JPH0481035A - Tv transmitter/receiver - Google Patents
Tv transmitter/receiverInfo
- Publication number
- JPH0481035A JPH0481035A JP19238390A JP19238390A JPH0481035A JP H0481035 A JPH0481035 A JP H0481035A JP 19238390 A JP19238390 A JP 19238390A JP 19238390 A JP19238390 A JP 19238390A JP H0481035 A JPH0481035 A JP H0481035A
- Authority
- JP
- Japan
- Prior art keywords
- polarity
- circuit
- signal
- video signal
- pilot
- 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
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 230000010355 oscillation Effects 0.000 claims abstract description 5
- 230000005540 biological transmission Effects 0.000 claims description 10
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はＴＶ伝送送受信装置に間し、特にマイクロ波を
使用して伝送する場合に、第三者の傍受を防止できるＴ
Ｖ伝送送受信装置に間する。[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a TV transmission transmitting/receiving device that can prevent interception by a third party, especially when transmitting using microwaves.
V transmission transmitter/receiver.
従来のＴＶ伝送送受信装置は第２図（ａ＞の送信部の第
２図（ｂ）の受信部のように構成されている。送信部は
、音声入力端子１４．１５から入力された第１音声及び
第２音声は、音声変調回路１６．１７で音声サブキャリ
アを変調し、合成回路１１で入力端子１０から入力され
たビデオ信号と合成される。合成された信号は変調回路
１２で中間周波数信号に変調されて送信高周波回路１３
でマイクロ波に周波数変換され出力端子１８から出力さ
れる。受信部は入力端子２１から入力される送信部から
のマイクロ波受信入力信号を受信高周波回路２６で中間
周波に周波数変換され、復調回路２７で復調される。復
調された信号は、分波回路２８でビデオ信号と第１音声
サブキヤリヤ及び第２音声サブキヤリヤとに分波される
。ビデオ信号は出力端子２２に出力され、第１音声サブ
キヤリヤ及び第２音声サブキヤリヤはそれぞれ音声復調
回路３３．３４て′復調されて音声端子２４２５から音
声か出力される。A conventional TV transmission transmitting/receiving device is constructed as shown in the transmitting section in FIG. 2(a) and the receiving section in FIG. 2(b). The audio and second audio modulate the audio subcarriers in audio modulation circuits 16 and 17, and are combined with the video signal input from the input terminal 10 in the synthesis circuit 11.The synthesized signal is converted to an intermediate frequency in the modulation circuit 12. High frequency circuit 13 modulated by the signal and transmitted
The frequency of the microwave is converted into a microwave and outputted from the output terminal 18. In the receiving section, a microwave reception input signal from the transmitting section inputted from an input terminal 21 is frequency-converted into an intermediate frequency by a receiving high frequency circuit 26, and demodulated by a demodulating circuit 27. The demodulated signal is demultiplexed into a video signal, a first audio subcarrier, and a second audio subcarrier by a demultiplexing circuit 28. The video signal is output to the output terminal 22, and the first audio subcarrier and the second audio subcarrier are demodulated by the audio demodulation circuits 33 and 34, respectively, and the audio is output from the audio terminal 2425.
１発明か解決しようとする課題゛
上述した従来のＴ Ｖ伝送送受信装置は、マイクロ波に
より空間を伝搬しているので、第三者か受信を試みた場
合には、受信する事かできる。特にＰｍ通信信号を採用
していない限り無線は無防備で夕）す、前述のようｆ、
−Ｔ Ｖ伝送送受信装置では簡単に傍受されてしまうと
いう欠点がある。秘匿性を高めるためには入力端子１か
ら入力されるビデオ信号自体に対策かなされている必要
があるか、送受信装置の入力および出力に高価な秘匿装
置を備えなければならない欠点かある。1. Problems to be Solved by the Invention: Since the above-mentioned conventional TV transmission transmitter/receiver uses microwaves to propagate in space, if a third party attempts to receive the signals, they can receive the signals. In particular, unless a Pm communication signal is adopted, radio is vulnerable to radio waves.
-TV transmission transmitter/receiver equipment has the disadvantage that it can be easily intercepted. In order to improve the confidentiality, it is necessary to take measures against the video signal itself inputted from the input terminal 1, or the input and output of the transmitter/receiver must be provided with expensive concealment devices.
本発明のＴＶ伝送送受信装置は送信部にビデオ信号の同
期信号を検出ず同期信号検出回路と、この同期イス号検
出回路の制御信号によりビデオ信号の極性を反転させる
極性切替回路と、前記制御信号をもとに極性反転情報を
有する信号を変調する回線監視用パイロット発振回路と
を有し、受信部に前記極性反転情報を有する信号を検出
する回線監視用パイロット検出回路と、この検出された
信号により極性を反転してもとに戻す極性切替回路とを
有する。The TV transmission transmitter/receiver of the present invention includes a transmitting section that does not detect a synchronizing signal of a video signal and includes a synchronizing signal detecting circuit, a polarity switching circuit that inverts the polarity of the video signal according to a control signal of the synchronizing chair number detecting circuit, and the control signal a line monitoring pilot oscillation circuit that modulates a signal having polarity reversal information based on the polarity reversal information, a line monitoring pilot detection circuit that detects the signal having the polarity reversal information in a receiving section, and the detected signal. and a polarity switching circuit that inverts the polarity and returns it to the original.
次に、本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.
