JPS63245194A - Cctv device - Google Patents

Cctv device

Info

Publication number
JPS63245194A
JPS63245194A JP7926987A JP7926987A JPS63245194A JP S63245194 A JPS63245194 A JP S63245194A JP 7926987 A JP7926987 A JP 7926987A JP 7926987 A JP7926987 A JP 7926987A JP S63245194 A JPS63245194 A JP S63245194A
Authority
JP
Japan
Prior art keywords
signal
color
color burst
video signal
audio signal
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
JP7926987A
Other languages
Japanese (ja)
Other versions
JPH0420556B2 (en
Inventor
Setsu Komuro
小室 節
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.)
Fujitsu General Ltd
Original Assignee
Fujitsu General 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 Fujitsu General Ltd filed Critical Fujitsu General Ltd
Priority to JP7926987A priority Critical patent/JPS63245194A/en
Publication of JPS63245194A publication Critical patent/JPS63245194A/en
Publication of JPH0420556B2 publication Critical patent/JPH0420556B2/ja
Granted legal-status Critical Current

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  • Television Systems (AREA)
  • Closed-Circuit Television Systems (AREA)
  • Color Television Systems (AREA)

Abstract

PURPOSE:To superimpose a sound signal on a video signal without widening a transmitting frequency band to multiplex and transmit by providing an encoder for AM modulating a color burst signal in the video signal by the sound signal to form a multiplex signal in a transmitting side. CONSTITUTION:In the transmitting side 1, the process circuit 8 of a CCTV color camera 4 scans an object to output a color synthesized video signal obtained by adding a synchronizing signal such as the color burst signal (3.58 MHz) or horizontal.vertical synchronizing signals (fh, fv). The encoder 9 transmits the multiplex signal obtained by AM modulating the color burst signal in the color synthesized video signal outputted from the process circuit 8 by the sound signal from an LPF 7 through a transmission cable 3 to a receiving side 2. At the time of applying this AM modulation, since the frequency band of the sound signal outputted from the LPF 7 is below fh/2(=7.5 KHz), the sound signal is sampled by the frequency fh above twice as high as the sound signal and is mounted on the color burst signal to have no reflected distortion.

Description

【発明の詳細な説明】 [産業上の利用分野] 本発明は、閉回路テレビジョン装置(以下単にCCTV
装置と記す)に関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to closed circuit television equipment (hereinafter simply CCTV).
(hereinafter referred to as "device").

[従来の技術] CCTV装置には、映像信号に音声信号を重畳した多重
信号を送信側から受信側へ有線(例えば同軸ケーブル)
または無線で伝送するようにしたものがある。従来、こ
のようなCCTv装置においては、映像信号の伝送周波
数帯域外に音声信号を重畳していた。
[Prior art] CCTV equipment uses a wire (for example, a coaxial cable) to transmit a multiplexed signal in which an audio signal is superimposed on a video signal from the transmitting side to the receiving side.
Or there are those that are transmitted wirelessly. Conventionally, in such a CCTv device, an audio signal has been superimposed outside the transmission frequency band of the video signal.

[発明が解決しようとする問題点] このため、伝送周波数帯域が広くなるという問題点があ
った。
[Problems to be Solved by the Invention] Therefore, there was a problem that the transmission frequency band became wider.

本発明は上述の問題点に鑑みなされたもので、伝送周波
数帯域を広げることなく、映像信号に音声信号を重畳し
て多重伝送することのできるCCTV装置を得ることを
目的とするものである。
The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to obtain a CCTV device that can multiplex transmit and superimpose an audio signal on a video signal without widening the transmission frequency band.

[問題点を解決するための手段] 本発明は、映像信号に音声信号を重畳した多重信号を送
信側から受信側へ伝送するようにしたCCTV装置にお
いて、前記送信側は、映像信号中のカラーバースト信号
を音声信号でAM変調して多重信号を形成するエンコー
ダを具備してなることを特徴とするものである。
[Means for Solving the Problems] The present invention provides a CCTV device that transmits a multiplexed signal in which an audio signal is superimposed on a video signal from a transmitting side to a receiving side. The apparatus is characterized in that it includes an encoder that performs AM modulation on a burst signal with an audio signal to form a multiplexed signal.

