JPS5714264A - Analog-to-digital converter - Google Patents

Analog-to-digital converter

Info

Publication number
JPS5714264A
JPS5714264A JP8870680A JP8870680A JPS5714264A JP S5714264 A JPS5714264 A JP S5714264A JP 8870680 A JP8870680 A JP 8870680A JP 8870680 A JP8870680 A JP 8870680A JP S5714264 A JPS5714264 A JP S5714264A
Authority
JP
Japan
Prior art keywords
signal
analog
output
comparator
converter
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
JP8870680A
Other languages
Japanese (ja)
Inventor
Yoshikazu Yokomizo
Toshihiko Nakazawa
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP8870680A priority Critical patent/JPS5714264A/en
Publication of JPS5714264A publication Critical patent/JPS5714264A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/12—Systems in which the television signal is transmitted via one channel or a plurality of parallel channels, the bandwidth of each channel being less than the bandwidth of the television signal

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Analogue/Digital Conversion (AREA)

Abstract

PURPOSE:To avoid the set level and gain from being changed by external variance causes such as ambient temperature, by feeding back to an analog signal according to the output of a comparator compared with the set value for a digital signal. CONSTITUTION:A video signal digitized at an A-D converter 3 is again an analog signal at a D-A converter 4 and outputted to an output terminal 5. A signal A digitized is applied also to a comparator 6. When the data A is greater than the reference binary data B, the output line A>B of the comparator 6 is at H level and a J input of an FF8 is at H, and the Q output is at H when a black signal detecting pulse OBLACK is put in. Thus, an analog switch 9 selects -5V, it is integrated with an integrator 10 and the signal line connected to an adder 2 is gradually negative and overall analog video signal is lowered and movement is made toward black.
JP8870680A 1980-06-30 1980-06-30 Analog-to-digital converter Pending JPS5714264A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8870680A JPS5714264A (en) 1980-06-30 1980-06-30 Analog-to-digital converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8870680A JPS5714264A (en) 1980-06-30 1980-06-30 Analog-to-digital converter

Publications (1)

Publication Number Publication Date
JPS5714264A true JPS5714264A (en) 1982-01-25

Family

ID=13950322

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8870680A Pending JPS5714264A (en) 1980-06-30 1980-06-30 Analog-to-digital converter

Country Status (1)

Country Link
JP (1) JPS5714264A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58154982A (en) * 1982-02-22 1983-09-14 アールシーエー　トムソン　ライセンシング　コーポレイシヨン Signal processing system
JPS59105791A (en) * 1982-11-23 1984-06-19 アールシーエー　トムソン　ライセンシング　コーポレーシヨン Digital television receiver
EP0178044A2 (en) * 1984-07-28 1986-04-16 Victor Company Of Japan, Limited Analogue-to-digital converting apparatus for video signals

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5166716A (en) * 1974-09-03 1976-06-09 Bausch & Lomb
JPS5289449A (en) * 1976-01-21 1977-07-27 Nec Corp Level adjusting device
JPS5374314A (en) * 1976-12-14 1978-07-01 Nec Corp Transmitting system for composite video signal

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5166716A (en) * 1974-09-03 1976-06-09 Bausch & Lomb
JPS5289449A (en) * 1976-01-21 1977-07-27 Nec Corp Level adjusting device
JPS5374314A (en) * 1976-12-14 1978-07-01 Nec Corp Transmitting system for composite video signal

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58154982A (en) * 1982-02-22 1983-09-14 アールシーエー　トムソン　ライセンシング　コーポレイシヨン Signal processing system
JPH0523108B2 (en) * 1982-02-22 1993-03-31 Aaru Shii Ee Tomuson Raisenshingu Corp
JPS59105791A (en) * 1982-11-23 1984-06-19 アールシーエー　トムソン　ライセンシング　コーポレーシヨン Digital television receiver
EP0178044A2 (en) * 1984-07-28 1986-04-16 Victor Company Of Japan, Limited Analogue-to-digital converting apparatus for video signals
EP0178044A3 (en) * 1984-07-28 1987-12-02 Victor Company Of Japan, Limited Analogue-to-digital converting apparatus for video signals

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