JPS5810974A - Wireless transmitter for video camera output - Google Patents

Wireless transmitter for video camera output

Info

Publication number
JPS5810974A
JPS5810974A JP56108296A JP10829681A JPS5810974A JP S5810974 A JPS5810974 A JP S5810974A JP 56108296 A JP56108296 A JP 56108296A JP 10829681 A JP10829681 A JP 10829681A JP S5810974 A JPS5810974 A JP S5810974A
Authority
JP
Japan
Prior art keywords
signal
circuit
level
video
video camera
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
Application number
JP56108296A
Other languages
Japanese (ja)
Inventor
Yoshinori Okada
義憲 岡田
Isao Fukushima
福島 勇夫
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP56108296A priority Critical patent/JPS5810974A/en
Publication of JPS5810974A publication Critical patent/JPS5810974A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/76Television signal recording
    • H04N5/765Interface circuits between an apparatus for recording and another apparatus
    • H04N5/77Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television camera

Landscapes

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

Abstract

PURPOSE:To record only an excellent picture and an audio signal on a VTR stably, by detecting a level of a synchronizing signal at a reception side and controlling the operating mode of the VTR. CONSTITUTION:An antenna 6 receives a modulation wave from a video camera and a demodulation circuit 7 demodulates the signal into an original camera video output. This video output is separated into a video signal (a), an audio signal (g) and a remote control signal (e) at a signal separation circuit 8 and a vertical synchronizing signal is detected at a vertical synchronizing signal detection circuit 9. The level of this synchronizing signal is compared at a comparison circuit 10, and only when the level exceeds a reference voltage 11, a comparison circuit output (c) is outputted. This signal is processed at a signal processing circuit 12 and a control signal (d) is outputted. When the signal (d) is outputted, the deterioration of reception state is informed at an informing circuit 14 and the recording of a VTR is stopped with an addition control signal (f).

Description

【発明の詳細な説明】 本発明は、映像、音声および■1動作制御信号等を微弱
な電波でワイヤレス伝送するビデオカメラ出力のワイヤ
レス伝送装置に関するものである。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a video camera output wireless transmission device that wirelessly transmits video, audio, operation control signals, etc. using weak radio waves.

従来ビデオカメラと磁気記録再生装置(以下■1と称す
)との間は、ケーブル等の有線で接続され、映像、音声
およびVTRの動作モードを制御する■1動作制御信号
は、ビデオカメラから■1に有線で伝送されていた。そ
してビデオカメラ側で記録動作を制御しながら、■1に
映像信号および音声信号が記録されていた。
Conventionally, a video camera and a magnetic recording/reproducing device (hereinafter referred to as ``1'') are connected by wires such as cables, and ``1 operation control signals'' that control video, audio, and VTR operation modes are sent from the video camera. 1 was transmitted by wire. Then, while controlling the recording operation on the video camera side, the video signal and audio signal were recorded in (1).

しかし、このような従来装置では、ビデオカメラと■1
との間の太いケーブルのため、使用時にビデオカメラ側
の自由度が抱束され、ビデオカメラが使い難いという欠
点がありた。
However, with such conventional devices, the video camera and ■1
Because of the thick cable between the camcorder and the camcorder, the flexibility of the camcorder during use is restricted, making it difficult to use the camcorder.

このような欠点を解消する手段として、電波法の対象外
の微弱な電波を用いて、所望の信号をワイヤレスで伝送
する方式が提案されている。
As a means to overcome these drawbacks, a method has been proposed in which a desired signal is transmitted wirelessly using weak radio waves that are not subject to the Radio Law.

第1図にこの方式の一例を示す。図において、ビデオカ
メラ1から出力された映像、音声および■1動作制御信
号等の被伝送信号は送信機3より微弱な電波5として発
射される。この電波5は受信機4で受信され、VTR2
に映倫および音声が記録されると共にVTRの動作を制
御する。
FIG. 1 shows an example of this method. In the figure, signals to be transmitted such as video, audio, and (1) operation control signals outputted from a video camera 1 are emitted as weak radio waves 5 from a transmitter 3. This radio wave 5 is received by the receiver 4, and the VTR 2
The video and audio are recorded and the operation of the VTR is controlled.

