JP2745890B2 - Squelch control method - Google Patents
Squelch control methodInfo
- Publication number
- JP2745890B2 JP2745890B2 JP22554591A JP22554591A JP2745890B2 JP 2745890 B2 JP2745890 B2 JP 2745890B2 JP 22554591 A JP22554591 A JP 22554591A JP 22554591 A JP22554591 A JP 22554591A JP 2745890 B2 JP2745890 B2 JP 2745890B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- squelch
- control
- generator
- control unit
- 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 - Fee Related
Links
Landscapes
- Noise Elimination (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明はスケルチ制御方式に関
し、特に非再生中継方式を採用したディジタル無線通信
回線のスケルチ制御方式に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a squelch control system, and more particularly to a squelch control system for a digital wireless communication line employing a non-regenerative relay system.
【０００２】[0002]
【従来の技術】一般に無線通信回線が図２に示すよう
に、送信部１４，監視制御部１１Ａを有する送信端局１
１、受信部１５，送信部１６，監視制御部１２Ａを有す
る中継局１２、受信部１７，監視制御部１３Ａを有する
受信端局１３から構成されている場合に、従来のスケル
チ制御方式は図２に示す様に、入力信号２１に監視制御
部（以下、ＡＳという）１１ＡからＩＤ信号を含む制御
線信号２２を主信号に多重化器３にて多重化して送信す
る。中継局１２では、制御信号復調器（以下、ＳＣＤＥ
Ｍという）４により、主信号から制御線信号を復調し、
中継局１２のＡＳ１２Ａに送る。このとき、制御線信号
に多重化されているＩＤ信号は、ＳＣＤＥＭ４の出力を
ＩＤ信号検出器（以下、ＤＥＴという）６に入力するこ
とによって検出し、ＩＤ信号が所定パターンと相違して
いると、入力信号セレクタ（以下、ＳＥＬという）５に
より主信号を終端し、スケルチ動作を行なう。したがっ
て後続する受信端局１３に不要波を送信部１６から送信
しない様になっていた。ＩＤ信号が正常の場合には、主
信号とＡＳ１２Ａの制御線信号２３が多重化器７にて多
重化され、受信端局１３に伝送されて、受信部１７のＳ
ＣＤＥＭ８にて制御線信号およびＩＤ信号が復調されて
ＡＳ１３に送られていた。2. Description of the Related Art Generally, as shown in FIG. 2, a transmission terminal station 1 having a transmission section 14 and a monitoring control section 11A has a radio communication line.
1, a receiving unit 15, a transmitting unit 16, a relay station 12 having a monitoring control unit 12A, and a receiving terminal station 13 having a receiving unit 17 and a monitoring control unit 13A. As shown in (1), a control line signal 22 including an ID signal is superimposed on an input signal 21 from an supervisory control unit (hereinafter, referred to as AS) 11A by a multiplexer 3 and transmitted to a main signal. In the relay station 12, a control signal demodulator (hereinafter, SCDE)
M) 4 demodulates the control line signal from the main signal,
It is sent to the AS 12A of the relay station 12. At this time, the ID signal multiplexed with the control line signal is detected by inputting the output of the SCDEM 4 to an ID signal detector (hereinafter, referred to as DET) 6, and if the ID signal is different from the predetermined pattern. The main signal is terminated by an input signal selector (hereinafter, referred to as SEL) 5 to perform a squelch operation. Therefore, the unnecessary wave is not transmitted from the transmitting unit 16 to the subsequent receiving terminal station 13. When the ID signal is normal, the main signal and the control line signal 23 of the AS 12A are multiplexed by the multiplexer 7 and transmitted to the reception terminal station 13, and the S
The control line signal and the ID signal were demodulated by the CDEM 8 and sent to the AS 13.
【０００３】[0003]
【発明が解決しようとする課題】この従来のスケルチ制
御方式では、ＡＳの制御信号内のＩＤ信号を用いて主信
号のスケルチ動作検出を行なっているので、送信端局に
おいて、ＡＳの保守故障等により、制御線信号が断にな
ると同時にＩＤ信号も失われるために、後続する他の区
間は全てスケルチ動作してしまい入力信号が通常にもか
かわらず主信号が断となってしまう欠点がある。In this conventional squelch control method, the squelch operation of the main signal is detected using the ID signal in the control signal of the AS. As a result, since the control line signal is cut off and the ID signal is also lost at the same time, there is a disadvantage that the squelch operation is performed in all other subsequent sections, and the main signal is cut off even though the input signal is normal.
