JPH07154769A - Catv transmission line frequency characteristic deviation measuring instrument - Google Patents
Catv transmission line frequency characteristic deviation measuring instrumentInfo
- Publication number
- JPH07154769A JPH07154769A JP5295837A JP29583793A JPH07154769A JP H07154769 A JPH07154769 A JP H07154769A JP 5295837 A JP5295837 A JP 5295837A JP 29583793 A JP29583793 A JP 29583793A JP H07154769 A JPH07154769 A JP H07154769A
- Authority
- JP
- Japan
- Prior art keywords
- test signal
- signal
- frequency characteristic
- frequency
- transmission line
- 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.)
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Links
Landscapes
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はＣＡＴＶ伝送路周波数特
性偏差測定装置に関し、特に複数の信号を合成して伝送
路へ送出するヘッドエンド装置の周波数特性と伝送路機
器の出力までの周波数特性との偏差を測定するＣＡＴＶ
伝送路周波数特性偏差測定装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CATV transmission line frequency characteristic deviation measuring device, and more particularly, to a frequency characteristic of a head end device for synthesizing a plurality of signals and sending out to a transmission line and a frequency characteristic up to the output of a transmission line device. CATV to measure the deviation of
The present invention relates to a transmission line frequency characteristic deviation measuring device.
【０００２】[0002]
【従来の技術】ＣＡＴＶ伝送路の増設等に際して、新設
する伝送路機器、例えば中継増幅器の調整を行う場合、
ヘッドエンド装置の周波数特性と新設中継増幅器の出力
までの周波数特性との偏差を測定し、この周波数特性偏
差が規格内に収まるように新設中継増幅器を調整してい
る。2. Description of the Related Art When a CATV transmission line is to be added, a new transmission line device, for example, a relay amplifier is adjusted,
The deviation between the frequency characteristic of the headend device and the frequency characteristic up to the output of the new relay amplifier is measured, and the new relay amplifier is adjusted so that this frequency characteristic deviation falls within the standard.
【０００３】従来、周波数特性偏差を測定する場合は新
設中継増幅器の出力側において、ヘッドエンド装置側か
ら送出されている特定周波数のパイロット信号のレベル
を測定したり、あるいは、サービス中のテレビ信号の搬
送波レベルを測定している。Conventionally, when measuring the frequency characteristic deviation, the level of a pilot signal of a specific frequency sent from the headend device side is measured at the output side of a new relay amplifier, or the TV signal in service is Measuring carrier level.
【０００４】[0004]
【発明が解決しようとする課題】上述したように従来
は、新規中継増幅器の出力側においてパイロット信号や
サービス中のテレビ信号の映像搬送波レベルを測定して
いる。しかし、パイロット信号の周波数は固定されてお
り、また、テレビ信号は伝送帯域全体に亘ってサービス
されておらず、更に、テレビ信号は変調により測定レベ
ルが変動するので、一連性のある伝送帯域全般の周波数
特性偏差を精度よく測定することができないという問題
点を有している。As described above, conventionally, the video carrier level of the pilot signal or the television signal in service is measured at the output side of the novel relay amplifier. However, the frequency of the pilot signal is fixed, the television signal is not serviced over the entire transmission band, and the measurement level of the television signal fluctuates due to modulation. However, there is a problem that the frequency characteristic deviation cannot be measured accurately.
【０００５】本発明の目的は、伝送帯域全般の周波数特
性偏差を自動的に精度よく測定できるＣＡＴＶ伝送路周
波数特性偏差測定装置を提供することにある。An object of the present invention is to provide a CATV transmission line frequency characteristic deviation measuring device capable of automatically and accurately measuring the frequency characteristic deviation of the entire transmission band.
