JPH0433172B2 - - Google Patents
Info
- Publication number
- JPH0433172B2 JPH0433172B2 JP3855684A JP3855684A JPH0433172B2 JP H0433172 B2 JPH0433172 B2 JP H0433172B2 JP 3855684 A JP3855684 A JP 3855684A JP 3855684 A JP3855684 A JP 3855684A JP H0433172 B2 JPH0433172 B2 JP H0433172B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- atis
- identification code
- squelch
- carrier
- 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
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/34—Muting amplifier when no signal is present
- H03G3/342—Muting when some special characteristic of the signal is sensed which distinguishes it from noise, e.g. using speech detector
Landscapes
- Mobile Radio Communication Systems (AREA)
- Transceivers (AREA)
- Noise Elimination (AREA)
Description
【発明の詳細な説明】
（技術分野）
本発明は無線機のスケルチ回路に使用される信
号方式の改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an improvement in a signal system used in a squelch circuit of a radio device.
（従来技術とその問題点）
第１図は従来の無線機のスケルチ動作を示す図
であり、横軸は時間軸である。１はキヤリア入力
信号、２は受信機中間周波段の復調出力信号、３
は無信号時の雑音、４は音声信号、５はスケルチ
回路の機能により得られた音声出力を開閉するス
ケルチ信号であり、“Ｈ”のとき開、“Ｌ”のとき
閉とする。６は信号５により制御された受信機出
力信号を示す。t1はキヤリア断からスケルチ回路
が応答する迄の遅延時間である。図に示すように
終話のときスケルチ動作をキヤリア断よりもt1だ
け遅らせた方が、短期フエージング等移動無線特
有の電界変動に対して、スピーカ出力の途切れに
よる聞きづらさがなくなるため、積極的にt1の遅
延を得るようにすることが一般的であるが、一方
キヤリア断のときにt1秒の間無信号雑音３がスピ
ーカから出力されるという欠点を有している。(Prior art and its problems) FIG. 1 is a diagram showing the squelch operation of a conventional radio device, and the horizontal axis is the time axis. 1 is the carrier input signal, 2 is the demodulated output signal of the receiver intermediate frequency stage, 3
is a noise when there is no signal, 4 is an audio signal, and 5 is a squelch signal for opening and closing the audio output obtained by the function of the squelch circuit, which is open when it is "H" and closed when it is "L". 6 shows the receiver output signal controlled by signal 5. t1 is the delay time from carrier disconnection until the squelch circuit responds. As shown in the figure, if the squelch operation is delayed by t1 at the end of a call than when the carrier is disconnected, the difficulty of hearing due to interruptions in the speaker output will be avoided in response to short-term fading and other electric field fluctuations peculiar to mobile radio. Although it is common to actively try to obtain a delay of t 1 , it has the disadvantage that when the carrier is cut off, no signal noise 3 is output from the speaker for t 1 seconds.
（目的）
本発明は、この欠点を除去するため、パーソナ
ル無線等の送信信号に変調されている。ATIS
（Automatic Transmitter Identification
System）信号を利用して、このATIS信号にあ
る種の認識信号を追加することによりスケルチ動
作を改良しようとするものである。(Objective) In order to eliminate this drawback, the present invention modulates a transmission signal of a personal radio or the like. ATIS
(Automatic Transmitter Identification
The aim is to improve the squelch operation by using the ATIS signal and adding a certain recognition signal to the ATIS signal.
