JPH0412075B2 - - Google Patents
Info
- Publication number
- JPH0412075B2 JPH0412075B2 JP57022333A JP2233382A JPH0412075B2 JP H0412075 B2 JPH0412075 B2 JP H0412075B2 JP 57022333 A JP57022333 A JP 57022333A JP 2233382 A JP2233382 A JP 2233382A JP H0412075 B2 JPH0412075 B2 JP H0412075B2
- Authority
- JP
- Japan
- Prior art keywords
- image quality
- vertical synchronization
- playback
- video tape
- synchronization 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.)
- Expired - Lifetime
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
- H04N5/93—Regeneration of the television signal or of selected parts thereof
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Television Signal Processing For Recording (AREA)
- Picture Signal Circuits (AREA)
Description
【発明の詳細な説明】
本発明は、ビデオテープレコーダを特殊再生
（スロー再生）して受像する場合における画質の
劣化を自動的に補正することのできる画質調整装
置を提供しようとするものである。DETAILED DESCRIPTION OF THE INVENTION The present invention seeks to provide an image quality adjustment device that can automatically correct deterioration in image quality when receiving images by performing special playback (slow playback) on a video tape recorder. .
テレビジヨン受像機にビデオテープレコーダを
接続して通常の再生を行なつている場合は問題な
いが、たとえば通常のスピードより速いスピード
で再生を行つたり、あるいは静止画として再生し
たり、またスロー再生等の特殊再生を行つた場合
には画質が劣化し、これを補正するため手動にて
画質制御用可変抵抗器を調整すればよいが、操作
が煩しいといつた問題がある。 There is no problem if you connect a video tape recorder to a television receiver and perform normal playback, but for example, if you play back at a faster speed than normal, or play back as still images, or play back in slow motion. When performing special playback such as playback, the image quality deteriorates, and in order to correct this, the image quality control variable resistor may be manually adjusted, but there is a problem that the operation is cumbersome.
本発明は上記点に鑑みてなされたもので、特殊
再生（スロー再生）時に生じる特殊再生信号であ
る擬以垂直同期信号を利用し、これを検出するこ
とによつて画質（シヤープネス）を自動的に調整
するものである。 The present invention has been made in view of the above points, and automatically adjusts image quality (sharpness) by using a false vertical synchronization signal, which is a special playback signal that occurs during special playback (slow playback), and by detecting this signal. It is to be adjusted to.
以下その一実施例を添付図面を用いて説明す
る。第１図において、映像検波出力信号は同期分
離回路１に入り、ここで同期信号が分離され、さ
らに次の抵抗２およびコンデンサ３からなる積分
回路によつて垂直同期信号のみが積分され、次の
垂直発振回路４を駆動している。ビデオテープレ
コーダを通常の速度で再生する場合、第２図ａに
示すように映像検波出力信号中の垂直同期信号
V.SYNCのパルス幅は3Hであり、積分後の垂直
同期信号（第１図Ａ点の信号）のレベルも第２図
ｂに示すように小さい。一方、特殊再生（スロー
再生）時には第３図に示すように垂直同期信号
V.SYNCのパルス幅は６〜10Hと広くなる。これ
は擬似垂直同期信号と言われるもので、ビデオテ
ープレコーダではスロー再生時、この信号を利用
して再生を行つている。そのため、積分後の垂直
同期信号のレベルも第３図ｂに示すように通常再
生時の場合にくらべて大きくなる。 One embodiment will be described below with reference to the accompanying drawings. In Fig. 1, the video detection output signal enters the sync separation circuit 1, where the sync signal is separated, and then only the vertical sync signal is integrated by the next integrating circuit consisting of a resistor 2 and a capacitor 3. It drives the vertical oscillation circuit 4. When playing back a video tape recorder at normal speed, the vertical synchronization signal in the video detection output signal is
The pulse width of V.SYNC is 3H, and the level of the vertical synchronization signal (signal at point A in FIG. 1) after integration is also small as shown in FIG. 2b. On the other hand, during special playback (slow playback), the vertical synchronization signal is
The pulse width of V.SYNC is wide, 6 to 10H. This is called a pseudo vertical synchronization signal, and video tape recorders use this signal during slow playback. Therefore, the level of the vertical synchronizing signal after integration also becomes higher than that during normal reproduction, as shown in FIG. 3b.
