JPH0314841Y2 - - Google Patents
Info
- Publication number
- JPH0314841Y2 JPH0314841Y2 JP6588186U JP6588186U JPH0314841Y2 JP H0314841 Y2 JPH0314841 Y2 JP H0314841Y2 JP 6588186 U JP6588186 U JP 6588186U JP 6588186 U JP6588186 U JP 6588186U JP H0314841 Y2 JPH0314841 Y2 JP H0314841Y2
- Authority
- JP
- Japan
- Prior art keywords
- electric field
- level
- noise level
- field strength
- signal
- 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
Links
- 230000005684 electric field Effects 0.000 claims description 46
- 238000001514 detection method Methods 0.000 claims description 26
- 230000003321 amplification Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Description
【考案の詳細な説明】
［産業上の利用分野］
本考案は自動車電話、パーソナル無線、その他
FM通信で使用される電界強度検出装置に関す
る。[Detailed description of the invention] [Industrial application field] The invention is applicable to car telephones, personal radios, etc.
Regarding electric field strength detection devices used in FM communications.
［考案の概要］
受信信号の雑音レベルを判定することにより、
ダイナミツクレンジを広く取れる目的外強入力信
号等による電界レベルの誤表示を防止した電界強
度検出装置である。[Summary of the invention] By determining the noise level of the received signal,
This is an electric field strength detection device that prevents erroneous display of electric field level due to unintended strong input signals, etc., which can have a wide dynamic range.
［従来の技術］
自動車電話、パーソナル無線、その他FM通信
においては、従来、目的周波数の電波を受け、増
幅し、検波し、その検波出力値を電界によつて設
定された閾値と比較し、電界の強弱を判定してい
た。[Prior Art] Conventionally, in car phones, personal radios, and other FM communications, radio waves of a target frequency are received, amplified, detected, and the detected output value is compared with a threshold value set by the electric field. was determining the strength and weakness of
［考案が解決しようとする課題］
しかしこの方法では第２図に示す周波数と電界
レベルの関係からわかるように、Ｂ〜Ｃの周波数
範囲で、電界レベル閾値Ａを超えた信号を発生す
る。第３図は空中線レベルと電界レベルの関係を
示し、実線は目的周波数レベル、破線は隣接周波
数のレベルを表わす。[Problems to be Solved by the Invention] However, in this method, as can be seen from the relationship between frequency and electric field level shown in FIG. 2, a signal exceeding the electric field level threshold A is generated in the frequency range B to C. FIG. 3 shows the relationship between the antenna level and the electric field level, where the solid line represents the target frequency level and the broken line represents the level of the adjacent frequency.
従つて、第３図実線で示す所望周波数の信号を
受信しようとした時、第３図破線に示すように隣
接周波数での強電界の電波が発生すると、電界レ
ベル閾値Ａを超えた隣接周波数の信号を受信して
しまい、目的の周波数の電波を受信したかのよう
に電界を検出してしまうという欠点があつた。 Therefore, when attempting to receive a signal at the desired frequency shown by the solid line in Figure 3, if a strong electric field radio wave at an adjacent frequency is generated as shown by the broken line in Figure 3, the signal at the adjacent frequency exceeding the electric field level threshold A is generated. The problem was that the signal would be received and the electric field would be detected as if it were receiving radio waves of the desired frequency.
本考案の目的は、このような不具合を生じない
ようにするため、目的の周波数以外での電界レベ
ルの検出を行なわないようにする電界強度検出装
置を提供することである。 An object of the present invention is to provide an electric field strength detection device that does not detect electric field levels at frequencies other than the target frequency, in order to prevent such problems from occurring.
［課題を解決するための手段］
上記目的を達成するために、本考案による電界
強度検出装置は、上記受信した信号の電界強度を
検出する電界強度検出回路と、上記受信した信号
の雑音のレベルを検出する雑音レベル検出回路
と、上記電界強度検出回路出力が所定の電界レベ
ル閾値を越え、かつ上記雑音レベル検出回路出力
が所定の雑音レベル閾値以下のとき、目的周波数
の信号を受信したことを示す信号を出力する電界
判定回路とを含むことを要旨とする。[Means for Solving the Problems] In order to achieve the above object, a field strength detection device according to the present invention includes a field strength detection circuit that detects the field strength of the received signal, and a noise level of the received signal. and a noise level detection circuit that detects a signal of a target frequency when the output of the field strength detection circuit exceeds a predetermined electric field level threshold and the output of the noise level detection circuit is below a predetermined noise level threshold. The gist is to include an electric field determination circuit that outputs a signal indicating.
