JPS5917171A - Residual noise measuring device - Google Patents
Residual noise measuring deviceInfo
- Publication number
- JPS5917171A JPS5917171A JP12616582A JP12616582A JPS5917171A JP S5917171 A JPS5917171 A JP S5917171A JP 12616582 A JP12616582 A JP 12616582A JP 12616582 A JP12616582 A JP 12616582A JP S5917171 A JPS5917171 A JP S5917171A
- Authority
- JP
- Japan
- Prior art keywords
- detectors
- residual noise
- noise
- signal generator
- voltages
- 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
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/26—Measuring noise figure; Measuring signal-to-noise ratio
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Individual Semiconductor Devices (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、信号発生器に残留する雑音成分を測定するだ
めの残留雑音測定装置脩に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a residual noise measuring device for measuring noise components remaining in a signal generator.
一般に、ダニ信機等の信号対雑音比を測Ｗするにｄ、測
定に１ｖ′用する信号発生器を無変調にしたときに残留
しでいる残留雑音が受信機から発生する雑音に比べ、充
分小さくなっている必９がある。このため信号発生器の
残留雑音を測定することが必要となる場合がある。Generally, when measuring the signal-to-noise ratio of a tick transmitter etc., the residual noise that remains when the signal generator used for measurement is unmodulated is compared to the noise generated from the receiver. There must be 9 that is sufficiently small. Therefore, it may be necessary to measure the residual noise of the signal generator.
第１図は従来の残留雑音測定装置の一例のブロック図で
ある。FIG. 1 is a block diagram of an example of a conventional residual noise measuring device.
この残留雑音測定装置は、測定される信号発生器１に４
続される検波器２と実効値電圧計３とから構成される。This residual noise measuring device has a signal generator 1 to be measured.
It consists of a detector 2 and an effective value voltmeter 3 connected to each other.
このような構成にすることにより、信号発生器１を無変
調としたときの実効値電圧計３の指示と検波器２の固有
の検波効率より信号発生！５１の残留雑音を測定するこ
とができる。−！だ、測定条件によっては帯域フィルタ
が実効値電圧計３の前へ接続される場合もある。With this configuration, a signal can be generated from the indication of the effective value voltmeter 3 and the inherent detection efficiency of the detector 2 when the signal generator 1 is not modulated! 51 residual noise can be measured. -! However, depending on the measurement conditions, a bandpass filter may be connected before the effective value voltmeter 3.
第１図に示しだ構成の残留雑￥ｒＩｌｌＩｌｌ′Ｉｉｆ
器で、信号発生器１の残留雑音が測定できるたｄ）には
、検波器２から発生する雑音が充分小さく、信号発生器
１の残留雑音に対して無視できる竹度の大きさでなけれ
ばならないのはもちろんであるが、この条件は残留雑音
が極めて小さい信号発生器１の雑音を測定する場合には
、実現することが実用上困難であるという欠点があった
。Residual miscellaneous \rIllIll'Iif of the configuration shown in Figure 1
In order to be able to measure the residual noise of the signal generator 1 with a detector, the noise generated from the detector 2 must be sufficiently small and have a level that can be ignored compared to the residual noise of the signal generator 1. Of course, this condition has the disadvantage that it is difficult to achieve in practice when measuring the noise of the signal generator 1, which has extremely small residual noise.
本発明は上記欠点を除去し、雑音測定用の検波器から発
生する雑・音の影響を受けるとと々く、信号碌の残留雑
音を測定でさる残留竹音ｄｊｌｌ定装置を提供するもの
である。The present invention eliminates the above-mentioned drawbacks and provides a residual noise determination device that measures residual noise in a signal whenever it is affected by noise and sound generated from a detector for noise measurement. be.
本発明の残留雑音測定装置は、被測定信号源に接続する
少くとも３台の検波器と、該検波器のそれぞれの出力′
ｉｌｖ’、圧を測定する電圧計と、前’ｒ４ｒＪ、検波
器の出力１ｉ圧の差の電Ｉモを測定する雷、出射とを含
んで溝成される。The residual noise measuring device of the present invention includes at least three detectors connected to a signal source under test, and an output of each of the detectors.
ilv', a voltmeter that measures the pressure, and a lightning and an output that measure the voltage difference between the output 1i pressure of the detector and the output 1i of the detector.
本発明の実施例について図面を用いて討、明する。Embodiments of the present invention will be discussed and explained using the drawings.
第２図ＶＪ一本発明の一実施例のブロック図である。FIG. 2 is a block diagram of an embodiment of the present invention.
