JPS5879391A - Terminal control system in catv system - Google Patents

Terminal control system in catv system

Info

Publication number
JPS5879391A
JPS5879391A JP56177709A JP17770981A JPS5879391A JP S5879391 A JPS5879391 A JP S5879391A JP 56177709 A JP56177709 A JP 56177709A JP 17770981 A JP17770981 A JP 17770981A JP S5879391 A JPS5879391 A JP S5879391A
Authority
JP
Japan
Prior art keywords
signal
terminal
signals
information
modulator
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.)
Granted
Application number
JP56177709A
Other languages
Japanese (ja)
Other versions
JPS6362153B2 (en
Inventor
Hirobumi Higuchi
博文 樋口
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yagi Antenna Co Ltd
Original Assignee
Yagi Antenna Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Yagi Antenna Co Ltd filed Critical Yagi Antenna Co Ltd
Priority to JP56177709A priority Critical patent/JPS5879391A/en
Publication of JPS5879391A publication Critical patent/JPS5879391A/en
Publication of JPS6362153B2 publication Critical patent/JPS6362153B2/ja
Granted legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/16Analogue secrecy systems; Analogue subscription systems
    • H04N7/162Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To control a terminal with an amplitude modulation component of a multiplex modulation signal, by performing constant amplitude modulation for information or a data signal and amplitude-modulating this constant amplitude modulation signal with a control signal for terminal selection. CONSTITUTION:A TV signal is received at an antenna 1, amplified at an amplifier 2 and transmitted to a transmission cable 4 via a mixer 3. Information or data signals are frequency-modulated at an FM modulator 6 to be FM signals and the signals are applied to an AM modulator 7. Individual oscillators 511- 51n output signals of different frequencies f1-fn, and the output is applied to the AM modulator 7 via switches 521-51n. In depressing the switch 521, the FM signal is AM-modulated at the frequency f1 and transmitted to the cable 4. Residences 101-10n at the reception side separate the FM-AM signals, and demodulate the AM signals for the control of terminal.

Description

【発明の詳細な説明】 る。[Detailed description of the invention] Ru.

CATVシステムにおいては、中央の送信設備から端末
側へ、情報あるいはデータ等を、特定の住居、ブロック
等を選別して伝送する場合。
In a CATV system, when information or data is transmitted from the central transmission equipment to the terminal side by selecting specific residences, blocks, etc.

送46設備側で選別のための端末制御を行わなければな
らない、これらの情報あるいはデータは特定周波数で変
調され、伝送ケーブルに送シ込まれ各一端末にて告知さ
れる。
This information or data, which must be controlled by terminals for sorting on the transmission equipment side, is modulated at a specific frequency, transmitted to a transmission cable, and announced at each terminal.

従来、この端末制御方式としては、端末の住居あるいは
ブロック毎に周波数を割シ当てる周波数分割方式、又は
伝送ケーブルを多条に併設する方式、あるいは特別の信
号を情報、データ中に重畳し伝送する方式等がある。
Conventionally, this terminal control method includes a frequency division method in which frequencies are assigned to each terminal residence or block, a method in which multiple transmission cables are installed, or a special signal is superimposed on information or data for transmission. There are methods etc.

しかしながら、いずれの方式もシステム全体が非常に複
雑となり、これに伴い各住居あるいはブロックの端末機
も複雑とな如、経済的にも高価なものとなる。
However, in either method, the entire system becomes very complicated, and the terminals in each residence or block are also complicated, making it economically expensive.

この発明は上記実情Kgみてなされたもので。This invention was made in view of the above actual situation.

その目的は、端末の選択並びに端末制御を容為にかつ経
済的に行うことのできるCATVシステムの端末制御方
式を提供することにある。
The purpose is to provide a terminal control method for a CATV system that allows terminal selection and terminal control to be carried out easily and economically.

この発明は、情報あるいはデータ信号を変調し、伝送ケ
ーブルに送出する場合、特別の変調を行い、その変調信
号により端末を制御するものである。
In this invention, when information or data signals are modulated and sent to a transmission cable, special modulation is performed and a terminal is controlled by the modulated signal.

