JPS58172881U - frequency detection circuit - Google Patents
frequency detection circuitInfo
- Publication number
- JPS58172881U JPS58172881U JP1982071285U JP7128582U JPS58172881U JP S58172881 U JPS58172881 U JP S58172881U JP 1982071285 U JP1982071285 U JP 1982071285U JP 7128582 U JP7128582 U JP 7128582U JP S58172881 U JPS58172881 U JP S58172881U
- Authority
- JP
- Japan
- Prior art keywords
- counter
- counting
- circuit
- detection circuit
- 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.)
- Granted
Links
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図は従来の周波数検出回路図、第２図、第３図は本
考案と従来例の動作説明図、第４図は本考案の実施例を
示す回路図である。
１・晶・・第１カウンタ、２・・・・・・第２カウンタ
、３・・・・・・第３カウンタ、４・・・・・・ＲＯＭ
、５・・・・・・ＡＮＤ回路、６・・・・・・分周回路
、７・・・・・・切替回路。FIG. 1 is a conventional frequency detection circuit diagram, FIGS. 2 and 3 are operation explanatory diagrams of the present invention and the conventional example, and FIG. 4 is a circuit diagram showing an embodiment of the present invention. 1. Crystal: 1st counter, 2: 2nd counter, 3: 3rd counter, 4: ROM
, 5... AND circuit, 6... Frequency dividing circuit, 7... Switching circuit.
Claims (3)
を開始し、プリセットされた値をカウントした後その動
作を停止する第１カウンタと、前記第１カウンタの動作
停止信号によりりランクパルスのカウントを開始し、プ
リセットされた値をカウントした後その動作を停止する
第２カウンタと、クロックパルスの分周回路と、前記分
周回路の出力パルスと前記クロックパルスのいずれかを
選択する切替回路と、前記第２カウンタの動作停止信号
により前記切替回蕗の出力パルスのカウントを開始し、
プリセットされた値をカウントした後その動作を停止す
る第３カウンタと、選択された番地に書き込まれた値を
前記第１、第２および第３カウンタにプリセットするＲ
ＯＭにより構成され、前記第１および第３カウンタの出
力のＡＮＤ回路により被測定信号の周波数を検出する周
波数検出回路。(1) A first counter that starts counting lock pulses when the signal under test is input, stops its operation after counting a preset value, and starts counting rank pulses based on the operation stop signal of the first counter. a second counter that starts and stops its operation after counting a preset value; a clock pulse frequency dividing circuit; and a switching circuit that selects either the output pulse of the frequency dividing circuit or the clock pulse; Start counting the output pulses of the switching circuit in response to the operation stop signal of the second counter,
a third counter that stops its operation after counting the preset value; and R that presets the value written at the selected address to the first, second, and third counters.
A frequency detection circuit configured with an OM and detects the frequency of the signal under test using an AND circuit of the outputs of the first and third counters.
位ビットにより制御される実用新案登録請求の範囲第（
１）項記載の周波数検出回路。(2) The switching means of the switching circuit is configured to
Scope of utility model registration claims controlled by bits (
The frequency detection circuit described in section 1).
れた切替制御用のビットにより制御される実用新案登録
請求の範囲第（１）項記載の周波数検出回路。(3) The frequency detection circuit according to claim 1, wherein the switching means of the switching circuit is controlled by a switching control bit provided in the ROM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1982071285U JPS58172881U (en) | 1982-05-14 | 1982-05-14 | frequency detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1982071285U JPS58172881U (en) | 1982-05-14 | 1982-05-14 | frequency detection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58172881U true JPS58172881U (en) | 1983-11-18 |
| JPH0114936Y2 JPH0114936Y2 (en) | 1989-05-02 |
Family
ID=30080910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1982071285U Granted JPS58172881U (en) | 1982-05-14 | 1982-05-14 | frequency detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58172881U (en) |
-
1982
- 1982-05-14 JP JP1982071285U patent/JPS58172881U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0114936Y2 (en) | 1989-05-02 |
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