JPH0432857Y2 - - Google Patents

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Publication number
JPH0432857Y2
JPH0432857Y2 JP1984126235U JP12623584U JPH0432857Y2 JP H0432857 Y2 JPH0432857 Y2 JP H0432857Y2 JP 1984126235 U JP1984126235 U JP 1984126235U JP 12623584 U JP12623584 U JP 12623584U JP H0432857 Y2 JPH0432857 Y2 JP H0432857Y2
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JP
Japan
Prior art keywords
circuit
signal
luminance signal
reproduced
frequency
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Expired
Application number
JP1984126235U
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Japanese (ja)
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JPS6142179U (en
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Priority to JP12623584U priority Critical patent/JPS6142179U/en
Publication of JPS6142179U publication Critical patent/JPS6142179U/en
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Description

【考案の詳細な説明】 〔産業上の利用分野〕 この考案は、再生時のFM反転現象を防止する
ようにしたビデオテープレコーダに関する。
[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a video tape recorder that prevents the FM reversal phenomenon during playback.

〔従来の技術〕[Conventional technology]

従来、民生用(家庭用)のビデオテープレコー
ダは、テープ消費量を少なくするとともに小型軽
量化を図をため、テープに高密度記録が行なわ
れ、このときテープに記録される信号の高域周波
数は、テープとヘツドとの相対速度などにもとづ
く限界の周波数にまで達している。
Traditionally, consumer (home) video tape recorders have been designed to reduce the amount of tape consumed and to be smaller and lighter. At this time, high-density recording is performed on the tape, and at this time, the high frequency of the signal recorded on the tape is has reached a limit frequency based on factors such as the relative speed between the tape and the head.

ところでテープのビデオトラツクに記録される
信号は、ビデオ信号中の輝度信号をFM変調した
FM変調輝度信号と、ビデオ信号中の色信号を
FM変調輝度信号の低域に変換した低域変換色信
号とからなる。
By the way, the signal recorded on the video track of the tape is an FM modulated version of the luminance signal in the video signal.
FM modulated luminance signal and color signal in video signal
It consists of a low frequency converted color signal obtained by converting the FM modulated luminance signal to a low frequency signal.

さらに、輝度信号をFM変調するときは、該
FM変調による高域成分のS/Nの劣化を防止す
るため、変調前に輝度信号をプリエンフアシス処
理し、輝度信号の高域を増強することが行なわれ
る。
Furthermore, when performing FM modulation on the luminance signal,
In order to prevent deterioration of S/N of high frequency components due to FM modulation, pre-emphasis processing is performed on the luminance signal before modulation to enhance the high frequency range of the luminance signal.

そこでテープのビデオトラツクに記録される信
号は、低域変換色信号の高域に、プリエンフアシ
ス処理された輝度信号をFM変調したFM変調輝
度信号が位置する信号になり、このときFM変調
輝度信号は、たとえば輝度レベルが低から高に急
変する個所の周波数変移が最も大きくなり、該個
所の周波数が最も高くなる。
Therefore, the signal recorded on the video track of the tape is a signal in which the FM modulated luminance signal, which is FM modulated on the pre-emphasized luminance signal, is located in the high frequency range of the low frequency converted color signal, and at this time, the FM modulated luminance signal is For example, the frequency shift at a location where the brightness level suddenly changes from low to high is the largest, and the frequency at that location is the highest.

一方、前述のように限界の周波数にまで達した
信号が高密度記録されたテープを再生する場合、
再生回路の調整不良などにより、とくに搬送波信
号より高周波の6〜7MHzの高域成分が十分に再
生されないと、再生FM輝度信号の高域成分のレ
ベルが低くなる。
On the other hand, when playing back a tape on which signals reaching the limit frequency are recorded at high density, as mentioned above,
If the high frequency components of 6 to 7 MHz, which are higher in frequency than the carrier signal, are not sufficiently reproduced due to poor adjustment of the reproduction circuit, the level of the high frequency components of the reproduced FM luminance signal will be low.

