JPS61104371A - Error rate measuring method - Google Patents

Error rate measuring method

Info

Publication number
JPS61104371A
JPS61104371A JP59221582A JP22158284A JPS61104371A JP S61104371 A JPS61104371 A JP S61104371A JP 59221582 A JP59221582 A JP 59221582A JP 22158284 A JP22158284 A JP 22158284A JP S61104371 A JPS61104371 A JP S61104371A
Authority
JP
Japan
Prior art keywords
error
circuit
error rate
correction
data
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
JP59221582A
Other languages
Japanese (ja)
Inventor
Mamoru Ueda
衛 上田
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP59221582A priority Critical patent/JPS61104371A/en
Publication of JPS61104371A publication Critical patent/JPS61104371A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10Digital recording or reproducing
    • G11B20/18Error detection or correction; Testing, e.g. of drop-outs
    • G11B20/1816Testing

Abstract

PURPOSE:To measure quantitatively the error rate of data at the reproducing time by counting error flags, which are generated from an error detecting (correcting) circuit at the reproducing time, in accordance with an error detection (correction) code and measuring the error rate of reproduced data on the basis of the counted value. CONSTITUTION:Data reproduced from a tape 1 passes a reproducing circuit 3 and is sent to an error correcting circuit 4 and is subjected to processings such as error detection and correction or the like and is sent to an output circuit 5. Meanwhile, error flags generated at this time are counted for a certain time by an error counting circuit 6, and the error rate is calculated in accordance with the counted value by an operating circuit 7 and is sent to a display device 8.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はデジタルVTR等の誤り本測定に関するもので
、特に再生時に誤り検出符号より発生されるエラー・フ
ラグを計数する事により、その再生データの誤り率を測
定するものである。
[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to the measurement of errors in digital VTRs, etc., and in particular, by counting error flags generated from error detection codes during playback, the playback data can be detected. It measures the error rate of

〔従来の技術〕[Conventional technology]

デジタルVTR等の記録・再生系の評価纜おいては、再
生データの誤り率が一つの大きな要素であり、この誤り
4によってシステム全体が太き(左右される。従って誤
り率の測定は不可欠な作業であるが、種々の条件に影響
されるためその定量的把握は錐かしく、これまでにも6
徨の方法が採用されている。
In the evaluation of recording/playback systems such as digital VTRs, the error rate of reproduced data is one of the major factors, and this error4 affects the overall system.Therefore, measuring the error rate is essential. However, since it is affected by various conditions, it is difficult to understand it quantitatively, and so far, 6
Tori's method is used.

例えば誤り率が悪化して誤り訂正能力を超えてしまうと
、再生画像に残留誤りが現われてしまう。
For example, if the error rate worsens and exceeds the error correction capability, residual errors will appear in the reproduced image.

あるいは訂正能力の範囲内の誤りも、その誤り訂正の機
能を停止させれば、そのまま再生画像に誤りが現われる
。従来はこの再生画像に現われる残留誤りから誤り率を
推定していたが、測定が目視によるため定量化できず、
把握が困難であった。
Alternatively, if the error correction function is stopped, the error will appear in the reproduced image even if the error is within the range of the correction capability. Conventionally, the error rate was estimated from the residual errors that appear in the reproduced image, but since the measurement was done visually, it was not possible to quantify the error rate.
It was difficult to understand.

一方もう一つの測定法としては、デジタルVTRと同じ
データ・レートで、ある特定のデータ・パターン(M系
列等)y!−発生して記録し、再生時に再生データ音ピ
ット比較して誤りを計数する方法がある。この方法では
瞑り率χ定量的Kf411定できるが、しかし測定のた
めの治具を必要とし、また通常の動作モードでは測定で
きない。
On the other hand, another measurement method is to measure a certain data pattern (such as M sequence) y! at the same data rate as a digital VTR. - There is a method of generating and recording errors and comparing the reproduced data sound pits during playback to count errors. With this method, the closing rate χ can be determined quantitatively, Kf411, but it requires a jig for measurement and cannot be measured in normal operation mode.

〔発明が・浮決しようとする問題点〕[Problems that the invention is trying to solve]

従来デジタルVTR等の誤り測定方法として植々の方法
が提案されていたが、いずれの方法も定量的な副定かで
きなかつたり、特別な測定治具を必要とする。あるいは
通常の動作モードでは511J定できないなどの問題点
があった。
Conventionally, various methods have been proposed as methods for measuring errors in digital VTRs, etc., but none of these methods allows quantitative sub-determination or requires special measurement jigs. Another problem is that 511J cannot be determined in the normal operation mode.