測定される信号発生器１にそれぞれ第１、第２、第３の
検波器４．５．６が接続され、第１、第２、第３の検波
器４，５．６の出力にはそれぞれ第１、第２、第３の実
効値電圧計の７．８．９が接続されている。第１、第２
の検波器４．５の出力間に第４の実効イ１へ電圧計１０
が接続され、第２、第３の検波器５．６の出力間に第５
の実効値電圧計１１が接続され、第３、第１の検波器６
．４の出力間に第０の実効値電圧Ｈ１１２が接続されて
いる。First, second, and third detectors 4.5.6 are connected to the signal generator 1 to be measured, respectively, and the outputs of the first, second, and third detectors 4,5.6 are connected to each other. The first, second, and third effective value voltmeters 7.8.9 are connected. 1st, 2nd
Between the outputs of the detector 4.5 and the 4th effective voltage meter 10
is connected between the outputs of the second and third detectors 5.6.
The effective value voltmeter 11 is connected, and the third and first detectors 6
．． A zeroth effective value voltage H112 is connected between the four outputs.
ここで、第１、第２、第３の検波器４．５．６の検波効
率には等しくなるよう設定する。−ヒう−１−ると、信
号発生器１の残留雑音による絢２＋支出力は、第１、ｂ
）２、第３の検波器４．５．６の検波効率が等し７いた
め、等しくｖｎと々る。第１、第２、第３の検波器４．
５．６から発生する剰Ｃ音をそノ１ぞれＶａ、 Ｖｂ、
Ｖｃと表わすと、第１、第２、第３の′ヲー÷効値電
圧計７．８．９の指示Ｖ１、■２、■３は次式で示され
る。Here, the detection efficiencies of the first, second, and third detectors 4.5.6 are set to be equal. −H−1− Then, the power 2+expenditure due to the residual noise of the signal generator 1 is the first, b
)2.Since the detection efficiencies of the third detectors 4, 5, and 6 are equal, vn is equally detected. First, second and third detectors4.
5. The residual C sound generated from 6 is Va, Vb, respectively.
When expressed as Vc, the first, second, and third 'W - ÷ indications V1, (2), and (3) of the effective value voltmeter 7.8.9 are expressed by the following equations.
Ｖｔ” 扉（Ｖｎ−＋−ｖａ）２
−−− Ｖｎ ＋Ｖａ ＋ ２Ｖｎ Ｖａミニ−■ｎ２
ト■ａ２・・・・・・・・・・・・・・・・・・・・・
・ ・ ・・ （１＋（°、°ＶｎとＶ、には相関かな
いため＼Ｉｎ Ｖ ａ −〇）同様に、
Ｖ２” ＝ Ｖｎ２＋Ｖ’ａ２・ ・・・ ・・
・ ・−・・・ ・・・ ・ ・ １７．
１ｖ３＝＝ Ｖｎ２＋ Ｖａ２ ・・・・・・・・・
・・・・・・・−・・・・・・（田また、各検波ｇＫ４
．５．６の出力の差箱、汁を１ｌｌｌ ＞、Ｍする第４
、第５、第６の実効ｆｉｇ、 ’Ｆ＃、圧ｉｔｌ １０
．１１１．１２％）ｍ ｗ Ｖｊ＊ Ｖｓ ｓ Ｖ６は
次式でカえら第１る。Vt” Door (Vn-+-va)2 --- Vn +Va + 2Vn Va mini-■n2
■a2・・・・・・・・・・・・・・・・・・
・ ・ ・ ・ (1 + (°, ° Since there is no correlation between Vn and V,\In V a −〇) Similarly, V2” = Vn2 + V'a2 ・ ・ ・
・ ・−・ ・ ・ ・ 17.
1v3== Vn2+ Va2 ・・・・・・・・・
・・・・・・・・・－・・・・・・(Tamata, each detection gK4
．． 5. Difference box with output of 6, 1lll of juice >, 4th to M
, 5th and 6th effective fig, 'F#, pressure itl 10
．． 111.12%) m w Vj* Vs s V6 is the first in the following equation.
＝ （■ａ−■ｂう２
＝ Ｖ ａ２＋ Ｖ ｂ２−２″ｖＶ′ｉ；＝ Ｖ
ａ”＋ Ｖ ｂ２・・・・・・・・・・・・・・・・
・・・・・・・・・・・・（４）（’、°Ｖ、 トＶｂ
Ｋは相１．ＫＩ カｉ イｆｒ−めν’；Ｖｂ＝ｏ）
同様に、
■５２ ”” Ｖｂ ＋Ｖ’ｃ”・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・（５）Ｖ６
” ＝ Ｖ ｃ’＋ Ｖ ａ”・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・（６）以
上よシ信号発生器１の残留Ｗ音による検波出力ｖｎが次
式（力〜（９）により求められる。= (■a−■bu2 = V a2+ V b2−2″vV′i;= V
a”+V b2・・・・・・・・・・・・・・・
・・・・・・・・・・・・(4)(', °V, tVb
K is phase 1. KI Kai fr-meν'; Vb=o)
Similarly, ■52 ””Vb +V'c”・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・(5) V6
”=V c'+V a”・・・・・・・・・
・・・・・・・・・・・・・・・・・・・・・(6) From the above, the detection output vn due to the residual W sound of the signal generator 1 is obtained from the following formula (force ~ (9)) It will be done.
