JPS6137817B2 - - Google Patents
Info
- Publication number
- JPS6137817B2 JPS6137817B2 JP9318280A JP9318280A JPS6137817B2 JP S6137817 B2 JPS6137817 B2 JP S6137817B2 JP 9318280 A JP9318280 A JP 9318280A JP 9318280 A JP9318280 A JP 9318280A JP S6137817 B2 JPS6137817 B2 JP S6137817B2
- Authority
- JP
- Japan
- Prior art keywords
- code
- carrier wave
- discriminator
- transmitting
- end code
- 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
- 230000003321 amplification Effects 0.000 claims 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims 2
- 230000008054 signal transmission Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
- H04H20/59—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for emergency or urgency
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B27/00—Alarm systems in which the alarm condition is signalled from a central station to a plurality of substations
- G08B27/008—Alarm systems in which the alarm condition is signalled from a central station to a plurality of substations with transmission via TV or radio broadcast
Description
【発明の詳細な説明】
本発明は特定情報信号を放送電波で送り受信側
で該特定情報信号を検知し、これにより音声出力
を自動的に制御する機能を有する特定信号送受信
装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a specific signal transmitting/receiving device having a function of transmitting a specific information signal via broadcast radio waves, detecting the specific information signal on the receiving side, and automatically controlling audio output accordingly. .
この種の送受信機として、たとえば、緊急放送
送受信機がある。これは、地震、津波などの緊急
事態発生時に、放送局から特定のコードが送出さ
れると、これを受信機側で検知し、優先的にこの
情報を聴取できるようにしたもので、仮に、受信
機のスイツチが切断されていても（ただし、高周
波部、検波部は常に動作しており、低周波部のみ
が切断されている）、自動的に動作状態となり、
上記緊急情報を聞くことができるようにしたもの
である。 An example of this type of transceiver is an emergency broadcast transceiver. This is a system in which when a specific code is sent out from a broadcasting station in the event of an emergency such as an earthquake or tsunami, the receiver detects this and listens to this information with priority. Even if the receiver switch is disconnected (however, the high frequency section and detection section are always operating, and only the low frequency section is disconnected), it will automatically enter the operating state.
This allows you to listen to the emergency information mentioned above.
ところが、この種の受信機に、正規の放送電波
以外に、いたずらや妨害電波により上記特定のコ
ードと同様の信号が入力されると、受信機はこれ
に応答し、緊急放送以外の音声がスピーカから発
声されることになり、聴取者側で混乱を生ずる恐
れがある。特に、上記特定のコードが一般の放送
番組と同じ周波数帯域内に存在する場合は、上記
特定コードが放送された時に市販のテープレコー
ダで容易に録音され、このテープを基にして、い
たずら電波が発射されることは十分考えられるこ
とである。 However, if a signal similar to the above specific code is input to this type of receiver due to a prank or jamming in addition to the regular broadcast waves, the receiver will respond and the sound other than the emergency broadcast will be transmitted to the speaker. This may cause confusion on the part of the listener. In particular, if the above-mentioned specific code exists in the same frequency band as a general broadcast program, it can be easily recorded with a commercially available tape recorder when the above-mentioned specific code is broadcast, and prank radio waves can be generated based on this tape. It is quite possible that it will be fired.
本発明は、この種の受信機が上記のいたずらや
妨害電波により誤動作しないようにするための方
式に関するものである。以下、本発明について、
実施例の図面と共に説明する。第１図に本発明に
よる信号送受信装置のブロツク構成図を示す。 The present invention relates to a method for preventing this type of receiver from malfunctioning due to the above-mentioned tampering or jamming waves. Below, regarding the present invention,
This will be explained with reference to drawings of examples. FIG. 1 shows a block diagram of a signal transmitting and receiving apparatus according to the present invention.