[作用] 映像信号の伝送周波数帯域内にあるカラーバースト信号
を音声信号でAM変調(振幅変調)して、映像信号に音
声信号を重畳した多重信号を形成し、これを送信側から
受信側へ伝送する。
[Operation] A color burst signal within the transmission frequency band of the video signal is AM-modulated (amplitude modulated) with an audio signal to form a multiplexed signal in which the audio signal is superimposed on the video signal, and this is transmitted from the transmitting side to the receiving side. Transmit.

[実施例コ 図は本発明の一実施例を示すもので、(1)は送信側、
(2)は受信側、(3)は伝送ケーブルである。
[Example Figure 1 shows an example of the present invention, (1) shows the transmitting side,
(2) is the receiving side, and (3) is the transmission cable.

前記送信側(1)には、CCTVカラーカメラ(4)と
、音声信号入力用のマイクロホン(5)と、このマイク
ロホン(5)の出力側に接続されたアンプ(増幅器)(
6)と、このアンプ(6)の出力側に接続されたLPF
(ローパスフィルタ)(7)とが設けられている。
The transmission side (1) includes a CCTV color camera (4), a microphone (5) for audio signal input, and an amplifier (amplifier) connected to the output side of the microphone (5).
6) and the LPF connected to the output side of this amplifier (6).
(Low pass filter) (7) is provided.

このL P F (7)は+kuhは水平同期周波数)
以下の周波数帯域の信号を通過せしめるように構成され
ている。
This L P F (7) +kuh is the horizontal synchronization frequency)
It is configured to pass signals in the following frequency bands.

前記CGTVカラーカメラ(4)は、被写体を走査して
カラー合成映像信号を出力するプロセス回路(8)と、
このプロセス回路(8)から出力するカラー合成映像信
号中のカラーバースト信号を前記LP F (7)から
出力する音声信号でAM変調して多重信号を出力するエ
ンコーダ(9)とからなっている。
The CGTV color camera (4) includes a process circuit (8) that scans a subject and outputs a color composite video signal;
It consists of an encoder (9) that modulates the color burst signal in the color composite video signal output from the process circuit (8) with the audio signal output from the LPF (7) and outputs a multiplexed signal.

前記受信側(2)には、受信信号を増幅するアンプ(1
0)と、このアンプ(10)の出力信号の中から音声信
号でAM変調されたカラーバースト信号を抜き取るバー
スト抜取回路(11)と、このバースト抜取回路(11
)の出力側に順次接続された検波回路(12)とL P
 F (13)と、このL P F (13)の出方に
基づいて前記バースト抜取回路(11)の出方するカラ
ーバースト信号の振幅レベルを所定のレベル(例えばピ
ークピーク電圧Vp−ρが0.3V)に制御して出方す
るAGC(自動利得制御)アンプ(14)と、とのAG
Cアンプ(14)の出力するカラーバースト信号を前記
アンプ(10)の出力信号に付加して、カラー合成映像
信号を出力するバースト付加回路(15)と。
The receiving side (2) includes an amplifier (1) that amplifies the received signal.
0), a burst extraction circuit (11) that extracts a color burst signal AM-modulated with an audio signal from the output signal of this amplifier (10), and this burst extraction circuit (11).
) and the detection circuit (12) connected sequentially to the output side of L P
F (13) and the amplitude level of the color burst signal output from the burst extraction circuit (11) based on the output of L P F (13) to a predetermined level (for example, when the peak-to-peak voltage Vp-ρ is 0). An AGC (automatic gain control) amplifier (14) that controls the output voltage to .3V) and
a burst addition circuit (15) that adds the color burst signal output from the C amplifier (14) to the output signal of the amplifier (10) and outputs a color composite video signal;

前記L P F (13)の出力信号に基づいて、カラ
ーバースト信号のない垂直同期信号(例えば60Hz)
の期間(音声信号が途切れる期間に相当)の音声の途切
れを補正して音声信号を出力する音声補正回路(16)
とが設けられている。前記L P F (13)はに以
下の周波数帯域の信号を通過せしめるように構成されて
いる。
Based on the output signal of the L P F (13), a vertical synchronization signal (for example, 60 Hz) without a color burst signal
an audio correction circuit (16) that corrects audio interruptions during the period (corresponding to the audio signal interruption period) and outputs an audio signal;
is provided. The L P F (13) is configured to pass signals in the following frequency bands.

