JPH0326183A - Recording and reproducing device for video signal - Google Patents
Recording and reproducing device for video signalInfo
- Publication number
- JPH0326183A JPH0326183A JP1159709A JP15970989A JPH0326183A JP H0326183 A JPH0326183 A JP H0326183A JP 1159709 A JP1159709 A JP 1159709A JP 15970989 A JP15970989 A JP 15970989A JP H0326183 A JPH0326183 A JP H0326183A
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- Prior art keywords
- circuit
- recording
- terminal
- output
- frequency filter
- Prior art date
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- 230000000295 complement effect Effects 0.000 claims abstract description 13
- 238000010586 diagram Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
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- Television Signal Processing For Recording (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の゛利用分野）
本発明は、ＶＴＲ等の記録系および再生系において，ノ
イズ成分を低減し得る映像信号の記録再生装置に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a video signal recording and reproducing apparatus that can reduce noise components in recording and reproducing systems such as VTRs.
（従来の技術）
第２図（Ａ）は従来装置の記録系回路の一例を示し，第
２図（Ｂ）は従来装置の再生系回路の一例を示す。(Prior Art) FIG. 2(A) shows an example of a recording system circuit of a conventional device, and FIG. 2(B) shows an example of a reproduction system circuit of a conventional device.
第２図（Ａ）におル）て，端子９に入力した映像信号は
エンファシス回路ｌＯによって弱入力であるほど高周波
帯域の信号の振幅が強調される。エンファシス回路１０
の出力は周波数フィルタ回路１１によって中間周波帯域
が弱められて出力端子１２に出力される．この出力信号
は、たとえばＦＭ変調等の処理をなされたのち、磁気テ
ープ等に記録される。In FIG. 2(A), the video signal input to the terminal 9 is processed by the emphasis circuit 1O, so that the weaker the input, the more the amplitude of the signal in the high frequency band is emphasized. Emphasis circuit 10
The intermediate frequency band of the output is weakened by the frequency filter circuit 11 and output to the output terminal 12. This output signal is subjected to processing such as FM modulation, and then recorded on a magnetic tape or the like.
再生系においては、たとえば磁気テープ等より取出され
、ＦＭ復調等の処理をなされた映像信号は、第２図（Ｂ
）の端子ｌ３に入力し周波数フィルタ回路ｌ４によって
中間周波帯域が強められ、ディエンファシス回路１５を
介して出力端子１６に出力される。In the reproduction system, the video signal extracted from, for example, a magnetic tape and subjected to processing such as FM demodulation is shown in Figure 2 (B
), the intermediate frequency band is strengthened by the frequency filter circuit l4, and is output to the output terminal 16 via the de-emphasis circuit 15.
第２図（Ａ）のエンファシス回路１０の伝達特性をＥ、
周波数フィルタ回路１ｌの伝達特性をＫとすると、第２
図（Ｂ）の周波数フィルタ回路ｌ４の伝達特性は１／Ｋ
、ディエンファシス回路ｌ５の伝達特性は１／Ｅとなる
。したがって、（Ａ）の記録系回路の伝達特性はＥＫ、
（Ｂ）の再生系回路の伝達特性は１／ＥＫとなって互い
に相補的関係となり，（Ａ）の記録系回路を介したのち
、（Ｂ）の再生系回路を介して得られる信号は元の入力
信号と等しくなる．
第２１Ｍ（Ａ）のエンファシス回路１０、第２図（Ｂ）
のディエンファシス回路１５の伝達特性はそれぞれ，第
３図（Ａ），第３図（Ｂ）に示す如くであり、また、第
２図（ Ａ． ’）の周波数フィルタ回路１１．第２図
（Ｂ）の周波数フィルタ回路ｌ４の伝達特性は、それぞ
れ第４図（Ａ），第４図（Ｂ）に示す如くとなる。The transfer characteristic of the emphasis circuit 10 in FIG. 2(A) is expressed as E,
If the transfer characteristic of the frequency filter circuit 1l is K, then the second
The transfer characteristic of the frequency filter circuit l4 in figure (B) is 1/K
, the transfer characteristic of the de-emphasis circuit l5 is 1/E. Therefore, the transfer characteristic of the recording circuit in (A) is EK,
The transfer characteristics of the playback circuit in (B) are 1/EK and have a mutually complementary relationship, and the signal obtained via the playback circuit in (B) after passing through the recording circuit in (A) is the original signal. is equal to the input signal of Emphasis circuit 10 of 21M(A), FIG. 2(B)
The transfer characteristics of the de-emphasis circuit 15 in FIG. 3(A) and FIG. 3(B) are respectively as shown in FIG. The transfer characteristics of the frequency filter circuit l4 in FIG. 2(B) are as shown in FIG. 4(A) and FIG. 4(B), respectively.