そして再生FM輝度信号をFM復調して再生輝
度信号を得るために、通常、ビデオヘツドの再生
FM輝度信号は、前段増幅された後にリミツタ増
幅回路によりリミツタ増幅され、このとき再生
FM輝度信号の高域成分のレベルが低ければ、リ
ミツタ増幅回路からFM復調回路に出力される
FM輝度信号はとくに高周波の部分が欠落し、い
わゆるFM反転現象(破れ現象)が生じ易くな
る。
Then, in order to FM demodulate the reproduced FM brightness signal and obtain the reproduced brightness signal, the video head is usually
The FM luminance signal is amplified in the first stage and then limiter amplified by the limiter amplifier circuit, and at this time the reproduced
If the level of the high frequency component of the FM luminance signal is low, it is output from the limiter amplifier circuit to the FM demodulation circuit.
The FM luminance signal particularly loses the high frequency part, making it easy for so-called FM inversion phenomenon (broken phenomenon) to occur.

なお、FM反転現象が生じると、再生画面には
FM反転現象にもとづく黒いノイズが生じる。
In addition, when the FM reversal phenomenon occurs, the playback screen will display
Black noise occurs due to the FM inversion phenomenon.

そこで従来は、FM反転現象を防止するため、
たとえばビデオヘツドと回路容量とにより、再生
FM輝度信号の高域成分のレベルを高める共振回
路を形成し、該共振回路により、リミツタ増幅回
路に入力される再生FM輝度信号の高域成分のレ
ベルを高めるようにしている。
Therefore, in order to prevent the FM reversal phenomenon, conventionally,
For example, depending on the video head and circuit capacity, playback
A resonant circuit is formed to increase the level of the high frequency component of the FM luminance signal, and the resonant circuit increases the level of the high frequency component of the reproduced FM luminance signal input to the limiter amplifier circuit.

また、特開昭57−24177号公報には、再生され
たFM被変調波信号中の黒レベルに対応した周波
Dの搬送波を他の周波数の搬送波よりも遅延さ
せるような特性をもたせた移相回路11を、リミ
ツタ増幅回路に相当するリミツタ回路6の前段に
設けるとともに、リミツタ回路6の後段に、増幅
器5および位相回路11の位相の周波数との和が
直線的になる位相の周波数特性の位相補償回路1
2を設け、FM反転現象を防止することが記載さ
れている。
Furthermore, Japanese Patent Application Laid-Open No. 57-24177 discloses a phase shifter that has a characteristic of delaying the carrier wave of frequency D corresponding to the black level in the reproduced FM modulated wave signal than the carrier waves of other frequencies. The circuit 11 is provided at the front stage of the limiter circuit 6 which corresponds to a limiter amplifier circuit, and at the rear stage of the limiter circuit 6, the phase of the frequency characteristic of the phase in which the sum of the frequency of the phase of the amplifier 5 and the phase circuit 11 is linear is provided. Compensation circuit 1
2 to prevent the FM reversal phenomenon.

〔考案が解決しようとする問題点〕[Problem that the invention attempts to solve]

ところで前述のように、共振回路によりリミツ
タ増幅回路に入力される再生FM輝度信号の高域
成分のレベルを高める場合、S/Nなどの面か
ら、高める周波数を5MHz以上にすることは困難
であり、実際には6〜7MHzの高域成分のレベル
低下にもとづくFM反転現象を防止することが困
難である。
By the way, as mentioned above, when increasing the level of the high frequency component of the reproduced FM luminance signal input to the limiter amplifier circuit using a resonant circuit, it is difficult to increase the frequency to 5 MHz or higher from the viewpoint of S/N. In reality, it is difficult to prevent the FM inversion phenomenon due to a drop in the level of high-frequency components of 6 to 7 MHz.

また、前記公報のように、黒レベルに対応した
周波数Dの成分、すなわち再生FM変調信号の低
域成分を遅延させてリミツタ回路6に入力すれ
ば、たとえば黒レベルから白レベルに急激に変化
する個所の再生FM変調信号は周波数がさらに高
くなり、FM反転現象が生じ易くなる問題点があ
る。
Furthermore, as in the above-mentioned publication, if the frequency D component corresponding to the black level, that is, the low frequency component of the reproduced FM modulation signal, is delayed and input to the limiter circuit 6, for example, a sudden change from the black level to the white level can be achieved. There is a problem in that the frequency of the reproduced FM modulation signal becomes higher in some places, making it easier for FM inversion to occur.

