp Sound data expansion system of satellite broadcast receiver
JPS60128719A (en) * 1983-12-16 1985-07-09 Toshiba Corp Digital-analog converter
JPS62230120A (en) * 1986-02-28 1987-10-08 Teac Co Digital-analog converting method
JPS62260229A (en) * 1986-05-06 1987-11-12 Yamaha Corp Multiplying circuit
JPS62260227A (en) * 1986-05-06 1987-11-12 Yamaha Corp Multiplication circuit
JPS6367826A (en) * 1986-09-09 1988-03-26 Teac Co Digital/analog converting device
JPH03144600A (en) * 1989-10-31 1991-06-19 Nec Corp Voice decoder
US5550647A (en) * 1991-09-20 1996-08-27 Ricoh Company, Ltd. Image processing apparatus for converting a multilevel image signal into a bi-level image signal

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6081935A (en) * 1983-10-12 1985-05-10 Trio Kenwood Corp Sound data expansion system of satellite broadcast receiver
JPS60128719A (en) * 1983-12-16 1985-07-09 Toshiba Corp Digital-analog converter
JPH0444849B2 (en) * 1983-12-16 1992-07-23 Tokyo Shibaura Electric Co
JPS62230120A (en) * 1986-02-28 1987-10-08 Teac Co Digital-analog converting method
JPS62260229A (en) * 1986-05-06 1987-11-12 Yamaha Corp Multiplying circuit
JPS62260227A (en) * 1986-05-06 1987-11-12 Yamaha Corp Multiplication circuit
JPH0448253B2 (en) * 1986-05-06 1992-08-06 Yamaha Corp
JPH0451857B2 (en) * 1986-05-06 1992-08-20 Yamaha Corp
JPS6367826A (en) * 1986-09-09 1988-03-26 Teac Co Digital/analog converting device
JPH03144600A (en) * 1989-10-31 1991-06-19 Nec Corp Voice decoder
US5550647A (en) * 1991-09-20 1996-08-27 Ricoh Company, Ltd. Image processing apparatus for converting a multilevel image signal into a bi-level image signal
US5724158A (en) * 1991-09-20 1998-03-03 Ricoh Company, Ltd. Image processing apparatus for selectively using MTF correction process for different regions of a composite image

Also Published As

Publication number Publication date
JPS5945306B2 (en) 1984-11-05

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