JPH0126233B2 - - Google Patents
Info
- Publication number
- JPH0126233B2 JPH0126233B2 JP57007857A JP785782A JPH0126233B2 JP H0126233 B2 JPH0126233 B2 JP H0126233B2 JP 57007857 A JP57007857 A JP 57007857A JP 785782 A JP785782 A JP 785782A JP H0126233 B2 JPH0126233 B2 JP H0126233B2
- Authority
- JP
- Japan
- Prior art keywords
- luminance component
- detection means
- circuit
- pickup
- frequency characteristic
- 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
Links
- 238000001514 detection method Methods 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims 1
- 239000003990 capacitor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/79—Processing of colour television signals in connection with recording
- H04N9/87—Regeneration of colour television signals
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Optical Recording Or Reproduction (AREA)
- Television Signal Processing For Recording (AREA)
Description
【発明の詳細な説明】
本発明は再生画像のノイズを視覚的に抑圧する
ビデオデイスクプレーヤの周波数特性調整回路に
関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a frequency characteristic adjustment circuit for a video disc player that visually suppresses noise in a reproduced image.
ビデオデイスクレコードは特殊再生を可能にす
るため、通常記録トラツク一周当り整数フレーム
分の映像信号をFM変調記録しており、当然のこ
と乍ら、内周部を再生する場合には、FM変調映
像信号の高域部分のレベルが低下すると共にSN
も劣化する。更に、この様な信号をFM復調した
映像信号は、その帯域全体にSNが劣化する。帯
域全体にSNが劣化した映像信号をモニタ画面に
映出する場合、輝度成分の高域を抑圧すると視覚
的にSNが改善される。 In order to enable special playback, video disc records normally record FM-modulated video signals for an integer number of frames per round of the recording track.Of course, when playing back the inner circumference, FM-modulated video As the level of the high frequency part of the signal decreases, the SN
also deteriorates. Furthermore, a video signal obtained by FM demodulating such a signal has degraded SN over its entire band. When displaying a video signal with degraded SN across the entire band on a monitor screen, suppressing the high range of the luminance component visually improves the SN.
そこで、本発明は上述する点に鑑み、デイスク
レコードの内周を再生する場合に、輝度成分の高
域を抑圧して再生画面のSNを視覚的に改善する
ビデオデイスクプレーヤの周波数特性調整回路を
提案せんとするものである。 Therefore, in view of the above-mentioned points, the present invention provides a frequency characteristic adjustment circuit for a video disc player that visually improves the SN of the playback screen by suppressing the high range of the luminance component when playing back the inner circumference of a disc record. This is what I would like to propose.
以下、本発明を図示する実施例に従い説明す
る。 The present invention will be described below with reference to illustrative embodiments.
まず、第１図に図示する実施例は、半導体レー
ザを用いる光学式ビデオデイスクプレーヤに本発
明を採用するものである。この半導体レーザを用
いるビデオデイスクプレーヤはレーザ光のスポツ
ト形状が楕円であり、然も波長が本来の波長より
長いため、特にSNの劣化が著しい。そこで、本
実施例では、第１図に図示する様に、ピツクアツ
プ出力をプリアンプ１にて増幅し、FM復調回路
２にて復調し、復調出力を同期分離回路や制御コ
ード読取回路やジツタ補正回路等を含む信号処理
回路３に入力した後、バンドパスフイルタ４とロ
ーパスフイルタ５を介してカラー成分Ｃと輝度成
分Ｙに分離し、輝度成分Ｙに付いては周波数特性
制御回路６によつて周波数特性を制御し、カラー
成分Ｃと共に混合回路８にて混合しており、前記
周波数特性制御回路６にはピツクアツプの再生位
置検出手段７の出力が入力され、内周部再生時に
輝度成分の高域を抑圧している。第２図と第３図
は、前記周波数特性制御回路と再生位置検出手段
７の具体的な回路構成を示す。 First, in the embodiment shown in FIG. 1, the present invention is applied to an optical video disk player using a semiconductor laser. In a video disk player using this semiconductor laser, the spot shape of the laser beam is elliptical, and the wavelength is longer than the original wavelength, so the deterioration of the SN is particularly significant. Therefore, in this embodiment, as shown in FIG. 1, the pickup output is amplified by a preamplifier 1, demodulated by an FM demodulation circuit 2, and the demodulated output is sent to a sync separation circuit, a control code reading circuit, and a jitter correction circuit. After inputting the signal to a signal processing circuit 3 including a band pass filter 4 and a low pass filter 5, it is separated into a color component C and a luminance component Y. The characteristics are controlled and mixed together with the color component C in a mixing circuit 8.The frequency characteristic control circuit 6 receives the output of the reproduction position detection means 7 of the pickup, and when reproducing the inner circumference, the high frequency component of the luminance component is mixed. is suppressed. 2 and 3 show specific circuit configurations of the frequency characteristic control circuit and reproduction position detection means 7. FIG.