【０００６】[0006]
【課題を解決するための手段】本発明のＣＡＴＶ伝送路
周波数特性偏差測定装置は、複数の信号を合成して伝送
路へ送出するヘッドエンド装置の周波数特性と伝送路機
器の出力までの周波数特性との偏差を測定するＣＡＴＶ
伝送路周波数特性偏差測定装置であって、テスト信号を
生成して前記ヘッドエンド装置へ出力するテスト信号送
信器と、前記伝送路機器の出力信号から前記テスト信号
を検出して前記ＣＡＴＶ伝送路周波数特性偏差を出力す
るテスト信号受信器とを備え、前記テスト信号送信器
は、前記テスト信号を、ＣＡＴＶ下り方向の各チャンネ
ルのガードバンド内に挿入しながら伝送帯域全般に亘り
一定時間間隔で順次送出するように構成されている。A CATV transmission line frequency characteristic deviation measuring apparatus according to the present invention is a frequency characteristic of a headend device that synthesizes a plurality of signals and sends out to a transmission line and a frequency characteristic up to the output of a transmission line device. CATV to measure the deviation from
A transmission line frequency characteristic deviation measuring device, comprising: a test signal transmitter for generating a test signal and outputting it to the headend device; and a CATV transmission line frequency for detecting the test signal from an output signal of the transmission line device. A test signal receiver that outputs a characteristic deviation, wherein the test signal transmitter sequentially transmits the test signal at a constant time interval over the entire transmission band while inserting the test signal into the guard band of each channel in the CATV downlink direction. Is configured to.
【０００７】また、前記テスト信号送信器は、前記テス
ト信号の周波数および送出周期等の信号情報を生成する
信号情報生成部と、前記信号情報を前記テスト信号に付
加する信号情報付加部とを有し、前記テスト信号受信器
は、前記テスト信号の受信レベルを測定するレベル測定
部と、前記テスト信号に付加されている前記信号情報を
抽出する信号情報抽出部と、前記ヘッドエンド装置の周
波数特性を基準データとして記憶する基準データメモリ
と、前記レベル測定部が測定した前記テスト信号の受信
レベルおよび前記信号情報抽出部が抽出した前記信号情
報並びに前記基準データメモリが予め記憶している基準
データに基づき前記ＣＡＴＶ伝送路周波数特性偏差を求
めるデータ処理部とを有している。Further, the test signal transmitter has a signal information generating section for generating signal information such as frequency and transmission period of the test signal, and a signal information adding section for adding the signal information to the test signal. The test signal receiver includes a level measurement unit that measures a reception level of the test signal, a signal information extraction unit that extracts the signal information added to the test signal, and a frequency characteristic of the headend device. A reference data memory for storing as reference data, a reception level of the test signal measured by the level measuring unit, the signal information extracted by the signal information extracting unit, and the reference data stored in the reference data memory in advance. And a data processing unit for obtaining the CATV transmission line frequency characteristic deviation based on the above.
【０００８】[0008]
【実施例】次に本発明について図面を参照して説明す
る。The present invention will be described below with reference to the drawings.
【０００９】図１は本発明の一実施例を示すブロック図
である。ここでは、ヘッドエンド装置３から中継増幅器
４ｃまでの伝送路の周波数特性偏差を測定する場合を示
しており、ヘッドエンド装置３の信号入力端子の一つに
接続するテスト信号送信器１と、中継増幅器４ｃの出力
モニタ端子４１に接続するテスト信号受信器２とからな
っている。FIG. 1 is a block diagram showing an embodiment of the present invention. Here, the case where the frequency characteristic deviation of the transmission line from the headend device 3 to the relay amplifier 4c is measured is shown, and the test signal transmitter 1 connected to one of the signal input terminals of the headend device 3 and the relay The test signal receiver 2 is connected to the output monitor terminal 41 of the amplifier 4c.
【００１０】なお、ヘッドエンド装置３は、複数のテレ
ビ信号（ｃｈ１〜ｃｈｎ）およびテスト信号送信器１か
らのテスト信号Ｓｔ１をそれぞれ受けて合成し伝送路５
へ送出する。また、中継増幅器４ａ〜４ｃは、ヘッドエ
ンド装置３が送出した信号を伝送路を介して受信し、増
幅した後、分配もしくは分岐する。The head-end device 3 receives and synthesizes a plurality of television signals (ch1 to chn) and the test signal St1 from the test signal transmitter 1, respectively, and combines them into the transmission line 5.
Send to. Further, the relay amplifiers 4a to 4c receive the signal transmitted from the headend device 3 via the transmission path, amplify the signal, and then distribute or branch the signal.