〔問題点を解決するための手段〕[Means for solving problems]

この考案は、ビデオヘツドの再生FM輝度信号
をリミツタ増幅回路を介してFM復調回路に入力
し、前記再生FM輝度信号を復調処理するビデオ
テープレコーダにおいて、前記リミツタ増幅回路
の前段に、前記再生FM輝度信号の搬送波信号よ
り高周波の高域成分の時間軸を遅延する遅延回路
を設けたビデオテープレコーダである。
This invention provides a video tape recorder in which a reproduced FM brightness signal of a video head is input to an FM demodulation circuit via a limiter amplifier circuit, and the reproduced FM brightness signal is demodulated. This video tape recorder is provided with a delay circuit that delays the time axis of high-frequency components of higher frequencies than the carrier wave signal of the luminance signal.

〔作用〕[Effect]

そして、リミツタ増幅回路に入力される再生
FM輝度信号の搬送波信号より高い高域成分は、
遅延回路により、周波数が低くなる方向に遅延さ
れ、このときたとえば黒レベルから白レベルに急
激に変化する個所の周波数変移がゆるやかにな
り、リミツタ増幅回路から出力される再生FM輝
度信号に欠落が生じなくなる。
Then, the playback input to the limiter amplifier circuit
The high frequency component higher than the carrier signal of the FM luminance signal is
The delay circuit delays the frequency in the direction of lowering, and at this time, for example, the frequency transition at a point where there is a sudden change from the black level to the white level becomes gradual, causing a drop in the reproduced FM luminance signal output from the limiter amplifier circuit. It disappears.

〔実施例〕〔Example〕

つぎに、この考案を、その1実施例を示した図
面とともに詳細に説明する。
Next, this invention will be explained in detail with reference to drawings showing one embodiment thereof.

第1図において、1はビデオヘツド、2はビデ
オヘツド1に接続された前段増幅回路、3は増幅
回路2に接続された遅延回路、4は遅延回路3に
接続されたリミツタ増幅回路、5は増幅回路4に
接続された補正回路、6は補正回路5に接続され
たFM復調回路である。
In FIG. 1, 1 is a video head, 2 is a preamplifier circuit connected to video head 1, 3 is a delay circuit connected to amplifier circuit 2, 4 is a limiter amplifier circuit connected to delay circuit 3, and 5 is a preamplifier circuit connected to video head 1. A correction circuit is connected to the amplifier circuit 4, and 6 is an FM demodulation circuit connected to the correction circuit 5.

そしてビデオヘツド1によりテープから再生さ
れたFM輝度信号、すなわち再生FM輝度信号は、
前段増幅回路2により前段増幅された後、遅延回
路3に入力され、このとき遅延回路3は、第2図
に示すように約4MHz以上の成分に対する時間軸
を高周波になる程大きく遅延する特性を有し、該
特性にもとづき、遅延回路3に入力された再生
FM輝度信号は、6〜7MHzの成分を含む搬送波
信号より高周波の高域成分の周波数が低くなる方
向に遅延される。なお、遅延回路3によつて再生
FM輝度信号が増幅されることはない。
The FM brightness signal reproduced from the tape by video head 1, that is, the reproduced FM brightness signal is
After being pre-amplified by the pre-amplifier circuit 2, it is input to the delay circuit 3. At this time, the delay circuit 3 has a characteristic that the higher the frequency, the greater the delay in the time axis for components of about 4 MHz or higher, as shown in FIG. and based on the characteristics, the reproduction input to the delay circuit 3
The FM luminance signal is delayed in such a direction that the frequency of high-frequency components of the FM luminance signal is lower than that of the carrier wave signal containing components of 6 to 7 MHz. In addition, the delay circuit 3 reproduces
The FM luminance signal is never amplified.

