JPS5826272A - Peak level detecting circuit - Google Patents

Peak level detecting circuit

Info

Publication number
JPS5826272A
JPS5826272A JP12459081A JP12459081A JPS5826272A JP S5826272 A JPS5826272 A JP S5826272A JP 12459081 A JP12459081 A JP 12459081A JP 12459081 A JP12459081 A JP 12459081A JP S5826272 A JPS5826272 A JP S5826272A
Authority
JP
Japan
Prior art keywords
level
reference voltage
input
signal
reset
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
Application number
JP12459081A
Other languages
Japanese (ja)
Inventor
Ryuichi Usami
宇佐美 隆一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP12459081A priority Critical patent/JPS5826272A/en
Publication of JPS5826272A publication Critical patent/JPS5826272A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/04Measuring peak values or amplitude or envelope of ac or of pulses

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

PURPOSE:To remove effect on display time by unevenness of signal level, by providing a means holding a compared result between reference voltage and input signal level and a means resetting the holding means. CONSTITUTION:A signal applied to an input terminal 23 is applied to comparators 10-12, and when an input signal level becomes higher than reference voltage divided by resistances 4-9, flip-flops 19-21 are preset. The preset flip-flops take electric current in from the electric source connected to a terminal 25' through resistances 16'-18' and light emitting diodes 13-15 and make the diodes emit light. While, the reset signal generated in a reset signal generating means 22 is applied to each flip-flop 19-21 and is reset in each prescribed period. By this way, the display time is not affected by unevenness of input level and a displaying operation in accordance with a change of input level is obtained.

Description

【発明の詳細な説明】 本発明は、電気信号レベルのピーク値を検出して表示す
為回路Oビーク値表示保持時間の改善に関する4のであ
る・ 従来、との樵ビーク値検出回路としては第1−〇IEI
會−路構IEOものが用いられて来た・しかし、このよ
う1に回路l1llH,では、入力信号レベルが高いと
、そのレベルが基準電圧よりも下り九後においても、高
いレベルの信号がなお存在しているかの如き表示をして
いる時間が長くなり、入力信号レベルが低い場合には、
こ0時間が短かぐなる。このように表示時間が入力レベ
ルの高低によりて影I#管受けるという欠点を有する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement of the peak value display holding time of a circuit for detecting and displaying the peak value of an electrical signal level. 1-〇IEI
However, in circuits like this, when the input signal level is high, even after the level has fallen below the reference voltage, the high level signal still remains. If the display appears to exist for a long time and the input signal level is low,
The time is short. This has the disadvantage that the display time is affected by the input level.

本発明は、このよう壜信号レベルの高低による自表示時
間への影響を除去しようとするものである・以下、図に
基づき詳細に説明する。
The present invention aims to eliminate the influence of such high/low bottle signal levels on self-display time.Hereinafter, it will be explained in detail based on the drawings.