【００１１】さて、テスト信号送信器１は、伝送路の周
波数特性偏差を測定するためのテスト信号Ｓｔ１を生成
する。ここで、周波数発生部１１は、制御信号Ｃ１１に
よって指定される周波数の信号Ｓｃを所定のタイミング
で発生する。信号情報生成部１２は、テスト信号Ｓｔ１
の周波数や送出周期等の信号情報Ｄ１を制御信号Ｃ１２
に応じて生成する。信号情報付加部１３は、信号Ｓｃに
信号情報Ｄ１を付加してテスト信号Ｓｔ１を生成する。
信号制御部１４は、制御信号Ｃ１１，Ｃ１２を出力す
る。Now, the test signal transmitter 1 generates a test signal St1 for measuring the frequency characteristic deviation of the transmission line. Here, the frequency generator 11 generates a signal Sc having a frequency designated by the control signal C11 at a predetermined timing. The signal information generator 12 receives the test signal St1.
Of the signal information D1 such as the frequency and the transmission cycle of the control signal C12
Generate according to. The signal information adding unit 13 adds the signal information D1 to the signal Sc to generate the test signal St1.
The signal controller 14 outputs the control signals C11 and C12.
【００１２】ところで、テスト信号Ｓｔ１は、ＣＡＴＶ
下り方向の各チャンネルのガードバンド内に挿入され、
低い周波数のチャンネルから高い周波数のチャンネルへ
と伝送帯域全般に亘り一定時間間隔で順次変化する。例
えば、ＮＴＳＣ方式においては、テスト信号Ｓｔ１の出
力周波数、すなわち信号Ｓｃの周波数は、図２に示すよ
うに、映像搬送波周波数よりも１．２５ＭＨｚ低いガー
ドバンド内の周波数に設定される。また、テスト信号Ｓ
ｔ１の出力レベルは、他のテレビ信号よりも約１０ｄＢ
程度低いレベルに設定する。このようにすることによ
り、テスト信号Ｓｔ１がサービス中のテレビ信号ｃｈ１
〜ｃｈｎに障害を与えるのを防止できる。By the way, the test signal St1 is
Inserted in the guard band of each channel in the down direction,
It changes sequentially from the low frequency channel to the high frequency channel at constant time intervals over the entire transmission band. For example, in the NTSC system, the output frequency of the test signal St1, that is, the frequency of the signal Sc is set to a frequency within the guard band that is 1.25 MHz lower than the video carrier frequency, as shown in FIG. Also, the test signal S
The output level of t1 is about 10 dB higher than other TV signals.
Set to a low level. By doing so, the test signal St1 is transmitted to the television signal ch1 in service.
It is possible to prevent ~ chn from being damaged.
【００１３】テスト信号受信器２は、中継増幅器４ｃの
出力モニタ端子４１に接続してテスト信号送信器１が送
出したテスト信号を受信して伝送路の周波数特性偏差を
測定する。なお事前に、ヘッドエンド装置３の周波数特
性を基準データメモリ２６に記憶させておく。このた
め、例えば、ヘッドエンド装置３の出力モニタ端子（図
示せず）にテスト信号受信器２を接続し、テスト信号送
信器１を動作させてヘッドエンド装置３の周波数特性を
測定し、この測定値を基準データとして基準データメモ
リ２６に記憶させる。The test signal receiver 2 is connected to the output monitor terminal 41 of the relay amplifier 4c, receives the test signal sent from the test signal transmitter 1 and measures the frequency characteristic deviation of the transmission line. The frequency characteristics of the headend device 3 are stored in the reference data memory 26 in advance. Therefore, for example, the test signal receiver 2 is connected to the output monitor terminal (not shown) of the headend device 3, the test signal transmitter 1 is operated, and the frequency characteristic of the headend device 3 is measured. The value is stored in the reference data memory 26 as reference data.
【００１４】さて、テスト信号検出部２１は、受信信号
からテスト信号Ｓｔ２を検出する。レベル測定部２２
は、測定タイミング信号Ｃ２１に応じて、テスト信号Ｓ
ｔ２の信号レベルを測定してレベル測定データＤ２とし
て出力する。信号情報抽出部２３は、テスト信号Ｓｔ２
に付加されている信号情報Ｄ１を検出する。測定制御部
２４は、信号情報Ｄ１の送出周期情報に基づき測定タイ
ミング信号Ｃ２１を生成すると共に、信号情報Ｄ１から
テスト信号の周波数を示す情報Ｄ３を抽出してデータ処
理部２５へ出力する。The test signal detector 21 detects the test signal St2 from the received signal. Level measuring unit 22
Represents the test signal S in response to the measurement timing signal C21.
The signal level at t2 is measured and output as level measurement data D2. The signal information extraction unit 23 uses the test signal St2.
