JPS5550744A - Frequency characteristic automatic adjuster in intermediate frequency circuit - Google Patents
Frequency characteristic automatic adjuster in intermediate frequency circuitInfo
- 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
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.
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)
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 |
-
1978
- 1978-10-06 JP JP53122599A patent/JPS5857933B2/en not_active Expired
Cited By (4)
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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