情報あるいはデータを伝送する場合の変調方式として、
この発明においては1周波数変調(FM)、位相変調(
PM)、あるいは周波数シフ)(FSK)変調方式等が
用いられ冬が、これらのうち振幅が被変調波に左右され
ず常に効 一定である変調方式のみ有卦とされる。例えば。
As a modulation method for transmitting information or data,
In this invention, one frequency modulation (FM), phase modulation (
PM) or frequency shift) (FSK) modulation methods are used, but among these modulation methods, only modulation methods whose amplitude is not affected by the modulated wave and whose effectiveness is always constant are considered valid. for example.

周波数変調の場合、情報あるいはデータ信号にて搬送波
の周波数を変化させ゛伝送する。この変調された情報あ
るいはデータ信号等を元の信号として取シ出す場合、端
末に受信機を設置し、復調すればよい。また、これらの
復調器には。
In the case of frequency modulation, information or data signals are transmitted by changing the frequency of a carrier wave. If this modulated information or data signal is to be extracted as an original signal, a receiver may be installed in the terminal and demodulated. Also, these demodulators.

振幅制限回路(リミッタ回路)があシ、この振幅制限回
路にて雑音成分等が取シ除かれることは周知の通シであ
る。
It is well known that an amplitude limiting circuit (limiter circuit) is used to remove noise components and the like.

この発明は、この振幅制限回路の動作に着目し、前述の
FMあるいはPM等の振幅一定の搬送波をさらに、端末
制御を行うための特定周波数おるいはコード化された/
母ルス信号(制御信号)で振幅変調(AM)を行い、所
謂FNム−AM。
The present invention focuses on the operation of this amplitude limiting circuit, and further converts the above-mentioned FM or PM carrier wave with a constant amplitude into a specific frequency or coded/coded carrier wave for terminal control.
Amplitude modulation (AM) is performed using the base pulse signal (control signal), so-called FN-AM.

PM−AMといった多重変調を行って伝送ケーブルに送
出する。そして、この多重変調信号を端末の受信機で受
信する場合は、AM信号を制御用1.FM又はPM信号
を情報あるいはデータ信号として復調するものである。
It performs multiple modulation such as PM-AM and sends it out to a transmission cable. When this multiplex modulated signal is received by the receiver of the terminal, the AM signal is used as the control signal 1. It demodulates FM or PM signals as information or data signals.

制御用のAM信号は、エンベロープ検波し、この検波信
号で端末を制御することによυ容易に送信側から端末を
制御することができる。
The AM signal for control is subjected to envelope detection, and by controlling the terminal using this detected signal, the terminal can be easily controlled from the transmitting side.

なお、振幅変調する際の変調度は、端末の受信機の振幅
制限回路の特性に左右されるため、この回路の動作内で
行わなければならない。
Note that the degree of modulation when performing amplitude modulation depends on the characteristics of the amplitude limiting circuit of the receiver of the terminal, so it must be performed within the operation of this circuit.

以下1図面を参照してこの発明の一実施例を説明する。An embodiment of the present invention will be described below with reference to one drawing.

第1図はシステム全体の構成図である。同図において、
1はテレピノコン受信用アンテナ%2は受信した電波(
テレビジョン信号)を増幅するための増幅器、3はテレ
ビジョン信号と、情報、データ等の信号とを混合して伝
送ケーブル4に送出するための混合器、5は端末の例え
ば住居を選択する丸めの制御信号を出力する個別発振器
、εは情報あるいはデータ等の信号を周波数変調するた
めのF” M変調器、7はFM変調器6から出力された
FM信号を個別発振器5の発振周波数でさらに振幅変調
するためのAM変調器である。なお、11はこれらの機
器によシ構成される送信設備を示す。
FIG. 1 is a block diagram of the entire system. In the same figure,
1 is the antenna for receiving TV console% 2 is the received radio wave (
3 is a mixer for mixing the television signal with signals such as information and data and sending the mixture to transmission cable 4; 5 is a rounding device for selecting the residence of the terminal, for example; ε is an F''M modulator for frequency modulating signals such as information or data, and 7 further converts the FM signal output from the FM modulator 6 at the oscillation frequency of the individual oscillator 5. This is an AM modulator for amplitude modulation.The reference numeral 11 indicates a transmission facility constituted by these devices.