この方式においては、たとえばビデオカメラ1とVTR
2との間隔が離れる岬すると受信レベルが低下し、映像
および音声信号の受信性能が劣化するが、使用者はこの
劣化を認識することなく、良好でない画像、音声な■1
で記録してしまうという欠点があった。また■1は入力
された映像信号の垂直同期信号を基準クロックとして記
録しているため、■1で再生したとき再生画像に同期乱
れを生じるという欠点がありた。
In this method, for example, video camera 1 and VTR
If the distance between the two and
It had the disadvantage that it was recorded in Furthermore, since the method (1) records the vertical synchronization signal of the input video signal as a reference clock, there is a drawback that synchronization disturbance occurs in the reproduced image when the method (1) is reproduced.

しかも著しく受信レベルが低下すると、上記■1動作制
御信号の送受信が不安定になり、ビデオカメラ側でVT
Rを所望の動作に制御できず、・1 誤動作を生じるという欠点もありた。
Moreover, if the reception level drops significantly, the transmission and reception of the operation control signals in (1) above will become unstable, and the VT
There was also the drawback that R could not be controlled to the desired operation, resulting in 1 malfunction.

本発明は、上記した従来技術の欠点をなくし、使用者が
受信状態を監視しながらビデオカメラを何の束縛もなく
自由に使用でき、ビデオカメラ側から指示される■1動
作制御に応じて、曳好な画像、音声のみをVTRで安定
に記録できるワイヤレス伝送装置を提供することにある
The present invention eliminates the drawbacks of the prior art described above, allows the user to freely use the video camera without any restrictions while monitoring the reception status, and allows the user to: To provide a wireless transmission device capable of stably recording only good images and sounds on a VTR.

上記目的を達成するために、本発明は、受信側で得られ
た映像信号から同期信号を検出し、上記同期信号の検出
レベルによりて受信状態を判定し、その判定信号に応じ
て■1の動作毫−ドを制御するようにした点に%徴があ
る。
In order to achieve the above object, the present invention detects a synchronization signal from a video signal obtained on the receiving side, determines the reception state based on the detection level of the synchronization signal, and according to the determination signal (1). The key point is that the operating mode is controlled.

以下本発明を実施例を用いて説明する。第2図は本発明
による一実施例を示す受信機のブロック図である。図に
おいて、6は変調波を受信するアンテナ、7は上記変調
波を元のカメラビデオ出力に復調する復調回路、8は復
調されたビデオカメラ出力を映像信号a、音声信号g。
The present invention will be explained below using examples. FIG. 2 is a block diagram of a receiver showing one embodiment of the present invention. In the figure, 6 is an antenna that receives the modulated wave, 7 is a demodulation circuit that demodulates the modulated wave to the original camera video output, and 8 is the demodulated video camera output as a video signal a and an audio signal g.

遠隔制御信号・に分離する信号分離回路、9は上記映像
信号aから垂直同期信号すを検出する垂直同期信号検出
回路、10は上記垂直同期検出信号すと基準電圧源11
をレベル比較する比較回路、12は上記比較回路10の
出力cK4じた制御信号dを出力する信号処理回路、1
3は上記制御信号dと遠隔制御信号Cを加算する加算回
路、14は上記制御信号dに応じて作動する報知回路で
ある。
9 is a vertical synchronization signal detection circuit for detecting the vertical synchronization signal from the video signal a; 10 is the vertical synchronization detection signal and a reference voltage source 11;
12 is a signal processing circuit that outputs a control signal d equal to the output cK4 of the comparison circuit 10;
Reference numeral 3 represents an adder circuit for adding the control signal d and remote control signal C, and reference numeral 14 represents a notification circuit that operates in response to the control signal d.

