JPH042147U - - Google Patents
Info
- Publication number
- JPH042147U JPH042147U JP4159190U JP4159190U JPH042147U JP H042147 U JPH042147 U JP H042147U JP 4159190 U JP4159190 U JP 4159190U JP 4159190 U JP4159190 U JP 4159190U JP H042147 U JPH042147 U JP H042147U
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- signal
- data
- receives
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Description
第１図乃至第３図は本考案の実施例を示すもの
で、第１図は要部ブロツク図、第２図は受信信号
の構成を示す図、第３図はビツト同期パターンの
検波波形図、第４図は従来例を示す要部ブロツク
図である。
１１……周波数検波回路、１２１……帯域通過
フイルタ、１２２……低域通過フイルタ、１２３
……切替手段、１３……キヤリアセンス回路、１
４……判定回路、１５……マイクロプロセツサ（
制御手段）。
1 to 3 show an embodiment of the present invention. FIG. 1 is a block diagram of the main part, FIG. 2 is a diagram showing the structure of a received signal, and FIG. 3 is a detection waveform diagram of a bit synchronization pattern. , FIG. 4 is a main part block diagram showing a conventional example. 11...Frequency detection circuit, 12 1 ...Band pass filter, 12 2 ...Low pass filter, 12 3
...Switching means, 13...Carrier sense circuit, 1
4... Judgment circuit, 15... Microprocessor (
control means).
Claims (1)
期確立を行い、同期確立後にデータ受信を行うデ
ータ通信装置において、受信した中間周波数信号
を検波する検波回路と、受信した中間周波数信号
のレベルを検知して信号の到来を判定するキヤリ
アセンス回路と、周波数通過特性がビツト同期パ
ターンの周波数及びデータの周波数に対応して切
替えられ前記検波回路からの検波出力信号を取込
むベースバンドフイルタと、このフイルタを通過
した検波出力信号を判定し２値化する判定回路と
、前記キヤリアセンス回路からの信号到来判定出
力に応動し前記ベースバンドフイルタの周波数通
過特性を最初はビツト同期パターンの周波数に対
応して切替え、同期確立を行つた後はデータの周
波数に対応して切替える制御手段を設けたことを
特徴とするデータ通信装置の復調装置。 In a data communication device that receives a bit synchronization pattern to establish synchronization at the start of communication, and then receives data after synchronization is established, a detection circuit that detects the received intermediate frequency signal and a detection circuit that detects the level of the received intermediate frequency signal are used. a carrier sense circuit that determines the arrival of a signal; a baseband filter whose frequency passing characteristics are switched in accordance with the frequency of the bit synchronization pattern and the frequency of data; and a baseband filter that receives the detection output signal from the detection circuit; a determination circuit that determines and binarizes the detected output signal, and responsive to the signal arrival determination output from the carrier sense circuit, initially switches the frequency passing characteristic of the baseband filter in response to the frequency of the bit synchronization pattern; 1. A demodulation device for a data communication device, characterized in that the demodulation device for a data communication device is provided with a control means for switching in accordance with the frequency of data after synchronization is established.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4159190U JPH042147U (en) | 1990-04-20 | 1990-04-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4159190U JPH042147U (en) | 1990-04-20 | 1990-04-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH042147U true JPH042147U (en) | 1992-01-09 |
Family
ID=31552388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4159190U Pending JPH042147U (en) | 1990-04-20 | 1990-04-20 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH042147U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102019213868B4 (en) * | 2018-09-21 | 2021-04-22 | Honda Motor Co., Ltd. | LAMP BODY STRUCTURE FOR A SADDLE-TYPE VEHICLE |
-
1990
- 1990-04-20 JP JP4159190U patent/JPH042147U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102019213868B4 (en) * | 2018-09-21 | 2021-04-22 | Honda Motor Co., Ltd. | LAMP BODY STRUCTURE FOR A SADDLE-TYPE VEHICLE |
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