JPS5550744A - Frequency characteristic automatic adjuster in intermediate frequency circuit - Google Patents

Frequency characteristic automatic adjuster in intermediate frequency circuit

Info

Publication number
JPS5550744A
JPS5550744A JP12259978A JP12259978A JPS5550744A JP S5550744 A JPS5550744 A JP S5550744A JP 12259978 A JP12259978 A JP 12259978A JP 12259978 A JP12259978 A JP 12259978A JP S5550744 A JPS5550744 A JP S5550744A
Authority
JP
Japan
Prior art keywords
output
threshold values
circuit
intermediate frequency
peak
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
Application number
JP12259978A
Other languages
Japanese (ja)
Other versions
JPS5857933B2 (en
Inventor
Keiji Imai
Kazuhiko Ato
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP53122599A priority Critical patent/JPS5857933B2/en
Publication of JPS5550744A publication Critical patent/JPS5550744A/en
Publication of JPS5857933B2 publication Critical patent/JPS5857933B2/en
Expired 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
    • H03J7/18—Automatic scanning over a band of frequencies
    • H03J7/30—Automatic scanning over a band of frequencies where the scanning is accomplished by mechanical means, e.g. by a motor

Landscapes

  • Monitoring And Testing Of Transmission In General (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

PURPOSE:To perform the adjustment of frequency characteristics automatically, quickly and with good accuracy, by detecting one optimum value of the intermediate frequency output of FM receiver and providing the control means processing this and two threshold values with comparison. CONSTITUTION:The positive and negative peak values of the response output by sweep signal from the intermediate frequency circuit are detected with the peak hold circuit 22 and 23 and held. The positive and negative peaks of the curcuits 22 and 23 are separately selected at the hold output selection circuit 24, and binary signal in A/D conversion 25 is fetched to the computer CM21, which cintrols the pulse motor 37 to establish a single peak. Further, CM21 calculates the threshold values of -3dB and -10dB from the output of the circuit 25 to produce the threshold values 2 and 3. The output 1 and the threshold values 2, 3 are compared 28, 29, the time width corresponding to the output waveform between the two threshold values is counted at the counters 33 and 34, and the output is inputted to CM21. The CM21 controls the adjusting driver 39 so that the difference can be equal to adjust the symmetry and the adjustment of S-shaped charcteristics can automatically be made by controlling the driver 40.
JP53122599A 1978-10-06 1978-10-06 Frequency characteristic automatic adjustment device in intermediate frequency circuit Expired JPS5857933B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53122599A JPS5857933B2 (en) 1978-10-06 1978-10-06 Frequency characteristic automatic adjustment device in intermediate frequency circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53122599A JPS5857933B2 (en) 1978-10-06 1978-10-06 Frequency characteristic automatic adjustment device in intermediate frequency circuit

Publications (2)

Publication Number Publication Date
JPS5550744A true JPS5550744A (en) 1980-04-12
JPS5857933B2 JPS5857933B2 (en) 1983-12-22

Family

ID=14839911

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53122599A Expired JPS5857933B2 (en) 1978-10-06 1978-10-06 Frequency characteristic automatic adjustment device in intermediate frequency circuit

Country Status (1)

Country Link
JP (1) JPS5857933B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57131131A (en) * 1981-02-05 1982-08-13 Matsushita Electric Ind Co Ltd Adjusting device of intermediate frequency circuit
JPS61195741A (en) * 1985-02-27 1986-08-30 Sumitomo Metal Ind Ltd Device for continuous production of composite billet
JPS62176641A (en) * 1986-01-29 1987-08-03 Nippon Steel Corp Core enshroud continuous casting method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57131131A (en) * 1981-02-05 1982-08-13 Matsushita Electric Ind Co Ltd Adjusting device of intermediate frequency circuit
JPS61195741A (en) * 1985-02-27 1986-08-30 Sumitomo Metal Ind Ltd Device for continuous production of composite billet
JPH0413051B2 (en) * 1985-02-27 1992-03-06 Sumitomo Metal Ind
JPS62176641A (en) * 1986-01-29 1987-08-03 Nippon Steel Corp Core enshroud continuous casting method

Also Published As

Publication number Publication date
JPS5857933B2 (en) 1983-12-22

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