The signal information D1 added to is detected. The measurement control unit 24 generates the measurement timing signal C21 based on the transmission cycle information of the signal information D1, extracts the information D3 indicating the frequency of the test signal from the signal information D1, and outputs the information D3 to the data processing unit 25.
【００１５】データ処理部２５は、レベル測定データＤ
２および周波数情報Ｄ３から中継増幅器４ｃの出力にお
ける周波数特性を求める。この際に、出力モニタ端子に
おけるレベル誤差の補正を必要に応じて行う。更に、基
準データメモリ２６に予め記憶されている基準データＤ
４と比較して、その差分からＣＡＴＶ伝送路周波数特性
偏差を求め、表あるいはグラフ化してディスプレイ２７
に表示させると共に、必要に応じてプリンタ２８にプリ
ントアウトさせる。The data processing unit 25 uses the level measurement data D
2 and the frequency information D3, the frequency characteristic at the output of the relay amplifier 4c is obtained. At this time, the level error at the output monitor terminal is corrected as necessary. Further, the reference data D previously stored in the reference data memory 26
4, the CATV transmission line frequency characteristic deviation is calculated from the difference, and is displayed in a table or a graph on the display 27.
And the printer 28 prints out if necessary.
【００１６】中継増幅器４ｃの調整を行う作業者は、デ
ィスプレイ２７に表示される周波数特性偏差を見ながら
規格内に収まるように調整する。An operator who adjusts the relay amplifier 4c adjusts it so that it falls within the standard while observing the frequency characteristic deviation displayed on the display 27.
【００１７】[0017]
【発明の効果】以上説明したように本発明によれば、ヘ
ッドエンド装置から送出するテスト信号を、ＣＡＴＶ下
り方向の各チャンネルのガードバンド内に設定し、伝送
帯域全般に亘り一定時間間隔で順次変化させることによ
り、サービス中のテレビ信号に障害を与えることなく、
伝送帯域全般の周波数特性偏差を自動的に精度よく測定
できる。As described above, according to the present invention, the test signal transmitted from the headend device is set in the guard band of each channel in the CATV downstream direction, and the test signals are sequentially set at constant time intervals over the entire transmission band. By changing, without disturbing the TV signal in service,
The frequency characteristic deviation of the entire transmission band can be measured automatically and accurately.
【００１８】また、テスト信号の周波数および送出周期
等の信号情報をテスト信号に付加することにより、測定
精度を向上できる。Further, by adding signal information such as the frequency and transmission cycle of the test signal to the test signal, the measurement accuracy can be improved.
【図１】本発明の一実施例を示すブロック図である。FIG. 1 is a block diagram showing an embodiment of the present invention.
【図２】図１に示したテスト信号Ｓｔ１を説明するため
の図である。FIG. 2 is a diagram for explaining a test signal St1 shown in FIG.
１ テスト信号送信器 ２ テスト信号受信器 ３ ヘッドエンド装置 ４ａ〜４ｃ 中継増幅器 １１ 周波数発生部 １２ 信号情報生成部 １３ 信号情報付加部 １４ 信号制御部 ２１ テスト信号検出部 ２２ レベル測定部 ２３ 信号情報抽出部 ２４ 測定制御部 ２５ データ処理部 ２６ 基準データメモリ Ｄ１ 信号情報 Ｄ２ レベル測定データ Ｄ３ 周波数情報 Ｄ４ 基準データ Ｓｔ１，Ｓｔ２ テスト信号 DESCRIPTION OF SYMBOLS 1 test signal transmitter 2 test signal receiver 3 headend device 4a-4c relay amplifier 11 frequency generation part 12 signal information generation part 13 signal information addition part 14 signal control part 21 test signal detection part 22 level measurement part 23 signal information extraction Section 24 measurement control section 25 data processing section 26 reference data memory D1 signal information D2 level measurement data D3 frequency information D4 reference data St1, St2 test signal
Claims (2)
ヘッドエンド装置の周波数特性と伝送路機器の出力まで
の周波数特性との偏差を測定するＣＡＴＶ伝送路周波数
特性偏差測定装置であって、テスト信号を生成して前記
ヘッドエンド装置へ出力するテスト信号送信器と、前記
伝送路機器の出力信号から前記テスト信号を検出して前
記ＣＡＴＶ伝送路周波数特性偏差を出力するテスト信号
受信器とを備え、前記テスト信号送信器は、前記テスト
信号を、ＣＡＴＶ下り方向の各チャンネルのガードバン
ド内に挿入しながら伝送帯域全般に亘り一定時間間隔で
順次送出することを特徴とするＣＡＴＶ伝送路周波数特
性偏差測定装置。1. A CATV transmission line frequency characteristic deviation measuring device for measuring a deviation between a frequency characteristic of a headend device for synthesizing a plurality of signals and sending it to a transmission line and a frequency characteristic up to an output of a transmission line device. A test signal transmitter that generates a test signal and outputs the test signal to the headend device; and a test signal receiver that detects the test signal from the output signal of the transmission path device and outputs the CATV transmission path frequency characteristic deviation. The CATV transmission line frequency, wherein the test signal transmitter sequentially transmits the test signal at a constant time interval over the entire transmission band while inserting the test signal into the guard band of each channel in the CATV downlink direction. Characteristic deviation measuring device.