第５図は従来装置の他の例の回路図を示す。記録系と再
生系を１つの回路で兼用しており、エンファシス・ディ
エンファシス回路１７は制御端子１８に加える電圧によ
って伝達特性をＥおよび１／Ｅに切換えられるようにな
っている。FIG. 5 shows a circuit diagram of another example of the conventional device. A single circuit serves both as a recording system and a reproducing system, and the emphasis/de-emphasis circuit 17 can switch the transfer characteristic between E and 1/E by applying a voltage to a control terminal 18.
第５図の回路図において、端子１に入力した映像信号は
スイッチ回路１９を介してエンファシス・ディエンファ
シス回路■７に供給され、強調処理された信号は伝達特
性がＫなる周波数フィルタ回路５ｌを介して端子に出力
される。また再生時は、端子１に入力した映像信号は差
動増福器４の非反転入力端子に入力する。差動増幅器４
の出力端子より反転入力端子に向かって伝達特性がＫな
る周波数フィルタ回路５２が介されており、差動増幅器
４が十分な利得を有する場合、非反転入力端子から出力
端子への伝達特性は１／Ｋとなる。差動増幅器４の出力
信号は，スイッチ回路１９を介してエンファシス・ディ
エンファシス回路１７に入力し，復調処理されて出力端
子８に出力する６
（発明が解決しようとする課題）
第２図（Ａ），（Ｂ）に示した従来回路は、記録系回路
において伝達特性がＫなる周波数フィルタ回路１１と，
再生系回路において伝達特性が１／Ｋなる相補的な周波
数フィルタを必要とし、第５図に示した従来回路では、
伝達特性がＫなる周波数フィルタ回路を２個必要とする
．これらの周波数フィルタ回路は一般に複数の時定数を
持つ複数の抵抗器と容量で構成されるため、従来回路は
部品点数が多くなり，特に半導体集積回路に構或する場
合、外部部品点数が多くなる欠点があった。In the circuit diagram of FIG. 5, the video signal input to the terminal 1 is supplied to the emphasis/de-emphasis circuit 7 via the switch circuit 19, and the emphasized signal is sent via the frequency filter circuit 5l with a transfer characteristic of K. output to the terminal. Further, during reproduction, the video signal input to the terminal 1 is input to the non-inverting input terminal of the differential amplifier 4. Differential amplifier 4
A frequency filter circuit 52 having a transfer characteristic of K from the output terminal to the inverting input terminal is provided, and if the differential amplifier 4 has sufficient gain, the transfer characteristic from the non-inverting input terminal to the output terminal is 1. /K. The output signal of the differential amplifier 4 is input to the emphasis/de-emphasis circuit 17 via the switch circuit 19, demodulated and output to the output terminal 8. ), (B) have a frequency filter circuit 11 with a transfer characteristic of K in the recording system circuit,
A complementary frequency filter with a transfer characteristic of 1/K is required in the reproduction circuit, and the conventional circuit shown in Fig. 5 has the following characteristics:
Two frequency filter circuits with a transfer characteristic of K are required. These frequency filter circuits are generally composed of multiple resistors and capacitors with multiple time constants, so conventional circuits have a large number of components, and especially when configured in a semiconductor integrated circuit, the number of external components increases. There were drawbacks.