同図の送信部において緊急放送開始コード発生
器１、情報信号伝送部３、終了コード発生器４の
出力は混合器５で混合され、変調器６において搬
送波発生器８から得られる搬送波を変調する。変
調器６の出力は搬送波断続制御器２によつて制御
される搬送波断続器７、送信部９を経て、送信ア
ンテナ１０から電波として発射される。送信部９
の出力信号の１例を図示すると第２図のようにな
つており、開始コード、搬送波断続、開始コー
ド、緊急ニユースアナウンス、終了コードの順序
で配列され、一連の緊急放送信号を構成してい
る。一方、第１図の受信部において、緊急放送電
波は受信アンテナ１５でキヤツチされ、受信部１
６で増幅、検波される。このうち、開始コードお
よび終了コードはコード判別器１９で判別され、
その出力は開始コードにより「ハイレベル」にな
り終了コードで「ローレベル」に戻される。ま
た、搬送波の断続は搬送波断続判別器２０により
判別される。上記搬送波断続判別器２０は、たと
えば、RFアンプやIFアンプのAGC電圧の変化を
検知し、この変化の回数を計数し、所定の回数だ
け検知すればその出力は「ハイレベル」とし、上
記終了コード判別出力により「ローレベル」にリ
セツトされるような回路構成で実現できる。この
ようにして得られる上記搬送波断続判別器２０の
出力およびコード判別器１９の出力はアンドゲー
ト２１に供給され、両出力が「ハイレベル」の時
のみ、制御スイツチ２２を駆動する。低周波増幅
部１７は上記制御スイツチ２２の導通で動作状態
となり、受信部１６で検波された緊急情報がスピ
ーカ１８より音声として聴取者に伝えられる。 In the transmitter shown in the figure, the outputs of the emergency broadcast start code generator 1, information signal transmitter 3, and end code generator 4 are mixed in a mixer 5, and a modulator 6 modulates the carrier wave obtained from the carrier wave generator 8. . The output of the modulator 6 passes through a carrier wave interrupter 7 controlled by a carrier wave interrupter 2 and a transmitter 9, and is emitted as a radio wave from a transmitting antenna 10. Transmission section 9
An example of the output signal is shown in Fig. 2, where the start code, carrier wave intermittent, start code, emergency news announcement, and end code are arranged in the order, forming a series of emergency broadcast signals. . On the other hand, in the receiving section of FIG. 1, emergency broadcast radio waves are caught by the receiving antenna 15, and
6 is amplified and detected. Among these, the start code and the end code are discriminated by a code discriminator 19,
Its output goes "high level" with the start code and returns to "low level" with the end code. Furthermore, carrier wave discontinuity is determined by a carrier wave discontinuity discriminator 20. The carrier wave discontinuity discriminator 20 detects, for example, a change in the AGC voltage of an RF amplifier or an IF amplifier, counts the number of times this change occurs, and if a predetermined number of times is detected, the output is set to a "high level" and the above-mentioned ends. This can be realized with a circuit configuration that is reset to "low level" by the code discrimination output. The output of the carrier discontinuity discriminator 20 and the output of the code discriminator 19 obtained in this way are supplied to an AND gate 21, which drives the control switch 22 only when both outputs are at "high level". The low frequency amplifying section 17 becomes operational when the control switch 22 is turned on, and the emergency information detected by the receiving section 16 is transmitted to the listener as audio from the speaker 18.
