JPS5750191A - Phase synchronism type demodulation circuit - Google Patents

Phase synchronism type demodulation circuit

Info

Publication number
JPS5750191A
JPS5750191A JP12565480A JP12565480A JPS5750191A JP S5750191 A JPS5750191 A JP S5750191A JP 12565480 A JP12565480 A JP 12565480A JP 12565480 A JP12565480 A JP 12565480A JP S5750191 A JPS5750191 A JP S5750191A
Authority
JP
Japan
Prior art keywords
collector
potential
trs
point
signal
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
JP12565480A
Other languages
Japanese (ja)
Other versions
JPS6355241B2 (en
Inventor
Nobukazu Hosoya
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.)
Sanyo Electric Co Ltd
Sanyo Denki Co Ltd
Original Assignee
Sanyo Electric Co Ltd
Sanyo Denki 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 Sanyo Electric Co Ltd, Sanyo Denki Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP12565480A priority Critical patent/JPS5750191A/en
Publication of JPS5750191A publication Critical patent/JPS5750191A/en
Publication of JPS6355241B2 publication Critical patent/JPS6355241B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/66—Circuits for processing colour signals for synchronous demodulators

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

PURPOSE:To avoid the saturation of a demodulation transistor (TR) even if the amplitude of signal is greater, by providing a means clamping the collector potential of the upper stage TR at about the base potential producing an output at the collector. CONSTITUTION:In a demodulation circuit 1 for B-Y, a chrominance signal is in- 1/2 phase to the collector of a TR104 and in opposite phase to the collector of a TR105. In TRs 100, 101, 102, 103 of the upper stage differential pairs, the phase synchronizing detection between the chrominance signal and chrominance subcarrier wave is made, and an output with negative polarity is produced at a point (b) in common connection of the collectors of the TRs 100, 102 and an output with positive polarity is produced at a point (c). When the amplitude of signal is increased and the potential at the point (b) comes near the base potential of the TRs 100, 102, a TR115 turns on and the potential of the point (b) is clamped near the base potential. Thus, between the base and collector of the TRs 100, 102, are not forward biased and demodulated outputs 4, 5 are accurate.
JP12565480A 1980-09-09 1980-09-09 Phase synchronism type demodulation circuit Granted JPS5750191A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12565480A JPS5750191A (en) 1980-09-09 1980-09-09 Phase synchronism type demodulation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12565480A JPS5750191A (en) 1980-09-09 1980-09-09 Phase synchronism type demodulation circuit

Publications (2)

Publication Number Publication Date
JPS5750191A true JPS5750191A (en) 1982-03-24
JPS6355241B2 JPS6355241B2 (en) 1988-11-01

Family

ID=14915355

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12565480A Granted JPS5750191A (en) 1980-09-09 1980-09-09 Phase synchronism type demodulation circuit

Country Status (1)

Country Link
JP (1) JPS5750191A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6239235A (en) * 1985-08-14 1987-02-20 松下電工株式会社 Manufacture of sound-absorbing board
JPS6239233A (en) * 1985-08-14 1987-02-20 松下電工株式会社 Manufacture of rock wool sound-absorbing board
JPS6398440A (en) * 1986-10-15 1988-04-28 日本製紙株式会社 Manufacture of reinforced woody decorative material

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4983945U (en) * 1972-11-08 1974-07-20
JPS50129120A (en) * 1974-03-30 1975-10-13

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4983945U (en) * 1972-11-08 1974-07-20
JPS50129120A (en) * 1974-03-30 1975-10-13

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6239235A (en) * 1985-08-14 1987-02-20 松下電工株式会社 Manufacture of sound-absorbing board
JPS6239233A (en) * 1985-08-14 1987-02-20 松下電工株式会社 Manufacture of rock wool sound-absorbing board
JPS6398440A (en) * 1986-10-15 1988-04-28 日本製紙株式会社 Manufacture of reinforced woody decorative material

Also Published As

Publication number Publication date
JPS6355241B2 (en) 1988-11-01

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