JPH01241275A - Digital video camera - Google Patents

Digital video camera

Info

Publication number
JPH01241275A
JPH01241275A JP63068974A JP6897488A JPH01241275A JP H01241275 A JPH01241275 A JP H01241275A JP 63068974 A JP63068974 A JP 63068974A JP 6897488 A JP6897488 A JP 6897488A JP H01241275 A JPH01241275 A JP H01241275A
Authority
JP
Japan
Prior art keywords
converter
output
signal
input
selector
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
JP63068974A
Other languages
Japanese (ja)
Other versions
JPH0738695B2 (en
Inventor
Shinichi Yoshikawa
伸一 吉川
Kazuhiro Kishimoto
岸本　和広
Akira Yada
矢田　朗
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.)
Sharp Corp
Original Assignee
Sharp Corp
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 Sharp Corp filed Critical Sharp Corp
Priority to JP63068974A priority Critical patent/JPH0738695B2/en
Publication of JPH01241275A publication Critical patent/JPH01241275A/en
Publication of JPH0738695B2 publication Critical patent/JPH0738695B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Color Television Systems (AREA)
  • Color Television Image Signal Generators (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)

Abstract

PURPOSE:To execute the phase adjustment of a clock of an AD converter more accurately and simply by providing a mode connecting an AD converter output and a DA converter input not through a processing circuit so as to measure accurately the AD conversion state. CONSTITUTION:An output of an adder 14 is given to a DA converter 7 via a selector 6 to form a camera output signal. An output of the AD converter 4 is connected directly to a selector 6 not through a processing circuit to form a camera output signal, that is, a luminance signal processing circuit 5 and a white balance 8 and then a color encoder 11. The selector 6 is a circuit selecting whether an output of an adder 14 as an input signal to a converter 7 or an output of the converter 4. With the selector thrown to the position of the AD converter, the output of the converter 4 is connected directly to the input of a converter 7. Thus, the waveform subject to AD processing is obtained at the camera output and a phase setting circuit 12 makes adjustment so as to be equal to the input waveform of the converter 4.

Description

【発明の詳細な説明】 〈産業上の利用分野〉 本発明は、ディジタル的に信号処理を行なうディジタル
ビデオカメラの？ｌＩｌ成に関するものである。[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a digital video camera that performs digital signal processing. It is related to IIl formation.

〈従来の技術〉 第４図に従来のディジタルビデオカメラの得成の例を示
す。ＣＣＤＩの出力をＣＤ５（相関２重サンプル回路）
等のアナログ処理回路２全通して信号処理した後、ＬＰ
Ｆ　３にて次段に設けられたＡＤコンパ−５４のクロッ
クの半分以下に帯域を制限する。これをＡＤコンバータ
４に入力してディジタル信号に変換し、カンマ、アパー
チャ補正等の輝度信号処理（ロ）路５にて輝度信号が作
成される。<Prior Art> FIG. 4 shows an example of a conventional digital video camera. CCDI output to CD5 (correlated double sample circuit)
After signal processing through analog processing circuit 2 such as
At F3, the band is limited to less than half the clock of the AD comparator 54 provided at the next stage. This is input to an AD converter 4 and converted into a digital signal, and a luminance signal is created in a luminance signal processing (b) path 5 that performs comma and aperture correction.

一方ＡＤコンバータ４の出力をホワイトバラヤス回路８
、ＬＰＦ９、夏Ｈ遅延巌１０、カラーエンコーダ１１を
通してＮＴＳＣカラー信号が作成される。On the other hand, the output of the AD converter 4 is transferred to the white balance circuit 8.
, an LPF 9, a summer H delay gate 10, and a color encoder 11 to create an NTSC color signal.

これ七上述の輝度信号を合成してカメラ出力信号？得る
。Is this the camera output signal by combining the seven brightness signals mentioned above? obtain.

〈発明が解決し二うとする問題点〉 ここでＬＰＦ　３の出力波形は第３図の工うになりてお
り、ＡＤコンバータ４はこの入力信号に対して一定の決
められた位相関係にある点（例えばＡ。<Problems to be solved by the invention> Here, the output waveform of the LPF 3 is as shown in FIG. 3, and the AD converter 4 has a fixed phase relationship with this input signal ( For example A.

