JPH0240573A - Detecting device of noise - Google Patents

Detecting device of noise

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Publication number
JPH0240573A
JPH0240573A JP19055788A JP19055788A JPH0240573A JP H0240573 A JPH0240573 A JP H0240573A JP 19055788 A JP19055788 A JP 19055788A JP 19055788 A JP19055788 A JP 19055788A JP H0240573 A JPH0240573 A JP H0240573A
Authority
JP
Japan
Prior art keywords
noise
transmission line
signal
line
counter
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
JP19055788A
Other languages
Japanese (ja)
Inventor
Yuji Suwa
祐司 諏訪
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 JP19055788A priority Critical patent/JPH0240573A/en
Publication of JPH0240573A publication Critical patent/JPH0240573A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To surely detect noise in a transmission line by a simple constitution wherein, the same signal being supplied, the number of signals on a reference line so provided as to bypass a noise source and the number of signals on a line for conducting detection of noise are counted and compared with each other. CONSTITUTION:A transmission line 11 bypassing a transmission line 17 turning to be a noise source is formed for a transmission line 13, and the same clock pulse is delivered to the lines 13 and 11. A counter 12 is provided on the line 11, while a counter 14 is provided on a transmission line 22 taken out from the vicinity of a receiver 18 connected to the line 13. Being cleared by a clear signal inputted from outside, the counters 12 and 14 output signals of H level and L level to a comparator 15 from QA2 to QD2 and QA3 to QD3 at every 1, 2, 4 and 8 pulses respectively. The comparator 15 generates a mismatch signal as a noise detection signal when any one set of signals out of four from each of the counters 12 and 14 are mismatched. By the generation of said signal, LED 16 is lighted. Accordingly, any noise on the line 13 can be checked up easily and there is no possibility of an oversight.

Description

【発明の詳細な説明】 〔概要〕 雑音検出装置に係り、特に基板上の配線に雑音が乗った
ことを検出する雑音検出装置に関し、単純な構成で確実
に伝送ライン中の雑音を検出することができるようにす
ることを目的とし、雑音検出装置を、雑音源を迂回して
設けられ、雑音検出を行うラインと同一の信号提供給さ
れる参照ラインの信号数を計数する第1のカウンタと雑
音検出を行うライン上の信号数および雑音数を計数する
第2のカウンタと、上記両カウンタの出力値を比較し、
両カウンタの出力値が不一致の場合、雑音検出信号とし
ての不一致信号を出力するコンパレータとから構成する
[Detailed Description of the Invention] [Summary] To reliably detect noise in a transmission line with a simple configuration, related to a noise detection device, especially a noise detection device that detects noise on wiring on a board. The noise detection device is equipped with a first counter that is provided bypassing the noise source and that counts the number of signals on a reference line that is supplied with the same signal as the line that performs noise detection. Compare the output values of both counters with a second counter that counts the number of signals and the number of noises on the line for noise detection,
It also includes a comparator that outputs a mismatch signal as a noise detection signal when the output values of both counters do not match.

〔産業上の利用分野〕[Industrial application field]

本発明は、雑音検出装置に係り、特に基板上の配線に雑
音が乗ったことを検出する雑音検出装置に関する。
The present invention relates to a noise detection device, and more particularly to a noise detection device that detects noise on wiring on a board.

プリント基板に伝送ラインを近接して配置すると、隣接
した伝送ラインを伝送される信号の誘導起電力により隣
接する伝送ラインに雑音が発生することがある。このよ
うな雑音が伝送中の信号に混じると、この伝送ラインか
ら信号を受ける情報処理装置が誤動作してしまう。この
ため、装置の試作時等に、伝送ラインが雑音を拾わない
ことを確認しなければならない。
When a transmission line is placed close to a printed circuit board, noise may be generated in the adjacent transmission line due to the induced electromotive force of a signal transmitted through the adjacent transmission line. If such noise mixes with the signal being transmitted, the information processing device that receives the signal from this transmission line will malfunction. Therefore, when prototyping the device, it is necessary to confirm that the transmission line does not pick up noise.

(従来の技術) 従来このような、伝送ラインに雑音が発生しているかど
うかを調べるには、当該伝送ライン上を伝送されている
信号の波形をオシロスコープ等でaSするようにしてい
る。
(Prior Art) Conventionally, in order to check whether noise is occurring on a transmission line, the waveform of a signal being transmitted on the transmission line is subjected to aS using an oscilloscope or the like.