第1図において、1は逆流阻止用ダイオード、2はビー
タ値保持用抵抗、3はピーク値保持用コンン デtす、4乃至9#′i入力信号レベルとの比較用の基
準電圧発生用抵抗、10乃至12は基準電圧と入力信号
レベルとを比較すb比較器、13乃全15は表示手段で
あり、本例では発光ダイオードである・16乃至18は
発光ダイオード電流調整用抵抗、23は信号入力端、2
4および25は電かへの接続端な示す・ 入力端23に加えられた入力信号はダイオード1、抵抗
2、コンデンサ3tMて比較器10乃至同12C)端子
■に加えられる・−1各比較器の趨子■には、抵抗4及
び同5、同6及び同7%I!r18及び9で分圧された
各基準電圧が加えられている・そして各比較器において
■端の入力信号レベルが■端01&−電圧レベルを越え
九時に1出力側に接続されている発光ダイオード13乃
至pi115t−通してそれぞれ電流を引き込み発光ダ
イオードが点灯して、入力信号のレベルが各比較器に加
えられている基準電圧に違していること管示す・ここで
抵抗2及びコンデンサ3は、以下に述べる1由により設
けられている・即ち人力信号レベルが敗る基準電圧を越
えb時間が非常に短い場合には、比較器や発光ダイオー
ドが動作したとしても人間O@に感知しIItkいこ・
と−曝りうるo L−かし1ピ一クレベル検出回路とし
ては、このような短時間のピーク値をも表示できること
が要求される・そこで、ある入力信号レベルO膵絖時間
が1人間o@y感知し得ないIi[K短い場合であって
も、ilK感知可能な時間迄、その入力レベル管内部的
に保持させておく必要が生ずる・抵抗2とコンデンサ3
はダイオード1と摺着うてこの保持機能を果している一
〇である・ しかし、こO保持機能回路は、抵抗2とコンデンサ3と
の時定数にようて指数逆数的にレベルが低下していくと
いう特性を利用してhるなめ、ビータ値からある基準電
圧まで低下していくための中26は縦続時間Tt有すふ
入力信号を示す。・。
In FIG. 1, 1 is a reverse current blocking diode, 2 is a resistor for holding a beater value, 3 is a capacitor for holding a peak value, 4 to 9 are resistors for generating a reference voltage for comparison with the input signal level, 10 to 12 are b comparators that compare the reference voltage and the input signal level; 13 to 15 are display means, which in this example are light emitting diodes; 16 to 18 are resistors for adjusting the light emitting diode current; 23 is a signal Input end, 2
4 and 25 are connection terminals to the voltage.The input signal applied to the input terminal 23 is applied to the comparator 10 to 12C) terminals through diode 1, resistor 2, and capacitor 3tM. The trend of ■ is resistance 4 and resistance 5, resistance 6 and resistance 7%I! Each reference voltage divided by r18 and r9 is applied.And in each comparator, the input signal level at the ■terminal exceeds the ■terminal 01&- voltage level and the light emitting diode 13 connected to the 1 output side at 9 o'clock. The light emitting diode will light up to indicate that the level of the input signal is different from the reference voltage applied to each comparator.Here, resistor 2 and capacitor 3 are as follows. This is established for reason 1 described in 1. In other words, if the human input signal level exceeds the reference voltage and the time is very short, even if the comparator or light emitting diode operates, it will be detected by the human being and the signal will not be detected.
A single peak level detection circuit is required to be able to display such a short-time peak value. Even if Ii[K which cannot be sensed is short, it is necessary to hold the input level tube internally until the time when ilK can be sensed.Resistor 2 and capacitor 3
is 10, which performs the holding function of the sliding lever with diode 1. However, in this O holding function circuit, the level decreases exponentially in accordance with the time constant of resistor 2 and capacitor 3. 26 indicates an input signal having a cascade time Tt, which is used to decrease from the beater value to a certain reference voltage using this characteristic.・.

〜e、はビーク(!!を示す。破JI27Fi基準電圧
レベルQ管示す・rkJ妙・られかるように縦続時間T
が同じであうても、レベルがe、、 e、、 emと異
なるOK応じて、保持電圧が基準電圧を越えている時間
すなわち表示時間は’l+ t、、 t、と長くなりて
行くことが分る・ピークレベル検出回路に要求される望
ましい動作としては、人間のlli!が感知不能のよう
な短時間のピーク値に対しても感知可能であることも必
要であるが、−万人力信号の変化に、可能表限り忠*<
iAmするものであることもより重要なことである〇 従来の回路構成ではこO’ll求が充分?−またされな
いという欠点があうた0例えば、第2図においてesレ
ベルの信号26が入力して1.時間経過後再び基準レベ
ル27を越える信号が入力した七しても、発光ダイオー
ドは入力の変化に追l111に点滅できず1s時間は点
灯したtまにな9ている。
~e indicates the peak (!!). Broken JI27Fi reference voltage level Q tube indicates rkJ strange cascade time T
It can be seen that even if the values are the same, the time during which the holding voltage exceeds the reference voltage, that is, the display time, becomes longer as 'l + t,, t, depending on the OK whose level is different from e,, e,, em.・The desired operation required of the peak level detection circuit is human lli! Although it is necessary to be able to detect short-term peak values that cannot be detected by
It is also more important that the current circuit configuration is sufficient for this purpose? For example, in FIG. 2, when the es level signal 26 is input, the 1. Even if a signal exceeding the reference level 27 is input again after a period of time has elapsed, the light emitting diode cannot keep up with the change in input and remains lit for 1 second.

