JPS55135408A - Integrated circuit for pre-emphasis - Google Patents

Integrated circuit for pre-emphasis

Info

Publication number
JPS55135408A
JPS55135408A JP4298779A JP4298779A JPS55135408A JP S55135408 A JPS55135408 A JP S55135408A JP 4298779 A JP4298779 A JP 4298779A JP 4298779 A JP4298779 A JP 4298779A JP S55135408 A JPS55135408 A JP S55135408A
Authority
JP
Japan
Prior art keywords
circuit
terminal
emphasis
feedback circuit
recording
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
JP4298779A
Other languages
Japanese (ja)
Other versions
JPS6258169B2 (en
Inventor
Kazuo Kondo
Akira Shibata
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 JP4298779A priority Critical patent/JPS55135408A/en
Publication of JPS55135408A publication Critical patent/JPS55135408A/en
Publication of JPS6258169B2 publication Critical patent/JPS6258169B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G5/00—Tone control or bandwidth control in amplifiers

Abstract

PURPOSE:To decrease the difference of the frequency deviation quantity for the pre- emphasis integrated circuit used for recording of the luminance signal of the VTR, by forming the emphasis circuit with the differntial amplifier and the negative feedback circuit and then switching the frequency property of the negative feedback circuit via the switch. CONSTITUTION:The input signal is supplied through terminal 41 and then delivered to terminal 43 via amplifier 42. For the SP (standard time pictre recording/ reproduction), terminal 66 is set at a low potential with use of only feedback circuit 44. In the case of the LP (long time picture recording/reproduction), terminal 66 is set at a high potential. And transistors 56 and 59 of the switch circuit are turned on, and circuit 44 is used along with feedback circuit 45 which varies its feedback factor according to the signal level. Thus the same amplifier is used for both the SP and LP, accordingly the difference can be reduced for the freqency deviation quantity. Furthermore, the number can be reduced as well for the peripheral parts and terminal pins when the integration is given.
JP4298779A 1979-04-11 1979-04-11 Integrated circuit for pre-emphasis Granted JPS55135408A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4298779A JPS55135408A (en) 1979-04-11 1979-04-11 Integrated circuit for pre-emphasis

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4298779A JPS55135408A (en) 1979-04-11 1979-04-11 Integrated circuit for pre-emphasis

Publications (2)

Publication Number Publication Date
JPS55135408A true JPS55135408A (en) 1980-10-22
JPS6258169B2 JPS6258169B2 (en) 1987-12-04

Family

ID=12651376

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4298779A Granted JPS55135408A (en) 1979-04-11 1979-04-11 Integrated circuit for pre-emphasis

Country Status (1)

Country Link
JP (1) JPS55135408A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5791320U (en) * 1980-11-26 1982-06-05
JPS6096909A (en) * 1983-10-31 1985-05-30 Sony Corp Pre-emphasis circuit
US5436729A (en) * 1991-11-27 1995-07-25 Hitachi, Ltd. Video signal processing apparatus with automatic picture quality control function and signal processing circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5791320U (en) * 1980-11-26 1982-06-05
JPS6096909A (en) * 1983-10-31 1985-05-30 Sony Corp Pre-emphasis circuit
US5436729A (en) * 1991-11-27 1995-07-25 Hitachi, Ltd. Video signal processing apparatus with automatic picture quality control function and signal processing circuit

Also Published As

Publication number Publication date
JPS6258169B2 (en) 1987-12-04

Similar Documents

Publication Publication Date Title
AU583825B2 (en) An apparatus for recording a color video signal
JPS55135408A (en) Integrated circuit for pre-emphasis
JPS5262067A (en) Current square-law circuit
JPS5621419A (en) Logical operation circuit
JPS5689108A (en) Bias setting circuit of push-pull amplifier
JPS57138009A (en) Magnetic recorder and reproducer
JPS5746508A (en) Muting amplifier
JPS56109009A (en) Amplifying circuit
JPS5635586A (en) Burst gate amplifying circuit
JPS5715578A (en) Carrier wave pickup circut
KR850001849Y1 (en) Singnal matching circuit
GB1487254A (en) Amplifier arrangements with a plurality of negative feedback circuits
JPS579134A (en) Logical circuit
JPS51113702A (en) Reverberation adder
JPS561621A (en) Signal switching circuit
JPS57152762A (en) Dc constant current supplying circuit with unsaturated current inverting function
JPS5468601A (en) Muting circuit
JPS5548806A (en) Magnetic recording and reproducing unit
JPS5635515A (en) Automatic gain control amplifier
JPS5568708A (en) Signal amplifier circuit
JPS5711505A (en) Frequency multiplying circuit
ES450906A1 (en) Improvements in television receivers. (Machine-translation by Google Translate, not legally binding)
JPS5251851A (en) Ringing deletion circuit
JPS55140310A (en) Voltage follower circuit
JPS5797226A (en) Signal switching circuit