JPH0277676U - - Google Patents
Info
- Publication number
- JPH0277676U JPH0277676U JP14574488U JP14574488U JPH0277676U JP H0277676 U JPH0277676 U JP H0277676U JP 14574488 U JP14574488 U JP 14574488U JP 14574488 U JP14574488 U JP 14574488U JP H0277676 U JPH0277676 U JP H0277676U
- Authority
- JP
- Japan
- Prior art keywords
- counter
- rectangular wave
- alternating current
- time
- signal
- 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
- 238000007493 shaping process Methods 0.000 claims 4
- 238000001514 detection method Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 4
- 210000000056 organ Anatomy 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Landscapes
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
Description
第1図は本考案の第1の解決手段に対応した実
施例を示すブロツク図であり、第2図は第1図に
示す実施例回路の動作をあらわした動作波形図、
第3図は本考案の第2の解決手段に対応した実施
例を示すブロツク図、第4図は第3図に示す実施
例回路の各部の動作をあらわした動作波形図であ
る。
1……変圧器、2……コンパレータ、3……第
1カウンタ、4……第2カウンタ、5……排他的
論理和素子、6……メモリー、7……クロツク発
振回路、8……分周器。
FIG. 1 is a block diagram showing an embodiment corresponding to the first solution of the present invention, and FIG. 2 is an operation waveform diagram showing the operation of the embodiment circuit shown in FIG.
FIG. 3 is a block diagram showing an embodiment corresponding to the second solution of the present invention, and FIG. 4 is an operation waveform diagram showing the operation of each part of the embodiment circuit shown in FIG. 1...Transformer, 2...Comparator, 3...First counter, 4...Second counter, 5...Exclusive OR element, 6...Memory, 7...Clock oscillation circuit, 8...Minute Peripheral organs.
Claims (1)
形整形する手段と、この矩形波信号の零点通過時
点を起点にして前記交流信号の周期の1/2より
も短い時間をクロツクパルスの計数で検出する第
1カウンタと、前記と同じ零点通過時点を起点に
して前記交流信号の周期の1/2よりも長い時間
をクロツクパルスの計数で検出する第2カウンタ
と、前記矩形波信号の次の零点通過時点が前記第
1カウンタのカウントアツプ以後でかつ前記第2
カウンタのカウントアツプ以前であるか否かを判
定する手段とを備えていることを特徴とする周波
数検出回路。 (2) 交流信号をこれに対応した矩形波に波形整
形する手段と、この矩形波の周波数を1/2に分
周する手段と、この分周手段が出力する矩形波の
零点通過時点を起点にして、前記交流信号の周期
よりも矩い時間をクロツクパルスの計数で検出す
る第1カウンタと、前記と同じ零点通過時点を起
点にして、前記交流信号の周期よりも長い時間を
クロツクパルスの計数で検出する第2カウンタと
、前記分周手段が出力する矩形波の次の零点通過
時点が、前記第1カウンタのカウントアツプ以後
で、かつ前記第2カウンタのカウントアツプ以前
であるか否かを判定する手段とで構成しているこ
とを特徴とする周波数検出回路。[Claims for Utility Model Registration] (1) Means for waveform shaping an alternating current signal into a corresponding rectangular wave signal, and a means for shaping the waveform of an alternating current signal into a corresponding rectangular wave signal, and a means for shaping the waveform of an alternating current signal into a corresponding rectangular wave signal; a first counter that detects a shorter time by counting clock pulses, and a second counter that detects a time longer than 1/2 of the period of the alternating current signal by counting clock pulses, starting from the same zero point passing time as described above; If the next zero point passing point of the rectangular wave signal is after the count-up of the first counter and the second
1. A frequency detection circuit comprising: means for determining whether or not a time has elapsed before a counter has counted up. (2) means for shaping the waveform of an alternating current signal into a corresponding rectangular wave, means for dividing the frequency of this rectangular wave into 1/2, and a starting point at the time when the rectangular wave output from this frequency dividing means passes the zero point. a first counter that detects a time period that is more rectangular than the period of the AC signal by counting clock pulses; Determining whether the second counter to be detected and the next zero point passing point of the rectangular wave output by the frequency dividing means are after the first counter counts up and before the second counter counts up. 1. A frequency detection circuit comprising: means for detecting a frequency;
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14574488U JPH0277676U (en) | 1988-08-04 | 1988-11-08 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10341488 | 1988-08-04 | ||
JP14574488U JPH0277676U (en) | 1988-08-04 | 1988-11-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0277676U true JPH0277676U (en) | 1990-06-14 |
Family
ID=31718765
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14574488U Pending JPH0277676U (en) | 1988-08-04 | 1988-11-08 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0277676U (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5838750A (en) * | 1981-08-31 | 1983-03-07 | Kinyoushiya:Kk | Processing of millable urethane rubber |
JPS58225720A (en) * | 1982-06-24 | 1983-12-27 | Nippon Signal Co Ltd:The | Frequency detecting circuit |
-
1988
- 1988-11-08 JP JP14574488U patent/JPH0277676U/ja active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5838750A (en) * | 1981-08-31 | 1983-03-07 | Kinyoushiya:Kk | Processing of millable urethane rubber |
JPS58225720A (en) * | 1982-06-24 | 1983-12-27 | Nippon Signal Co Ltd:The | Frequency detecting circuit |
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