【０００４】[0004]
【課題を解決するための手段】本発明のスケルチ制御方
式は非再生中継方式を用いた送信端局と少なくとも一つ
の中継局と受信端局とで構成される無線伝送回線におけ
る前記送信端局の監視制御部に備えられた制御線識別信
号発生器のＩＤ信号をスケルチ動作のための制御信号と
併用して前記中継局および前記受信端局にＩＤ信号検出
手段を備えたスケルチ制御方式において、前記送信端局
に前記監視制御部の障害時に動作する制御線識別信号送
出手段を備えている。A squelch control system according to the present invention uses a non-regenerative relay system for transmitting and receiving at least one relay station and a receiving terminal. In the squelch control method including ID signal detection means in the relay station and the receiving terminal using an ID signal of a control line identification signal generator provided in a monitoring control unit together with a control signal for a squelch operation, The transmitting terminal station is provided with a control line identification signal transmitting means that operates when the monitoring control unit fails.
【０００５】[0005]
【実施例】次に本発明について図面を参照して説明す
る。図１は本発明の一実施例のシステム構成図である。
図１において図２の従来例と同一の符号は同一の構成と
機能を有する。すなわち、本実施例では送信端局１１に
ＩＤ信号発生器１とＩＤ信号検出器２を備えている。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a system configuration diagram of an embodiment of the present invention.
1, the same reference numerals as those in the conventional example of FIG. 2 have the same configuration and function. That is, in this embodiment, the transmitting terminal station 11 includes the ID signal generator 1 and the ID signal detector 2.
【０００６】次に本実施例の動作を説明する。送信端局
１１において入力信号２１はＡＳ１１Ａからの制御信号
を多重化器３Ａにて多重化して送信される。中継局１２
では、ＳＣＤＥＭ４にて復調し、多重化分離されて、Ａ
Ｓ１２ＡとＤＥＴ６に出力される。ＤＥＴ６では、制御
信号中のＩＤ識別信号を検出して、ＩＤ識別ができない
ときには、受信信号が干渉波であるとみなし、ＳＥＬ５
が動作して主信号を終端し、送信部１６から次区間の受
信端局１３に干渉波を送信しない様に主信号をスケルチ
動作する。本実施例では送信端局１１のＡＳ１１Ａが故
障等で、送信すべきＩＤ信号を送出しなくなると、送信
部１４のＩＤ信号検出器（ＤＥＴ）２がＩＤ信号の断を
検出するとともに、ＩＤ信号発生器１を制御して動作さ
せＩＤ信号を多重化器３Ａに送出し主信号と多重化す
る。これにより、中継局１２に対すす無線回線が正常で
あれば、新たに送出されたＩＤ信号をＳＣＤＥＭ４、Ｄ
ＥＴ６が検出し、ＳＥＬ５のスケルチ動作を解除させる
ことができる。Next, the operation of this embodiment will be described. In the transmitting terminal station 11, the input signal 21 is transmitted by multiplexing the control signal from the AS 11A in the multiplexer 3A. Relay station 12
Then, the signal is demodulated by SCDEM4, demultiplexed and separated, and A
It is output to S12A and DET6. In DET6, an ID identification signal in the control signal is detected, and if ID identification is not possible, the received signal is regarded as an interference wave, and SEL5
Operates to terminate the main signal, and squelch the main signal so as not to transmit an interference wave from the transmitting section 16 to the receiving terminal station 13 in the next section. In this embodiment, when the AS 11A of the transmitting terminal station 11 fails to transmit the ID signal to be transmitted due to a failure or the like, the ID signal detector (DET) 2 of the transmitting unit 14 detects the disconnection of the ID signal and outputs the ID signal. The generator 1 is controlled and operated, and the ID signal is sent to the multiplexer 3A and multiplexed with the main signal. As a result, if the radio line to the relay station 12 is normal, the newly transmitted ID signal is sent to the SCDEM4,
The squelch operation of SEL5 can be canceled by ET6 detecting.