テレビジョン信号は、アンテナJで受信され。The television signal is received by antenna J.

増幅器2で増幅された後、混合器3を介して伝送ケーブ
ル4に送出される。これらは通常行われるCATVにお
ける再送信と同じである。
After being amplified by an amplifier 2, the signal is sent to a transmission cable 4 via a mixer 3. These are the same as retransmissions normally performed in CATV.

情報あるいはデータ信号は、FM変調器6の入力端61
に入力する。そして、この−FM、変調器6で周波数変
調されFM信号となF)、82図(aJに示すような波
形となる。このFM変調器6の出力は、次のAM変調器
7に供給され1個別発振器5からの出力信号で振幅変調
される。この個別発振器5は、個別選択用発振器511
゜512−5111群及びスイッチ521,5:12・
・・52n@fζよシ構成されている。@別発振器51
1.51:l・・・51mはそれぞれ異なる周波数’l
*  ’m・・・fnの信号を出力し、との出旭スイッ
チ52 J e 5 J J ”・5 J nを介して
AM変調器1へ供給される。
The information or data signal is sent to the input 61 of the FM modulator 6.
Enter. Then, this -FM is frequency modulated by the modulator 6 and becomes an FM signal with a waveform as shown in Fig. 82 (aJ).The output of this FM modulator 6 is supplied to the next AM modulator 7. 1 The amplitude is modulated by the output signal from the individual oscillator 5. This individual oscillator 5 is connected to the individual selection oscillator 511.
゜512-5111 group and switch 521, 5:12・
...It is composed of 52n@fζ. @ Separate oscillator 51
1.51:l...51m are different frequencies'l
* 'm...fn signals are outputted and supplied to the AM modulator 1 via the output switch 52 J e 5 J J ''.5 J n.

第2図(klは例えば個別発振器511の発振出力’I
s第2図(C)は個別発振器512の発振出力fsをそ
れぞれ示している。また第2図(dlはFM変調器6に
て周波数変調された情報あるいはデータ信号が、さらに
発振出力f1によシ振て伝送ケーブル4へ送出される。
FIG. 2 (kl is the oscillation output 'I' of the individual oscillator 511, for example)
s FIG. 2(C) shows the oscillation output fs of the individual oscillator 512, respectively. Further, in FIG. 2 (dl), the information or data signal frequency-modulated by the FM modulator 6 is further oscillated by the oscillation output f1 and sent to the transmission cable 4.

第2図(diは同じく周波数変調された情報あるいはデ
ータ信号がさらに発振出力f禽によ#)振幅変調された
FM−AM信号である。発振出力f’l * ’4・・
・inについても同様に二重変調された信号となり、伝
送ケーブル4に送出される。
FIG. 2 (di is an FM-AM signal in which the frequency-modulated information or data signal is further amplitude-modulated by the oscillation output f). Oscillation output f'l * '4...
・In is also a double modulated signal and sent to the transmission cable 4.

これら伝送ケーブル4に送出された検電はタッグオフj
で分配あるいは分岐され、保安器9を介し、各端末の住
居1171.J(1,・・・10Bに供給される。
The voltage detection sent to these transmission cables 4 is a tag-off j
It is distributed or branched at the residence 1171. of each terminal via the protector 9. J(1,...supplied to 10B.

端末の住居103.Jol・・・Jlllfiの各ゾロ
ツクにおいて、Jamは分配器、Jobはテレビジョン
受信機、10CはFM−AM信号に変調された情報ある
いはデータ信号を受信する端末受信機である。
Terminal residence 103. In each of Jol...Jlllfi, Jam is a distributor, Job is a television receiver, and 10C is a terminal receiver that receives information or data signals modulated into FM-AM signals.

