JP2723814B2 - Frequency measurement device - Google Patents
Frequency measurement deviceInfo
- Publication number
- JP2723814B2 JP2723814B2 JP3822895A JP3822895A JP2723814B2 JP 2723814 B2 JP2723814 B2 JP 2723814B2 JP 3822895 A JP3822895 A JP 3822895A JP 3822895 A JP3822895 A JP 3822895A JP 2723814 B2 JP2723814 B2 JP 2723814B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- frequency
- horizontal synchronization
- standard signal
- frequency measurement
- 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.)
- Expired - Lifetime
Links
Landscapes
- Measuring Frequencies, Analyzing Spectra (AREA)
- Synchronizing For Television (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は周波数計測装置に関し、
特に高精度の標準信号により高精度の測定を行う周波数
計測装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frequency measuring device,
In particular, the present invention relates to a frequency measurement device that performs high-accuracy measurement using a high-accuracy standard signal.
【０００２】[0002]
【従来の技術】従来の周波数計測装置は、水晶振動子に
より標準信号を発生し、この標準信号に基づいて周波数
を測定している。従って、測定精度を上げるためには水
晶振動子の周波数精度および安定度を向上させる必要が
ある。水晶振動子は周囲温度の影響を受けるため、事前
に長時間のエージングを行い、恒温槽に収納して一定温
度に保って使用している。2. Description of the Related Art A conventional frequency measuring apparatus generates a standard signal by a quartz oscillator and measures a frequency based on the standard signal. Therefore, in order to increase the measurement accuracy, it is necessary to improve the frequency accuracy and stability of the crystal unit. Since the crystal unit is affected by the ambient temperature, it is aged for a long time in advance, stored in a thermostat, and used at a constant temperature.
【０００３】[0003]
【発明が解決しようとする課題】上述した従来の周波数
計測装置では、水晶振動子により標準信号を発生してい
るので、標準信号が所定の精度および安定状態になるま
でにエージング時間を要し、装置に電源を投入してから
測定可能状態になるまで待たなくてはならない。また、
装置を測定可能状態にしておくためには、恒温槽および
水晶発振回路に常に通電しておく必要があり、可搬性に
問題点がある。In the conventional frequency measuring apparatus described above, since the standard signal is generated by the crystal oscillator, it takes an aging time for the standard signal to reach a predetermined accuracy and a stable state. You must wait until the instrument is turned on and ready for measurement. Also,
In order to keep the device in a measurable state, it is necessary to always supply power to the constant temperature bath and the crystal oscillation circuit, and there is a problem in portability.
【０００４】本発明の目的は、装置に電源投入後、直ち
に高精度、高安定な標準信号を発生して測定開始できる
周波数計測装置を提供することにある。[0004] It is an object of the present invention to provide a frequency measuring apparatus capable of generating a high-accuracy and high-stability standard signal and starting measurement immediately after power-on of the apparatus.
【０００５】[0005]
【課題を解決するための手段】本発明の周波数計測装置
は、カラーＴＶ放送電波を受信してＴＶ映像信号を復調
する受信手段と、前記ＴＶ映像信号から水平同期信号を
抽出して水平同期周波数の信号を出力する水平同期抽出
手段と、前記水平同期周波数の信号を受けて所定周波数
の標準信号を生成する位相同期ループと、前記標準信号
に基づき周波数測定を行う周波数計測手段とを備える。A frequency measuring apparatus according to the present invention comprises: a receiving means for receiving a color TV broadcast wave and demodulating a TV video signal; and extracting a horizontal synchronizing signal from the TV video signal to obtain a horizontal synchronizing frequency. And a phase synchronization loop for receiving a signal of the horizontal synchronization frequency to generate a standard signal of a predetermined frequency, and a frequency measurement unit for performing frequency measurement based on the standard signal.
【０００６】[0006]
【実施例】次に本発明について図面を参照して説明す
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.
【０００７】図１は本発明の一実施例を示すブロック図
であり、カラーＴＶ放送電波を受信するアンテナ１と、
受信したカラーＴＶ放送電波から所定チャンネルのＴＶ
映像信号を復調するＴＶチューナ２と、ＴＶ映像信号か
ら水平同期信号を抽出して水平同期周波数ｆｈの信号Ｓ
ｈを出力する水平同期抽出部３と、信号Ｓｈに基づいて
所定周波数の標準信号Ｓｒを生成する位相同期ループ４
と、標準信号Ｓｒに含まれる不要信号成分を除去するフ
ィルタ５と、標準信号Ｓｒに基づき周波数測定を行う周
波数計測部６とを備えている。FIG. 1 is a block diagram showing an embodiment of the present invention, in which an antenna 1 for receiving a color TV broadcast wave,
From the received color TV broadcast radio wave,
A TV tuner 2 for demodulating a video signal, and extracting a horizontal synchronization signal from the TV video signal to generate a signal S having a horizontal synchronization frequency fh.
h and a phase locked loop 4 for generating a standard signal Sr of a predetermined frequency based on the signal Sh.
A filter 5 for removing unnecessary signal components included in the standard signal Sr; and a frequency measuring unit 6 for performing frequency measurement based on the standard signal Sr.
【０００８】ところでＮＴＳＣカラーＴＶ信号では、水
平同期周波数のｆｈとし、色副搬送波周波数ｆｓｃとす
れば、ｆｈ＝ｆｓｃ×（２／４５５）＝９／５７２ Ｍ
Ｈｚとなっており、周波数精度は１０ＭＨｚに対して１
×１０-11 程度であって高精度、高安定である。従っ
て、このようなカラーＴＶ信号の水平同期信号を活用す
ることにより、高精度、高安定の標準信号を得ることが
できる。By the way, in the NTSC color TV signal, if the horizontal synchronizing frequency is fh and the color subcarrier frequency is fsc, fh = fsc × (2/455) = 9/572 M
Hz, and the frequency accuracy is 1 for 10 MHz.