［作用］
目的周波数での雑音レベルと、隣接周波数での
雑音レベル表わしたのが、第４図であり、横軸は
空中線入力レベル、縦軸は雑音増幅出力レベルを
表わす。なお、ここでＥは、雑音レベルの閾値で
ある。図でわかるように、空中線レベルが増加す
るにつれて目的周波数での雑音レベルは下がるの
に対し、隣接周波数での雑音レベルは、ある値か
ら下にならないことがわかる。[Operation] FIG. 4 shows the noise level at the target frequency and the noise level at adjacent frequencies, where the horizontal axis represents the antenna input level and the vertical axis represents the noise amplification output level. Note that E here is a threshold value of the noise level. As can be seen from the figure, as the antenna level increases, the noise level at the target frequency decreases, while the noise level at adjacent frequencies does not fall below a certain value.
これは目的周波数以外の物はオーバーオールで
の位相歪等歪成分が増え、雑音を発生させている
ため、この歪雑音により雑音レベルが低下しない
ためである。 This is because for frequencies other than the target frequency, overall distortion components such as phase distortion increase and generate noise, so the noise level does not decrease due to this distortion noise.
本考案による電界強度検出装置は、この点に着
目し、所望周波数での電界レベルと雑音レベルを
検出し、これに基づいて本来受信すべき電波とそ
れ以外の電波を区別する。 The field strength detection device according to the present invention focuses on this point, detects the electric field level and noise level at a desired frequency, and distinguishes between radio waves that should be received and other radio waves based on this.
［実施例］
以下に、図面を参照しながら、実施例を用いて
本考案を一層詳細に説明するが、それらは例示に
過ぎず、本考案の枠を越えることなしにいろいろ
な変形や改良があり得ることは勿論である。[Examples] The present invention will be explained in more detail below using examples with reference to the drawings, but these are merely illustrative and various modifications and improvements can be made without going beyond the scope of the present invention. Of course it is possible.
第１図は本考案による電界強度検出装置の構成
を示すブロツク図で、図中、１はアンテナ、２は
高周波増幅器、３は周波数変換器、４は局部発振
器、５は中間増幅器、８は電界判定（目的か目的
外か）回路、９は電界レベル表示器に至る出力、
１０は雑音レベル検出回路、１１は雑音レベル基
準比較回路、１２は電界強度検出回路、１３は電
界強度基準比較回路を表わす。 FIG. 1 is a block diagram showing the configuration of an electric field strength detection device according to the present invention. In the figure, 1 is an antenna, 2 is a high frequency amplifier, 3 is a frequency converter, 4 is a local oscillator, 5 is an intermediate amplifier, and 8 is an electric field. Judgment (target or untargeted) circuit, 9 is the output leading to the electric field level indicator,
Reference numeral 10 represents a noise level detection circuit, 11 represents a noise level reference comparison circuit, 12 represents an electric field strength detection circuit, and 13 represents an electric field strength reference comparison circuit.
アンテナ１に到来した電波は、高周波増幅器２
を通つて増幅され、局部発振器４の信号を使用し
て、周波数変換器３を通して所定中間周波数の信
号に変換され、中間増幅器５に送られる。この中
間増幅器５から雑音レベル検出回路１０と電界強
度検出回路１２へと中間周波数信号が取り出さ
れ、雑音レベル検出回路１０では、この中間増幅
器５の信号から雑音レベルを検出する。この検出
された出力が、雑音レベル基準比較回路１１にて
所定の雑音レベル閾値以上か以下かの比較出力を
発生する。また、電界強度検出回路１２では、前
記中間増幅器５の信号から電界レベルを検出す
る。この検出された出力が、電界強度基準比較回
路１３にて所定の電界レベル閾値以上か以下かの
比較出力を発生する。そして、雑音レベル基準比
較回路１１からの出力と電界強度検出回路１２か
らの出力に基づいて、電界判定回路８では所定電
界レベル閾値以上であるとの出力と所定雑音レベ
ル閾値以下であるとの出力があるときに、電界レ
ベル表示器に至る出力９から、目的周波数の信号
を受信したことを示す信号を出力し、それ以外の
時は出力しない。 The radio waves arriving at antenna 1 are sent to high frequency amplifier 2
Using the signal from the local oscillator 4, the signal is converted to a signal at a predetermined intermediate frequency through the frequency converter 3, and sent to the intermediate amplifier 5. An intermediate frequency signal is taken out from this intermediate amplifier 5 to a noise level detection circuit 10 and a field strength detection circuit 12, and the noise level detection circuit 10 detects the noise level from the signal of this intermediate amplifier 5. A noise level reference comparison circuit 11 generates a comparison output indicating whether the detected output is above or below a predetermined noise level threshold. Further, the electric field strength detection circuit 12 detects the electric field level from the signal from the intermediate amplifier 5. An electric field strength reference comparison circuit 13 generates a comparison output indicating whether the detected output is above or below a predetermined electric field level threshold. Then, based on the output from the noise level reference comparison circuit 11 and the output from the electric field strength detection circuit 12, the electric field determination circuit 8 outputs an output indicating that the electric field level is above a predetermined electric field level threshold and an output indicating that the electric field level is below a predetermined noise level threshold. At certain times, a signal indicating that a signal of the target frequency has been received is outputted from the output 9 leading to the electric field level indicator, and at other times it is not outputted.
