JPH0197628U - - Google Patents
Info
- Publication number
- JPH0197628U JPH0197628U JP19329287U JP19329287U JPH0197628U JP H0197628 U JPH0197628 U JP H0197628U JP 19329287 U JP19329287 U JP 19329287U JP 19329287 U JP19329287 U JP 19329287U JP H0197628 U JPH0197628 U JP H0197628U
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- output
- variable
- signal
- difference
- 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
- 230000010355 oscillation Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Television Receiver Circuits (AREA)
Description
第１図は本考案の一実施例における選局装置の
ブロツク図、第２図は従来のブロツク図である。
１…アンテナ、２…高周波増幅器、３…ミキサ
ー、４…バンドパスフイルター、５…中間周波増
幅器、６…映像信号検波器、７…中間周波中の映
像キヤリヤの同調器、８…固定分周器、９…比較
器、１０…分周器、１１…マイクロプロセツサー
、１２…基準発振器、１３…分周器、１４…比較
器、１５…可変分周器、１６…固定分周器、１７
…局部発振回路、１８…チユーニング電圧用ロー
パスフイルター、１９…ＦＭ検波器、２０…Ａ／
Ｄ変換器。
FIG. 1 is a block diagram of a channel selection device according to an embodiment of the present invention, and FIG. 2 is a conventional block diagram. 1...Antenna, 2...High frequency amplifier, 3...Mixer, 4...Band pass filter, 5...Intermediate frequency amplifier, 6...Video signal detector, 7...Tuner of video carrier in intermediate frequency, 8...Fixed frequency divider , 9... Comparator, 10... Frequency divider, 11... Microprocessor, 12... Reference oscillator, 13... Frequency divider, 14... Comparator, 15... Variable frequency divider, 16... Fixed frequency divider, 17
...Local oscillation circuit, 18...Low pass filter for tuning voltage, 19...FM detector, 20...A/
D converter.
Claims (1)
混合し、その差周波数成分の中間周波信号を得る
混合手段と、前記可変発振器の出力を分周する可
変分周器と、この可変分周器の出力と基準信号源
の出力とを比較し、その周波数の差に応じて前記
可変発振器の発振周波数を変化せしめる手段と、
前記中間周波信号より得られた主搬送波信号成分
を分周した分周出力と基準信号の出力とを比較し
、その周波数の差に応じて前記可変分周器の分周
比を変化せしめる手段とを備えた選局装置。 a mixing means for mixing the received high frequency signal and the output of the variable oscillator to obtain an intermediate frequency signal of the difference frequency component; a variable frequency divider for frequency dividing the output of the variable oscillator; means for comparing the output with the output of a reference signal source and changing the oscillation frequency of the variable oscillator according to the difference in frequency;
means for comparing a frequency-divided output obtained by frequency-dividing the main carrier signal component obtained from the intermediate frequency signal and an output of a reference signal, and changing the frequency division ratio of the variable frequency divider according to the difference in frequency; A channel selection device equipped with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19329287U JPH0197628U (en) | 1987-12-18 | 1987-12-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19329287U JPH0197628U (en) | 1987-12-18 | 1987-12-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0197628U true JPH0197628U (en) | 1989-06-29 |
Family
ID=31484090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19329287U Pending JPH0197628U (en) | 1987-12-18 | 1987-12-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0197628U (en) |
-
1987
- 1987-12-18 JP JP19329287U patent/JPH0197628U/ja active Pending
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