第１図（ａ）、（ｂ）は本発明の一実施例を示すそれぞ
れ送信部および受信部のブロック図であり、第２図と同
一符号の回路は同じ構成と動作を行う。すなわち、本実
施例では入力したビデオ信号は、同期信号検出回路１で
ビデオ信号の同期信号が検出され、制御回路２を介して
極性切替回路３で任意の時間にビデオ信号の極性が反転
される。通常はＴＶ画像に影響を与えないように、ＴＶ
画面の範囲外のタイミングで極性を反転させるため同期
信号検出回路１が必要となっている。ビデオ信号の極性
を反転させると同時にパイロット発振回路４を変調し、
極性反転した旨の情報を受信部に伝送する。受信部では
パイロット検出回路５てビデオ信号の極性を判定し、制
御回路６を介して極性切替回路７てビデオ信号の極性を
もとに戻すことかてきる。FIGS. 1(a) and 1(b) are block diagrams of a transmitting section and a receiving section, respectively, showing one embodiment of the present invention, and circuits with the same reference numerals as in FIG. 2 have the same configuration and operation. That is, in this embodiment, the synchronization signal of the input video signal is detected by the synchronization signal detection circuit 1, and the polarity of the video signal is inverted at an arbitrary time by the polarity switching circuit 3 via the control circuit 2. . Normally, the TV
A synchronization signal detection circuit 1 is required to invert the polarity at a timing outside the screen range. Modulating the pilot oscillation circuit 4 at the same time as inverting the polarity of the video signal,
Information indicating that the polarity has been reversed is transmitted to the receiving section. In the receiving section, a pilot detection circuit 5 determines the polarity of the video signal, and a control circuit 6 causes a polarity switching circuit 7 to return the polarity of the video signal to its original state.
以上説明したように本発明は、送信部において任意の時
間にビデオ信号の極性を反転させる回路と、極性反転情
報を変調するパイロット変調回路とを備えて、送信波の
秘匿性を持たせることかできる、また、受信部では極性
をもとに戻す回路と、この反転に必要な情報をパイロッ
ト信号検出回路から取り出すことできる。したがって、
簡単な回路を追加することにより、安価で秘匿性のある
ＴＶ伝送送受信装置を構成できる効果がある。As explained above, the present invention provides a transmitter with a circuit that inverts the polarity of a video signal at an arbitrary time and a pilot modulation circuit that modulates the polarity inversion information, thereby ensuring confidentiality of transmitted waves. In addition, in the receiving section, a circuit for returning the polarity to its original state and information necessary for this reversal can be extracted from the pilot signal detection circuit. therefore,
By adding a simple circuit, an inexpensive and secure TV transmission/reception device can be constructed.
第１図（ａ）、（ｂ）は本発明の一実施例を示すブロッ
ク図、第２図（ａ＞、（ｂ）は従来のＴＶ伝送送受信装
置のブロック図である。
１・・・同期信号検出回路、２，６・・・制御回路、３
・・・極性反転回路、４・・・パイロット発振回路（変
調器付き）、５・・・パイロット検出回路、７・・極性
切替回路、１０・・・（ビデオ信号）入力端子、１１・
・合成回路、１２・・変調回路、１３・・送信高周波回
路、１４．１５・・・音声入力端子、１６．１７・・・
音声変調回路、１８・・出力端子、２１・・入力端子、
２２・・・（ビデオ信号）出力端子、２３・・・アラー
ム出力端子、２４．２５・・・音声出力端子、２６・・
受信高周波回路、２７・・復調回路、２８・・・分波回
路、２９．３０・・・音声復調回路。FIGS. 1(a) and (b) are block diagrams showing an embodiment of the present invention, and FIGS. 2(a) and (b) are block diagrams of a conventional TV transmission transmitter/receiver. 1...Synchronization Signal detection circuit, 2, 6... control circuit, 3
... Polarity inversion circuit, 4... Pilot oscillation circuit (with modulator), 5... Pilot detection circuit, 7... Polarity switching circuit, 10... (video signal) input terminal, 11...
- Synthesis circuit, 12... Modulation circuit, 13... Transmission high frequency circuit, 14.15... Audio input terminal, 16.17...
Audio modulation circuit, 18...output terminal, 21...input terminal,
22...(video signal) output terminal, 23...alarm output terminal, 24.25...audio output terminal, 26...
Receiving high frequency circuit, 27... Demodulation circuit, 28... Branching circuit, 29.30... Audio demodulation circuit.
Claims (1)
回路と、この同期信号検出回路の制御信号によりビデオ
信号の極性を反転させる極性切替回路と、前記制御信号
をもとに極性反転情報を有する信号を変調する回線監視
用パイロット発振回路とを有し、受信部に前記極性反転
情報を有する信号を検出する回線監視用パイロット検出
回路と、この検出された信号により極性を反転してもと
に戻す極性切替回路とを有することを特徴とするＴＶ伝
送送受信装置。The transmitter includes a sync signal detection circuit that detects a sync signal of the video signal, a polarity switching circuit that inverts the polarity of the video signal based on a control signal of the sync signal detection circuit, and has polarity inversion information based on the control signal. a pilot oscillation circuit for line monitoring that modulates the signal; a pilot detection circuit for line monitoring that detects a signal having the polarity inversion information in the receiving section; A TV transmission transmitting/receiving device comprising a polarity switching circuit for returning the polarity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19238390A JPH0481035A (en) | 1990-07-20 | 1990-07-20 | Tv transmitter/receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19238390A JPH0481035A (en) | 1990-07-20 | 1990-07-20 | Tv transmitter/receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0481035A true JPH0481035A (en) | 1992-03-13 |
Family
ID=16290385
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19238390A Pending JPH0481035A (en) | 1990-07-20 | 1990-07-20 | Tv transmitter/receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0481035A (en) |
-
1990
- 1990-07-20 JP JP19238390A patent/JPH0481035A/en active Pending
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