以上のような本考案による電界強度検出装置は
パーソナル無線、自動車電話、その他電界による
各種制御を行なう通信回線に利用して目的外信号
を除去すことができる。 The field strength detection device according to the present invention as described above can be used in personal radios, car telephones, and other communication lines that perform various controls using electric fields to remove unintended signals.
［考案の効果］
以上説明した通り、本考案によれば、電界レベ
ルと雑音レベルを検出し、夫々の閾値と比較する
ことによつて目的周波数以外の強入力信号があつ
ても誤判定表示を防止することができる。[Effects of the invention] As explained above, according to the invention, by detecting the electric field level and the noise level and comparing them with their respective threshold values, it is possible to prevent false judgment display even if there is a strong input signal other than the target frequency. It can be prevented.
第１図は本考案による電界強度検出装置の構成
を示すブロツク図、第２図は周波数と電界レベル
の関係を示すグラフ、第３図は空中線入力レベル
と電界レベルの関係を示すグラフ、第４図は空中
線入力レベルと雑音増幅出力レベルの関係を示す
グラフである。
１……アンテナ、２……高周波増幅器、３……
周波数変換器、４……局部発振器、５……中間増
幅器、８……電界判定回路、９……電界レベル表
示器に至る出力、１０……雑音レベル検出回路、
１１……雑音レベル基準比較回路、１２……電界
強度検出回路、１３……電界強度基準比較回路。
Figure 1 is a block diagram showing the configuration of the electric field strength detection device according to the present invention, Figure 2 is a graph showing the relationship between frequency and electric field level, Figure 3 is a graph showing the relationship between antenna input level and electric field level, and Figure 4 is a graph showing the relationship between antenna input level and electric field level. The figure is a graph showing the relationship between the antenna input level and the noise amplification output level. 1...Antenna, 2...High frequency amplifier, 3...
Frequency converter, 4... Local oscillator, 5... Intermediate amplifier, 8... Electric field determination circuit, 9... Output leading to electric field level indicator, 10... Noise level detection circuit,
11... Noise level reference comparison circuit, 12... Electric field strength detection circuit, 13... Electric field strength reference comparison circuit.
Claims (1)
おいて、 (a) 上記受信した信号の電界強度を検出する電界
強度検出回路、 (b) 上記受信した信号の雑音のレベルを検出する
雑音レベル検出回路、および (c) 上記電界強度検出回路出力が所定の電界レベ
ル閾値を越え、かつ上記雑音レベル検出回路出
力が所定の雑音レベル閾値以下のとき、目的周
波数の信号を受信したことを示す信号を出力す
る電界判定回路 を含むことを特徴とする電界強度検出装置。[Claims for Utility Model Registration] A device for displaying the electric field level of a received signal, comprising: (a) an electric field strength detection circuit for detecting the electric field strength of the received signal; (b) a noise level display for the received signal; a noise level detection circuit to detect, and (c) when the output of the field strength detection circuit exceeds a predetermined electric field level threshold and the output of the noise level detection circuit is below a predetermined noise level threshold, a signal of a target frequency is received. An electric field strength detection device comprising: an electric field determination circuit that outputs a signal indicating that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6588186U JPH0314841Y2 (en) | 1986-04-30 | 1986-04-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6588186U JPH0314841Y2 (en) | 1986-04-30 | 1986-04-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62178633U JPS62178633U (en) | 1987-11-13 |
| JPH0314841Y2 true JPH0314841Y2 (en) | 1991-04-02 |
Family
ID=30903365
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6588186U Expired JPH0314841Y2 (en) | 1986-04-30 | 1986-04-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0314841Y2 (en) |
-
1986
- 1986-04-30 JP JP6588186U patent/JPH0314841Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62178633U (en) | 1987-11-13 |
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