本発明は−かかる欠点全除去するため、新しいage保
持回路とリセット回路を設けたものであるO 第3−は本発明の一実施例として検出レベルが3段階の
場合を示す・第1図と比較すると、4乃至9で示される
基準電圧発生用抵抗、10乃Ntルで示される比較器、
13乃至15で示される発光ダイオード、及び16/で
示される発光ダイオード電流調整用抵抗等を有する点は
第1図と同様である。異なる点け、第1図のダイオード
l、抵抗2及びコンデンサ3が削除され、代りに19〜
21で示されるフリ117011回路及びこれらの7リ
ツプ・〕蓼ツブ回路全リセットするためのリセット値舟
を発生するリセット信号発生手段22が設けらねること
がわかる・ 入力端23に加えられた(8号は直接、各比較器OtS
子■に加えられる・各比較器においては端子■に加えら
れておる基準1圧よりも入力信号レベルが高くなうた時
、その出力HK*続されている7リツグ7四ツグをプリ
セットするような1.Eを出力する・こO電圧は、フリ
ッグ7誼ツンのプリセット信号に相当し比較器の入力信
号レベルが基準電圧を越えている間だけ継続すゐ、l’
 13セツトされ九7す7プフロツプは端子25#に接
続さhた電誹から、それぞれ、抵抗(16・、 17’
、 1g’ )及び発光ダイオード(IL 14,15
)を通じて電流を引き込み発光ダイオード管発光させる
・そしてこの状態は、7リツグ7oツブにリセット信号
を加えない限り、たとえ−比較器への入力信号レベルが
基準電圧よつも低くなうて比較器から01リセット信号
がなくなってしt9ても継!+−する。
The present invention is provided with a new age holding circuit and a reset circuit in order to completely eliminate such drawbacks. 3. Figure 1 shows an embodiment of the present invention in which the detection level is in three stages. By comparison, the reference voltage generating resistors are indicated by 4 to 9, the comparators are indicated by 10 to Nt,
It is the same as in FIG. 1 in that it includes light emitting diodes 13 to 15, a light emitting diode current adjustment resistor 16/, and the like. Different points, diode 1, resistor 2 and capacitor 3 in Figure 1 have been deleted and replaced with 19~
It can be seen that there is no reset signal generating means 22 for generating a reset value for resetting the entire circuit of the 117011 circuit and these 7 circuits indicated by 21. The number is directly connected to each comparator OtS.
In each comparator, when the input signal level becomes higher than the reference 1 voltage applied to the terminal ■, the output HK 1. This voltage, which outputs E, corresponds to the preset signal of the flip 7 and continues only as long as the input signal level of the comparator exceeds the reference voltage.
The 97th and 7th flops set to 13 and 7 are connected to the resistors (16, 17', respectively) from the voltage connected to terminal 25#.
, 1g') and light emitting diodes (IL 14,15
) to cause the light-emitting diode tube to emit light.This state will occur unless a reset signal is applied to the 7-ring 7o tube, even if the input signal level to the comparator becomes lower than the reference voltage and the 01 Even if the reset signal is lost and t9 continues! +-.

そして、プリセット信号がなくなうた後K IJ −に
という動作をする。
Then, after the preset signal disappears, the K IJ - operation is performed.

