JPH021969U - - Google Patents
Info
- Publication number
- JPH021969U JPH021969U JP7968588U JP7968588U JPH021969U JP H021969 U JPH021969 U JP H021969U JP 7968588 U JP7968588 U JP 7968588U JP 7968588 U JP7968588 U JP 7968588U JP H021969 U JPH021969 U JP H021969U
- Authority
- JP
- Japan
- Prior art keywords
- diode
- resistor
- capacitor
- frequency
- terminal
- 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
- 239000003990 capacitor Substances 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Details Of Television Scanning (AREA)
Description
第１図は本考案の周波数判別回路の一実施例回
路図、第２図は従来回路及び本考案回路の動作説
明用信号波形図（タイミングチヤート）、第３図
は従来の周波数判別回路図である。
２……ワンシヨツトマルチ、１０……周波数判
別回路、Ｃ１，Ｃ２……コンデンサ、Ｄ１，Ｄ２
……ダイオード、Ｒ１〜Ｒ３……抵抗。
Figure 1 is a circuit diagram of one embodiment of the frequency discrimination circuit of the present invention, Figure 2 is a signal waveform diagram (timing chart) for explaining the operation of the conventional circuit and the circuit of the present invention, and Figure 3 is a diagram of a conventional frequency discrimination circuit. be. 2...One-shot multi, 10...Frequency discrimination circuit, C1 , C2 ...Capacitor, D1 , D2
...Diode, R1 to R3 ...Resistance.
Claims (1)
波数との大小比較を、ワンシヨツトマルチバイブ
レータを用いて行なつて判別する周波数判別回路
において、上記ワンシヨツトマルチバイブレータ
の出力端子に第１の抵抗、第１のダイオード、及
びコンデンサを直列接続して接地すると共に該第
１のダイオードとコンデンサとの接続点に出力端
子を設け、該第１のダイオードとコンデンサとの
接続点に第２のダイオードのアノード側を接続し
、かつ該第２のダイオードのカソード側には第２
の抵抗の一方の端子を接続して、該第２の抵抗の
他方の端子より映像信号の垂直同期信号を供給す
るよう構成したことを特徴とする周波数判別回路
。 In a frequency discrimination circuit that uses a one-shot multivibrator to compare the frequency of a horizontal synchronizing signal of a video signal with a certain fixed frequency to discriminate, a first resistor and a first resistor are connected to the output terminal of the one-shot multivibrator. A first diode and a capacitor are connected in series and grounded, and an output terminal is provided at the connection point between the first diode and the capacitor, and an anode side of the second diode is provided at the connection point between the first diode and the capacitor. and a second diode on the cathode side of the second diode.
1. A frequency discrimination circuit characterized in that one terminal of a second resistor is connected to the second resistor, and a vertical synchronizing signal of a video signal is supplied from the other terminal of the second resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7968588U JPH021969U (en) | 1988-06-16 | 1988-06-16 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7968588U JPH021969U (en) | 1988-06-16 | 1988-06-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH021969U true JPH021969U (en) | 1990-01-09 |
Family
ID=31304542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7968588U Pending JPH021969U (en) | 1988-06-16 | 1988-06-16 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH021969U (en) |
-
1988
- 1988-06-16 JP JP7968588U patent/JPH021969U/ja active Pending
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