JPS6170881A - Volume control of terminal equipment in catv system - Google Patents
Volume control of terminal equipment in catv systemInfo
- Publication number
- JPS6170881A JPS6170881A JP19294084A JP19294084A JPS6170881A JP S6170881 A JPS6170881 A JP S6170881A JP 19294084 A JP19294084 A JP 19294084A JP 19294084 A JP19294084 A JP 19294084A JP S6170881 A JPS6170881 A JP S6170881A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- control signal
- volume
- catv system
- amplifier
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本願発明はＣＡＴＶシステムで緊急放送とか重実な放送
等を行なう場合に、センターから制御信号を伝送して端
末機のボリュウムが最大になるよう自動的に制御する方
法に関するものである。[Detailed Description of the Invention] (Industrial Application Field) The present invention transmits a control signal from the center to automatically maximize the volume of the terminal when performing emergency broadcasts or important broadcasts in a CATV system. This relates to a method of controlling
（従来の技術）
ＣＡＴＶシステムでは緊急放送とか重要な放送だけでな
くＢＧＭ放送とかその他各種の放送が行なわれている。(Prior Art) In the CATV system, not only emergency broadcasts and important broadcasts, but also BGM broadcasts and various other broadcasts are performed.
これらの放送を受信する各端末の加入者はＢＧＭ放送の
ように特に重要でない放送のときはボリュウム（Ｖ Ｒ
）を絞って受信することがある。Subscribers of terminals that receive these broadcasts can adjust the volume (V R
) may be received.
ＶＲを絞って受信すると緊急放送とか重要な放送等が行
なわれても加入者に聞こえないことがあり、それらの放
送が加入者に十分に告知されないという問題がある。If the VR is narrowed down, subscribers may not be able to hear even if emergency broadcasts or important broadcasts are made, and there is a problem that subscribers are not sufficiently notified of these broadcasts.
この問題を解決するため従来は、第３図に示すように通
常は放送信号Ｆａのみを伝蓬し、緊急放送時にはセンタ
ーから放送信号Ｆａの他に制御信号Ｆｃをも伝送し、こ
の制御信号Ｆｃにより加入者の受信機のＶＲを自動的に
最大に制御するようにしである。In order to solve this problem, in the past, as shown in Figure 3, normally only the broadcast signal Fa was transmitted, but in the event of an emergency broadcast, a control signal Fc was also transmitted from the center in addition to the broadcast signal Fa. This automatically controls the VR of the subscriber's receiver to the maximum.
（発明が解決しようとする問題点）
従来の伝送方法では制御信号Ｆｃと放送信号Ｆａの夫々
を別々の搬送波で伝送しているため従来の方法では送信
側の設備も受信側の設備も複雑になるという問題がある
。(Problems to be solved by the invention) In the conventional transmission method, the control signal Fc and the broadcast signal Fa are each transmitted using separate carrier waves, so in the conventional method, the equipment on the transmitting side and the equipment on the receiving side are complicated. There is a problem with becoming.
また従来の方法では搬送波が二つあるため受信側の構成
は第４図に示すように、放送信号Ｆａを伝送する経路と
、制御信号Ｆｃを伝送する経路とが別々に必要になるた
め受信側の設備も複雑になるどういう問題がある。In addition, in the conventional method, there are two carrier waves, so the configuration on the receiving side requires a separate path for transmitting the broadcast signal Fa and a path for transmitting the control signal Fc, as shown in Figure 4. The equipment is also complicated and there is no problem.
ちなみに第４図の受信回路はバンドパスフィルタ１−Ｒ
Ｆ増幅器２−ミキサー３−４Ｆ増幅器４−ＦＭ検波器５
−電子ポリュウム６−ＡＦ増幅器７−スピーカ８から構
成される放送信号伝送経路と、ハンドパスフィルタ１ｌ
−ＲＦ増幅器１２−ミキサー１３−ＩＦ増幅器１４−レ
ベル検波器１５から構成される制御信号伝送経路との二
つの経路からなる。By the way, the receiving circuit in Fig. 4 is a bandpass filter 1-R.