〜Ａ点）をＡＤ変換することが要求されるｎこのために
ＡＤコンバータ４のクロックの位相設定回路Ｊ２が設け
られ、ここで遅延量を調整することに工Ｖ第３図のＡｉ
点がＡＤ変換される工うに調整される。しかしながら第
３図のＡｉ点がＡＤＫ換されたどうかを確認するために
は、調整作業時に別ＯＤＡコンバータ等の回路をＡＤコ
ンバータ４の出力に接続する必要があり、このためにカ
メラシステムにそのための出力端子を設けておく必要が
あった０ 本発明は上記従来のデイシタルビチオカメラの問題点に
鑑み、ＡＤコンバータのクロックの位相を正しく設定す
るためのニジ簡略な手段を実現することである。For this purpose, a clock phase setting circuit J2 of the AD converter 4 is provided to adjust the delay amount.
The points are adjusted to be AD converted. However, in order to confirm whether or not point Ai in Figure 3 has been converted to ADK, it is necessary to connect a circuit such as another ODA converter to the output of AD converter 4 during adjustment work, and for this purpose, the camera system must be connected to the output of AD converter 4. In view of the above-mentioned problems of the conventional digital camera, it is an object of the present invention to realize a simple means for correctly setting the phase of the clock of an AD converter. .

〈問題点を解決するだめの手段〉 このために本発明は、カメラシステムにＡＤコンバーメ
出力とＤＡコンバーメ入力とを処理回路を介することな
く接続するモードを設け、ＡＤ変換する状況を正確に測
定できる工うに構成して、ＡＤコンバーメのクロックの
位相調整を↓り正確かつ簡単に行なえる工うにする。<Means to Solve the Problem> For this purpose, the present invention provides a mode in which the AD converter output and DA converter input are connected to the camera system without going through a processing circuit, so that the AD conversion situation can be accurately measured. By configuring the system to make it possible to adjust the phase of the AD converter clock more accurately and easily.

〈発明の作用〉 第１図は本発明によるディジタル信号処理回路の一例で
ある。セレクタ６’ｒＡＤに切換えることに↓す、ＡＤ
コンバータ４の出力がカメラ出力のためのディジタル処
理回路１３を介することなくＤＡコンバータ７の入力に
直結され、出力にアナログ信号として出力される０この
出力とＡ　Ｉ）コンバータ４の入力とをシンクロスコー
プで同時に観測して出力が入力と同一の波形となるよう
にＡＤコンバータのクロックの位相を位相設定１９１路
１２にて、調整することにエリ設定する。<Operation of the Invention> FIG. 1 shows an example of a digital signal processing circuit according to the present invention. I decided to switch to selector 6'rAD↓, AD
The output of the converter 4 is directly connected to the input of the DA converter 7 without going through the digital processing circuit 13 for camera output, and is output as an analog signal. It is set to adjust the phase of the clock of the AD converter using the phase setting path 191 so that the output has the same waveform as the input when observed at the same time.

〈実施例〉 第２図は本発明を実施したディジタルビデオカメラシス
テムの一例である０ ＣＣＵＩから取り込壕れたカメラ撮像信号は、アナログ
処理回路２及びＬＰＦａを経て信号レベル及び帯域等に
処理が施こされてＡＤコンバータ４に与えられる。ＡＤ
コンバータ４では入力されたアナログ信号に対して所定
の位相関係でサンプリングし、ディジタル信号に変換さ
れる。変換されたディジタル信号は従来システムと同様
に輝度信号処理回路５を経て輝度信号が形成されると共
に、　Ｘ５７ ホワイトハフン回路８等を経てカラーエンコータ１１か
らカラー信号が形成され、両信号が加算器１４で加算さ
れてカメラ出力信号が形成される０ここで加算器Ｍの出
力はセレクタ６を介してＴ）　Ａコンバータ７に与えら
れてカメラ出力信号が形成される。上記ＡＤコンバータ
４の出力は上述の工うにカメラ出力信号を形成するため
の処理回路に入力されると共に、このような処理回路を
経ることなく直ちにセレクタ６に与えられる。セレクタ
６ＵＤＡコンバータ７への入力信号として、加算器１４
の出力を選択するかＡＤコンバータ４の出力を選択する
かを切換える回路で調整側ＡＤにすることにニジＡＤコ
ンバータ４の出力がＤＡコンバータ７の入力にその１１
直結され、ＡＤされた波形をカメラ出力に得ることがで
きる。この出力波形をＡＤコンバータ４の入力波形とで
きるだけ等しくなるＬうにＡＤコンバータ４に接続され
たクロック位相設定回路１２を調整する。<Example> Figure 2 shows an example of a digital video camera system implementing the present invention.0 The camera image signal taken in from the CCUI is processed to the signal level, band, etc. through the analog processing circuit 2 and LPFa. is applied to the AD converter 4. A.D.
The converter 4 samples the input analog signal with a predetermined phase relationship and converts it into a digital signal. The converted digital signal passes through the luminance signal processing circuit 5 to form a luminance signal as in the conventional system, and also passes through the X57 White-Huffn circuit 8 and the like to form a color signal from the color encoder 11, and both signals are sent to the adder. 14 to form a camera output signal. Here, the output of the adder M is applied via a selector 6 to a converter 7 to form a camera output signal. The output of the AD converter 4 is input to the processing circuit for forming the camera output signal as described above, and is immediately provided to the selector 6 without passing through such a processing circuit. Adder 14 as input signal to selector 6UDA converter 7
The output of the AD converter 4 is connected to the input of the DA converter 7 in the circuit that switches between selecting the output of the AD converter 7 and the output of the AD converter 7.
A directly connected and AD-added waveform can be obtained as a camera output. The clock phase setting circuit 12 connected to the AD converter 4 is adjusted so that this output waveform is as equal as possible to the input waveform of the AD converter 4.