(発明が解決しようとする課題) ところで、上述したようにオシロスコープ等で波形を観
察するため、雑音が信号中に表れるのは一瞬であるため
、この雑音を見逃すこともある。
(Problem to be Solved by the Invention) By the way, as mentioned above, since the waveform is observed using an oscilloscope or the like, noise appears in the signal only for a moment, so this noise may be overlooked.

また、雑音波形を観察するためのオシロスコープ等を準
備する必要がある。
It is also necessary to prepare an oscilloscope or the like to observe the noise waveform.

そこで本発明は、単純な構成で確実に伝送ライン中の雑
音を検出できる雑音検出装置を提供することを目的とす
る。
SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a noise detection device that can reliably detect noise in a transmission line with a simple configuration.

〔課題を解決するための手段〕[Means to solve the problem]

本発明にあって、上記の課題を解決するための手段は、
第1図に示すように雑音検出装置を、雑音源を迂回して
設けられ、雑音検出を行うラインと同一の信号が供給さ
れる参照ライン1の信号数を計数する第1のカウンタ2
、雑音検出を行うライン3上の信号数および雑音数計数
をする第2のカウンタ4と、上記両カウンタ3,4の出
力値を比較し、両カウンタ2.4の出力値が不一致の場
合雑音検出信号としての不一致信号を出力するコンパレ
ータ5とを有するものとしたことである。また、前記コ
ンパレータ5が出力する前記不一致信号を受け、雑音検
出表示を行う表示手段6を設けることとした。
In the present invention, means for solving the above problems are as follows:
As shown in FIG. 1, the noise detection device is provided with a first counter 2 which is provided bypassing the noise source and counts the number of signals on a reference line 1 to which the same signal as the line on which noise detection is performed is supplied.
, a second counter 4 that counts the number of signals and noise on line 3 for noise detection and the output values of both counters 3 and 4 are compared, and if the output values of both counters 2.4 do not match, noise is detected. The present invention includes a comparator 5 that outputs a mismatch signal as a detection signal. Further, a display means 6 is provided which receives the mismatch signal outputted from the comparator 5 and displays noise detection.

〔作用〕[Effect]

本発明によれば、ライン3に雑音が入ると、第2のカウ
ンタ4の計数結果と雑音が入らない第1のカウンタ2の
計数結果が異なることとなり、コンパレータ5が雑音信
号としての不一致信号を発生し、これにより容易且つ確
実に伝送ライン3の雑音検出を行うことができる。
According to the present invention, when noise enters the line 3, the counting result of the second counter 4 and the counting result of the first counter 2, which does not contain noise, differ, and the comparator 5 detects the mismatch signal as a noise signal. This makes it possible to easily and reliably detect noise on the transmission line 3.

また、このコンパレータ5の不一致信号を受け、雑音検
出表示を表示手段6を設けたので、伝送ライン3の雑音
検出を容易に確認できる。
Furthermore, since a display means 6 is provided to receive the mismatch signal from the comparator 5 and display a noise detection display, detection of noise in the transmission line 3 can be easily confirmed.

〔実施例〕〔Example〕

以下本発明に係る雑音検出装置の実施例を図面に基づい
て説明する。
Embodiments of the noise detection device according to the present invention will be described below based on the drawings.

第2図及び第3図は本発明に係る雑音検出装置の実施例
を示すものである。本実施例において、プリント基板上
に2本の伝送ラインが平行して設けられている。そして
、一方の伝送ラインには第3図(1)に示すようなりロ
ックパルスが送出されている。そして、この伝送ライン
に近接した第2の伝送ラインには第3図(4)に示すよ
うなローレベルからハイレベルに変化する信号が入力さ
れるものとする。そして、各信号は夫々反転器20.2
1で反転され夫々第3図(2)及び第3図(4)に示す
信号が伝送され、第1の伝送ラインにはレシーバ18が
接続されると共に第2の伝送ラインには他の装置が接続
されているものとする。
FIGS. 2 and 3 show an embodiment of the noise detection device according to the present invention. In this embodiment, two transmission lines are provided in parallel on the printed circuit board. A lock pulse is sent to one transmission line as shown in FIG. 3 (1). It is assumed that a signal changing from a low level to a high level as shown in FIG. 3(4) is input to a second transmission line adjacent to this transmission line. Then, each signal is transferred to an inverter 20.2.
1, the signals shown in FIG. 3 (2) and FIG. 3 (4) are transmitted, and the receiver 18 is connected to the first transmission line, and other devices are connected to the second transmission line. Assume that it is connected.