号の周波数および送出周期等の信号情報を生成する信号
情報生成部と、前記信号情報を前記テスト信号に付加す
る信号情報付加部とを有し、 前記テスト信号受信器は、前記テスト信号の受信レベル
を測定するレベル測定部と、前記テスト信号に付加され
ている前記信号情報を抽出する信号情報抽出部と、前記
ヘッドエンド装置の周波数特性を基準データとして記憶
する基準データメモリと、前記レベル測定部が測定した
前記テスト信号の受信レベルおよび前記信号情報抽出部
が抽出した前記信号情報並びに前記基準データメモリが
予め記憶している基準データに基づき前記ＣＡＴＶ伝送
路周波数特性偏差を求めるデータ処理部とを有している
ことを特徴とする請求項１記載のＣＡＴＶ伝送路周波数
特性偏差測定装置。2. The test signal transmitter includes a signal information generation unit that generates signal information such as a frequency and a transmission cycle of the test signal, and a signal information addition unit that adds the signal information to the test signal. However, the test signal receiver is a level measurement unit that measures a reception level of the test signal, a signal information extraction unit that extracts the signal information added to the test signal, and a frequency characteristic of the headend device. A reference data memory for storing as reference data, a reception level of the test signal measured by the level measuring unit, the signal information extracted by the signal information extracting unit, and the reference data stored in the reference data memory in advance. 2. A CATV transmission according to claim 1, further comprising a data processing section for obtaining the frequency characteristic deviation of the CATV transmission line based on the data processing section. Road frequency characteristic deviation measuring device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05295837A JP3123866B2 (en) | 1993-11-26 | 1993-11-26 | CATV transmission line frequency characteristic deviation measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05295837A JP3123866B2 (en) | 1993-11-26 | 1993-11-26 | CATV transmission line frequency characteristic deviation measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07154769A true JPH07154769A (en) | 1995-06-16 |
| JP3123866B2 JP3123866B2 (en) | 2001-01-15 |
Family
ID=17825830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05295837A Expired - Lifetime JP3123866B2 (en) | 1993-11-26 | 1993-11-26 | CATV transmission line frequency characteristic deviation measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3123866B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007043655A (en) * | 2005-06-29 | 2007-02-15 | Ntt Docomo Inc | Video evaluation apparatus, method, and program, and spatio-temporal frequency analyzing apparatus, method, and program |
| JP2011199768A (en) * | 2010-03-23 | 2011-10-06 | Dx Antenna Co Ltd | Diagnosic system for joint receiving system |
-
1993
- 1993-11-26 JP JP05295837A patent/JP3123866B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007043655A (en) * | 2005-06-29 | 2007-02-15 | Ntt Docomo Inc | Video evaluation apparatus, method, and program, and spatio-temporal frequency analyzing apparatus, method, and program |
| US8064638B2 (en) | 2005-06-29 | 2011-11-22 | Ntt Docomo, Inc. | Video evaluation apparatus, spatio-temporal frequency analyzing apparatus, video evaluation method, spatio-temporal frequency analyzing method, video evaluation program, and spatio-temporal frequency analyzing program |
| US8462985B2 (en) | 2005-06-29 | 2013-06-11 | Ntt Docomo, Inc. | Video evaluation apparatus, spatio-temporal frequency analyzing apparatus, video evaluation method, spatio-temporal frequency analyzing method, video evaluation program, and spatio-temporal frequency analyzing program |
| JP2011199768A (en) * | 2010-03-23 | 2011-10-06 | Dx Antenna Co Ltd | Diagnosic system for joint receiving system |
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