（実施例）
第２図は本発明の通信方式をパーソナル無線通
信システムに適用した実施例を示す。図中第１図
と同一番号のものは同一機能、７はキヤリア立上
り時送出されるATIS信号、８は１分ごとに送出
されるATIS信号、９はキヤリア立下りに先立つ
て送出されるATIS信号、１０は１分ごとに送出
されるATIS信号８に付加された認識信号で、こ
のATIS信号は中間信号であることを示す符号で
ある。以下この動作を説明する。通話の初め、中
間（定期的）、終りにATIS信号等の識別符号を
自動的に送信する無線システムにおいて、通話の
初めおよび終り以外の中間のATIS信号に中間で
あることを示す認識信号１０を付加する。受信機
はATIS信号を識別するとともに認識信号１０を
検知し、キヤリア立上りから一定時間（立上り時
送出されるATIS信号が終了する迄の時間）はス
ケルチ機能に関してATIS信号を無視し、その後
のATIS信号に認識信号１０を検知しなければキ
ヤリア断の予告としてスケルチ機能を閉とする。
従つてキヤリア断時発生する雑音に対し、すべに
音声出力回路は閉となつているのでスピーカから
雑音が出力されることはない。一方フエージング
等の瞬時電界低下に対しては、ATIS信号を識別
しないためスケルチ機能が断となることはない。(Embodiment) FIG. 2 shows an embodiment in which the communication method of the present invention is applied to a personal wireless communication system. In the figure, the same numbers as in Figure 1 have the same functions; 7 is the ATIS signal sent out at the rising edge of the carrier; 8 is the ATIS signal sent out every minute; 9 is the ATIS signal sent out before the falling edge of the carrier. , 10 is a recognition signal added to the ATIS signal 8 sent every minute, and is a code indicating that this ATIS signal is an intermediate signal. This operation will be explained below. In a wireless system that automatically transmits an identification code such as an ATIS signal at the beginning, middle (regularly), and end of a call, a recognition signal 10 indicating that the ATIS signal is in the middle is attached to an intermediate ATIS signal other than the beginning and end of a call. Add. The receiver identifies the ATIS signal and detects the recognition signal 10, and ignores the ATIS signal with respect to the squelch function for a certain period of time from the rise of the carrier (the time until the ATIS signal sent at the rise ends), and then ignores the ATIS signal after that. If the recognition signal 10 is not detected, the squelch function is closed as a notice of carrier disconnection.
Therefore, with respect to noise generated when the carrier is cut off, all audio output circuits are closed, so no noise is output from the speaker. On the other hand, in the case of instantaneous electric field drops such as fading, the squelch function will not be interrupted because the ATIS signal is not recognized.
（効果）
以上説明したごとく本発明によれば、通話の終
り（キヤリア断）と同時にスケルチを閉じるので
無信号雑音の出力を除くことができ、かつフエー
ジングに対してもスケルチ動作による聞きづらさ
を防止できる。(Effects) As explained above, according to the present invention, since the squelch is closed at the same time as the end of the call (carrier disconnection), the output of no-signal noise can be eliminated, and the squelch operation can also prevent fading from making it difficult to hear. can be prevented.
第１図は従来の無線機のスケルチ動作を示す説
明図。第２図は本発明の実施例を示す同上説明図
である。
１：キヤリア信号、２：復調出力信号、３：無
信号雑音、４：音声信号、５：スケルチ信号、
６：受信機出力信号、７〜９：ATIS信号、１
０：中間ATISに付加した認識信号。
FIG. 1 is an explanatory diagram showing the squelch operation of a conventional radio device. FIG. 2 is an explanatory diagram showing an embodiment of the present invention. 1: carrier signal, 2: demodulated output signal, 3: no signal noise, 4: audio signal, 5: squelch signal,
6: Receiver output signal, 7-9: ATIS signal, 1
0: Recognition signal added to intermediate ATIS.
Claims (1)
び通話中に一定時間間隔でATIS信号等の識別符
号を変調して送出し、これを受信側で受信する通
信システムにおいて、前記通話中の一定時間間隔
で変調されるATIS信号等の識別符号に、中間信
号であることを認識できる認識信号を重畳し、受
信側では受信機の立上り時を除いて、ATIS信号
等の識別符号と中間信号を復調し、前記認識信号
の無いATIS信号等の識別符号を検知したとき、
受信機を待受状態に戻すことを特徴とする信号方
式。1. In a communication system in which an identification code such as an ATIS signal is modulated and sent from the transmitting side at the rise and fall of a transmission signal and at fixed time intervals during a call, and is received by the receiving side, A recognition signal that can be recognized as an intermediate signal is superimposed on the identification code such as the ATIS signal that is modulated at time intervals, and the receiving side receives the identification code such as the ATIS signal and the intermediate signal except when the receiver starts up. When demodulating and detecting an identification code such as an ATIS signal without the recognition signal,
A signaling system characterized by returning the receiver to standby mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3855684A JPS60183830A (en) | 1984-03-02 | 1984-03-02 | Signal system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3855684A JPS60183830A (en) | 1984-03-02 | 1984-03-02 | Signal system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60183830A JPS60183830A (en) | 1985-09-19 |
| JPH0433172B2 true JPH0433172B2 (en) | 1992-06-02 |
Family
ID=12528562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3855684A Granted JPS60183830A (en) | 1984-03-02 | 1984-03-02 | Signal system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60183830A (en) |
-
1984
- 1984-03-02 JP JP3855684A patent/JPS60183830A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60183830A (en) | 1985-09-19 |
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