つぎに前記実施例の作用について説明する。Next, the operation of the above embodiment will be explained.

(イ)送信側(1)においては、CCTVカラーカメラ
(4)のプロセス回路(8)は、被写体を走査して得た
カラー映像信号にカラーバースト信号(3,58MHz
)や水平、垂直同期信号(fh、fv)などの同期信号
を付加したカラー合成映像信号を出力する。エンコ−タ
(9)は、プロセス回路(8)から出力するカラー合成
映像信号中のカラーバースト信号をL P F (7)
からの音声信号でAM変調した多重信号を伝送ケーブル
(3)を介して受信側(2)へ伝送する。この人M変調
時において、L P F (7)から出力する音声信号
の周波数帯域はlf!−(・7.5KHz)以下となっ
ているので、音声信号は音声信号の2倍以上の周波数f
hでサンプリングされてカラーバースト信号に乗り折り
返し歪が起きない。
(b) On the transmitting side (1), the process circuit (8) of the CCTV color camera (4) adds a color burst signal (3.58MHz) to the color video signal obtained by scanning the subject.
), and horizontal and vertical synchronization signals (fh, fv). The encoder (9) converts the color burst signal in the color composite video signal output from the process circuit (8) into LPF (7).
A multiplexed signal AM-modulated with the audio signal from the receiver is transmitted to the receiving side (2) via the transmission cable (3). During this human M modulation, the frequency band of the audio signal output from L P F (7) is lf! -(・7.5KHz) or less, the audio signal has a frequency f that is more than twice that of the audio signal.
It is sampled at h and rides on the color burst signal, so no aliasing distortion occurs.

(ロ)受信側(2)では、バースト抜取口路(11)は
(b) On the receiving side (2), the burst extraction port path (11).

受信信号の中から音声信号でAM変調されたカラーバー
スト信号を抜き取り、このカラーバースト信号に重畳し
ている音声信号が検波回路(12)およびL P F 
(13)で検出され、この検出信号がAGC電圧として
AGCアンプ(14)へ出方する。
A color burst signal AM-modulated with an audio signal is extracted from the received signal, and the audio signal superimposed on this color burst signal is sent to the detection circuit (12) and the LPF.
(13), and this detection signal is output to the AGC amplifier (14) as an AGC voltage.

例えば、音声信号をfa、カラーバースト信号をfbと
するとAM変調されたカラーバースト信号はfa−fb
で表わされる。AGCアンプ(14)の増幅率をAgと
すると、fa−fb−Ag=fbであるから、Ag=1
となり、AGCアンプ(14)の増幅率の変化が音声信
号となる。このため、AGCアンプ(14)の増幅率の
変化がリニア(線形)であれば、Ag=kCv(kは定
数、CvはAGC電圧)となり、AGC電圧そのものが
音声信号となる。
For example, if the audio signal is fa and the color burst signal is fb, the AM modulated color burst signal is fa-fb.
It is expressed as If the amplification factor of the AGC amplifier (14) is Ag, then fa-fb-Ag=fb, so Ag=1
Therefore, the change in the amplification factor of the AGC amplifier (14) becomes the audio signal. Therefore, if the change in the amplification factor of the AGC amplifier (14) is linear, Ag=kCv (k is a constant, Cv is the AGC voltage), and the AGC voltage itself becomes the audio signal.

