JPS54110761A - Automatic frequency following type band pass filter - Google Patents

Automatic frequency following type band pass filter

Info

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
Application number
JP1793578A
Other languages
Japanese (ja)
Inventor
Toyota Noguchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP1793578A priority Critical patent/JPS54110761A/en
Publication of JPS54110761A publication Critical patent/JPS54110761A/en
Pending legal-status Critical Current

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.
JP1793578A 1978-02-17 1978-02-17 Automatic frequency following type band pass filter Pending JPS54110761A (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5227743A (en) * 1990-11-15 1993-07-13 Kabushiki Kaisha Toshiba Automatic filter adjusting apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
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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