F amplifier 2-mixer 3-4F amplifier 4-FM detector 5
- Broadcast signal transmission path consisting of electronic polynomial 6 - AF amplifier 7 - speaker 8 and handpass filter 1l
It consists of two paths: - RF amplifier 12 - mixer 13 - IF amplifier 14 - and a control signal transmission path consisting of level detector 15.
（閘題点を解決するための手段）
本節発明の端末機のボリュウム制御方法は第１図に示す
ように、制御信号波Ｆｃを必要に応じて放送信号波Ｆａ
と共に伝送するようにし、しかも制御信号波Ｆｃを放送
信号波Ｆａに加えて複合信号として一つの搬送波で伝送
し、この信号を第２図に示す受信側で分離して端末機の
ＶＲを制御するようにしたものである。(Means for solving the problem) As shown in FIG. 1, the volume control method of the terminal according to the invention in this section is such that the control signal wave Fc is changed to the broadcast signal wave Fa as necessary.
In addition, the control signal wave Fc is added to the broadcast signal wave Fa and transmitted as a composite signal on one carrier wave, and this signal is separated on the receiving side as shown in Fig. 2 to control the VR of the terminal. This is how it was done.
第２図において２１はバンドパスフィルタ、２２はＲＦ
アンプ、２３はミキサー、２４は局部発振器、２５はＩ
Ｆ＃！！幅器、２６はＦＭ検波器、２７はステレオＩＣ
等による制御信号分離回路、２８は電子ボリュウム、２
９はＡＦアンプ、３ｏはスピーカーである。In FIG. 2, 21 is a bandpass filter, 22 is an RF
amplifier, 23 is mixer, 24 is local oscillator, 25 is I
F#! ! 26 is an FM detector, 27 is a stereo IC
etc., 28 is an electronic volume, 2
9 is an AF amplifier, and 3o is a speaker.
（作 用）
ＣＡＴＶシステムのセンターから伝送されて第２図の端
末器に入力される第１図の複合信号のうち放送信号波Ｆ
ａは、バンドパスフィルタ２ｌ−ＲＦアンプ２２を通り
、ミキサー２３で局部発振器２４からの信号と混合され
て中間周波信号に変換され、中間周波増幅器２５で増幅
され、ＦＭ検波器２６で検波され、制御信号分離回路２
７−−ｉｔ子ボリユウム２８を経てスピーカー３ｏから
放送される。(Function) Among the composite signals shown in Figure 1 that are transmitted from the center of the CATV system and input to the terminal equipment shown in Figure 2, the broadcast signal wave F
a passes through the bandpass filter 2l-RF amplifier 22, is mixed with the signal from the local oscillator 24 by the mixer 23, is converted into an intermediate frequency signal, is amplified by the intermediate frequency amplifier 25, is detected by the FM detector 26, Control signal separation circuit 2
7--It is broadcast from the speaker 3o via the secondary volume 28.
一方、複合４３号の制御信号は〃Ｉ御信号分＃回路２７
で分離され、この信号により電子ボリュウム２９が最大
になるよう制御され、スピーカー３゜から放送される音
声が自動的に大きくなる。On the other hand, the control signal of compound No. 43 is
This signal controls the electronic volume 29 to be at its maximum, and automatically increases the volume of the sound broadcast from the speaker 3°.
（発明の効果）
本発明の端末機のボリュウム制御方法は次のような効果
がある。(Effects of the Invention) The terminal volume control method of the present invention has the following effects.
（１）ボリュウムを制御する制御信号Ｆｃを放送信号Ｆ
ａとの複合信号としてセンターから伝送するため搬送波
が一つですむ、そのため送信側及び受信側の回路構成が
簡潔になる。(1) The control signal Fc that controls the volume is set to the broadcast signal F.
