JP2855751B2 - Signal detection circuit - Google Patents
Signal detection circuitInfo
- Publication number
- JP2855751B2 JP2855751B2 JP2040120A JP4012090A JP2855751B2 JP 2855751 B2 JP2855751 B2 JP 2855751B2 JP 2040120 A JP2040120 A JP 2040120A JP 4012090 A JP4012090 A JP 4012090A JP 2855751 B2 JP2855751 B2 JP 2855751B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal detection
- signal
- video
- detection circuit
- 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
- 238000001514 detection method Methods 0.000 title claims description 28
- 230000003321 amplification Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
Landscapes
- Picture Signal Circuits (AREA)
- Manipulation Of Pulses (AREA)
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。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal detection circuit, and more particularly to a signal detection circuit for a pulse signal having a wide pulse width.
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 kind of signal detection circuit includes a video amplifier circuit 201, a reference voltage circuit 202, a voltage comparison circuit 203 as shown in FIG.
Was composed of Of the video bandwidth of this circuit, it is necessary to set it in accordance with the bandwidth of the minimum pulse width signal having the widest bandwidth.
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 the target minimum pulse width signal bandwidth, so that the video band is wide and the noise level is high, so long pulses in the target pulse width range There is a disadvantage that the sensitivity of signal detection is low for signals having a width.
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 according to the present invention includes a video amplification circuit for amplifying a video signal, a reference voltage circuit for generating a reference voltage, and a voltage comparison circuit for comparing an output of the video amplification circuit with the reference voltage to detect a video signal. A signal detection circuit for detecting a signal comprising a circuit, comprising: a plurality of signal detection circuits having different video bandwidths; and an OR circuit for combining and outputting outputs of the plurality of signal detection circuits. You.
次に本発明について図面を参照して説明する。第１図
は本発明の一実施例をブロック図のである。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。103は論理和回路で、信号検出回路101,1
02の出力を合成して出力する。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＝kTBVNF
で示され、ここでｋはボルツマン定数、Ｔ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。Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of the present invention. Reference numerals 101 and 102 denote signal detection circuits having different bandwidths, and the signal detection circuit 101 may set a wide video bandwidth in accordance with the band of the target minimum pulse width signal. The signal detection circuit 102 sets the video bandwidth narrow in accordance with the band of the target longest pulse width signal. 103 is an OR circuit, and the signal detection circuits 101, 1
The output of 02 is combined and output. Although the signal detection circuit 101 has a high noise level in the circuit, detection of the minimum pulse width signal is suitable for that. Noise level N = kTB V N F
Where k is Boltzmann's constant, T is absolute temperature,
N F is the noise figure of the circuit. Therefore, the signal detection circuit 101
Has a large video bandwidth B V , so N is large,
This makes it easier to detect the minimum pulse width signal.
一方、信号検出回路102は、BVを狭くしてあるので、
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 circuit 102 narrows B V ,
As a result, N becomes small, and the long pulse width signal can be detected with high sensitivity, and the OR circuit 103 combines and outputs the outputs of the two signal detection circuits thus 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 described above, the present invention includes 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, thereby providing a wide range of pulse widths. When a signal is detected for a pulse signal, there is an effect that the sensitivity can be increased for a signal having a long pulse width in 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 one 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)
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成ることを特徴とする信号検出回
路。A video amplifier circuit for amplifying a video signal;
A reference voltage circuit that generates a reference voltage; and a signal detection circuit that detects a signal by including a voltage comparison circuit that detects a video signal by comparing the output of the video amplification circuit with the reference voltage. A signal detection circuit comprising: a plurality of different signal detection circuits; and an OR circuit for combining and outputting 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 JPH03242089A (en) | 1991-10-29 |
| JP2855751B2 true 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 |
|---|---|
| JPH03242089A (en) | 1991-10-29 |
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