また、従来回路では，記録系と再生系で伝達特性が完全
に相補的になるようにするには，２つの周波数フィルタ
回路を構成する部品の時定数が一致するよう相対誤差を
十分管理しなければならない欠点があった。In addition, in conventional circuits, in order to make the transfer characteristics of the recording system and reproduction system completely complementary, relative errors must be sufficiently managed so that the time constants of the components that make up the two frequency filter circuits match. There were certain drawbacks.
本発明の目的は、従来の付点を解消し、一つの周波数フ
ィルタ回路が、記録時の伝達特性を得る回路と，再生時
の相補的伝達特性を得る回路の一部として両方で使用さ
れる記録再生装置を提供することである。It is an object of the present invention to eliminate the conventional dots, so that one frequency filter circuit can be used both as a circuit for obtaining transfer characteristics during recording and as part of a circuit for obtaining complementary transfer characteristics during playback. An object of the present invention is to provide a recording/playback device.
（課題を解決するための手段）
本発明の映像信号の記録再生装置は、映像信号を記録す
るときに弱入力があるほど高周波帯域の信号の振幅を強
調処理する伝達特性をもつエンファシス回路と、映像信
号を再生するときに、エンファシス回路と相補的伝達特
性をもつディエンファシス回路と，出力の位相に対して
反転と非反転の関係にある入力端子を備え、出力がディ
エンファシス回路の入力端子に供給される差動増幅器と
、低周波帯域の利得に対し中間周波帯域の利得が低く高
周波帯域の利得は中間周波帯域よりも高く設定された周
波数特性を有し、出力が差動増幅器の反転入力端子に供
給される周波数フィルタ回路と、エンファシス回路の出
力が供給される第１の入力端子と、差動増幅器の出力が
供給される第２の入力端子を備え記録時には第ｌの入力
を，再生時には第２の入力を周波数フィルタ回路の入力
端子に伝達するスイッチ回路とを具備し、記録時は映像
信号をエンファシス回路の入力端子に入力して、周波数
フィルタの出力端子より取り出し、再生時は映像信号を
差動増幅器の非反転入力端子より入力して，ディエンフ
ァシス回路の出力端子より取り出し、記録時と再生時の
伝達特性が相補的関係となるものである。(Means for Solving the Problems) A video signal recording and reproducing apparatus of the present invention includes an emphasis circuit having a transfer characteristic that emphasizes the amplitude of a signal in a high frequency band as the input becomes weaker when recording a video signal; When reproducing a video signal, a de-emphasis circuit with transfer characteristics complementary to the emphasis circuit is provided, and an input terminal is inverted and non-inverted with respect to the output phase, and the output is connected to the input terminal of the de-emphasis circuit. The supplied differential amplifier has a frequency characteristic in which the gain in the intermediate frequency band is lower than the gain in the low frequency band, and the gain in the high frequency band is set higher than that in the intermediate frequency band, and the output is the inverting input of the differential amplifier. A frequency filter circuit is supplied to the terminal, a first input terminal is supplied with the output of the emphasis circuit, and a second input terminal is supplied with the output of the differential amplifier. Sometimes it is equipped with a switch circuit that transmits the second input to the input terminal of the frequency filter circuit, and at the time of recording, the video signal is input to the input terminal of the emphasis circuit, and taken out from the output terminal of the frequency filter, and at the time of playback, the video signal is input to the input terminal of the emphasis circuit. A signal is input from the non-inverting input terminal of the differential amplifier and taken out from the output terminal of the de-emphasis circuit, so that the transfer characteristics during recording and reproduction have a complementary relationship.
（作 用）
本発明によれば、１つの周波数フィルタ回路が、記録時
の伝達特性を得る回路と、再生時の相補的伝達特性を得
る回路の一部として両方で使用されるものである。(Function) According to the present invention, one frequency filter circuit is used both as a circuit for obtaining transfer characteristics during recording and as part of a circuit for obtaining complementary transfer characteristics during reproduction.
