JPH0478841U - - Google Patents
Info
- Publication number
- JPH0478841U JPH0478841U JP12223390U JP12223390U JPH0478841U JP H0478841 U JPH0478841 U JP H0478841U JP 12223390 U JP12223390 U JP 12223390U JP 12223390 U JP12223390 U JP 12223390U JP H0478841 U JPH0478841 U JP H0478841U
- Authority
- JP
- Japan
- Prior art keywords
- clock
- service data
- 276khz
- frequency
- 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.)
- Granted
Links
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Synchronisation In Digital Transmission Systems (AREA)
Description
第１図は本考案の一実施例の回路図、第２図は
第１図の作成回路によつて作成された２７６ｋHz
クロツクを示す図、第３図は従来の２７６ｋHzク
ロツク作成回路のブロツク図である。
１１，１２……カウンタ、１３……ＮＯＲゲー
ト、１４……インバータ、１５，１６……フリツ
プフロツプ。
Figure 1 is a circuit diagram of an embodiment of the present invention, and Figure 2 is a 276kHz circuit created using the circuit shown in Figure 1.
Figure 3, which shows the clock, is a block diagram of a conventional 276kHz clock generating circuit. 11, 12... Counter, 13... NOR gate, 14... Inverter, 15, 16... Flip-flop.
Claims (1)
バータ部で、サービスデータ・インタフエイスユ
ニツトへ送出するサービスデータ読み出し用２７
６ｋHzクロツクを作成する作成回路において、 主信号のビツトレートの周波数である１６８．
４４３１ＭHzで発振する電圧制御発振器のクロツ
クを６分周した２８．０７３ＭHzを基本としたデ
ジタル的な5/508分周を行う手段を有することを
特徴とするサービスデータの２７６ｋHzクロツク
作成回路。 (2) 請求項１記載のサービスデータの２７６ｋH
zクロツク作成回路において、 前記手段は、前記２８．０７３ＭHzのクロツク
をカウンタによりデジタル的にカウントしクロツ
クを作り出すカウンタ部と、このカウンタ部の出
力するクロツクを２分周し、２７６．３１７ｋHz
にする分周部とを備えることを特徴とするサービ
スデータの２７６ｋHzクロツク作成回路。[Claims for Utility Model Registration] (1) 27 for reading service data sent to the service data interface unit in the transmitting/receiving side code converter section of the 140M OLT.
In a circuit that creates a 6kHz clock, the frequency of the main signal bit rate is 168.
A circuit for creating a 276kHz clock for service data, characterized in that it has means for digitally dividing the frequency of a voltage-controlled oscillator oscillating at 4431MHz by 6 to 28.073MHz, and digitally dividing the frequency by 5/508. (2) 276kHz of service data as stated in claim 1
In the z clock generation circuit, the means includes a counter unit that digitally counts the 28.073 MHz clock using a counter to generate a clock, and a clock output from this counter unit, which is divided by two to produce a 276.317 kHz clock.
A 276kHz clock generation circuit for service data, characterized in that it comprises a frequency dividing section that divides the clock into 276kHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12223390U JP2545389Y2 (en) | 1990-11-21 | 1990-11-21 | 276kHz clock generation circuit for service data |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12223390U JP2545389Y2 (en) | 1990-11-21 | 1990-11-21 | 276kHz clock generation circuit for service data |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0478841U true JPH0478841U (en) | 1992-07-09 |
| JP2545389Y2 JP2545389Y2 (en) | 1997-08-25 |
Family
ID=31870025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12223390U Expired - Lifetime JP2545389Y2 (en) | 1990-11-21 | 1990-11-21 | 276kHz clock generation circuit for service data |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2545389Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003087229A (en) * | 2001-09-11 | 2003-03-20 | Sony Corp | Clock generation apparatus and method |
-
1990
- 1990-11-21 JP JP12223390U patent/JP2545389Y2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003087229A (en) * | 2001-09-11 | 2003-03-20 | Sony Corp | Clock generation apparatus and method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2545389Y2 (en) | 1997-08-25 |
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