JPS54110761A - Automatic frequency following type band pass filter - Google Patents
Automatic frequency following type band pass filterInfo
- Publication number
- JPS54110761A JPS54110761A JP1793578A JP1793578A JPS54110761A JP S54110761 A JPS54110761 A JP S54110761A JP 1793578 A JP1793578 A JP 1793578A JP 1793578 A JP1793578 A JP 1793578A JP S54110761 A JPS54110761 A JP S54110761A
- Authority
- JP
- Japan
- Prior art keywords
- band pass
- pass filter
- output
- frequency
- amplifier
- 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
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
- H03J7/02—Automatic frequency control
Landscapes
- Networks Using Active Elements (AREA)
Abstract
PURPOSE:To obtain an automatic frequency following type band pass filter by securing a coincidence between the central frequency and the higher-energy frequency among the input frequencies. CONSTITUTION:The signals sent from input terminal 6 are amplified through amplifier 7 and the led to variable frequency band pass filter (VBPF) 8 and 9. The central frequency at the fixed control voltage V is set up previously for VBPF 8 and 9 to constitute the band pass filters featuring such characterisitcs that the phase is inverted centering on the passinb central frequencies fc8 and fc9. The output difference between VBPF8 and 9 is amplified through differential amplifier 12 to be drawn out in the form of the output. In the other hand, the output of 8 and 9 are applied to differential amplifier 13 via envelope curve detector 10 and 11. Then the output of amplifier 13 is smpplied to up-down counter 17 to control the operation of the corresponding counter. Thus, V can be varied to satisfy fin=fc.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1793578A JPS54110761A (en) | 1978-02-17 | 1978-02-17 | Automatic frequency following type band pass filter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1793578A JPS54110761A (en) | 1978-02-17 | 1978-02-17 | Automatic frequency following type band pass filter |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54110761A true JPS54110761A (en) | 1979-08-30 |
Family
ID=11957624
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1793578A Pending JPS54110761A (en) | 1978-02-17 | 1978-02-17 | Automatic frequency following type band pass filter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54110761A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5227743A (en) * | 1990-11-15 | 1993-07-13 | Kabushiki Kaisha Toshiba | Automatic filter adjusting apparatus |
-
1978
- 1978-02-17 JP JP1793578A patent/JPS54110761A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5227743A (en) * | 1990-11-15 | 1993-07-13 | Kabushiki Kaisha Toshiba | Automatic filter adjusting apparatus |
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