JPS5545251A - Filter circuit - Google Patents
Filter circuitInfo
- Publication number
- JPS5545251A JPS5545251A JP11842678A JP11842678A JPS5545251A JP S5545251 A JPS5545251 A JP S5545251A JP 11842678 A JP11842678 A JP 11842678A JP 11842678 A JP11842678 A JP 11842678A JP S5545251 A JPS5545251 A JP S5545251A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- iin
- color
- feedback
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H15/00—Transversal filters
Landscapes
- Processing Of Color Television Signals (AREA)
Abstract
PURPOSE:To make it possible to improve the color S/N of a large-area part without lowering vertical sharpness by providing a substractor circuit, a compression circuit and an adder circuit in the feedback-type comb line filter. CONSTITUTION:Color input signal Iin of the NTSC system obtained from the pickup tube of the single carrier frequency separation system is inputted to adder circuit 1, and the output is delayed by one horizontal period delay circuit 2 and is inputted to subtractor circuit 3 to make signal Iin. Then, output signal I1 of circuit 3 is fed back to adder circuit 1 by gain control circuit 4 of feedback quantity k (O<=k<1) and is added to signal Iin to form a feedback-type comb line filter. When output signal I1 and signal Iin are subjected to subtraction by substracter circuit 18, output signal I2 becomes an edge signal corresponding to the vertical edge signal of the picture. When signal I2 is compressed by low-level compression circuit 19 and is added to signal I1 by adder circuit 20, signal Iout where sharpness in the vertical direction is improved is outputted. As a result, the S/N of color signals is improved to prevent the color error of a vertical part from being extended.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11842678A JPS5545251A (en) | 1978-09-25 | 1978-09-25 | Filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11842678A JPS5545251A (en) | 1978-09-25 | 1978-09-25 | Filter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5545251A true JPS5545251A (en) | 1980-03-29 |
Family
ID=14736343
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11842678A Pending JPS5545251A (en) | 1978-09-25 | 1978-09-25 | Filter circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5545251A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56149885A (en) * | 1980-04-23 | 1981-11-19 | Matsushita Electric Ind Co Ltd | Color signal processing circuit |
| JPS58212289A (en) * | 1982-06-03 | 1983-12-09 | Sony Corp | Noise eliminating circuit |
| JPS6047378U (en) * | 1983-09-09 | 1985-04-03 | 株式会社ケンウッド | Video noise canceling device |
| JPS60177786A (en) * | 1984-02-24 | 1985-09-11 | Hitachi Denshi Ltd | Video signal processing device |
| JPS61150513A (en) * | 1984-12-25 | 1986-07-09 | Matsushita Electric Ind Co Ltd | comb filter |
| JPH02272894A (en) * | 1989-01-09 | 1990-11-07 | Dubner Computer Syst Inc | Color image sigal encoding |
-
1978
- 1978-09-25 JP JP11842678A patent/JPS5545251A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56149885A (en) * | 1980-04-23 | 1981-11-19 | Matsushita Electric Ind Co Ltd | Color signal processing circuit |
| JPS58212289A (en) * | 1982-06-03 | 1983-12-09 | Sony Corp | Noise eliminating circuit |
| JPS6047378U (en) * | 1983-09-09 | 1985-04-03 | 株式会社ケンウッド | Video noise canceling device |
| JPS60177786A (en) * | 1984-02-24 | 1985-09-11 | Hitachi Denshi Ltd | Video signal processing device |
| JPS61150513A (en) * | 1984-12-25 | 1986-07-09 | Matsushita Electric Ind Co Ltd | comb filter |
| JPH02272894A (en) * | 1989-01-09 | 1990-11-07 | Dubner Computer Syst Inc | Color image sigal encoding |
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