JPS56160119A - Equalizing circuit of level ratio between video and voice - Google Patents
Equalizing circuit of level ratio between video and voiceInfo
- Publication number
- JPS56160119A JPS56160119A JP6279980A JP6279980A JPS56160119A JP S56160119 A JPS56160119 A JP S56160119A JP 6279980 A JP6279980 A JP 6279980A JP 6279980 A JP6279980 A JP 6279980A JP S56160119 A JPS56160119 A JP S56160119A
- Authority
- JP
- Japan
- Prior art keywords
- component
- voice
- amplifier
- double
- level ratio
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Details Of Television Systems (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
PURPOSE:To ensure a simple equalization for the level ratio between a video signal and a voice signal, by extracting the double wave AC component out of the output of a variable tilt amplifier and comparing this component with the reference voltage to control the variable tilt amplifier. CONSTITUTION:When the image/voice double carrier signal is applied to an input terminal 10, the double wave differential AC component emerges at a resistance R1 end by giving a wave detection to the double waveheight frequency signal of a variable tilt amplifier 7 through a diode D1. The amplitude value of the double wave differential AC component varies by the level difference between a video signal and a voice signal. Based on the difference of the AC component, a capacitor C2 is charged. And the difference of AC component is converted into a DC component to be applied to a differential amplifier 6. In such way, the level ratio can be fixed at a certain value that is decided by a reference voltage 5 of the differential amplifier 6 for the video signal obtained through an output terminal 11 although some fluctuation is caused at the input terminal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6279980A JPS56160119A (en) | 1980-05-14 | 1980-05-14 | Equalizing circuit of level ratio between video and voice |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6279980A JPS56160119A (en) | 1980-05-14 | 1980-05-14 | Equalizing circuit of level ratio between video and voice |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS56160119A true JPS56160119A (en) | 1981-12-09 |
JPS6367395B2 JPS6367395B2 (en) | 1988-12-26 |
Family
ID=13210748
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6279980A Granted JPS56160119A (en) | 1980-05-14 | 1980-05-14 | Equalizing circuit of level ratio between video and voice |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56160119A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05502939A (en) * | 1989-10-04 | 1993-05-20 | アガール・コーポレーション・インコーポレーテッド | concentration measuring device |
-
1980
- 1980-05-14 JP JP6279980A patent/JPS56160119A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05502939A (en) * | 1989-10-04 | 1993-05-20 | アガール・コーポレーション・インコーポレーテッド | concentration measuring device |
Also Published As
Publication number | Publication date |
---|---|
JPS6367395B2 (en) | 1988-12-26 |
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