JPS5952774U - automatic gain control circuit - Google Patents
automatic gain control circuitInfo
- Publication number
- JPS5952774U JPS5952774U JP14630982U JP14630982U JPS5952774U JP S5952774 U JPS5952774 U JP S5952774U JP 14630982 U JP14630982 U JP 14630982U JP 14630982 U JP14630982 U JP 14630982U JP S5952774 U JPS5952774 U JP S5952774U
- Authority
- JP
- Japan
- Prior art keywords
- gain control
- automatic gain
- control circuit
- diode
- voltage
- 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
Landscapes
- Television Receiver Circuits (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は正極性変調されたテレビジョン信号の波形図、
第・２図は従来の平均値型ＡＧＣ回路を示す回路図、第
３図ａ、 ｂは復調部の出力波形を示し、ａは平均変
調度の低い場合の波形図、ｂは平均変調度の高い場合の
波形図、第４図は本考案に係る平均値型ＡＧＣ回路を示
す回路図、第５図ａ。
ｂは第４図の動作説明図であり、ａは復調部の出力波形
を示す波形図、ｂはＡＧＣ回路の出力波形を示す波形図
である。
３・・・中間周波増幅部、４・・・復調部、６・・・Ａ
ＧＣ増幅部、７・・・ＡＧＣ回路、Ｄ・・・ダイオード
、Ｒ１・・・抵抗、Ｃ・・・コンデンサ、■ＣＣ・・・
直流電源、■亡・復調部用力、■２・・・ＡＧＣ回路出
力。Figure 1 is a waveform diagram of a positive polarity modulated television signal.
Figure 2 is a circuit diagram showing a conventional average value type AGC circuit, Figures 3a and 3b show the output waveforms of the demodulator, where a is a waveform diagram when the average modulation degree is low, and b is a waveform diagram when the average modulation degree is low. FIG. 4 is a waveform diagram in the case of high voltage, and FIG. 5a is a circuit diagram showing an average value type AGC circuit according to the present invention. b is an explanatory diagram of the operation of FIG. 4, a is a waveform diagram showing the output waveform of the demodulator, and b is a waveform diagram showing the output waveform of the AGC circuit. 3...Intermediate frequency amplification section, 4...Demodulation section, 6...A
GC amplifier section, 7...AGC circuit, D...diode, R1...resistor, C...capacitor, ■CC...
DC power supply, ■Demodulator power, ■2...AGC circuit output.
Claims (1)
利得制御用電圧として用いる平均値型自動利得制御回路
において、前記復調部の出力端にダイオードを逆方向接
続しそのアノードにコンデンサ及び、抵抗の各一端を接
続し、前記コンデンサの他端を接地し、前記抵抗の他端
を直流電源に接続した回路を構成し、前記ダイオードの
アノードから自動利得制御用直流電圧を得ることを特徴
とする自動利得制御回路。In an average value type automatic gain control circuit that uses the average DC voltage of the demodulator of a television receiver as the voltage for automatic gain control, a diode is connected in the reverse direction to the output terminal of the demodulator, and a capacitor and a resistor are connected to the anode of the diode. A circuit is formed by connecting one end of each of the capacitors, grounding the other end of the capacitor, and connecting the other end of the resistor to a DC power supply, and obtaining a DC voltage for automatic gain control from the anode of the diode. Gain control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14630982U JPS5952774U (en) | 1982-09-29 | 1982-09-29 | automatic gain control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14630982U JPS5952774U (en) | 1982-09-29 | 1982-09-29 | automatic gain control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5952774U true JPS5952774U (en) | 1984-04-06 |
Family
ID=30325702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14630982U Pending JPS5952774U (en) | 1982-09-29 | 1982-09-29 | automatic gain control circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5952774U (en) |
-
1982
- 1982-09-29 JP JP14630982U patent/JPS5952774U/en active Pending
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