第3図は端末受信機IQcの詳細を示すブロック図であ
る。同図において、100は入力端子、101はチュー
ナ、102は帯域ろ波器、103は中間周波増幅器、1
04は分配器、JO5は振幅制御回路(リミッタ回路)
何周波数弁別器、106は音声周波増幅器、107はス
ピーカ、JOBはAM成分検波回路、109は個別選択
用帯域ろ波器、110は整流回路、111はリレー駆動
用の直流増幅器、112はリレー回路、113は直流電
源回路、114はtbnプラグである。
FIG. 3 is a block diagram showing details of the terminal receiver IQc. In the figure, 100 is an input terminal, 101 is a tuner, 102 is a bandpass filter, 103 is an intermediate frequency amplifier, 1
04 is a distributor, JO5 is an amplitude control circuit (limiter circuit)
106 is an audio frequency amplifier, 107 is a speaker, JOB is an AM component detection circuit, 109 is a bandpass filter for individual selection, 110 is a rectifier circuit, 111 is a DC amplifier for driving a relay, 112 is a relay circuit , 113 is a DC power supply circuit, and 114 is a TBN plug.

すなわち、端末受信機10Gに供給されたFM−AM(
’a号は、チューナ101にて中間周波数にされ、帯域
ろ波器102にて不要信号が除去された後、中間周波増
幅器103によシ増幅される。この中間周波増幅器JO
Bの出力は。
That is, the FM-AM (
'a' is set to an intermediate frequency by a tuner 101, unnecessary signals are removed by a bandpass filter 102, and then amplified by an intermediate frequency amplifier 103. This intermediate frequency amplifier JO
The output of B is.

分配器xo4によF)分配され、FM@1lkll系b
M復調系にそれぞれ供給される。
F) distributed by distributor xo4, FM@1lkll system b
The signals are respectively supplied to the M demodulation systems.

AMa調系に供給されたF’M−AM信号は、AM成分
をエンベロー!検波する検波器108にて、送信側で変
調した個別発振器5からの周波数’1s’、!・・・f
nが復調される。この復調された信号は1個別選択用帯
域ろ波器109を経て、さらに整流器7717で整流さ
れ直流電圧となる。この直流電圧は、リレー駆動用の直
流増幅器111によ)電流増幅された後、リレー回路J
72に供給されリレーを駆動する。リレーが駆動すると
、直流電源回路113からの電源が音声周波増幅器10
Bに供給される。
The F'M-AM signal supplied to the AMa tone system envelopes the AM component! The frequency '1s' from the individual oscillator 5 modulated on the transmitting side is detected by the detector 108! ...f
n is demodulated. This demodulated signal passes through one individual selection bandpass filter 109 and is further rectified by a rectifier 7717 to become a DC voltage. This DC voltage is current-amplified by a relay-driving DC amplifier 111), and then the relay circuit J
72 and drives the relay. When the relay is driven, power from the DC power supply circuit 113 is applied to the audio frequency amplifier 10.
B is supplied.

一方、FMa調系に供給されたFM−AM信号は、振幅
制限回路付周波数弁別器105に送られ、端末制御用と
してのAM成分が除去されて周波数復調された後、音声
周波増幅器106に供給される。これにより音声周波増
幅器106から出力が得られ、スピーカ101から告知
される。
On the other hand, the FM-AM signal supplied to the FMa modulation system is sent to the frequency discriminator 105 with an amplitude limiting circuit, where the AM component for terminal control is removed and frequency demodulated, and then supplied to the audio frequency amplifier 106. be done. As a result, an output is obtained from the audio frequency amplifier 106, and an announcement is made from the speaker 101.

この場合、送信側の個別発振器5において選択した端末
の住居、例えば住居10Hに合致する制御信号がある場
合のみ、音声周波増幅器106が動作し、告知されるが
、もし合致する制御信号がない場合は音声周波増幅器1
06は動作せず、告知されない。これは住居701〜I
onの動作についても同様である。
In this case, the audio frequency amplifier 106 operates and is notified only when there is a control signal that matches the residence of the terminal selected in the individual oscillator 5 on the transmitting side, for example, the residence 10H, but if there is no matching control signal is audio frequency amplifier 1
06 does not operate and is not announced. This is residence 701-I
The same applies to the on operation.