High accuracy and high stability, about × 10-11. Therefore, by utilizing such a horizontal synchronizing signal of the color TV signal, it is possible to obtain a highly accurate and stable standard signal.
【０００９】すなわち、ＴＶチューナ２によりカラーＴ
Ｖ放送電波を受信復調してＴＶ映像信号を復調し、水平
同期抽出部３によりＴＶ映像信号から水平同期信号を抽
出して水平同期周波数ｆｈの信号Ｓｈを生成し、位相同
期ループ４により信号Ｓｈに基づいて所定周波数（例え
ば、１０ＭＨｚ）の標準信号を生成し、狭帯域のフィル
タ５により不要信号成分を除去し、周波数測定用の高精
度、高安定な標準信号Ｓｒを生成する。That is, the color T by the TV tuner 2
A V broadcast wave is received and demodulated to demodulate a TV video signal, a horizontal synchronization signal is extracted from the TV video signal by a horizontal synchronization extraction unit 3 to generate a signal Sh having a horizontal synchronization frequency fh, and a signal Sh is output by a phase synchronization loop 4. , A standard signal of a predetermined frequency (for example, 10 MHz) is generated, an unnecessary signal component is removed by a narrow band filter 5, and a highly accurate and stable standard signal Sr for frequency measurement is generated.
【００１０】なお、位相同期ループ４は、図示しないＶ
ＣＯ、位相比較回路、分周回路等からなる周知の回路で
構成できる。また、アンテナ１としては電源コードを利
用し、例えば図２に示すように、電源コードからＴＶ信
号フィルタを介してＴＶチューナ２の入力端子へ接続し
てＴＶ電波を受信するようにすれば、装置の可搬性を良
くすることができる。The phase-locked loop 4 has a V (not shown)
It can be configured by a well-known circuit including a CO, a phase comparison circuit, a frequency dividing circuit, and the like. If a power cord is used as the antenna 1 and, for example, as shown in FIG. 2, the power cord is connected to the input terminal of the TV tuner 2 via a TV signal filter to receive TV radio waves, Can be improved in portability.
【００１１】[0011]
【発明の効果】以上説明したように本発明によれば、カ
ラーＴＶ放送電波を受信して水平同期信号を抽出し、水
平同期周波数の信号に基づき所定周波数の標準信号を生
成することにより、従来のような水晶発振子を使用する
ことなく高精度、高安定な標準信号を発生できる。従っ
て、安定状態にするためのエージングの必要はなく、あ
るいは常に通電しておく必要はなく、装置に電源を投入
すると同時に高精度の測定が可能となり、また、可搬性
の良い装置を実現できるという効果を有している。As described above, according to the present invention, a color TV broadcast wave is received, a horizontal synchronizing signal is extracted, and a standard signal of a predetermined frequency is generated based on the signal of the horizontal synchronizing frequency. A highly accurate and stable standard signal can be generated without using a crystal oscillator such as that described above. Therefore, it is not necessary to perform aging for achieving a stable state, or it is not necessary to keep the power on at all times, and it is possible to perform high-precision measurement at the same time when power is supplied to the apparatus, and to realize a highly portable apparatus. Has an effect.
【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 one embodiment of the present invention.
【図２】図１に示したアンテナ１の一例を示す図であ
る。FIG. 2 is a diagram showing an example of the antenna 1 shown in FIG.
１ アンテナ ２ ＴＶチューナ ３ 水平同期抽出部 ４ 位相同期ループ ５ フィルタ ６ 周波数計測部 Ｓｈ 水平同期周波数の信号 Ｓｒ 標準信号 REFERENCE SIGNS LIST 1 antenna 2 TV tuner 3 horizontal synchronization extraction unit 4 phase locked loop 5 filter 6 frequency measurement unit Sh horizontal synchronization frequency signal Sr standard signal
Claims (1)
信号を復調する受信手段と、前記ＴＶ映像信号から水平
同期信号を抽出して水平同期周波数の信号を出力する水
平同期抽出手段と、前記水平同期周波数の信号を受けて
所定周波数の標準信号を生成する位相同期ループと、前
記標準信号に基づき周波数測定を行う周波数計測手段と
を備えることを特徴とする周波数計測装置。A receiving means for receiving a color TV broadcast wave and demodulating a TV video signal; a horizontal synchronization extracting means for extracting a horizontal synchronization signal from the TV video signal and outputting a signal of a horizontal synchronization frequency; A frequency measuring apparatus comprising: a phase-locked loop that receives a signal of a horizontal synchronization frequency to generate a standard signal of a predetermined frequency; and a frequency measurement unit that performs frequency measurement based on the standard signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3822895A JP2723814B2 (en) | 1995-02-27 | 1995-02-27 | Frequency measurement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3822895A JP2723814B2 (en) | 1995-02-27 | 1995-02-27 | Frequency measurement device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08233874A JPH08233874A (en) | 1996-09-13 |
| JP2723814B2 true JP2723814B2 (en) | 1998-03-09 |
Family
ID=12519459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3822895A Expired - Lifetime JP2723814B2 (en) | 1995-02-27 | 1995-02-27 | Frequency measurement device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2723814B2 (en) |
-
1995
- 1995-02-27 JP JP3822895A patent/JP2723814B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08233874A (en) | 1996-09-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19971111 |