ところでFM変調される前の輝度信号が、第3
図aの実線に示すように黒レベルから白レベルに
急に変化する個所がプリエンフアシス処理により
急峻に強調された信号の場合、該信号をFM変調
してテープに記録されたFM輝度信号は、前記黒
レベルから白レベルに急に変化する個所で周波数
が著しく高くなる。なお、図中のt1はレベルの変
化点を示す。
By the way, the luminance signal before FM modulation is
As shown by the solid line in Figure a, in the case of a signal where the part where the black level suddenly changes to the white level is sharply emphasized by pre-emphasis processing, the FM luminance signal recorded on the tape by FM modulating the signal is The frequency becomes significantly higher at the point where there is a sudden change from black level to white level. Note that t 1 in the figure indicates a point at which the level changes.

そして第3図aの輝度信号にもとづくFM輝度
信号をビデオヘツド1により再生すると、前段増
幅回路2から出力される再生FM輝度信号は、同
図bに示すように前記黒レベルから白レベルに急
に変化する個所で急激な周波数変移が生じ、白レ
ベルの端部の周波数が、たとえば6〜7MHzに著
しく高くなるとともに、このとき従来のように共
振回路などを設けて高域成分を高めることを行な
わないため、高域成分のレベルが、高周波になる
程低くなる。なお、図中のta,tb,tc,tdは振幅
のピーク点を示す。
When the video head 1 reproduces the FM luminance signal based on the luminance signal shown in FIG. A sudden frequency shift occurs at the point where the white level changes, and the frequency at the edge of the white level becomes significantly high, for example, 6 to 7 MHz. Since this is not done, the level of high-frequency components becomes lower as the frequency increases. Note that ta, tb, tc, and td in the figure indicate the peak points of amplitude.

したがつて、第3図bの再生FM輝度信号を、
従来のように直接リミツタ増幅回路4に入力する
と、このとき前記黒レベルから白レベルに変化す
る個所の白レベルの端部の周波数が著しく高いた
め、欠落が生じてFM反転現象が生じる。
Therefore, the reproduced FM luminance signal in Fig. 3b is
If the signal is directly input to the limiter amplifier circuit 4 as in the conventional case, the frequency at the end of the white level where the black level changes from the black level to the white level is extremely high, so that a dropout occurs and an FM inversion phenomenon occurs.

しかし、第1図の場合は、前段増幅回路2から
出力された第3図bの再生FM輝度信号が遅延回
路3に入力され、該遅延回路3により6〜7MHz
を含む高域成分の時間軸が遅延されるため、遅延
回路3を介してリミツタ増幅回路4に入力される
再生FM輝度信号は同図cに示すように、前記黒
レベルから白レベルに変化する個所の白レベルの
端部の周波数が低くなり、該個所の周波数変移が
ゆるやかになる。なお、図中のta′,tb′,tc′,
td′は振幅のピーク点を示す。
However, in the case of FIG. 1, the reproduced FM luminance signal of FIG.
Since the time axis of high-frequency components including The frequency at the end of the white level at a certain point becomes low, and the frequency shift at that point becomes gradual. In addition, ta′, tb′, tc′,
td′ indicates the peak point of amplitude.

そこでリミツタ増幅回路4により、遅延回路3
を介して入力された再生FM輝度信号をリミツタ
増幅しても、前記白レベルの端部などが欠落せ
ず、FM反転現象が防止される。なお、遅延回路
3が再生FM輝度信号を増幅しないため、従来の
共振回路を設けたときのようなS/Nの劣化など
が生じることはない。
Therefore, the limiter amplifier circuit 4 allows the delay circuit 3 to
Even if the reproduced FM luminance signal inputted through the limiter is amplified, the edge of the white level and the like will not be lost, and the FM inversion phenomenon will be prevented. Note that since the delay circuit 3 does not amplify the reproduced FM luminance signal, the S/N ratio does not deteriorate as would occur when a conventional resonant circuit is provided.

そしてリミツタ増幅回路4の出力信号をFM復
調回路6に直接入力しても、反転現象のない再生
輝度信号が得られ、該再生輝度信号にもとづく再
生画面にはFM反転現象にもとづく黒いノイズの
生じることはない。
Even if the output signal of the limiter amplifier circuit 4 is directly input to the FM demodulation circuit 6, a reproduced luminance signal without any inversion phenomenon can be obtained, and a reproduction screen based on the reproduced luminance signal has black noise due to the FM inversion phenomenon. Never.