次にに2図および第3図を用いて本実施例の動作を説明
する。第1図に示されている送信機3はビデオカメラ1
からの映倫、音声およびビデオカメラ側のポーズボタン
のオン・オフで発生する遠隔制御信号を被変調信号とし
て変調し、変調波を空間に放射している。アンテナ6は
この変調波を受信し、復調回路−7はこの変調波を元の
カメラビデオ出力に復調する。この復調されたカメラビ
デオ出力は信号分離回路8で映像信号a、音声信号g、
および遠隔制御信号・に分離される。信号分離回路8か
ら受信状態に応じて第3図(1)に示すような映像信号
が出力されると、上記垂直同期信号検出回路9によって
、第3図(b)に示すような映像信号1の垂直同期信号
に応じた検出信号が得られる。一方、受信状態が劣化し
たか否かを判定する電圧(以下、判定レベルという)2
2を基準電圧源11で予め設定しておけば、上記比較回
路10によって、受信状態が判定レベル22を越えたと
きだけ上記検出信号すに応じたパルスを有する比較回路
出力が、第3図(C)に示すように得られる。
Next, the operation of this embodiment will be explained using FIGS. 2 and 3. The transmitter 3 shown in FIG.
The remote control signal generated by turning on and off the video camera's pause button and the video camera's video camera is modulated as a modulated signal, and the modulated wave is radiated into space. Antenna 6 receives this modulated wave, and demodulation circuit 7 demodulates this modulated wave to the original camera video output. This demodulated camera video output is sent to a signal separation circuit 8 where it is divided into a video signal a, an audio signal g,
and remote control signal. When the signal separation circuit 8 outputs a video signal as shown in FIG. 3(1) in accordance with the reception state, the vertical synchronization signal detection circuit 9 outputs a video signal 1 as shown in FIG. 3(b). A detection signal corresponding to the vertical synchronization signal is obtained. On the other hand, voltage (hereinafter referred to as determination level) 2 for determining whether or not the reception condition has deteriorated
2 is set in advance by the reference voltage source 11, the comparator circuit 10 outputs a comparator circuit output having a pulse corresponding to the detection signal 2 only when the reception state exceeds the determination level 22 as shown in FIG. C) is obtained as shown in FIG.

比較回路出力Cが入力されると、上記信号処理回路12
は、比較回路出力Cの立上りをトリガとして垂直同期期
間より少し長い時間tだけ低レベルでその後高レベルに
なるパルス、すなわち、第3図(d)に示すような受信
状態に対応した制御信号を出力する。制御信号dが出力
された、場合には、報知回路14は制御信号dに応じて
作動し、使用者に受信状態の劣化を知らせることができ
る。
When the comparison circuit output C is input, the signal processing circuit 12
is a pulse that is triggered by the rising edge of the comparison circuit output C and is at a low level for a time t slightly longer than the vertical synchronization period and then becomes a high level, that is, a control signal corresponding to the reception state as shown in FIG. 3(d). Output. When the control signal d is output, the notification circuit 14 operates according to the control signal d, and can notify the user of the deterioration of the reception state.

一方、加算回路13に入力した制御信号dは上記遠隔制
御信号eと加算回路15で加算され、第5図(f)に示
すような加算制御信号が■1に入力され奏。ここで、加
算制御信号fが高レベルのとき、■1の記録が停止する
ようにしておくと、受信状態が劣化すると、VTRは自
動的に非記録動作となり、良好な画像および音声のみが
記録されることとなる。
On the other hand, the control signal d input to the adder circuit 13 is added to the remote control signal e in the adder circuit 15, and the addition control signal as shown in FIG. 5(f) is input to (1) and played. Here, if the recording in (1) is stopped when the addition control signal f is at a high level, if the reception condition deteriorates, the VTR will automatically enter non-recording mode and only good images and sound will be recorded. It will be done.

また帯域の広い映倫信号1が良好に受信されていれば、
狭帯域で伝送可能な遠隔制御信号eは、レベル不足によ
る乱れをおこすことなく、第3図(e)に示すように所
望の■1動作制御を誤動作なく行なうことができる。
Also, if Eirin Signal 1, which has a wide band, is received well,
The remote control signal e, which can be transmitted in a narrow band, does not cause disturbances due to insufficient level and can perform the desired 1 operation control without malfunction, as shown in FIG. 3(e).

本実施例によれば、受信した垂直同期信号が。According to this embodiment, the received vertical synchronization signal is:

正常なレベルのときだけ■1で記録されるため、入力さ
れた映像信号の垂直同期信号を基準に記録動作を行なっ
ているVTRは、再生時に同期乱れのない良好な画像を
得ることができる。
Since recording is performed at (1) only when the level is normal, a VTR that performs recording operations based on the vertical synchronization signal of the input video signal can obtain good images without synchronization disturbance during playback.