したがって、AGCアンプ(14)は、AGO電圧に基
づいてバースト抜取回路(11)がら出力するカラーバ
ースト信号の振幅を所定レベル(例えばVP−p=0.
3■)に制御してバースト付加回路(15)に出方し、
このバースト付加回路(15)からはカラー合成映像信
号が出力する。また、LPF(13)がら出力している
音声信号は、音声補正回路(16)で補正され、音声信
号として出方する。すなわち、音声信号は水平同期信号
のバックポーチに挿入されたカラーバースト信号に重畳
されているので、垂直同期信号のときには音声信号が途
切れる。音声補正回路(16)はこのような音声信号の
途切れを補正するもので、例えばCR回路を主体として
、途切れる期間における音は、その直前の音のエコーと
なるように補正する。
Therefore, the AGC amplifier (14) adjusts the amplitude of the color burst signal output from the burst sampling circuit (11) to a predetermined level (for example, VP-p=0.
3■) and output to the burst addition circuit (15),
A color composite video signal is output from this burst adding circuit (15). Further, the audio signal output from the LPF (13) is corrected by the audio correction circuit (16) and output as an audio signal. That is, since the audio signal is superimposed on the color burst signal inserted into the back porch of the horizontal synchronization signal, the audio signal is interrupted when it is a vertical synchronization signal. The audio correction circuit (16) corrects such interruptions in the audio signal, and uses, for example, a CR circuit as its main component, and corrects the sound during the period of interruption so that it becomes an echo of the sound immediately before the interruption.

[発明の効果] 本発明によるCGTV装置は、上記のように、送信側が
映像信号中のカラーバースト信号を音声信号でAM変調
して多重信号を形成するエンコーダを具備しているので
、伝送周波数帯域を広げることなく映像信号に音声信号
を重畳して多重伝送することができる。
[Effects of the Invention] As described above, the CGTV device according to the present invention is equipped with an encoder on the transmitting side that AM-modulates a color burst signal in a video signal with an audio signal to form a multiplexed signal. It is possible to multiplex transmission by superimposing an audio signal on a video signal without spreading the signal.

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

図は本発明によるCGTV装置の一実施例を示すブロッ
ク図である。 (1)・・・送信側、(2)・・・受信側、(3)・・
・伝送ケーブル、(4)−CGTVカラーカメラ、(7
) (13)−L P F、(9)・・・エンコーダ、
(11)・・・バースト抜取回路、(12)・・・検波
回路、(14)・・・AGCアンプ、(15)・・・バ
ースト付加回路、(16)・・・音声補正回路。
The figure is a block diagram showing an embodiment of a CGTV device according to the present invention. (1)...Sending side, (2)...Receiving side, (3)...
・Transmission cable, (4) - CGTV color camera, (7
) (13)-LPF, (9)...encoder,
(11) Burst extraction circuit, (12) Detection circuit, (14) AGC amplifier, (15) Burst addition circuit, (16) Audio correction circuit.

Claims (1)

【特許請求の範囲】[Claims] (1)映像信号に音声信号を重畳した多重信号を送信側
から受信側へ伝送するようにしたCCTV装置において
、前記送信側は、映像信号中のカラーバースト信号を音
声信号でAM変調して多重信号を形成するエンコーダを
具備してなることを特徴とするCCTV装置。
(1) In a CCTV device that transmits a multiplexed signal in which an audio signal is superimposed on a video signal from a transmitting side to a receiving side, the transmitting side performs AM modulation on a color burst signal in the video signal with an audio signal and multiplexes the signal. A CCTV device comprising an encoder that forms a signal.
JP7926987A 1987-03-31 1987-03-31 Cctv device Granted JPS63245194A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7926987A JPS63245194A (en) 1987-03-31 1987-03-31 Cctv device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7926987A JPS63245194A (en) 1987-03-31 1987-03-31 Cctv device

Publications (2)

Publication Number Publication Date
JPS63245194A true JPS63245194A (en) 1988-10-12
JPH0420556B2 JPH0420556B2 (en) 1992-04-03

Family

ID=13685144

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7926987A Granted JPS63245194A (en) 1987-03-31 1987-03-31 Cctv device

Country Status (1)

Country Link
JP (1) JPS63245194A (en)

Also Published As

Publication number Publication date
JPH0420556B2 (en) 1992-04-03

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