しかし、遅延回路3により高域成分の時間軸を
遅延したことにより、リミツタ増幅回路4の出力
信号をFM復調回路6に直接入力して得られる再
生輝度信号は、第3図aの破線に示すように、立
上りの時間が実線に示す元の輝度信号より長くな
り、いわゆる波形なまりが生じる。
However, since the time axis of the high frequency component is delayed by the delay circuit 3, the reproduced luminance signal obtained by directly inputting the output signal of the limiter amplifier circuit 4 to the FM demodulation circuit 6 is shown by the broken line in FIG. 3a. , the rise time becomes longer than the original luminance signal shown by the solid line, and so-called waveform rounding occurs.

そこで第1図の場合は、リミツタ増幅回路4と
FM復調回路6との間に、第4図に示すように第
2図の遅延特性を相殺する特性、すなわち約4M
Hz以下の成分の時間軸をかなり大きな一定量だけ
遅延するとともに、約4MHz以上の成分の時間軸
を周波数に反比例した量だけ遅延する特性の補正
回路5を設け、FM復調回路6に入力される信号
を、再び第3図bの信号に戻し、前述の波形なま
りを防止し、FM復調回路6から元の輝度信号と
同じ立ち上り時間の再生輝度信号を出力し、FM
反転現象にもとづく黒いノイズがなく、かつ鮮明
な再生画面を提供する。
Therefore, in the case of Fig. 1, the limiter amplifier circuit 4 and
As shown in FIG. 4, there is a connection between the FM demodulation circuit 6 and the
A correction circuit 5 is provided which has a characteristic of delaying the time axis of components below Hz by a fairly large fixed amount and delaying the time axis of components above about 4 MHz by an amount inversely proportional to the frequency, and is input to the FM demodulation circuit 6. The signal is returned to the signal shown in FIG. 3b again to prevent the waveform rounding described above, and the FM demodulation circuit 6 outputs a reproduced luminance signal with the same rise time as the original luminance signal.
To provide a clear playback screen without black noise caused by an inversion phenomenon.

なお、補正回路5によつてもFM復調回路に入
力される信号が増幅されることはなく、補正回路
5によるS/Nの劣化などが生じることはない。
また、前述の波形なまりを防止する必要がなく、
FM反転現象のみを防止するときは、補正回路5
を設ける必要はない。
Note that the signal input to the FM demodulation circuit is not amplified by the correction circuit 5, and the S/N ratio does not deteriorate due to the correction circuit 5.
In addition, there is no need to prevent the waveform rounding mentioned above,
To prevent only the FM reversal phenomenon, use the correction circuit 5.
There is no need to provide

ところで遅延回路3および補正回路5は、たと
えば第5図に示すようにそれぞれ構成して形成す
ることができ、同図において、Qはベースが入力
端子1に接続されたNPN型のトランジスタであ
り、エミツタが抵抗R1を介してアースされ、コ
レクタが抵抗R2を介して電源端子+Bに接続さ
れている。C,LはトランジスタQのコレクタと
出力端子Oとの間に直列に設けられたコンデン
サ、コイル、R3はトランジスタQのエミツタと
出力端子Oとの間に設けられた抵抗である。
By the way, the delay circuit 3 and the correction circuit 5 can be formed by respectively configuring them as shown in FIG. 5, for example, in which Q is an NPN type transistor whose base is connected to the input terminal 1, The emitter is grounded via a resistor R1, and the collector is connected to a power supply terminal +B via a resistor R2. C and L are capacitors and coils provided in series between the collector of the transistor Q and the output terminal O, and R3 is a resistor provided between the emitter of the transistor Q and the output terminal O.