尚、上記実施例においては、一方向の受信制御部につい
て説明したが、双方向CATVシステムにおいて端末制
御を行う場合の端末からの上り信号をも制御できること
は言うまでもない。
In the above embodiment, a one-way reception control unit has been described, but it goes without saying that uplink signals from terminals can also be controlled when terminal control is performed in a two-way CATV system.

以上のようにこの発明によれば、情報あるいはデータ信
号の定振幅変調を行い、さらにこの定振幅変調信号を端
末選択用の制御信号により振幅変調し、この多重変調信
号の振幅変調成分にて端末を制御するようにしたので、
端末の選択並びに端末制御が容易かつ経済的であるov
−’rvシステムの端末制御方式を提供できる。
As described above, according to the present invention, an information or data signal is subjected to constant amplitude modulation, and this constant amplitude modulation signal is further amplitude-modulated by a control signal for terminal selection, and the amplitude modulation component of this multiplexed modulation signal is used for terminal selection. Since we controlled the
Terminal selection and terminal control are easy and economical.
- It is possible to provide a terminal control method for the 'rv system.

【図面の簡単な説明】[Brief explanation of drawings]

第1図はこの発明の一実施例に係るシステム構成を示す
ブロック図、第2図(a)〜(elはそれぞれ上記シス
テムにおけ、る各点の偵号波形図、第3図は上記システ
ムにおける端末受信機の構成を示すブロック図である。 1・・・テレビジョン受信アンテナ、3・・・混合器。 4・・・伝送ケーブル、5・・・個別発振器、511〜
5111・・・個別選択用発振器、521〜52n・・
・スイッチ、6・・・FM変調器、7・・−AM変調器
、101〜16n・・・端末住居、Ioc・・・端末受
信機。
FIG. 1 is a block diagram showing a system configuration according to an embodiment of the present invention, FIGS. 2(a) to (el) are reconnaissance waveform diagrams at each point in the above system, and FIG. 3 is a block diagram showing the system configuration according to an embodiment of the present invention. It is a block diagram showing the configuration of a terminal receiver in 1... Television reception antenna, 3... Mixer. 4... Transmission cable, 5... Individual oscillator, 511-
5111...Individual selection oscillator, 521-52n...
- Switch, 6...FM modulator, 7...-AM modulator, 101-16n...terminal residence, Ioc...terminal receiver.

Claims (1)

【特許請求の範囲】[Claims] 中央から情報あるいはデータ信号と共に端末選択用の制
御信号を送出し、端末の制御を行うCATVシステムに
おいて、前記情報あるいはデータ信号の定振幅変調を行
い、さらにこの定振幅変調信号を前記端末選択用の制御
信号により振幅変調し、この多重変調信号の振幅変調成
分にて前記端末を制御するようにしたことを特徴とする
CATVシステムにおける端末制御方式。
In a CATV system in which a control signal for terminal selection is sent from the center together with an information or data signal to control the terminal, the information or data signal is subjected to constant amplitude modulation, and this constant amplitude modulation signal is then transmitted to the control signal for terminal selection. 1. A terminal control method in a CATV system, characterized in that amplitude modulation is performed using a control signal, and the terminal is controlled using an amplitude modulation component of this multiplexed modulation signal.
JP56177709A 1981-11-05 1981-11-05 Terminal control system in catv system Granted JPS5879391A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56177709A JPS5879391A (en) 1981-11-05 1981-11-05 Terminal control system in catv system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56177709A JPS5879391A (en) 1981-11-05 1981-11-05 Terminal control system in catv system

Publications (2)

Publication Number Publication Date
JPS5879391A true JPS5879391A (en) 1983-05-13
JPS6362153B2 JPS6362153B2 (en) 1988-12-01

Family

ID=16035730

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56177709A Granted JPS5879391A (en) 1981-11-05 1981-11-05 Terminal control system in catv system

Country Status (1)

Country Link
JP (1) JPS5879391A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01107276U (en) * 1988-01-11 1989-07-19

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01107276U (en) * 1988-01-11 1989-07-19

Also Published As

Publication number Publication date
JPS6362153B2 (en) 1988-12-01

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