本実施例において、雑音検出装置10は、上記の第1の
伝送ライン13が第2の伝送ラインに接近する地点より
手前で雑音源となる第2の伝送ライン17を迂回した伝
送ライン11を形成し、第1の伝送ライン13と同様に
反転器19を設けてこの迂回伝送ライン11に、第3図
(3)に示すように、第1の伝送ライン13と同一のク
ロックパルスを送出する。そしてこの迂回伝送ライン1
1には第1のカウンタ12を設け、第1の伝送ライン1
3に接続したレシーバ18近傍から取り出した伝送ライ
ン22に第2のカウンタ14を設けるようにしている。
In this embodiment, the noise detection device 10 forms a transmission line 11 that bypasses the second transmission line 17, which is a noise source, before the point where the first transmission line 13 approaches the second transmission line. However, like the first transmission line 13, an inverter 19 is provided to send the same clock pulse as the first transmission line 13 to the detour transmission line 11, as shown in FIG. 3(3). And this detour transmission line 1
1 is provided with a first counter 12, and the first transmission line 1 is provided with a first counter 12.
The second counter 14 is provided on the transmission line 22 taken out from the vicinity of the receiver 18 connected to the second counter 14.

このカウンタ12,14は外部から入力されるクリア信
号によってクリアされると共に第3図(6)〜(13)
に示すように、1パルス、2パルス、4パルス及び8パ
ルス毎にハイレベルの信号とローレベルの信号とを夫々
QA2〜QD2及びQA3〜QB3から出力するもので
ある。そして、この2つのカウンタ12.14の夫々4
組の出力はこれらの信号が1組でも一致しないときに雑
音検出信号としての不一致信号を発生するコンパレータ
15に接続されている。そしてこのコンパレータ15に
は、このコンパレータ15が不一致信号を発生したとき
雑音検出信号として発行する表示手段としての発光ダイ
オード16を設けている。
These counters 12 and 14 are cleared by a clear signal input from the outside, and as shown in FIG. 3 (6) to (13).
As shown in the figure, a high level signal and a low level signal are output from QA2 to QD2 and QA3 to QB3 every 1 pulse, 2 pulses, 4 pulses, and 8 pulses, respectively. And each of these two counters 12.14 is 4
The outputs of the sets are connected to a comparator 15 which generates a mismatch signal as a noise detection signal when even one of these signals does not match. The comparator 15 is provided with a light emitting diode 16 as a display means for issuing a noise detection signal when the comparator 15 generates a mismatch signal.

次に本実施例の作動を説明する。この例では両カウンタ
12.14にクリア信号が入力された後、第2の伝送ラ
イン17の信号がハイレベルからローレベルに変ったた
め、第1の伝送ライン13に雑音が発生した場合である
Next, the operation of this embodiment will be explained. In this example, after the clear signals are input to both counters 12 and 14, the signal on the second transmission line 17 changes from high level to low level, so that noise occurs on the first transmission line 13.