なお、遅延回路3の場合は、コンデンサC、コ
イルL、抵抗R3の値を、高域成分の時間軸を遅
らせる値に設定し、補正回路5の場合は、コンデ
ンサC、コイルL、抵抗R3の値を低域成分の時
間軸を遅らせる値に設定するのは勿論である。
In the case of delay circuit 3, the values of capacitor C, coil L, and resistor R3 are set to values that delay the time axis of the high frequency component, and in the case of correction circuit 5, the values of capacitor C, coil L, and resistor R3 are set to values that delay the time axis of the high frequency component. Of course, the value is set to a value that delays the time axis of the low frequency component.

〔考案の効果〕[Effect of idea]

したがつて、この考案のビデオテープレコーダ
によると、遅延回路を設けたことにより、リミツ
タ増幅回路に入力される再生FM輝度信号中の、
たとえば黒レベルから白レベルに急激に変化する
個所の周波数変移がゆるやかになり、このとき再
生FM輝度信号のレベル変化は生じないため、
S/Nの劣化などを生じないようにしてFM反転
現象を防止することができる。
Therefore, according to the video tape recorder of this invention, by providing the delay circuit, the reproduction FM luminance signal input to the limiter amplifier circuit is
For example, the frequency transition at a point where there is a sudden change from the black level to the white level becomes gradual, and at this time there is no level change in the reproduced FM luminance signal.
The FM reversal phenomenon can be prevented by not causing S/N deterioration.

また、実施例のように遅延回路とともに補正回
路を設けると、波形なまりを防止してFM反転現
象を防止することができ、この場合は、FM反転
現象による黒いノイズがなく、かつ鮮明な画質の
再生画面を提供することができる。
Furthermore, if a correction circuit is provided along with the delay circuit as in the example, it is possible to prevent waveform rounding and prevent the FM inversion phenomenon.In this case, there is no black noise caused by the FM inversion phenomenon and clear image quality A playback screen can be provided.

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

図面はこの考案のビデオテープレコーダの1実
施例を示し、第1図はブロツク図、第2図は遅延
回路の特性曲線図、第3図a〜cは遅延回路およ
び補正回路の動作説明用の波形図、第4図は補正
回路の特性曲線図、第5図は遅延回路、補正回路
の結線図である。 1……ビデオヘツド、3……遅延回路、4……
リミツタ増幅回路、6……FM復調回路。
The drawings show one embodiment of the videotape recorder of this invention; FIG. 1 is a block diagram, FIG. 2 is a characteristic curve diagram of a delay circuit, and FIGS. FIG. 4 is a waveform diagram, a characteristic curve diagram of the correction circuit, and FIG. 5 is a connection diagram of the delay circuit and the correction circuit. 1...Video head, 3...Delay circuit, 4...
Limiter amplifier circuit, 6...FM demodulation circuit.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] ビデオヘツドの再生FM輝度信号をリミツタ増
幅回路を介してFM復調回路に入力し、前記再生
FM輝度信号を復調処理するビデオテープレコー
ダにおいて、前記リミツタ増幅回路の前段に、前
記再生FM輝度信号の搬送波信号より高周波の高
域成分の時間軸を遅延する遅延回路を設けたビデ
オテープレコーダ。
The reproduced FM brightness signal of the video head is input to the FM demodulation circuit via the limiter amplifier circuit, and the reproduced
A video tape recorder that demodulates an FM luminance signal, further comprising a delay circuit that delays the time axis of a high-frequency component of a higher frequency than a carrier signal of the reproduced FM luminance signal, at a stage before the limiter amplifier circuit.
JP12623584U 1984-08-20 1984-08-20 video tape recorder Granted JPS6142179U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12623584U JPS6142179U (en) 1984-08-20 1984-08-20 video tape recorder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12623584U JPS6142179U (en) 1984-08-20 1984-08-20 video tape recorder

Publications (2)

Publication Number Publication Date
JPS6142179U JPS6142179U (en) 1986-03-18
JPH0432857Y2 true JPH0432857Y2 (en) 1992-08-06

Family

ID=30684917

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12623584U Granted JPS6142179U (en) 1984-08-20 1984-08-20 video tape recorder

Country Status (1)

Country Link
JP (1) JPS6142179U (en)

Also Published As

Publication number Publication date
JPS6142179U (en) 1986-03-18

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