上記の実施例において、垂直同期検出信号が、第4図(
a) K示されているように、短時間に判定レベル22
近辺で変動した場合には、比較回路14の出力は同図(
b)のように不規則な信号になる。
In the above embodiment, the vertical synchronization detection signal is as shown in FIG.
a) Judgment level 22 in a short time as shown
If the fluctuation occurs in the vicinity, the output of the comparison circuit 14 will be as shown in the figure (
The signal will be irregular as shown in b).

1   このため、信号処理回路12からの出力は同図
(C)に示されているように、短時間に不規則な繰返し
を生ずる。
1. Therefore, the output from the signal processing circuit 12 produces irregular repetitions in a short period of time, as shown in FIG. 1(C).

このような第1実施例の不具合を改良したのが、本発明
の第2実施例であり、以下にこれを説明する。本発明の
第2実施例は、第1実施例の比較回路10および基準電
圧源11に代えて’7z建ツ))リガ回路とし、上記垂
直同期検出信号すによる劣化判定レベルを劣化開始時と
劣化解消時とで差をもたせたものである。すなわち、第
4図(b) K示されているように、劣化解消時の判定
レベル24を劣化開始時の判定レベル23より高いレベ
ルにすると、上記シ&ξットトリガ回路に同図(II)
に示されているような垂直同期検出信号が入力した場合
には、判定レベル23より低くナクタハルスatカラQ
定レベル24以上のパルスa!までの間、シ&建ットト
リガ回路出力は同図(d)に示されているようにローレ
ベルになる。
The second embodiment of the present invention is an improvement over the problems of the first embodiment, and will be explained below. The second embodiment of the present invention uses a '7z-based trigger circuit in place of the comparator circuit 10 and reference voltage source 11 of the first embodiment, and sets the deterioration judgment level by the vertical synchronization detection signal to the time at which deterioration starts. There is a difference between when the deterioration is resolved and when the deterioration is resolved. That is, as shown in FIG. 4(b), if the determination level 24 at the time of resolution of deterioration is set to a higher level than the determination level 23 at the time of deterioration start, the above-mentioned shut &
When a vertical synchronization detection signal as shown in is input, the judgment level is lower than 23 and Naktahals at Kara Q
Pulse a with constant level 24 or higher! Until then, the output of the digital trigger circuit is at a low level as shown in FIG. 4(d).

このため、信号処理回路12から得られる制御信号は同
図(e)のように短時間に繰り返しのない安定したもの
になる。
Therefore, the control signal obtained from the signal processing circuit 12 becomes stable without repeating in a short period of time as shown in FIG. 2(e).

このように、第2実施例によれば、受信状態が判定レベ
ル近傍で変動するような場合に、安定した制御信号を得
ることができる。
In this manner, according to the second embodiment, a stable control signal can be obtained even when the reception state fluctuates around the determination level.

なお、前記の第1.第2実施例においては映偉信号麿の
垂直同期信号のレベルで受信状態を判別したが、映倫信
号の水平同期信号のレベルで受信状態を判別してもよい
ことは勿論であ本この場合、第2図の垂直同期信号検出
回路9を水平同期信号検出回路に置き換えることが必要
である。
Note that the above 1. In the second embodiment, the receiving state was determined based on the level of the vertical synchronizing signal of the Eirin signal, but it is of course possible to determine the receiving state based on the level of the horizontal synchronizing signal of the Eirin signal. It is necessary to replace the vertical synchronization signal detection circuit 9 in FIG. 2 with a horizontal synchronization signal detection circuit.

以上説明したように、本発明によれば、ビデオカメラと
VTRとの間にケーブルがないのでビデオカメラが使い
易いという効果がある。また、ワイヤレスであるにもか
かわらず、良好な画像および音声信号をVTRで記録再
生することができるという効果がある。
As described above, according to the present invention, there is an effect that the video camera is easy to use because there is no cable between the video camera and the VTR. Another advantage is that good image and audio signals can be recorded and played back on a VTR even though it is wireless.

