JPS6217290U - - Google Patents
Info
- Publication number
- JPS6217290U JPS6217290U JP10849085U JP10849085U JPS6217290U JP S6217290 U JPS6217290 U JP S6217290U JP 10849085 U JP10849085 U JP 10849085U JP 10849085 U JP10849085 U JP 10849085U JP S6217290 U JPS6217290 U JP S6217290U
- Authority
- JP
- Japan
- Prior art keywords
- constant current
- generates
- current source
- capacitor
- switching
- 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
Links
- 239000003990 capacitor Substances 0.000 claims description 4
- 230000003213 activating effect Effects 0.000 claims 1
- 238000007599 discharging Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Processing Of Color Television Signals (AREA)
Description
第１図は本考案の一実施例を示す回路図、第２
図は第１図図示回路の動作説明用信号波形図、第
３図は従来の特殊効果増幅器の一例を示すブロツ
ク系統図である。
７…方形波入力端子、８…キーイング信号出力
端子、Ｑ１，Ｑ２…定電流源用ＰＮＰトランジス
タ、Ｑ３，Ｑ４…定電流源用ＮＰＮトランジスタ
、Ｑ５…スイツチング用ＮＰＮトランジスタ、Ｒ
１，Ｒ２…抵抗、Ｃ…コンデンサ。
Figure 1 is a circuit diagram showing one embodiment of the present invention;
1 is a signal waveform diagram for explaining the operation of the circuit shown in FIG. 1, and FIG. 3 is a block system diagram showing an example of a conventional special effect amplifier. 7...Square wave input terminal, 8...Keying signal output terminal, Q1 , Q2 ...PNP transistor for constant current source, Q3 , Q4 ...NPN transistor for constant current source, Q5 ...NPN transistor for switching, R
1 , R2 ...resistance, C...capacitor.
Claims (1)
て出力すると共に、その切替時点の前後のわずか
の期間該２以上の映像信号の混合信号を出力する
ためのソフトキーイング信号を発生する発生器に
おいて、第１の定電流を発生する第１の定電流源
と、該第１の定電流の２倍の値の第２の定電流を
発生する第２の定電流源と、該第１の定電流が常
時供給されるコンデンサと、該２以上の映像信号
の切替時点に応じて立上り又は立下るパルスによ
つてスイツチング制御され前記第１の映像信号切
替出力期間のみ該第２の定電流源を動作せしめて
該コンデンサを放電させる制御手段とよりなり、
該コンデンサの端子電圧をソフトキーイング信号
として出力するよう構成したソフトキーイング信
号発生器。 In a generator that switches and outputs one of two or more video signals and generates a soft keying signal for outputting a mixed signal of the two or more video signals for a short period before and after the switching point. , a first constant current source that generates a first constant current, a second constant current source that generates a second constant current that is twice the value of the first constant current, and a second constant current source that generates a second constant current that is twice the value of the first constant current. Switching is controlled by a capacitor to which current is constantly supplied and a pulse that rises or falls depending on the switching time of the two or more video signals, and the second constant current source is operated only during the first video signal switching output period. a control means for activating and discharging the capacitor;
A soft keying signal generator configured to output the terminal voltage of the capacitor as a soft keying signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10849085U JPS6217290U (en) | 1985-07-16 | 1985-07-16 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10849085U JPS6217290U (en) | 1985-07-16 | 1985-07-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6217290U true JPS6217290U (en) | 1987-02-02 |
Family
ID=30985734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10849085U Pending JPS6217290U (en) | 1985-07-16 | 1985-07-16 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6217290U (en) |
-
1985
- 1985-07-16 JP JP10849085U patent/JPS6217290U/ja active Pending