JPS62127112U - - Google Patents
Info
- Publication number
- JPS62127112U JPS62127112U JP1384186U JP1384186U JPS62127112U JP S62127112 U JPS62127112 U JP S62127112U JP 1384186 U JP1384186 U JP 1384186U JP 1384186 U JP1384186 U JP 1384186U JP S62127112 U JPS62127112 U JP S62127112U
- Authority
- JP
- Japan
- Prior art keywords
- output signal
- circuit
- phase
- tuning
- absolute value
- 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
- 239000000284 extract Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
Landscapes
- Networks Using Active Elements (AREA)
Description
第１図はこの考案のＦＭ復調回路を説明する回
路ブロツク図、第２図は第１図の回路ブロツク図
の動作波形を説明する波形図、第３図は従来例の
ＦＭ復調回路を説明する回路ブロツク図である。
１……位相比較器、２……移相器、３……同調
回路、４……ローパスフイルタ回路、５……絶対
値増幅器、６……減算器。
FIG. 1 is a circuit block diagram explaining the FM demodulation circuit of this invention, FIG. 2 is a waveform diagram explaining the operating waveforms of the circuit block diagram of FIG. 1, and FIG. 3 is a diagram explaining the conventional FM demodulation circuit. FIG. 3 is a circuit block diagram. 1... Phase comparator, 2... Phase shifter, 3... Tuning circuit, 4... Low pass filter circuit, 5... Absolute value amplifier, 6... Subtractor.
Claims (1)
相器と、該移相器の出力信号を通過させ可変容量
ダイオードを同調素子に用いた同調回路と、該同
調回路の出力信号と前記ＦＭ変調波の入力信号と
の位相差を比較する位相比較器と、該位相比較器
の出力信号の位相差に比例した電圧を取出すロー
パスフイルタ回路と、該ローパスフイルタ回路の
出力信号を前記同調回路の可変容量ダイオードの
バイアス電圧に重畳してその同調周波数を前記Ｆ
Ｍ変調波の入力信号の周波数に追尾させる手段と
、前記ローパスフイルタ回路の出力信号の絶対値
を増幅する絶対値増幅器と、該絶対値増幅器の出
力信号のレベルを調節して前記ローパス回路の出
力信号より減算する減算器とを備えたことを特徴
とするＦＭ復調回路。 A phase shifter that shifts the phase of an input signal of an FM modulated wave by 90 degrees, a tuning circuit that passes the output signal of the phase shifter and uses a variable capacitance diode as a tuning element, and an output signal of the tuning circuit and the FM modulation. a phase comparator that compares the phase difference with the input signal of the wave; a low-pass filter circuit that extracts a voltage proportional to the phase difference of the output signal of the phase comparator; The tuning frequency is superimposed on the bias voltage of the capacitive diode and the F
means for tracking the frequency of the input signal of the M modulated wave; an absolute value amplifier for amplifying the absolute value of the output signal of the low-pass filter circuit; and an output of the low-pass circuit by adjusting the level of the output signal of the absolute value amplifier. An FM demodulation circuit comprising: a subtracter for subtracting from a signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1384186U JPS62127112U (en) | 1986-01-31 | 1986-01-31 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1384186U JPS62127112U (en) | 1986-01-31 | 1986-01-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62127112U true JPS62127112U (en) | 1987-08-12 |
Family
ID=30803277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1384186U Pending JPS62127112U (en) | 1986-01-31 | 1986-01-31 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62127112U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5419641A (en) * | 1977-07-15 | 1979-02-14 | Victor Co Of Japan Ltd | Fm demodulation circuit by phase tracking loop system |
| JPS59158110A (en) * | 1983-02-28 | 1984-09-07 | Trio Kenwood Corp | Fm demodulator |
-
1986
- 1986-01-31 JP JP1384186U patent/JPS62127112U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5419641A (en) * | 1977-07-15 | 1979-02-14 | Victor Co Of Japan Ltd | Fm demodulation circuit by phase tracking loop system |
| JPS59158110A (en) * | 1983-02-28 | 1984-09-07 | Trio Kenwood Corp | Fm demodulator |
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