Since it is transmitted from the center as a composite signal with a, only one carrier wave is required, which simplifies the circuit configurations on the transmitting and receiving sides.
（２）送信側及び受信側の回路構成が簡潔になるため、
システムの信頼性が向上する。(2) The circuit configuration on the transmitting and receiving sides becomes simpler,
Improves system reliability.
（３）送信側及び受信側の回路構成が簡潔になるため１
部品点数が少なくなり、組立や調整等も容易になるため
生産コストが大幅に低減される。(3) Because the circuit configuration on the transmitting side and receiving side is simplified, 1
Since the number of parts is reduced and assembly and adjustment are easier, production costs are significantly reduced.
第１図は本発明における放送信号と制御信号の説明図、
第２図は本発明における受信側のブロック説明図、第３
図は従来の放送信号と制御信号の説明図、第４図は従来
の受信側のブロック説明図である。
２１はバンドパスフィルタ
２２はＲＦアンプ
２３はミキサー
２４は局部発振器
２５はＩＦ増幅器
２６はＦＭ検波器
２７は制御信号分離回路
２８は電子ボリュウム
２９はＡＦアンプ
３０はスピーカーFIG. 1 is an explanatory diagram of broadcast signals and control signals in the present invention,
Figure 2 is a block explanatory diagram of the receiving side in the present invention;
FIG. 4 is an explanatory diagram of a conventional broadcast signal and control signal, and FIG. 4 is a block explanatory diagram of a conventional receiving side. 21 is a band pass filter 22 is an RF amplifier 23 is a mixer 24 is a local oscillator 25 is an IF amplifier 26 is an FM detector 27 is a control signal separation circuit 28 is an electronic volume 29 is an AF amplifier 30 is a speaker
Claims (1)
複合信号として一つの搬送波でＣＡＴＶシステムのセン
ターから伝送し、受信側においてその制御信号を分離し
て同信号により端末機のボリュウムを制御するようにし
たＣＡＴＶシステムにおける端末機のボリュウム制御方
法The control signal that controls the volume of the terminal device is transmitted as a composite signal with the broadcast signal from the center of the CATV system on one carrier wave, and the control signal is separated on the receiving side and the volume of the terminal device is controlled using the same signal. Terminal volume control method in CATV system
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19294084A JPS6170881A (en) | 1984-09-14 | 1984-09-14 | Volume control of terminal equipment in catv system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19294084A JPS6170881A (en) | 1984-09-14 | 1984-09-14 | Volume control of terminal equipment in catv system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6170881A true JPS6170881A (en) | 1986-04-11 |
Family
ID=16299534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19294084A Pending JPS6170881A (en) | 1984-09-14 | 1984-09-14 | Volume control of terminal equipment in catv system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6170881A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01220590A (en) * | 1988-02-29 | 1989-09-04 | Nec Corp | Catv notifying system |
| US5031213A (en) * | 1988-09-21 | 1991-07-09 | Pioneer Electronic Corporation | CATV terminal unit |
| JP2006515122A (en) * | 2002-05-10 | 2006-05-18 | トムソン ライセンシング | Television signal receiver capable of receiving emergency warning signals |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58134588A (en) * | 1982-02-05 | 1983-08-10 | Hitachi Ltd | Television receiver for emergency alarm broadcast |
-
1984
- 1984-09-14 JP JP19294084A patent/JPS6170881A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58134588A (en) * | 1982-02-05 | 1983-08-10 | Hitachi Ltd | Television receiver for emergency alarm broadcast |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01220590A (en) * | 1988-02-29 | 1989-09-04 | Nec Corp | Catv notifying system |
| US5031213A (en) * | 1988-09-21 | 1991-07-09 | Pioneer Electronic Corporation | CATV terminal unit |
| JP2006515122A (en) * | 2002-05-10 | 2006-05-18 | トムソン ライセンシング | Television signal receiver capable of receiving emergency warning signals |
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