JPH03242089A - Signal detection circuit - Google Patents
Signal detection circuitInfo
- Publication number
- JPH03242089A JPH03242089A JP2040120A JP4012090A JPH03242089A JP H03242089 A JPH03242089 A JP H03242089A JP 2040120 A JP2040120 A JP 2040120A JP 4012090 A JP4012090 A JP 4012090A JP H03242089 A JPH03242089 A JP H03242089A
- Authority
- JP
- Japan
- Prior art keywords
- signal detection
- circuit
- signal
- pulse width
- video
- 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.)
- Granted
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 33
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
Landscapes
- Picture Signal Circuits (AREA)
- Manipulation Of Pulses (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は信号検出回路に関し、特に広範囲のパルス幅の
パルス信号を対象とする信号検出回路に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a signal detection circuit, and particularly to a signal detection circuit that targets pulse signals having a wide range of pulse widths.
従来、この種の信号検出回路は、第２図に示すようにビ
デオ増幅回路２０１．基準電圧回路２０２、電圧比較回
路２０３から構成されていた。この回路のビデオ帯域幅
の中では最も帯域幅が広い最小パルス幅信号の帯域幅に
合わせて設定する必要がある。Conventionally, this type of signal detection circuit includes a video amplifier circuit 201 . It consisted of a reference voltage circuit 202 and a voltage comparison circuit 203. It is necessary to set it according to the bandwidth of the minimum pulse width signal, which is the widest among the video bandwidths of this circuit.
上述した従来の信号検出回路はそのビデオ帯域幅を対象
とする最少パルス幅信号の帯域幅に合わせて設定してい
るため、ビデオ帯域が広く雑音レベルが高いため、対象
パルス幅範囲中の長パルス幅の信号に対しては、信号検
出の感度が低いという欠点がある。The conventional signal detection circuit described above sets its video bandwidth to match the bandwidth of the target minimum pulse width signal, so the video bandwidth is wide and the noise level is high. The disadvantage of this method is that the sensitivity of signal detection is low for wide signals.
本発明の信号検出回路は、ビデオ信号を増幅するビデオ
増幅回路と、基準電圧を発生する基準電圧回路と、前記
ビデオ増幅回路の出力と前記基準電圧とを比較してビデ
オ信号を検出する電圧比較回路とを備えて信号を検出す
る信号検出回路において、ビデオ帯域幅の異る複数の信
号検出回路と、前記複数の信号検出回路の出力を合成し
て出力する論理和回路とを備えて構成される。The signal detection circuit of the present invention includes a video amplification circuit that amplifies a video signal, a reference voltage circuit that generates a reference voltage, and a voltage comparison circuit that detects a video signal by comparing the output of the video amplification circuit and the reference voltage. A signal detection circuit for detecting a signal is configured to include a plurality of signal detection circuits having different video bandwidths and an OR circuit for synthesizing and outputting the outputs of the plurality of signal detection circuits. Ru.
次に本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.
第１図は本発明の一実施例をブロック図のである。FIG. 1 is a block diagram of one embodiment of the present invention.
１０１．１０２は帯域幅の異る信号検出回路で、信号検
出回路１０１は、対象とする最小パルス幅信号の帯域に
合せてビデオ帯域幅を広く設定していうる。信号検出回
路１０２は、対象とする最長パルス幅信号の帯域に合せ
てビデオ帯域幅を狭く設定している。１０ Ｂは論理和
回路で、信号検出回路］、０１．１０２の出力を合成し
て出力する。101 and 102 are signal detection circuits with different bandwidths, and the signal detection circuit 101 can set a wide video bandwidth in accordance with the band of the target minimum pulse width signal. The signal detection circuit 102 has a video bandwidth set narrowly in accordance with the band of the target longest pulse width signal. 10B is an OR circuit which combines the outputs of signal detection circuits 01 and 102 and outputs the result.
