JPS63138739U - - Google Patents
Info
- Publication number
- JPS63138739U JPS63138739U JP3115187U JP3115187U JPS63138739U JP S63138739 U JPS63138739 U JP S63138739U JP 3115187 U JP3115187 U JP 3115187U JP 3115187 U JP3115187 U JP 3115187U JP S63138739 U JPS63138739 U JP S63138739U
- Authority
- JP
- Japan
- Prior art keywords
- antenna
- pulse
- synchronization
- supplied
- 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
- 238000000926 separation method Methods 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims 5
- 238000005070 sampling Methods 0.000 claims 4
- 238000001514 detection method Methods 0.000 claims 1
- 238000000034 method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
Description
第１図は本考案のダイバシテイ受信装置を示す
回路図、第２図は第１図の動作説明用の信号波形
図、第３図は従来のダイバシテイ受信装置を示す
回路図、第４図、第５図は第３図の動作説明用の
信号波形図である。
１，２……アンテナ、３……スイツチ回路、８
……同期分離回路、１１……レベル比較回路、１
２……システムコントローラ、１３……カウンタ
回路。
Fig. 1 is a circuit diagram showing the diversity receiving device of the present invention, Fig. 2 is a signal waveform diagram for explaining the operation of Fig. 1, Fig. 3 is a circuit diagram showing a conventional diversity receiving device, Figs. FIG. 5 is a signal waveform diagram for explaining the operation of FIG. 3. 1, 2...Antenna, 3...Switch circuit, 8
... Synchronization separation circuit, 11 ... Level comparison circuit, 1
2...System controller, 13...Counter circuit.
Claims (1)
、最も入力レベルの高いアンテナを自動的に選択
してチユーナに接続するようにしたダイバシテイ
受信装置であつて、 前記チユーナに対するアンテナの接続状態を切
換え可能とし、アンテナ切換パルスの到来毎に別
のアンテナへ切換え接続を行うスイツチ回路と、 前記チユーナからの出力信号を処理して複合映
像信号を得る回路と、 前記複合映像信号および第１、第２のサンプリ
ングパルスが供給され、第１のサンプリングパル
スにより前記切換え前のアンテナでの受信信号レ
ベルを検出し、第２のサンプリングパルスにより
切換え後のアンテナでの受信信号レベルを検出し
、両検出出力を比較して受信信号レベルの大きい
方のアンテナを選択するための比較出力を発生す
るレベル比較回路と、 前記複合映像信号が入力として供給され、出力
として複合同期信号および垂直同期パルスを発生
する同期分離回路と、 前記垂直同期パルスおよび複合同期信号がそれ
ぞれ入力として供給され、前記垂直同期パルスの
後の前記複合同期信号に含まれる水平同期パルス
を所定数カウントして垂直ブランキング期間内に
おいてトリガパルスを出力するカウンタ回路と、 前記トリガパルスが供給され、このトリガパル
スを基準にして垂直ブランキング期間内の所定の
水平同期信号とこれに続く次の水平同期信号間に
おいて前記アンテナ切換パルスおよび第１、第２
のサンプリングパルスを発生するシステムコント
ローラとを具備して成るダイバシテイ受信装置。[Claims for Utility Model Registration] A diversity receiving device that receives television broadcast signals through a plurality of antennas and automatically selects the antenna with the highest input level and connects it to a tuner, the antenna for said tuner a switch circuit that can switch the connection state of the antenna and switches the connection to another antenna each time an antenna switching pulse arrives; a circuit that processes the output signal from the tuner to obtain a composite video signal; First and second sampling pulses are supplied, the first sampling pulse detects the received signal level at the antenna before switching, and the second sampling pulse detects the received signal level at the antenna after switching. , a level comparison circuit that generates a comparison output for comparing both detection outputs and selecting the antenna with a higher received signal level; and the composite video signal is supplied as an input, and a composite synchronization signal and a vertical synchronization pulse are supplied as outputs. a synchronization separation circuit that generates a vertical synchronization pulse and a composite synchronization signal, each of which is supplied as an input, and counts a predetermined number of horizontal synchronization pulses included in the composite synchronization signal after the vertical synchronization pulse to generate a vertical blanking period. a counter circuit that outputs a trigger pulse within a vertical blanking period; Pulse and first, second
and a system controller that generates sampling pulses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3115187U JPS63138739U (en) | 1987-03-05 | 1987-03-05 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3115187U JPS63138739U (en) | 1987-03-05 | 1987-03-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63138739U true JPS63138739U (en) | 1988-09-13 |
Family
ID=30836625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3115187U Pending JPS63138739U (en) | 1987-03-05 | 1987-03-05 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63138739U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02141180A (en) * | 1988-11-22 | 1990-05-30 | Seiko Epson Corp | Diversity device for television receiver |
-
1987
- 1987-03-05 JP JP3115187U patent/JPS63138739U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02141180A (en) * | 1988-11-22 | 1990-05-30 | Seiko Epson Corp | Diversity device for television receiver |
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