〔問題点を解決するための手段〕[Means for solving problems]

本発明は、誤り検出(訂正)符号により、再生時に誤り
検出(訂正)回路から発生されるエラーフラグχ計敢し
、この計数値からその再生データの誤り率を測定するよ
5にした誤り率測定方法である。
The present invention uses an error detection (correction) code to measure the error flag χ generated from the error detection (correction) circuit during reproduction, and measures the error rate of the reproduced data from this count value. This is a measurement method.

〔作用〕[Effect]

上述の方法によれば、デジタルVTR等の通常の動作モ
ード、すなわち一般の画像の画先時に、定量的に、しか
も測定のための余分なデータ・回路を必要としないで、
再生データの誤り4を測定する事ができ、これによって
、デジタルVTRの実際の使用時にも、誤り率による自
己診断機能、あるいは誤り軍の表示等も可能となる。あ
るいは記録・再生系の調整・点検等も8易で正確なもの
となる。
According to the above-mentioned method, in the normal operating mode of a digital VTR, etc., that is, in the case of a general image, quantitative measurements can be made without requiring any extra data or circuitry for measurement.
Errors 4 in reproduced data can be measured, thereby enabling a self-diagnosis function based on error rate or display of errors during actual use of the digital VTR. Also, adjustment and inspection of the recording/playback system will be easy and accurate.

〔実施例〕〔Example〕

一般にデジタルVTRでは、記録・再生の過程で発生す
る誤りに対して、検出・訂正等の処理なする。そのため
に記録系では、いくつかのサンプルをまとめてブロック
とし、これに対して誤り訂正符号あるいは誤り検出符号
を生成して記録する。
Generally, in a digital VTR, processing such as detection and correction is performed for errors occurring during the recording/reproducing process. To this end, the recording system collects several samples into a block, generates an error correction code or an error detection code for the block, and records the block.

再生系では、そのブロック内にその誤り検出符号の検出
nヒカを超えない誤りが存在するときには、それらを全
℃検出し、誤りの存在を指し示すフラグ(エラー・)2
グ)を発生する。
In the playback system, if there are errors within the block that do not exceed detection n of the error detection code, they are fully detected and a flag (error) 2 indicating the existence of the error is detected.
) occurs.

いま検出符号が、lサンプルMビット、1ブロツクへサ
ンプルで構成されているとすると、ビット誤り4 FE
Btt 、サンプル誤り”E Sample、ブロック
誤り4 PEBIoekの関係は以下の様になる。
Assuming that the detection code is composed of 1 sample and M bits and 1 block of samples, the bit error is 4 FE
The relationship between Btt, sample error "E Sample, and block error 4 PEBIoek is as follows.

PE8arnple = 1   (1’EB1t )
MPEBIack  = 1  (1−PE1−PE8
a )’十分多くのブロックL個中に個のブロック内に
誤りが存在してエラー・フラグが発生されたとすると、 PE B 1odc = K/L         ・
・・・・(υ従って、誤り検出回路で発生される工2−
・フラグを計数していれば、サンプル誤り率、ビット誤
り率を測定する事ができる。
PE8arnple = 1 (1'EB1t)
MPEBIack = 1 (1-PE1-PE8
a) 'If there is an error in a block out of a sufficiently large number of L blocks and an error flag is generated, then PE B 1odc = K/L ・
...(υTherefore, the work generated in the error detection circuit 2-
・If flags are counted, sample error rate and bit error rate can be measured.

なお、ここでは誤り検出符号から誤りを検出し工2−・
フラグが発生される場合について述べたが、誤り訂正符
号でも同様に訂正を行なう前に誤りを検出してエラー・
フラグを発生する。従ってそこに使われている符号の種
類は限定されない。
In addition, here, errors are detected from the error detection code and the process 2-.
We have described the case where a flag is generated, but error correction codes also detect errors and eliminate errors before making corrections.
Generates a flag. Therefore, the type of code used there is not limited.

あるいはその符号構成によっては、ブロック内の誤りで
はな(各サンプル個々の誤りの有無を検出する事ができ
る。この場合にはブロック誤り率((l)式)ではな(
、直接サンプル誤り率’t’ IIIIJ定す誤り訂正
回路の叱方を監視し、またビツト誤り率は記録・再生系
の状態を監視する寺、自己診断機能に利用する事ができ
る。
Alternatively, depending on the code structure, it is possible to detect whether there is an error in each sample (not an error within the block).
The bit error rate can be used for a self-diagnosis function to monitor the state of the recording/reproduction system.

さらに図は本発明の方法ぞ実現するための装置の一例の
ブロック図である。図において、テープ(1)から再生
されたデータは再生回路(3)でビット判別、ビット同
期、ブロック同期等の処理後、誤り訂正回路(4)へ送
られる。誤り訂正回路(4)では誤りの検出・訂正等の
処理をして出力回路(5)へ送る。
Furthermore, the figure is a block diagram of an example of an apparatus for implementing the method of the present invention. In the figure, data reproduced from a tape (1) is sent to an error correction circuit (4) after processing such as bit discrimination, bit synchronization, and block synchronization in a reproduction circuit (3). The error correction circuit (4) performs processing such as error detection and correction and sends the processed data to the output circuit (5).

