JPS642491A - Comb line filter - Google Patents
Comb line filterInfo
- Publication number
- JPS642491A JPS642491A JP15803687A JP15803687A JPS642491A JP S642491 A JPS642491 A JP S642491A JP 15803687 A JP15803687 A JP 15803687A JP 15803687 A JP15803687 A JP 15803687A JP S642491 A JPS642491 A JP S642491A
- Authority
- JP
- Japan
- Prior art keywords
- delay line
- video signal
- characteristic impedance
- input
- filter
- 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
- Processing Of Color Television Signals (AREA)
Abstract
PURPOSE: To simplify the constitution of a comb line filter by using a glass delay line which has a wide band, flat frequency characteristics, and low characteristic impedance for the filter and increasing the input level of a video signal.
CONSTITUTION: The glass delay line DL1 has a 3.58MHz±1.1MHz, flat frequency characteristics, and characteristic impedance about 1/2 as large as that of a conventional delay line. A filter circuit increases the level of the input video signal to 4∼5 VPP, and VR1 and L2 balance the input and output sides and also correct the characteristics. Thus, the input level of the video signal is increased, so a delay line insertion loss compensating amplifier can be omitted, and a phase distortion correcting circuit can be omitted because of the wide band and flat frequency characteristics of the glass delay line DL1. Further, the characteristic impedance of the glass delay line DL1 is low, so a buffer amplifier for an output signal can be omitted.
COPYRIGHT: (C)1989,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15803687A JPS642491A (en) | 1987-06-25 | 1987-06-25 | Comb line filter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15803687A JPS642491A (en) | 1987-06-25 | 1987-06-25 | Comb line filter |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH012491A JPH012491A (en) | 1989-01-06 |
JPS642491A true JPS642491A (en) | 1989-01-06 |
Family
ID=15662873
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15803687A Pending JPS642491A (en) | 1987-06-25 | 1987-06-25 | Comb line filter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS642491A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010032174A (en) * | 2008-07-31 | 2010-02-12 | Hitachi Ltd | Cooling system and electronic device |
-
1987
- 1987-06-25 JP JP15803687A patent/JPS642491A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010032174A (en) * | 2008-07-31 | 2010-02-12 | Hitachi Ltd | Cooling system and electronic device |
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