JPS57154986A - Magnetic recorder and reproducer - Google Patents

Magnetic recorder and reproducer

Info

Publication number
JPS57154986A
JPS57154986A JP56041209A JP4120981A JPS57154986A JP S57154986 A JPS57154986 A JP S57154986A JP 56041209 A JP56041209 A JP 56041209A JP 4120981 A JP4120981 A JP 4120981A JP S57154986 A JPS57154986 A JP S57154986A
Authority
JP
Japan
Prior art keywords
emphasis
low
frequency
band regions
nonlinear
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
JP56041209A
Other languages
Japanese (ja)
Inventor
Yoshitsugu Shibuya
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 JP56041209A priority Critical patent/JPS57154986A/en
Publication of JPS57154986A publication Critical patent/JPS57154986A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/92—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N5/923—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback using preemphasis of the signal before modulation and deemphasis of the signal after demodulation

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Signal Processing For Recording (AREA)

Abstract

PURPOSE:To enhance the S/N without lowering the picture quality due to the smear, by dividing the frequency of a luminance signal to receive a modulation of frequency into the low and middle band regions and carrying out the fixed emphasis at the high and low band regions and the nonlinear emphasis carried at the middle band region respectively. CONSTITUTION:When the frequency of a luminance signal to be emphasized is divided into the low, middle and high band regions, the fixed emphasis is carried out at the low and high band regions. The frequency characteristics are set to have corner time constants T1, T2, T5 and T6 respectively. The nonlinear emphasis is carried out at the middle band region. The nonlinear emphasis is formed by the combination of resistances R1 and R2, capacitors C1 and C2 plus diodes D1 and D2 which are obtained by deforming the fixed emphasis.
JP56041209A 1981-03-19 1981-03-19 Magnetic recorder and reproducer Pending JPS57154986A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56041209A JPS57154986A (en) 1981-03-19 1981-03-19 Magnetic recorder and reproducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56041209A JPS57154986A (en) 1981-03-19 1981-03-19 Magnetic recorder and reproducer

Publications (1)

Publication Number Publication Date
JPS57154986A true JPS57154986A (en) 1982-09-24

Family

ID=12602009

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56041209A Pending JPS57154986A (en) 1981-03-19 1981-03-19 Magnetic recorder and reproducer

Country Status (1)

Country Link
JP (1) JPS57154986A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4860105A (en) * 1987-05-22 1989-08-22 Victor Company Of Japan, Ltd. Noise Reducing circuit of a video signal

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53106106A (en) * 1977-02-28 1978-09-14 Sony Corp Signal transmitting system
JPS54145111A (en) * 1978-05-02 1979-11-13 Sony Corp Video signal recorder-reproducer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53106106A (en) * 1977-02-28 1978-09-14 Sony Corp Signal transmitting system
JPS54145111A (en) * 1978-05-02 1979-11-13 Sony Corp Video signal recorder-reproducer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4860105A (en) * 1987-05-22 1989-08-22 Victor Company Of Japan, Ltd. Noise Reducing circuit of a video signal

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