（実施例）
本発明の実施例を第１図，第４図および第６図に基づい
て説明する。(Example) An example of the present invention will be described based on FIGS. 1, 4, and 6.
第１図は本発明の第１の実施例の記録再生装置の回路図
である。同図において、記録時は、端子１に入力した映
像信号はエンファシス回路２により、弱入力ほど高周波
帯域の信号の振幅が強調され、スイッチ回路３を介して
周波数フィルタ回路４に供給され、周波数フィルタ回路
４によって中間周波数帯域の信号が弱められて出力端子
５より取り出される。エンファシス回路２と周波数フィ
ルタ回路４の伝達特性は，既に説明したように、それぞ
れ第３図（Ａ），第４図（Ａ）に示す如くである。また
再生時は、端子ｌに入力した映像信号は差動増幅器６の
非反転入力端子に供給され、差動増幅器６の出力信号は
スイッチ回路３と周波数フィルタ回ｉ！８４を介して差
動増幅器６の反転入力端子に供給される。差動増幅器６
が十分な利得を有する場合、非反転入力端子から出力端
子への伝達特性は周波数フィルタ回路４の伝達特性と相
補的になる。差動増幅器６の出力はディエンファシス回
路７で復調処理され、出力端子８より取り出される。デ
ィエンファシス回路７の伝達特性は既に説明したように
、第３図ＣＢ）に示す如くである。FIG. 1 is a circuit diagram of a recording/reproducing apparatus according to a first embodiment of the present invention. In the figure, during recording, the video signal input to the terminal 1 is sent to the emphasis circuit 2, where the weaker the input, the more the amplitude of the signal in the high frequency band is emphasized, and the video signal is supplied to the frequency filter circuit 4 via the switch circuit 3, The intermediate frequency band signal is weakened by the circuit 4 and taken out from the output terminal 5. As already explained, the transfer characteristics of the emphasis circuit 2 and the frequency filter circuit 4 are as shown in FIG. 3(A) and FIG. 4(A), respectively. During playback, the video signal input to the terminal l is supplied to the non-inverting input terminal of the differential amplifier 6, and the output signal of the differential amplifier 6 is transmitted to the switch circuit 3 and the frequency filter circuit i! 84 to the inverting input terminal of the differential amplifier 6. Differential amplifier 6
has sufficient gain, the transfer characteristic from the non-inverting input terminal to the output terminal becomes complementary to the transfer characteristic of the frequency filter circuit 4. The output of the differential amplifier 6 is demodulated by a de-emphasis circuit 7 and taken out from an output terminal 8. As already explained, the transfer characteristics of the de-emphasis circuit 7 are as shown in FIG. 3 (CB).
第Ｌ図の回路図において、スイッチ回路３が周波数フィ
ルタ回路４に入力する信号の経路を切換えており，その
結果使用する周波数フィルタ回路は１つとなっている。In the circuit diagram of FIG. L, a switch circuit 3 switches the path of a signal input to a frequency filter circuit 4, and as a result, only one frequency filter circuit is used.
第６図は本発明の第２の実施例の回路図である．同図に
おいて、第５図に示した従来例の回路図同様、エンファ
シス・ディエンファシス回路１７は端子ｌ８に加える電
圧によって伝達特性を切換えられるようになっている。FIG. 6 is a circuit diagram of a second embodiment of the present invention. In this figure, similar to the conventional circuit diagram shown in FIG. 5, the emphasis/de-emphasis circuit 17 is configured so that its transfer characteristics can be switched by the voltage applied to the terminal l8.