【０００７】[0007]
【発明の効果】以上説明したように本発明は、送信端局
の送信部に別のＩＤ信号発生器を備えているので、監視
制御部の故障や、保守時にも安定したスケルチ動作を行
なうことができるという効果がある。As described above, according to the present invention, since a separate ID signal generator is provided in the transmitting section of the transmitting terminal, a stable squelch operation can be performed even when the monitoring control section fails or when maintenance is performed. There is an effect that can be.
【図１】本発明の一実施例の構成図である。FIG. 1 is a configuration diagram of an embodiment of the present invention.
【図２】従来のスケルチ制御方式の構成図である。FIG. 2 is a configuration diagram of a conventional squelch control method.
１ ＩＤ信号発生器 ２ ＩＤ信号検出器 ３，３Ａ，７ 多重化器 ４ 制御信号復調器 ５ セレクタ ６ ＩＤ信号検出器 ８ 制御信号復調器 １１ 送信端局 １２ 中継局 １３ 受信端局 １４，１６ 送信部 １５，１７ 受信部 １１Ａ，１２Ａ，１３Ａ 監視制御部 DESCRIPTION OF SYMBOLS 1 ID signal generator 2 ID signal detector 3, 3A, 7 Multiplexer 4 Control signal demodulator 5 Selector 6 ID signal detector 8 Control signal demodulator 11 Transmission terminal station 12 Relay station 13 Receiving terminal station 14, 16 Transmission Units 15, 17 Receiving units 11A, 12A, 13A Monitoring control unit
Claims (2)
くとも一つの中継局と受信端局とで構成される無線伝送
回線における前記送信端局の監視制御部に備えられた制
御線識別信号発生器のＩＤ信号をスケルチ動作のための
制御信号と併用して前記中継局および前記受信端局にＩ
Ｄ信号検出手段を備えたスケルチ制御方式において、前
記送信端局に前記監視制御部の障害時に動作する制御線
識別信号送出手段を備えていることを特徴とするスケル
チ制御方式。1. A control line identification signal provided in a monitoring control unit of a transmitting terminal in a wireless transmission line including a transmitting terminal using a non-regenerative relay system, at least one relay station, and a receiving terminal. The ID signal of the generator is used together with the control signal for the squelch operation, and the relay station and the receiving end station receive the I signal.
A squelch control method including D signal detection means, wherein the transmission terminal station includes a control line identification signal transmission means that operates when the monitoring control unit fails.
を出力するＩＤ信号発生器と、前記監視制御部から出力
されるＩＤ信号の断を検出して前記ＩＤ信号発生器を動
作させるＩＤ信号検出器と、前記ＩＤ信号発生器のＩＤ
信号を主信号に多重化する多重化器とを有することを特
徴とする請求項１記載のスケルチ制御方式。2. An ID signal generator for outputting an ID signal by said control line identification signal transmitting means, and an ID signal for operating said ID signal generator by detecting disconnection of an ID signal output from said monitoring control unit. A detector and an ID of the ID signal generator
2. The squelch control method according to claim 1, further comprising a multiplexer for multiplexing a signal into a main signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22554591A JP2745890B2 (en) | 1991-09-05 | 1991-09-05 | Squelch control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22554591A JP2745890B2 (en) | 1991-09-05 | 1991-09-05 | Squelch control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0563591A JPH0563591A (en) | 1993-03-12 |
| JP2745890B2 true JP2745890B2 (en) | 1998-04-28 |
Family
ID=16830974
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22554591A Expired - Fee Related JP2745890B2 (en) | 1991-09-05 | 1991-09-05 | Squelch control method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2745890B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4729591B2 (en) * | 2008-02-13 | 2011-07-20 | 株式会社エヌ・ティ・ティ・ドコモ | Non-regenerative radio relay apparatus, radio communication system, and radio signal relay method |
| JP2010068157A (en) * | 2008-09-09 | 2010-03-25 | Hochiki Corp | Squelch and relay station apparatus for broadcast |
-
1991
- 1991-09-05 JP JP22554591A patent/JP2745890B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0563591A (en) | 1993-03-12 |
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