く効果〉 以上のよって本発明に工れば、調整用ＯＤＡコンバータ
等を用いることなく、容易にＡＤコンバータのクロック
の位相を設定することができ、その効果は太きい。父、
市場でＣＣＵやＡＤコンバータを交換した時もＡＤコン
バータのクロックの位相の再設定が必要となるが、それ
に対しても本発明にエリ容易に行なえる。Effects> As described above, if the present invention is implemented, the phase of the clock of the AD converter can be easily set without using an ODA converter for adjustment, etc., and the effect is significant. father,
Even when a CCU or an AD converter is replaced in the market, it is necessary to reset the clock phase of the AD converter, but this can be easily done using the present invention.

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

第１図は本発明の基本構成を示すブロック図、第２図は
本発明の一実施例を示すデイシタルビチオカメラの要部
ブロック図、第３図はＡＤコンバーメの入力の一例を示
す図、第４図は従来のディジタルビデオカメラの要部ブ
ロック図である。 ４二ＡＤコンバータ　６：セレクタ　７：ＤＡコンバー
タ　１２：位相設定回路Fig. 1 is a block diagram showing the basic configuration of the present invention, Fig. 2 is a block diagram of main parts of a digital camera showing an embodiment of the invention, and Fig. 3 is a diagram showing an example of AD converter input. , FIG. 4 is a block diagram of the main parts of a conventional digital video camera. 42 AD converter 6: Selector 7: DA converter 12: Phase setting circuit

Claims (1)

【特許請求の範囲】 １、撮像素子によるアナログ画像信号を一旦ディジタル
信号に変換して、該ディジタル状態で信号処理を施こし
た後、再びアナログ信号に変換してカメラ出力信号を形
成するディジタルビデオカメラにおいて、 ＤＡコンバータの入力段に、ＡＤコンバータ出力を直ち
に入力する切換回路を設けてなることを特徴とするディ
ジタルビデオカメラ。[Claims] 1. Digital video in which an analog image signal from an image sensor is first converted into a digital signal, signal processing is performed in the digital state, and then converted back into an analog signal to form a camera output signal. A digital video camera characterized in that the input stage of the DA converter is provided with a switching circuit for immediately inputting the output of the AD converter.
JP63068974A 1988-03-22 1988-03-22 Digital video camera Expired - Fee Related JPH0738695B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63068974A JPH0738695B2 (en) 1988-03-22 1988-03-22 Digital video camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63068974A JPH0738695B2 (en) 1988-03-22 1988-03-22 Digital video camera

Publications (2)

Publication Number Publication Date
JPH01241275A true JPH01241275A (en) 1989-09-26
JPH0738695B2 JPH0738695B2 (en) 1995-04-26

Family

ID=13389152

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63068974A Expired - Fee Related JPH0738695B2 (en) 1988-03-22 1988-03-22 Digital video camera

Country Status (1)

Country Link
JP (1) JPH0738695B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1371618A1 (en) 2002-06-14 2003-12-17 Asahi Fiber Glass Company, Limited Fiber for reinforcing rubber products and process for its production
JP2010157849A (en) * 2008-12-26 2010-07-15 Olympus Medical Systems Corp Imaging device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59205863A (en) * 1983-04-18 1984-11-21 アルカテル・エヌ・ブイ Programmable encoding/decoding device
JPS6024793A (en) * 1983-07-19 1985-02-07 Matsushita Electric Ind Co Ltd Color solid-state image pickup device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59205863A (en) * 1983-04-18 1984-11-21 アルカテル・エヌ・ブイ Programmable encoding/decoding device
JPS6024793A (en) * 1983-07-19 1985-02-07 Matsushita Electric Ind Co Ltd Color solid-state image pickup device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1371618A1 (en) 2002-06-14 2003-12-17 Asahi Fiber Glass Company, Limited Fiber for reinforcing rubber products and process for its production
JP2010157849A (en) * 2008-12-26 2010-07-15 Olympus Medical Systems Corp Imaging device

Also Published As

Publication number Publication date
JPH0738695B2 (en) 1995-04-26

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