本発明においては、この積分後の垂直同期信号
のレベルが通常再生の場合とスロー再生の場合と
で大きく異なることに鑑み、この積分回路に特殊
再生信号検出回路５を接続し、特殊再生信号（第
３図）のみこの回路５で検出し、この検出出力に
よつて画質制御回路６を自動的にコントロールし
て画像の劣化を防止する、すなわちシヤープネス
を高めることができるものである。 In the present invention, in view of the fact that the level of the vertical synchronization signal after this integration differs greatly between normal playback and slow playback, a special playback signal detection circuit 5 is connected to this integration circuit, and the special playback signal ( 3) is detected by this circuit 5, and the image quality control circuit 6 is automatically controlled based on the detection output to prevent image deterioration, that is, to increase sharpness.
以上説明したように、本発明によれば、ビデオ
テープレコーダのスロー再生時、特有に出力され
るパルス幅の広い擬似垂直同期信号を検出して画
質を自動的にコントロールすることにより、あら
ためて手動にて調整を行うことなく、常にすぐれ
た画質の画像を得ることができる。 As explained above, according to the present invention, by detecting the pseudo vertical synchronization signal with a wide pulse width that is uniquely output during slow playback of a video tape recorder and automatically controlling the image quality, it is possible to manually control the image quality again. You can always obtain images of excellent quality without having to make any adjustments.
第１図は本発明の一実施例における画質調整装
置の回路図、第２図、第３図は本発明の動作説明
のための波形図である。
１……同期分離回路、２，３……積分回路を構
成する抵抗、コンデンサ、５……特殊再生信号検
出回路、６……画質制御回路。
FIG. 1 is a circuit diagram of an image quality adjustment device according to an embodiment of the present invention, and FIGS. 2 and 3 are waveform diagrams for explaining the operation of the present invention. 1... Synchronization separation circuit, 2, 3... Resistor and capacitor forming an integrating circuit, 5... Special reproduction signal detection circuit, 6... Image quality control circuit.
Claims (1)
像検波出力信号より垂直同期信号を分離する同期
分離回路と、ビデオテープレコーダの通常再生
時、得られる垂直同期信号のパルス幅より、ビデ
オテープレコーダのスロー再生時得られるパルス
幅の広い疑似垂直同期信号を積分回路を用いて検
出する検出手段を設け、上記擬似垂直同期信号を
検出したとき得られる上記検出手段の出力信号に
よつてテレビジヨン受像機の画質を自動的に制御
するようにした画質調整装置。1 A synchronization separation circuit that separates the vertical synchronization signal from the video detection output signal obtained by playing back the video tape recorder, and a slow playback of the video tape recorder based on the pulse width of the vertical synchronization signal obtained during normal playback of the video tape recorder. The image quality of the television receiver is determined by the output signal of the detection means obtained when the pseudo vertical synchronization signal is detected. An image quality adjustment device that automatically controls the
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57022333A JPS58139578A (en) | 1982-02-15 | 1982-02-15 | Picture quality controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57022333A JPS58139578A (en) | 1982-02-15 | 1982-02-15 | Picture quality controller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58139578A JPS58139578A (en) | 1983-08-18 |
| JPH0412075B2 true JPH0412075B2 (en) | 1992-03-03 |
Family
ID=12079776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57022333A Granted JPS58139578A (en) | 1982-02-15 | 1982-02-15 | Picture quality controller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58139578A (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5658384A (en) * | 1979-10-18 | 1981-05-21 | Sony Corp | Video tape recorder |
-
1982
- 1982-02-15 JP JP57022333A patent/JPS58139578A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58139578A (en) | 1983-08-18 |
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