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

第1図は従来のビデオカメラ出力のワイヤレス伝送装置
の概略図、第2図は本発明の第1実施例のブロック図、
第3図は前記第1実施例の要部の信号波形図、第4図は
本発明の第2実施例の要部の信号波形図を示す。 7・・・復調回路    8・・・信号分離回路9・・
・垂直同期信号分離回路 10・・・比較回路    12・・・信号処理回路1
3・・・加算回路    14・・・報知回路才z図 6 オ3図
FIG. 1 is a schematic diagram of a conventional video camera output wireless transmission device, and FIG. 2 is a block diagram of a first embodiment of the present invention.
FIG. 3 shows a signal waveform diagram of the main part of the first embodiment, and FIG. 4 shows a signal waveform diagram of the main part of the second embodiment of the present invention. 7... Demodulation circuit 8... Signal separation circuit 9...
・Vertical synchronization signal separation circuit 10...Comparison circuit 12...Signal processing circuit 1
3... Addition circuit 14... Notification circuit Figure 6 Figure 3

Claims (2)

【特許請求の範囲】[Claims] (1)ビデオカメラから磁気記録再生装置に映像信号、
音声信号および遠隔制御信号をワイヤレスで伝送する装
置において、受信機で受信された映像信号の同期信号を
検出する同期信号検出回路、該同期信号検出回路で検出
された同jI1号のレベルが所定のレベルより上にある
か否かを判定する回路を具備し、前記同期信号のレベル
が前記所定のレベル以下になったときに、前記磁気記録
再生装置において記録動作が行なわれないようにしたこ
とを特徴とするビデオカメラ出力のワイヤレス伝送装置
(1) Video signal from the video camera to the magnetic recording and reproducing device,
In a device that wirelessly transmits an audio signal and a remote control signal, a sync signal detection circuit detects a sync signal of a video signal received by a receiver, and the level of jI1 detected by the sync signal detection circuit is set to a predetermined level. a circuit for determining whether the level of the synchronizing signal is above the predetermined level, and the recording operation is not performed in the magnetic recording/reproducing device when the level of the synchronizing signal becomes below the predetermined level. A wireless transmission device for video camera output.
(2)前記映像信号の同期信号か[lI[同期信号であ
ることをI¥1黴とする前記特許−求p範s嬉1項記載
のビデオカメラ出力のワイヤレス伝送装置。
(2) The wireless transmission device for outputting a video camera according to Paragraph 1 of the patent, wherein the synchronization signal of the video signal is a synchronization signal.
JP56108296A 1981-07-13 1981-07-13 Wireless transmitter for video camera output Pending JPS5810974A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56108296A JPS5810974A (en) 1981-07-13 1981-07-13 Wireless transmitter for video camera output

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56108296A JPS5810974A (en) 1981-07-13 1981-07-13 Wireless transmitter for video camera output

Publications (1)

Publication Number Publication Date
JPS5810974A true JPS5810974A (en) 1983-01-21

Family

ID=14481082

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56108296A Pending JPS5810974A (en) 1981-07-13 1981-07-13 Wireless transmitter for video camera output

Country Status (1)

Country Link
JP (1) JPS5810974A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60193755U (en) * 1984-06-01 1985-12-23 松岡産業株式会社 wireless video camera equipment
US4758154A (en) * 1985-07-15 1988-07-19 Le Four Industriel Belge Fluidized-bed plant
US6545709B2 (en) * 1996-09-02 2003-04-08 Canon Kabushiki Kaisha Wireless receiving apparatus and method therefor
US6961238B2 (en) 2002-06-07 2005-11-01 Kabushiki Kaisha Toshiba Electronic device
EP1919208A2 (en) * 2006-11-06 2008-05-07 Samsung Electronics Co., Ltd. Photographing device for controlling image recording according to the state of a received image signal on image recording and an image recording method thereof

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60193755U (en) * 1984-06-01 1985-12-23 松岡産業株式会社 wireless video camera equipment
US4758154A (en) * 1985-07-15 1988-07-19 Le Four Industriel Belge Fluidized-bed plant
US6545709B2 (en) * 1996-09-02 2003-04-08 Canon Kabushiki Kaisha Wireless receiving apparatus and method therefor
US6961238B2 (en) 2002-06-07 2005-11-01 Kabushiki Kaisha Toshiba Electronic device
EP1919208A2 (en) * 2006-11-06 2008-05-07 Samsung Electronics Co., Ltd. Photographing device for controlling image recording according to the state of a received image signal on image recording and an image recording method thereof
EP1919208A3 (en) * 2006-11-06 2012-03-14 Samsung Electronics Co., Ltd. Photographing device for controlling image recording according to the state of a received image signal during image recording and an image recording method thereof

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