このように本発明では、緊急放送の開始を搬送
波の断続を利用して伝えているが、これは通常の
ラジオやチユーナの出力または検波出力端には現
われない信号成分であり、最初に説明したような
緊急放送の特定コードが市販のテープレコーダに
録音され、これがいたずら電波に利用されるとい
う恐れが非常に少なくなるものである。しかも、
本発明によれば開始コード、終了コードおよび搬
送波の断続を併用しているので誤動作（動作しな
くても良い時に動作する）や不動作（動作すべき
時に動作しない）などのトラブルが非常に少なく
なり、かつ、妨害にも強くなるというすぐれた効
果を得ることができる。なお、第２図に送信され
る信号の配列を示しているが、これ以外に、情報
アナウンスが始まる前の開始コードと搬送波断続
の組合せを複数回繰り返すことも必要に応じて可
能である。 In this way, in the present invention, the start of emergency broadcasting is communicated using intermittent carrier waves, but this is a signal component that does not appear at the output or detection output end of a normal radio or tuner, and as explained at the beginning. This greatly reduces the possibility that a specific code for such an emergency broadcast will be recorded on a commercially available tape recorder and used as a prank radio wave. Moreover,
According to the present invention, since a start code, an end code, and intermittent carrier waves are used together, troubles such as malfunction (operating when it shouldn't be) and non-operation (not operating when it should be) are extremely rare. You can obtain the excellent effect of becoming more resistant to interference. Although FIG. 2 shows the arrangement of signals to be transmitted, it is also possible to repeat the combination of the start code and carrier intermittent multiple times before the information announcement starts, if necessary.
第１図は本発明の送受信装置の一実施例を示す
ブロツク図、第２図は送信される信号の内容の１
例を示す説明図である。
１……開始コード発生器、２……搬送波断続制
御器、４……終了コード発生器、１９……コード
判別器、２０……搬送波断続判別器。
Fig. 1 is a block diagram showing an embodiment of the transmitting/receiving device of the present invention, and Fig. 2 shows one example of the contents of the signal to be transmitted.
It is an explanatory diagram showing an example. 1... Start code generator, 2... Carrier wave intermittent controller, 4... End code generator, 19... Code discriminator, 20... Carrier wave intermittent discriminator.
Claims (1)
側で該所定の情報コードを検出することにより、
低周波増幅部の出力レベルを制御するように構成
した特定信号送受信装置において、送信側には開
始および終了コード発生器、搬送波断続制御器、
情報信号伝送部を具備し、開始コードの変調と搬
送波断続の組合せで放送を開始し、終了コードの
変調で放送を終了するとともに、受信側には開始
および終了コード判別器、搬送波断続判別器を具
備し、上記両判別器の出力によつて低周波増幅部
の出力レベルを制御するよう構成したことを特徴
とする特定信号送受信装置。1. By sending a predetermined information code from the transmitting side and detecting the predetermined information code on the receiving side,
In a specific signal transmitting/receiving device configured to control the output level of a low frequency amplification section, the transmitting side includes a start and end code generator, a carrier wave intermittent controller,
It is equipped with an information signal transmission section, starts broadcasting by a combination of start code modulation and carrier wave discontinuity, and ends broadcasting by end code modulation, and is equipped with a start and end code discriminator and a carrier wave discontinuity discriminator on the receiving side. 1. A specific signal transmitting/receiving device, comprising: an output level of a low frequency amplification section based on the outputs of both of the discriminators.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9318280A JPS5718138A (en) | 1980-07-07 | 1980-07-07 | Specific signal sending and receiving equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9318280A JPS5718138A (en) | 1980-07-07 | 1980-07-07 | Specific signal sending and receiving equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5718138A JPS5718138A (en) | 1982-01-29 |
| JPS6137817B2 true JPS6137817B2 (en) | 1986-08-26 |
Family
ID=14075427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9318280A Granted JPS5718138A (en) | 1980-07-07 | 1980-07-07 | Specific signal sending and receiving equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5718138A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59204321A (en) * | 1983-05-06 | 1984-11-19 | Sharp Corp | Receiver for emergency warning broadcast |
| JPS6413444A (en) * | 1987-07-08 | 1989-01-18 | Hitachi Ltd | Nuclear magnetic resonance apparatus |
| EP0457069B1 (en) * | 1990-05-10 | 1997-02-26 | Spectrospin Ag | Method and apparatus for the compensation of undesirable sidebands in nuclear magnetic resonance spectra |
-
1980
- 1980-07-07 JP JP9318280A patent/JPS5718138A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5718138A (en) | 1982-01-29 |
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