このとき第2のカウンタ14は通常より早い雑音パルス
により1パルス毎に反転する出力は第1のカウンタ12
より早いタイミングで反転して、雑音の次の通常のクロ
ックパルスで更に反転する。すると第1のカウンタ12
の出力とは、反転した出力となり、コンパレータ15は
第3図(14)に示すように、不一致信号を発生して、
発光ダイオード16は点灯する。ここで2パルス毎、3
パルス毎及び4パルス毎に信号が反転する信号は夫々ク
ロツク信号1パルス分ずつ位相がずれるだけであるが第
3図(8)〜(13)、これは、雑音が2つ入った時に
第2のカウンタの1パルス毎に反転する出力は再度反転
して第1のカウンタの出力と同一になったとき、有効と
なる。この場合2パルス毎に反転する出力は、第1のカ
ウンタの出力と反転した状態となるため、コンパレータ
15は不一致信号を出し続け、発光ダイオード16は点
灯を続ける 従って本実施例に係る雑音検出装置によれば、簡単な装
置で確実に雑音を検出することができる。また複数の雑
音が流れても発光ダイオードは点灯し続けるから、雑音
の発生をを見落とす虞もない。
At this time, the output of the second counter 14, which is inverted every pulse due to the noise pulse earlier than usual, is the output of the first counter 12.
It inverts earlier and further inverts on the next normal clock pulse of the noise. Then the first counter 12
The output is an inverted output, and the comparator 15 generates a mismatch signal as shown in FIG.
The light emitting diode 16 lights up. Here every 2 pulses, 3
The signals whose signals are inverted every pulse and every 4 pulses are only shifted in phase by one pulse of the clock signal, respectively. The output of the counter that is inverted every pulse becomes valid when it is inverted again and becomes the same as the output of the first counter. In this case, the output that is inverted every two pulses is inverted with the output of the first counter, so the comparator 15 continues to output a mismatch signal, and the light emitting diode 16 continues to light up. Therefore, the noise detection device according to this embodiment According to , noise can be detected reliably with a simple device. Furthermore, since the light emitting diode continues to light up even when multiple noises are generated, there is no risk of overlooking the occurrence of noise.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、本発明によれば雑音検出装置を雑
音源を迂回して設けた参照ラインの信号数を計数する第
1のカウンタと、雑音検出を行うライン上の信号数およ
び雑音数を計数する第2のカウンタと、上記両カウンタ
の出力値が不一致の場合、雑音検出信号としての不一致
信号を出力するコンパレータを設けるように構成したか
ら、伝送ラインの雑音を簡単な装置で確実に検出するこ
とができるという効果を奏する。また、このコンパレー
タの不一致信号を受け、雑音検出表示を行う表示手段を
設けたので、伝送ラインの雑音を容易に確認でき見落す
虞もない。
As explained above, according to the present invention, the noise detection device includes a first counter that counts the number of signals on the reference line provided bypassing the noise source, and a first counter that counts the number of signals and noise on the line on which noise is to be detected. If the output values of the second counter for counting and the above-mentioned two counters do not match, the configuration is provided with a comparator that outputs a mismatch signal as a noise detection signal, so noise in the transmission line can be reliably detected with a simple device. It has the effect of being able to Further, since a display means is provided for receiving the mismatch signal from the comparator and displaying noise detection, noise in the transmission line can be easily confirmed and there is no risk of overlooking it.

示すタイムチャートである。FIG.

1・・・参照ライン 2・・・第1のカウンタ 3・・・ライン 4・・・第2のカウンタ 5・・・コンパレータ 6・・・表示手段1...Reference line 2...first counter 3... line 4...Second counter 5...Comparator 6...Display means

Claims (2)

【特許請求の範囲】[Claims] (1)雑音源を迂回して設けられ、雑音検出を行うライ
ン(3)と同一の信号が供給される参照ライン(1)の
信号数を計数する第1のカウンタ(2)と、 雑音検出を行うライン(3)上の信号数および雑音数を
計数する第2のカウンタ(4)と、上記両カウンタ(2
)、(4)の出力値を 比較し、両カウンタ(2)、(4)の出力値が不一致の
場合雑音検出信号としての不一致信号を出力するコンパ
レータ(5)とを有することを特徴とする雑音検出装置
(1) A first counter (2) that counts the number of signals on a reference line (1) that is provided to bypass the noise source and is supplied with the same signal as the line (3) that performs noise detection; and noise detection. a second counter (4) that counts the number of signals and noise on the line (3) that performs
) and (4), and if the output values of both counters (2) and (4) do not match, a comparator (5) outputs a mismatch signal as a noise detection signal. Noise detection device.
(2)前記コンパレータ(5)が出力する前記不一致信
号を受け、雑音検出表示を行う表示手段(6)を設けた
ことを特徴とする請求項1に記載の雑音検出装置。
(2) The noise detection device according to claim 1, further comprising display means (6) for receiving the mismatch signal output from the comparator (5) and displaying noise detection.
JP19055788A 1988-08-01 1988-08-01 Detecting device of noise Pending JPH0240573A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19055788A JPH0240573A (en) 1988-08-01 1988-08-01 Detecting device of noise

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19055788A JPH0240573A (en) 1988-08-01 1988-08-01 Detecting device of noise

Publications (1)

Publication Number Publication Date
JPH0240573A true JPH0240573A (en) 1990-02-09

Family

ID=16260054

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19055788A Pending JPH0240573A (en) 1988-08-01 1988-08-01 Detecting device of noise

Country Status (1)

Country Link
JP (1) JPH0240573A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009130460A1 (en) * 2008-04-25 2009-10-29 Glonav Limited Method and system for detecting timing characteristics in a communications system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009130460A1 (en) * 2008-04-25 2009-10-29 Glonav Limited Method and system for detecting timing characteristics in a communications system
US8677172B2 (en) 2008-04-25 2014-03-18 St-Ericsson Sa Method and system for correcting error in a PLL generated clock signal using a system clock of lower frequency and/or accuracy

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