JPS5871241U - Reception frequency display circuit - Google Patents
Reception frequency display circuitInfo
- Publication number
- JPS5871241U JPS5871241U JP16568581U JP16568581U JPS5871241U JP S5871241 U JPS5871241 U JP S5871241U JP 16568581 U JP16568581 U JP 16568581U JP 16568581 U JP16568581 U JP 16568581U JP S5871241 U JPS5871241 U JP S5871241U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- frequency display
- time constant
- display circuit
- reception frequency
- 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
- Circuits Of Receivers In General (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は本考案による受信周波数表示回路の実線例を示
すブロック図、第２図イル二及び第３図イ〜ワは本実施
例の動作を説明するためのタイミングチャートである。
主な図番の説明、１・・・ＡＭ局部発振器、２・・・Ｆ
Ｍ局部発振器、３，４・・・増幅回路、５・・・計数回
路、６・・・プリセット回路、７，２２・・・ＡＮＤゲ
ート、８・・・ラッチ回路、９・・・デコーダ及びドラ
イバ、１０・・・表示器、１１・・・バンド切換検出回
路、１２゜１３．１５．２３・・・Ｄフリップフロップ
、１４・・・ＥＸ−ＯＲゲート、１６・・・時定数回路
、１７．２＝４゜２５・・・ＮＭＯ３Ｔ、Ｉ Ｂ・・・
抵抗、１９・・・コンデンサ、２０．２１・・・インバ
ータ。FIG. 1 is a block diagram showing a solid line example of a receiving frequency display circuit according to the present invention, and FIG. Explanation of main figure numbers, 1...AM local oscillator, 2...F
M local oscillator, 3, 4... amplifier circuit, 5... counting circuit, 6... preset circuit, 7, 22... AND gate, 8... latch circuit, 9... decoder and driver , 10...Display device, 11...Band switching detection circuit, 12°13.15.23...D flip-flop, 14...EX-OR gate, 16...Time constant circuit, 17. 2=4゜25...NMO3T, IB...
Resistor, 19... Capacitor, 20.21... Inverter.
Claims (1)
時間計数し、該計数回路の計数値に基づ０て受信周波数
を得るようにした受信周波数表示回路において、前記計
数回路の計数値を記憶する記憶回路と、受信バンド切換
信号の変化を検出するバンド切換検出回路と、該検出回
路の出力により動作する時定数回路と、前記記憶回路へ
の前記計数値の書き込みを制御する書き込み信号を前記
時定数回路の出力に応じて禁止する禁止回路とを有し、
受信バンドを切換えた後、前記時定数回路で定まる所定
時間、前記記憶回路への前記計数値の書き込みを禁止す
るようにしたことを特徴とする受信周波数表示回路。In a receiving frequency display circuit, the local oscillation frequency of a radio receiver is counted by a counting circuit for a certain period of time, and the receiving frequency is obtained based on the counted value of the counting circuit. A storage circuit for storing information, a band switching detection circuit for detecting a change in a reception band switching signal, a time constant circuit operated by the output of the detection circuit, and a write signal for controlling writing of the counted value into the storage circuit. and a prohibition circuit that prohibits according to the output of the time constant circuit,
A reception frequency display circuit, characterized in that, after switching the reception band, writing of the count value to the storage circuit is prohibited for a predetermined time determined by the time constant circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16568581U JPS5871241U (en) | 1981-11-05 | 1981-11-05 | Reception frequency display circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16568581U JPS5871241U (en) | 1981-11-05 | 1981-11-05 | Reception frequency display circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5871241U true JPS5871241U (en) | 1983-05-14 |
Family
ID=29957874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16568581U Pending JPS5871241U (en) | 1981-11-05 | 1981-11-05 | Reception frequency display circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5871241U (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53101202A (en) * | 1977-02-16 | 1978-09-04 | Hitachi Ltd | Frequency display device |
| JPS553238A (en) * | 1978-06-22 | 1980-01-11 | Nippon Gakki Seizo Kk | Reception frequency display system |
| JPS5542014A (en) * | 1978-09-20 | 1980-03-25 | Hitachi Ltd | Indicating element drive system |
-
1981
- 1981-11-05 JP JP16568581U patent/JPS5871241U/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53101202A (en) * | 1977-02-16 | 1978-09-04 | Hitachi Ltd | Frequency display device |
| JPS553238A (en) * | 1978-06-22 | 1980-01-11 | Nippon Gakki Seizo Kk | Reception frequency display system |
| JPS5542014A (en) * | 1978-09-20 | 1980-03-25 | Hitachi Ltd | Indicating element drive system |
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