そこで、各フリッフ゛フロップKHリセット4J4号発
生手段!2で発生されたリセッl!号が加えられるよう
K lk *ている。このリセット信号は本書論儒でa
第4@36で示さt1石ように周期1秒を有するパルス
状O信号である。周期TO値はピークレベルO表示cB
2斬管どO椎度の早さで行わせるかによりて′ii!t
うてくる値である0このようなリセット信号を加えるこ
とKよシ、7リツプ7txツブはグリセット信号が無く
なうた債、換言すれば人力信号レベルが基準電圧より下
や九時点より後最大限T秒以内にリセットされ発光ダイ
オードが消えるという動作をすることに亀る・ 今比較器10.同11.及び同12に加えられている基
準電圧をva a vb #及びVC(但しVa<vA
 < VC)とし、成る時間的レベル変動を有する入力
信号に対して、発光ダイオード13.同14及び180
点滅する時開的様相を示すと無4図O如くなる・図中2
8は人力信号、29.30.31はそれぞれVat V
 be V cのレベル、32.33゜314#′iそ
れぞれ発光ダイオード13.同14.同150点滅状況
Cレベル1が点灯を、レベルOが消滅を示す)、35は
リセット信号を示す、玄からも分かるように、人力信号
レベルが各比較器O基準電圧を切うた時には、入力信号
レベルO島低にかかわりなく一定時間り秒以内に発光ダ
イオードの表示が消える・ かくして本発明により、従来の回路*aにおける、継続
時間が同一でありても、そのレベルの高低によ)表示時
間に長511′ft生ずるという欠点は完全に克服され
、人刃傷考レベル変化に即した表示動作が得られるとい
う効果がある。
Therefore, each flip-flop KH reset 4J4 generation means! Reset occurred in 2! K lk * is added so that the number can be added. This reset signal is a
It is a pulse-like O signal having a period of 1 second, as indicated by 4th @36. Period TO value is peak level O display cB
Depends on how fast you want to do the 2nd cut!'ii! t
It is not necessary to add such a reset signal.The 7th lip and 7tx are the values that indicate that the reset signal disappears, in other words, when the human input signal level is below the reference voltage or reaches its maximum after the 9th point. The comparator 10. Now, the comparator operates in such a way that it is reset within T seconds and the light emitting diode turns off. Same 11. And the reference voltage applied to the same 12 is va a vb # and VC (however, Va<vA
< VC) and has a temporal level fluctuation of 13. 14 and 180
If you show the blinking temporal aspect, it will look like Figure 4 O. Figure 2
8 is human power signal, 29.30.31 are respectively Vat V
be Vc level, 32.33°314#'i respectively light emitting diode 13. Same 14. 150 blinking status C level 1 indicates lighting, level O indicates extinction), 35 indicates a reset signal.As can be seen from Gen, when the human signal level crosses the reference voltage of each comparator O, the input signal The display of the light emitting diode disappears within a certain period of time regardless of whether the level is low or low.Thus, according to the present invention, even if the duration is the same in the conventional circuit*a, the display time (depending on the level) The disadvantage that the length of 511' feet is completely overcome, and there is an effect that a display operation that corresponds to a change in the level of human injury consideration can be obtained.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は従来のピークレベル検出回路を示す嫡、flZ
図は従来の保持回路の電圧レベルを示す因、第3図は本
件発@にかかゐピークレベル検出回路管示す図、第4図
は本件発明のピークレベル検出回路における時間と動作
O関係を示す一〇1・・・・・・逆流阻止用ダイオード
、2・・・・・・ピーク値保持用抵抗、3・・・・・・
ビータ値保持用コンデンサ、4゜5.6.7,8.9・
・・・・・基準電圧発生用抵抗、1011.12・・・
・・・比較器、13,14.15・・・・・・表示手段
(説明例では発光ダイオード)、16@1718・・・
・・・電流調整用抵抗、t9.20e 21・・・・・
・フリッグ7aッグ%2’2V・・・・リセット信号発
生手段、23・・・・・・信号入力端、24・・・・・
・基準電圧用電#接続端、25,28・・・・・・・表
示手段用型II’譬絖端、26.28−・・・・・入力
信号、27・・・・・・基準電圧レベルf示す線、29
・・・・・・基準電圧Vaのレベルを示す纏、30・・
・・・・基準電圧■bのレベルを示す−、31・・・・
・・基準電圧VCのレベルを示す線、32・・・・・・
発光ダイオード130点滅状況を示す線、3s・・・・
・・発光タ゛イオード140点滅状況を示す線、34・
・・・・・発光ダイオード15の点滅状況を示す締、3
5・・・・・・り竜ット信号、
Figure 1 shows a conventional peak level detection circuit.
Figure 3 shows the voltage level of the conventional holding circuit, Figure 3 shows the peak level detection circuit according to the present invention, and Figure 4 shows the relationship between time and operation in the peak level detection circuit of the present invention. 101: Reverse current blocking diode, 2: Peak value holding resistor, 3:
Beater value holding capacitor, 4゜5.6.7,8.9・
...Resistor for reference voltage generation, 1011.12...
...Comparator, 13, 14.15...Display means (light emitting diode in the example), 16@1718...
...Current adjustment resistor, t9.20e 21...
- Flig 7a g%2'2V... Reset signal generation means, 23... Signal input terminal, 24...
・Reference voltage power connection end, 25, 28...Type II' wire end for display means, 26.28-...Input signal, 27...Reference voltage Line indicating level f, 29
. . . A line indicating the level of the reference voltage Va, 30 . . .
...Indicates the level of reference voltage ■b -, 31...
...Line indicating the level of reference voltage VC, 32...
A line indicating the blinking status of the light emitting diode 130, 3s...
・・Line indicating the blinking status of the light emitting diode 140, 34・
. . . Indicating the blinking status of the light emitting diode 15, 3
5...Riryut signal,

Claims (1)

【特許請求の範囲】[Claims] 基準電圧発生手段と幀基準電圧と入力信号レベルとを比
較する手段と比較結果を表示する手段を有するピークレ
ベル検出回路において、上記比較手段における比較結果
管保持する手段と該保持手段をリセットするためのリセ
ット信号発生手段とを設けたこと1*徽とするピークレ
ベル検出回路。
In a peak level detection circuit having a reference voltage generating means, a means for comparing the reference voltage and an input signal level, and a means for displaying the comparison result, a means for holding the comparison result in the comparing means and a means for resetting the holding means. 1. A peak level detection circuit having a reset signal generating means.
JP12459081A 1981-08-08 1981-08-08 Peak level detecting circuit Pending JPS5826272A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12459081A JPS5826272A (en) 1981-08-08 1981-08-08 Peak level detecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12459081A JPS5826272A (en) 1981-08-08 1981-08-08 Peak level detecting circuit

Publications (1)

Publication Number Publication Date
JPS5826272A true JPS5826272A (en) 1983-02-16

Family

ID=14889218

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12459081A Pending JPS5826272A (en) 1981-08-08 1981-08-08 Peak level detecting circuit

Country Status (1)

Country Link
JP (1) JPS5826272A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102253288A (en) * 2011-06-30 2011-11-23 迈普通信技术股份有限公司 E1 interface impedance testing device and system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102253288A (en) * 2011-06-30 2011-11-23 迈普通信技术股份有限公司 E1 interface impedance testing device and system

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