第６図において、記録時は，端子ｌに入力した映像信号
はスイッチ回路１９を介してエンファシス・ディエンフ
ァシス回路１７に供給され，強調処理された信号は、ス
イッチ回路３周波数フィルタ回路４を介して出力端子５
より取り出される．再生時は端子１に入力した映像信号
は差動増幅器６の非反転入力端子に供給され、差動増幅
器６の出力信号はスイッチ回路３と周波数フィルタ回路
４を介して差動増幅器６の反転入力端子に供給される．
一方、差動増幅器６の出力信号はスイッチ回路１９を介
してエンファシス・ディエンファシス回路ｌ７に供給さ
れ復調処理されて出力端子８より取り出される。第６図
の回路図においてもスイッチ回路３が周波数フィルタ回
路４に入力する信号の経路を切換えており、その結果使
用する周波数フィルタ回路は１つとなっている。In FIG. 6, during recording, the video signal input to the terminal l is supplied to the emphasis/de-emphasis circuit 17 via the switch circuit 19, and the emphasized signal is sent via the switch circuit 3 to the frequency filter circuit 4. Output terminal 5
It is extracted from During playback, the video signal input to terminal 1 is supplied to the non-inverting input terminal of differential amplifier 6, and the output signal of differential amplifier 6 is supplied to the inverting input terminal of differential amplifier 6 via switch circuit 3 and frequency filter circuit 4. Supplied to the terminal.
On the other hand, the output signal of the differential amplifier 6 is supplied to the emphasis/de-emphasis circuit 17 via the switch circuit 19, demodulated, and taken out from the output terminal 8. Also in the circuit diagram of FIG. 6, the switch circuit 3 switches the path of the signal input to the frequency filter circuit 4, and as a result, only one frequency filter circuit is used.
（発明の効果）
本発明によれば、記録系と再生系とを１つの回路で兼用
し，その中でｌつの周波数フィルタを記録，再生の両方
で用いているため、記録，再生相方の伝達特性を理想的
に相補的関係とすることができ、従来の装置のように２
つの周波数フィルタ回路の相対誤差による影響がない。(Effects of the Invention) According to the present invention, one circuit serves both as a recording system and a reproducing system, and one frequency filter is used for both recording and reproducing. The characteristics can be ideally complementary, and unlike conventional devices, two
There is no effect due to the relative error of the two frequency filter circuits.
また本発明装置は従来の装置に比べ周波数フィルタ回路
を構成するための時定数回路の部品点数が少なく、特に
半導体集積回路にする場合、外部部品点数と端子数が少
なくてすみ，その実用上の効果は大である．In addition, compared to conventional devices, the device of the present invention has fewer components in the time constant circuit for configuring the frequency filter circuit, and especially when used in semiconductor integrated circuits, the number of external components and terminals can be reduced. The effect is great.
第１図は本発明の第１の実施例の回路図、第２図は従来
装置の一例の回路同、第３図（Ａ），（Ｂ）は従来装置
および本発明で用いられるエンファシス回路、ディエン
ファシス回路の伝達特性図、第４図（Ａ）は従来装置お
よび本発明装置の記録系で用いられる周波数フィルタ回
路の伝達特性図、第４図（Ｂ）は再生系の周波数フィル
タ回路の伝達特性図、第５図は従来装置の他の例の回路
図，第６図は本発明の第２の実施例の回路図である。
１ ・・・入力端子．２．１０・・・エンファシス回路
．３．１９・・・スイッチ回路、 ４．１１， １４，
５１， ５２・・・周波数フィルタ回路，５，１２・
・・記録信号出力端子， ６・・・差動増幅器、 ７，
１５・・・ディエンファシス回路．８．１６・・・再生
信号出力端子、１７・・・エンファシス・ディエンファ
シス回路、１８・・・制御端子。FIG. 1 is a circuit diagram of a first embodiment of the present invention, FIG. 2 is a circuit diagram of an example of a conventional device, and FIGS. 3 (A) and (B) are an emphasis circuit used in the conventional device and the present invention. A transfer characteristic diagram of the de-emphasis circuit, FIG. 4(A) is a transfer characteristic diagram of the frequency filter circuit used in the recording system of the conventional device and the device of the present invention, and FIG. 4(B) is a transfer characteristic diagram of the frequency filter circuit of the reproduction system. FIG. 5 is a circuit diagram of another example of the conventional device, and FIG. 6 is a circuit diagram of a second embodiment of the present invention. 1...Input terminal. 2.10... Emphasis circuit. 3.19...Switch circuit, 4.11, 14,
51, 52... frequency filter circuit, 5, 12.