このとき発生されるエラー・フラグは誤り計数回路(6
)で一定期間計数され、ブロック誤り率(1)式が測定
される。その計数結果は、演算回路(7)で(2)式、
(3)式等の演算を施こされ、表示装置(8)あるいは
シスコン・サーボ等へ送られる。
The error flag generated at this time is the error counter circuit (6
) is counted for a certain period of time, and the block error rate (1) is measured. The counting result is calculated by the arithmetic circuit (7) using the formula (2).
It is subjected to calculations such as equation (3), and sent to a display device (8), a system controller, servo, etc.

このようにして誤り率の測定を行うことがでる。In this way, the error rate can be measured.

〔発明の効果〕〔Effect of the invention〕

本発明によれば、通常の画像再生状態において、定j7
に的に再生データの誤り率を測定する事ができる。さら
に、測定のための特別な治具や機会を設定する事もな(
、また余分なデータや回路を附加する必要もない。
According to the present invention, in the normal image reproduction state, the constant j7
It is possible to directly measure the error rate of reproduced data. Furthermore, there is no need to set up special jigs or opportunities for measurement (
, and there is no need to add extra data or circuits.

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

図は本発明の方法を実現するための装置の一例の溝成図
である。 (1)はテープ、(2)はヘッド、(3)は再生回路、
(4)は誤り訂正回路、(5)は出力回路、(6)は誤
り計数回路、(7)は演算回路、(8)は表示装置であ
る。 ク                δ=45:
The figure is a schematic diagram of an example of a device for implementing the method of the present invention. (1) is the tape, (2) is the head, (3) is the playback circuit,
(4) is an error correction circuit, (5) is an output circuit, (6) is an error counting circuit, (7) is an arithmetic circuit, and (8) is a display device. δ=45:

Claims (1)

【特許請求の範囲】[Claims] 誤り検出(訂正)符号により、再生時に誤り検出(訂正
)回路から発生されるエラーフラグを計数し、この計数
値からその再生データの誤り率を測定するようにした誤
り率測定方法。
An error rate measuring method in which error flags generated from an error detection (correction) circuit during reproduction are counted using an error detection (correction) code, and the error rate of the reproduced data is measured from this counted value.
JP59221582A 1984-10-22 1984-10-22 Error rate measuring method Pending JPS61104371A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59221582A JPS61104371A (en) 1984-10-22 1984-10-22 Error rate measuring method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59221582A JPS61104371A (en) 1984-10-22 1984-10-22 Error rate measuring method

Publications (1)

Publication Number Publication Date
JPS61104371A true JPS61104371A (en) 1986-05-22

Family

ID=16768998

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59221582A Pending JPS61104371A (en) 1984-10-22 1984-10-22 Error rate measuring method

Country Status (1)

Country Link
JP (1) JPS61104371A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63231773A (en) * 1987-03-20 1988-09-27 Victor Co Of Japan Ltd Rotary head type digital signal recording and reproducing device
EP0381208A2 (en) * 1989-02-03 1990-08-08 Deutsche Thomson-Brandt GmbH Device for digital recording and reproducing of audio or video signals
EP0491327A2 (en) * 1990-12-19 1992-06-24 Gigatape Systeme Fuer Datensicherung Gmbh Data protection method
US5757048A (en) * 1992-06-24 1998-05-26 Seiko Epson Corporation Thin film transistor, solid state device, display device and manufacturing method of a thin film transistor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5673939A (en) * 1979-11-21 1981-06-19 Sony Corp Error signal processor
JPS5749794B2 (en) * 1974-11-10 1982-10-23

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5749794B2 (en) * 1974-11-10 1982-10-23
JPS5673939A (en) * 1979-11-21 1981-06-19 Sony Corp Error signal processor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63231773A (en) * 1987-03-20 1988-09-27 Victor Co Of Japan Ltd Rotary head type digital signal recording and reproducing device
EP0381208A2 (en) * 1989-02-03 1990-08-08 Deutsche Thomson-Brandt GmbH Device for digital recording and reproducing of audio or video signals
EP0491327A2 (en) * 1990-12-19 1992-06-24 Gigatape Systeme Fuer Datensicherung Gmbh Data protection method
EP0491327A3 (en) * 1990-12-19 1992-09-16 Gigatape Systeme Fuer Datensicherung Gmbh Data protection method
US5757048A (en) * 1992-06-24 1998-05-26 Seiko Epson Corporation Thin film transistor, solid state device, display device and manufacturing method of a thin film transistor

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