Ｖｎが求められれば、検波器の検波効率には一定である
ので信号発生器１の残留雑音が求められる。Once Vn is determined, the residual noise of the signal generator 1 can be determined since the detection efficiency of the detector is constant.
上記実施例では実効値電圧計を６台用いているが、実際
には１台の実効値電圧計をＩＩｔ４次接続全接続て測定
してよいのけもちろんである。In the above embodiment, six effective value voltmeters are used, but in reality, it is only possible to use one effective value voltmeter with all IIt quaternary connections connected for measurement.
第３図は第２図に示す一実例の使用例を説明するための
ブロック図である。FIG. 3 is a block diagram for explaining an example of use of the example shown in FIG. 2.
これは、水晶発振器１３の残留ジ、ツタを測定する例で
あシ、水晶発振器１３に同−構、Ｉｊ（の位相検波器４
’、５’、 ６’を接続し、これに実効値電圧計７〜１
２を図のように接続する。更に演ａ部１４と表示装置１
５とを接続する。演ｑ部１４は実効値電圧計７〜１２の
出力値を読込んで（７）式に従って演算を行い、その結
果を表示装＃１５に表示する。This is an example of measuring the residual voltage and distortion of the crystal oscillator 13.
', 5', 6' and connect the effective value voltmeter 7 to 1 to this.
Connect 2 as shown in the diagram. Furthermore, a performance section 14 and a display device 1
Connect with 5. The calculation and q section 14 reads the output values of the effective value voltmeters 7 to 12, performs calculations according to equation (7), and displays the results on the display #15.
通常、水晶発振器１３の雑音成分による位相ジッタは非
常に小さくて正確に測定するのが離しいものであるが、
本発明による測定装置を用いる七正確に測定することが
できる。Normally, the phase jitter due to the noise component of the crystal oscillator 13 is very small and difficult to measure accurately.
Seven accurate measurements can be made using the measuring device according to the invention.
以上詳細に説明したように、本発明によれば、測定に使
用する検波器に発生する雑音の影響を受けないで信号源
の残留雑音を正確に測定できる残留雑音測定器が得られ
るのでその効果は大きい。As explained in detail above, according to the present invention, it is possible to obtain a residual noise measuring device that can accurately measure the residual noise of a signal source without being affected by the noise generated in the detector used for measurement. is big.
第１図は従来の残留雑音測定装置の一例のブロック図、
第２図は本発明の一実施例のブロック図、第３図は第２
図に示す一実施例の使用例を説明するだめのブロック図
である。
１・・・・・信号発生器、２・・・・・・検波器、３・
・・・・・実効値電圧計、４．４’、５．５’、６．６
’・・・・・・検波器、７．８，９．ｔｏ、１１．１２
・・・・・・実効値電圧計、１３・・・・・・水晶発振
器、１４・・・・・演算部、１５・・・・・・表示装置
−茅１凹Figure 1 is a block diagram of an example of a conventional residual noise measuring device.
Fig. 2 is a block diagram of one embodiment of the present invention, and Fig. 3 is a block diagram of an embodiment of the present invention.
FIG. 2 is a block diagram illustrating an example of the use of the embodiment shown in the figure. 1... Signal generator, 2... Detector, 3...
... Effective value voltmeter, 4.4', 5.5', 6.6
'...Detector, 7.8,9. to, 11.12
...... Effective value voltmeter, 13... Crystal oscillator, 14... Arithmetic unit, 15... Display device - 1 recess
Claims (1)
波器のそ１＋それの出力電圧を測定する電圧計と、前記
検波器の出力電圧の差の電圧を測定する電圧計とを含む
ことを特徴とする残留雑音測定装置。At least three detectors connected to the signal source under test, a voltmeter for measuring the output voltage of one of the detectors and a voltmeter for measuring the voltage difference between the output voltages of the detectors, and a voltmeter for measuring the difference between the output voltages of the detectors. A residual noise measuring device comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12616582A JPS5917171A (en) | 1982-07-20 | 1982-07-20 | Residual noise measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12616582A JPS5917171A (en) | 1982-07-20 | 1982-07-20 | Residual noise measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5917171A true JPS5917171A (en) | 1984-01-28 |
Family
ID=14928283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12616582A Pending JPS5917171A (en) | 1982-07-20 | 1982-07-20 | Residual noise measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5917171A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2803527A1 (en) | 1977-04-01 | 1978-10-05 | Satake Eng Co Ltd | METHOD AND DEVICE FOR RICE POLISHING |
-
1982
- 1982-07-20 JP JP12616582A patent/JPS5917171A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2803527A1 (en) | 1977-04-01 | 1978-10-05 | Satake Eng Co Ltd | METHOD AND DEVICE FOR RICE POLISHING |
| DE2803527C2 (en) | 1977-04-01 | 1986-10-16 | Satake Engineering Co. Ltd., Tokio/Tokyo | Method of polishing rice |
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