第２図の実施例は、輝度成分をベース入力とす
るトランジスタQ1のエミツタ側に、コンデンサ
Ｃと可変抵抗VRの直列回路をエミツタ抵抗R1と
並列に接続し、前記トランジスタQ1のコレクタ
側より出力を導出するものである。本実施例の可
変抵抗VRは、再生位置検出手段を構成し、ピツ
クアツプの内周から外周への移動に伴い、ピツク
アツプに取付けた摺動子を抵抗面上に滑動せしめ
るものである。 In the embodiment shown in FIG. 2, a series circuit of a capacitor C and a variable resistor V R is connected in parallel with the emitter resistor R 1 to the emitter side of a transistor Q 1 whose base input is a luminance component, and the collector of the transistor Q 1 is connected in parallel to the emitter resistor R 1 . The output is derived from the side. The variable resistor V R of this embodiment constitutes a playback position detection means, and is used to cause a slider attached to the pickup to slide on the resistance surface as the pickup moves from the inner circumference to the outer circumference.
更に第３図の実施例は、コンデンサＣと抵抗
R2とスイツチングトランジスタQ2とを直列接続
してエミツタ抵抗R1に対し並列接続するもので
あり、再生位置検出手段は正電源と開閉スイツチ
Ｓによつて構成される。即ち、本実施例は大体内
周より5000フレーム（周）位の範囲で周波数特性
を制御すれば良いことに鑑み、ピツクアツプが内
周より5000フレームを再生する期間中ピツクアツ
プの移動を利用して前記開閉スイツチＳを閉路す
ることにより前記スイツチングトランジスタQ2
を導通せしめて輝度成分の高域を抑圧するもので
ある。 Furthermore, the embodiment of Fig. 3 has a capacitor C and a resistor.
R2 and a switching transistor Q2 are connected in series and connected in parallel to the emitter resistor R1 , and the reproduction position detection means is constituted by a positive power supply and an on/off switch S. That is, in this embodiment, considering that it is sufficient to control the frequency characteristics within a range of about 5000 frames (circumference) from the inner circumference, the above-described control is performed by using the movement of the pick-up during the period in which the pick-up reproduces 5000 frames from the inner circumference. By closing the on/off switch S, the switching transistor Q 2
conducts to suppress the high range of the luminance component.
上述せる如く、本発明によれば、輝度成分の周
波数特性を制御するだけで、再生画面のノイズを
視覚的に軽減でき、その効果は大である。 As described above, according to the present invention, noise on the reproduced screen can be visually reduced simply by controlling the frequency characteristics of the luminance component, and the effect is significant.
第１図は本発明の一実施例に係るビデオデイス
クプレーヤの再生回路ブロツク図、第２図及び第
３図は異なる実施例を示す要部回路図を、それぞ
れ顕わす。
主な図番の説明、６……周波数特性制御回路、
７……再生位置検出手段。
FIG. 1 is a block diagram of a playback circuit of a video disk player according to an embodiment of the present invention, and FIGS. 2 and 3 are circuit diagrams of main parts showing different embodiments. Explanation of main figure numbers, 6... Frequency characteristic control circuit,
7...Reproduction position detection means.
Claims (1)
トラツクをピツクアツプにて走査してFM変調映
像信号を再生するビデオデイスクプレーヤに於
て、 前記デイスクレコードに対する前記ピツクアツ
プの再生位置を検出する再生位置検出手段と、 該検出手段の出力に応じ、復調した映像信号の
輝度成分の高域利得を制御する周波数特性制御回
路とを、 それぞれ配し、前記デイスクレコードの内周部
を再生するとき前記輝度成分の高域を抑圧するこ
とを特徴とするビデオデイスクプレーヤの周波数
特性調整回路。[Claims] 1. In a video disc player that plays back an FM modulated video signal by scanning a recording track of a disk record rotating at a constant angular velocity with a pickup, detecting the playback position of the pickup with respect to the disk record. A reproduction position detection means and a frequency characteristic control circuit for controlling the high-frequency gain of the luminance component of the demodulated video signal according to the output of the detection means are respectively disposed, and when the inner peripheral part of the disc record is reproduced. A frequency characteristic adjustment circuit for a video disc player, characterized in that the high frequency range of the luminance component is suppressed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57007857A JPS58124384A (en) | 1982-01-20 | 1982-01-20 | Frequency characteristic adjusting circuit for video disc player |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57007857A JPS58124384A (en) | 1982-01-20 | 1982-01-20 | Frequency characteristic adjusting circuit for video disc player |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58124384A JPS58124384A (en) | 1983-07-23 |
| JPH0126233B2 true JPH0126233B2 (en) | 1989-05-23 |
Family
ID=11677305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57007857A Granted JPS58124384A (en) | 1982-01-20 | 1982-01-20 | Frequency characteristic adjusting circuit for video disc player |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58124384A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6066173U (en) * | 1983-10-13 | 1985-05-10 | ソニー株式会社 | Video tape recorder noise canceller |
| JPH01205728A (en) * | 1988-02-12 | 1989-08-18 | Hitachi Maxell Ltd | Optical disk device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5057714A (en) * | 1973-09-21 | 1975-05-20 | ||
| JPS5066216A (en) * | 1973-10-11 | 1975-06-04 | ||
| JPS5422120A (en) * | 1977-07-20 | 1979-02-19 | Sony Corp | Gain compensating circuit for signal reproducer |
-
1982
- 1982-01-20 JP JP57007857A patent/JPS58124384A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5057714A (en) * | 1973-09-21 | 1975-05-20 | ||
| JPS5066216A (en) * | 1973-10-11 | 1975-06-04 | ||
| JPS5422120A (en) * | 1977-07-20 | 1979-02-19 | Sony Corp | Gain compensating circuit for signal reproducer |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58124384A (en) | 1983-07-23 |
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