...recording signal output terminal, 6...differential amplifier, 7,
15...De-emphasis circuit. 8.16... Reproduction signal output terminal, 17... Emphasis/de-emphasis circuit, 18... Control terminal.
Claims (1)
の信号の振幅を強調処理する伝達特性をもつエンファシ
ス回路と、映像信号を再生するときに、前記エンファシ
ス回路と相補的伝達特性をもつディエンファシス回路と
、出力の位相に対して反転と非反転の関係にある入力端
子を備え、出力が、前記ディエンファシス回路の入力端
子に供給される差動増幅器と、低周波帯域の利得に対し
中間周波帯域の利得が低く高周波帯域の利得は中間周波
帯域よりも高く設定された周波数特性を有し、出力が前
記差動増幅器の反転入力端子に供給される周波数フィル
タ回路と、前記エンファシス回路の出力が供給される第
１の入力端子と、前記差動増幅器の出力が供給される第
２の入力端子を備え、記録時には第１の入力を、再生時
には第２の入力を、前記周波数フィルタ回路の入力端子
に伝達するスイッチ回路とを具備し、記録時は映像信号
を、前記エンファシス回路の入力端子に入力して、前記
周波数フィルタの出力端子より取り出し、再生時は映像
信号を、前記差動増幅器の非反転入力端子より入力して
、前記ディエンファシス回路の出力端子より取り出し、
記録時と再生時の伝達特性が相補的関係となることを特
徴とする映像信号の記録再生装置。An emphasis circuit has a transfer characteristic that emphasizes the amplitude of a signal in a high frequency band the weaker the input is when recording a video signal, and a de-emphasis circuit has a transfer characteristic complementary to the emphasis circuit when reproducing a video signal. a differential amplifier comprising an input terminal having an inverting and non-inverting relationship with respect to the phase of the output, the output of which is supplied to the input terminal of the de-emphasis circuit; A frequency filter circuit has a frequency characteristic in which the band gain is low and the gain of the high frequency band is set higher than that of the intermediate frequency band, and the output of the frequency filter circuit is supplied to the inverting input terminal of the differential amplifier, and the output of the emphasis circuit is a first input terminal to which the output of the differential amplifier is supplied, and a second input terminal to which the output of the differential amplifier is supplied; When recording, the video signal is input to the input terminal of the emphasis circuit and taken out from the output terminal of the frequency filter, and during playback, the video signal is transmitted to the input terminal of the differential amplifier. input from the non-inverting input terminal and take out from the output terminal of the de-emphasis circuit,
A video signal recording and reproducing device characterized in that transfer characteristics during recording and reproduction have a complementary relationship.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1159709A JPH0326183A (en) | 1989-06-23 | 1989-06-23 | Recording and reproducing device for video signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1159709A JPH0326183A (en) | 1989-06-23 | 1989-06-23 | Recording and reproducing device for video signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0326183A true JPH0326183A (en) | 1991-02-04 |
Family
ID=15699579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1159709A Pending JPH0326183A (en) | 1989-06-23 | 1989-06-23 | Recording and reproducing device for video signal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0326183A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57123511A (en) * | 1981-01-20 | 1982-08-02 | Matsushita Electric Ind Co Ltd | Recording and reproducing device for video signal |
| JPS62222791A (en) * | 1987-02-16 | 1987-09-30 | Victor Co Of Japan Ltd | Reproducing device for carrier chrominance signal |
-
1989
- 1989-06-23 JP JP1159709A patent/JPH0326183A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57123511A (en) * | 1981-01-20 | 1982-08-02 | Matsushita Electric Ind Co Ltd | Recording and reproducing device for video signal |
| JPS62222791A (en) * | 1987-02-16 | 1987-09-30 | Victor Co Of Japan Ltd | Reproducing device for carrier chrominance signal |
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