信号検出回路１０１は、回路の雑音レベルは高いが、最
小パルス幅信号の検出はそれだけ適したものとなってい
る。雑音レベルＮ ＝ ｋ Ｔ Ｂ ｖ Ｎ ｐで示さ
れ、ここてｋはボルツマン定数、１゛は絶対温度、ＮＦ
は回路の雑音指数である。従って、信号検出回路１０１
はビデオ帯域幅Ｂｖを大としているのでＮは大となるが
、その分最小パルス幅信号の検出が容易となる。Although the signal detection circuit 101 has a high circuit noise level, it is suitable for detecting minimum pulse width signals. The noise level is expressed as N = k T B v N p, where k is Boltzmann's constant, 1' is the absolute temperature, and NF
is the noise figure of the circuit. Therefore, the signal detection circuit 101
Since the video bandwidth Bv is large, N is large, but it becomes easier to detect the minimum pulse width signal.
一方、信号検出口路１０２は、Ｂｖを狭くしであるので
、それだけＮが小となり、長パルス幅信号を感度よく検
出でき、論理和回路１０３は、こうして出力される両信
号検出回路の出力を合成出力する。On the other hand, since the signal detection port 102 narrows Bv, N becomes smaller accordingly, and long pulse width signals can be detected with high sensitivity. Composite output.
以上説明したように本発明は、ビデオ帯域幅の異る複数
の信号検出回路と、前記複数の信号検出回路の出力を合
成して出力する論理和回路とを備えることにより、広範
囲なパルス幅のパルス信号を対象として信号検出する場
合対象パルス幅範囲中の長パルス幅の信号に対して感度
を高くすることが出来るという効果がある。As explained above, the present invention has a plurality of signal detection circuits with different video bandwidths and an OR circuit that synthesizes and outputs the outputs of the plurality of signal detection circuits, thereby achieving a wide range of pulse widths. When detecting pulse signals as a target, there is an effect that sensitivity can be increased for signals with long pulse widths within the target pulse width range.
第１図は本発明の一実施例のブロック図、第２図は従来
の信号検出回路のブロック図である。
１０１・・・信号検出回路、１０２・・・信号検出回路
、１０３・・・論理和回路、２０１・・・ビデオ増幅回
路、２０２・・・基準電圧回路、２０３・・・電圧比較
回路。FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional signal detection circuit. 101... Signal detection circuit, 102... Signal detection circuit, 103... OR circuit, 201... Video amplifier circuit, 202... Reference voltage circuit, 203... Voltage comparison circuit.
Claims (1)
生する基準電圧回路と、前記ビデオ増幅回路の出力と前
記基準電圧とを比較してビデオ信号を検出する電圧比較
回路とを備えて信号を検出する信号検出回路において、
ビデオ帯域幅の異る複数の信号検出回路と、前記複数の
信号検出回路の出力を合成して出力する論理和回路とを
備えて成ることを特徴とする信号検出回路。A video amplifier circuit that amplifies a video signal, a reference voltage circuit that generates a reference voltage, and a voltage comparison circuit that compares the output of the video amplifier circuit and the reference voltage to detect a video signal. In a signal detection circuit that
1. A signal detection circuit comprising: a plurality of signal detection circuits having different video bandwidths; and an OR circuit that combines and outputs the outputs of the plurality of signal detection circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2040120A JP2855751B2 (en) | 1990-02-20 | 1990-02-20 | Signal detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2040120A JP2855751B2 (en) | 1990-02-20 | 1990-02-20 | Signal detection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03242089A true JPH03242089A (en) | 1991-10-29 |
| JP2855751B2 JP2855751B2 (en) | 1999-02-10 |
Family
ID=12571967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2040120A Expired - Lifetime JP2855751B2 (en) | 1990-02-20 | 1990-02-20 | Signal detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2855751B2 (en) |
-
1990
- 1990-02-20 JP JP2040120A patent/JP2855751B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2855751B2 (en) | 1999-02-10 |
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