JPH0243032U - - Google Patents
Info
- Publication number
- JPH0243032U JPH0243032U JP1988122471U JP12247188U JPH0243032U JP H0243032 U JPH0243032 U JP H0243032U JP 1988122471 U JP1988122471 U JP 1988122471U JP 12247188 U JP12247188 U JP 12247188U JP H0243032 U JPH0243032 U JP H0243032U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- local oscillation
- supplies
- local
- switching
- 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
Landscapes
- Superheterodyne Receivers (AREA)
Description
第１図はこの考案の一実施例の構成を示すブロ
ツク図、第２図はこの実施例の動作を示すタイミ
ングチヤート図、第３図は従来のＣＡＴＶコンバ
ータの構成を示すブロツク図、第４図は従来のＣ
ＡＴＶコンバータの動作を示すタイミングチヤー
ト図、第５図はノイズ信号消去回路を付加したＣ
ＡＴＶコンバータの構成を示すブロツク図、第６
図は前記ノイズ信号消去回路を付加したＣＡＴＶ
コンバータの動作を示すタイミングチヤート図で
ある。
３２，３３……第１局部発振回路、３４……切
換スイツチ（切換回路）、３５……選局制御回路
（制御回路）、Ｃ４，Ｃ５……選局制御信号（選
局信号）、Ｃ６……切換制御信号。
FIG. 1 is a block diagram showing the configuration of an embodiment of this invention, FIG. 2 is a timing chart showing the operation of this embodiment, FIG. 3 is a block diagram showing the configuration of a conventional CATV converter, and FIG. 4 is the conventional C
A timing chart showing the operation of an ATV converter, Figure 5 is a C with a noise signal cancellation circuit added.
Block diagram showing the configuration of the ATV converter, No. 6
The figure shows a CATV with the noise signal cancellation circuit added.
FIG. 3 is a timing chart showing the operation of the converter. 32, 33...first local oscillation circuit, 34...changeover switch (switching circuit), 35...tuning control circuit (control circuit), C4, C5...tuning control signal (tuning signal), C6... ...Switching control signal.
Claims (1)
御される２個の局部発振回路と、これらの局部発
振回路の局部発振出力のいずれか一方を選択的に
切換えて混合回路に供給する切換回路と、選局す
べきチヤネルに対応する選局信号を前記各局部発
振回路に供給する制御回路とを具備するとともに
、前記制御回路は前記切換回路に選択されていな
い側の局部発振回路に新たな局に対応する選局信
号を出力し、当該局部発振回路のフエイズロツク
ドループがロツクした後に前記切換回路に当該局
部発振回路を選択させることを特徴とする選局切
換装置。 Two local oscillation circuits whose oscillation frequency is controlled by a phase-locked loop, a switching circuit that selectively switches one of the local oscillation outputs of these local oscillation circuits and supplies it to the mixing circuit, and a tuning circuit. a control circuit that supplies each of the local oscillation circuits with a channel selection signal corresponding to a new channel, and the control circuit supplies a selection signal corresponding to a new station to the local oscillation circuit on the side not selected by the switching circuit. 1. A station selection switching device characterized in that the switching circuit selects the local oscillation circuit after outputting a local signal and locking a phase-locked loop of the local oscillation circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988122471U JPH0243032U (en) | 1988-09-19 | 1988-09-19 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988122471U JPH0243032U (en) | 1988-09-19 | 1988-09-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0243032U true JPH0243032U (en) | 1990-03-26 |
Family
ID=31370436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988122471U Pending JPH0243032U (en) | 1988-09-19 | 1988-09-19 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0243032U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006075779A1 (en) * | 2005-01-12 | 2006-07-20 | Nec Corporation | Radio communication equipment |
-
1988
- 1988-09-19 JP JP1988122471U patent/JPH0243032U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006075779A1 (en) * | 2005-01-12 | 2006-07-20 | Nec Corporation | Radio communication equipment |
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