JPH01113473U - - Google Patents
Info
- Publication number
- JPH01113473U JPH01113473U JP16243988U JP16243988U JPH01113473U JP H01113473 U JPH01113473 U JP H01113473U JP 16243988 U JP16243988 U JP 16243988U JP 16243988 U JP16243988 U JP 16243988U JP H01113473 U JPH01113473 U JP H01113473U
- Authority
- JP
- Japan
- Prior art keywords
- capacitor
- resistor
- video signal
- grounded emitter
- series
- 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 4
- 238000001514 detection method Methods 0.000 claims 2
- 230000004069 differentiation Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 7
- 230000001052 transient effect Effects 0.000 description 2
Landscapes
- Television Receiver Circuits (AREA)
- Control Of Amplification And Gain Control (AREA)
Description
第１図は従来のＡＧＣ回路を示す回路図、第２
図Ａ，Ｂは第１図の過渡応答波形図、第３図Ａ，
Ｂは第１図の付加垂直パルス応答波形図、第４図
は本考案の実施例を示す回路図、第５図Ａ，Ｂは
第４図の過渡応答波形図、第６図Ａ，Ｂは第４図
の付加垂直パルス応答波形図である。
６……キヤパシタ、７……抵抗。
Figure 1 is a circuit diagram showing a conventional AGC circuit, Figure 2 is a circuit diagram showing a conventional AGC circuit.
Figures A and B are transient response waveform diagrams of Figure 1, Figure 3 A,
B is an additional vertical pulse response waveform diagram of FIG. 1, FIG. 4 is a circuit diagram showing an embodiment of the present invention, FIGS. 5A and B are transient response waveform diagrams of FIG. 4, and FIGS. 6A and B are FIG. 5 is an additional vertical pulse response waveform diagram of FIG. 4; 6... Capacity, 7... Resistance.
Claims (1)
ツタ接地増幅回路と、一端を該エミツタ接地増幅
回路に接続されたＡＧＣ検波用ダイオードと、該
ＡＧＣ検波用ダイオードの他端に接続されたキヤ
パシタと、該キヤパシタに直列に接続された抵抗
を備え、該キヤパシタのキヤパシタ値と該抵抗の
抵抗値の積によつて決定される時定数が略２７μ
ｓに設定され、該キヤパシタと該抵抗の直列回路
の両端に該映像信号の同期先頭レベルに応じた電
圧が検出される事を特徴とするＡＧＣ回路。 a grounded emitter amplifier circuit including a partial differentiation circuit and into which a video signal is input; an AGC detection diode with one end connected to the grounded emitter amplifier circuit; a capacitor connected to the other end of the AGC detection diode; A resistor is connected in series to a capacitor, and the time constant determined by the product of the capacitance value of the capacitor and the resistance value of the resistor is approximately 27μ.
s, and a voltage corresponding to a synchronization head level of the video signal is detected across a series circuit of the capacitor and the resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16243988U JPH01113473U (en) | 1988-12-16 | 1988-12-16 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16243988U JPH01113473U (en) | 1988-12-16 | 1988-12-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01113473U true JPH01113473U (en) | 1989-07-31 |
Family
ID=31446267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16243988U Pending JPH01113473U (en) | 1988-12-16 | 1988-12-16 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01113473U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4521787Y1 (en) * | 1967-06-28 | 1970-08-29 | ||
| JPS4875208A (en) * | 1972-01-11 | 1973-10-11 |
-
1988
- 1988-12-16 JP JP16243988U patent/JPH01113473U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4521787Y1 (en) * | 1967-06-28 | 1970-08-29 | ||
| JPS4875208A (en) * | 1972-01-11 | 1973-10-11 |