JPH0481277B2 - - Google Patents
Info
- Publication number
- JPH0481277B2 JPH0481277B2 JP58106451A JP10645183A JPH0481277B2 JP H0481277 B2 JPH0481277 B2 JP H0481277B2 JP 58106451 A JP58106451 A JP 58106451A JP 10645183 A JP10645183 A JP 10645183A JP H0481277 B2 JPH0481277 B2 JP H0481277B2
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- signal
- audio signal
- band
- recording
- 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.)
- Expired - Lifetime
Links
- 230000005236 sound signal Effects 0.000 claims description 38
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000002040 relaxant effect Effects 0.000 description 1
Landscapes
- Television Signal Processing For Recording (AREA)
- Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
Description
【発明の詳細な説明】
（技術分野）
本発明は周波数変調された映像信号と周波数変
調された音声信号とを多重して記録する様な映像
音声記録装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a video and audio recording device that multiplexes and records a frequency-modulated video signal and a frequency-modulated audio signal.
（従来技術）
一般に音声信号を周波数変調して周波数変調さ
れた映像信号と周波数多重して記録する場合、一
方の信号の帯域から他方の信号の帯域への干渉を
さけるため、各々帯域制限を受けたのちに混合さ
れ、記録媒体に記録されてきた。そして、この場
合において音声信号が入力されていない場合、す
なわち、周波数変調音声信号の帯域にはその成分
が存在せず、周波数変調映像信号が妨害を起すこ
とがない状況にあつても、音声信号がある場合と
同様に帯域制限していたために映像信号は、より
広い帯域を利用できる状態であるにもかかわら
ず、帯域制限を受けた狭い帯域を利用するにとど
まり、映像信号における必要以上の帯域制限によ
る画質、解像度等の劣化が放置され、画質向上が
計られないという問題があつた。(Prior art) Generally, when frequency-modulating an audio signal and frequency-multiplexing it with a frequency-modulated video signal for recording, each signal is subject to band restrictions in order to avoid interference from the band of one signal to the band of the other signal. They were later mixed and recorded on recording media. In this case, even if no audio signal is input, that is, the component does not exist in the band of the frequency modulated audio signal, and the frequency modulated video signal does not cause interference, the audio signal Even though a wider band is available for the video signal, the video signal only uses the narrow band that is band-limited, and the video signal uses more bandwidth than necessary. There was a problem in that the image quality, resolution, etc. deteriorated due to the limitations, and no improvements were made to the image quality.
（目的）
本発明は斯かる事情に鑑み、周波数変調映像信
号と周波数変調音声信号の多重記録における音声
非記録時の記録映像の画質の向上を目的とするも
のである。(Objective) In view of the above circumstances, it is an object of the present invention to improve the image quality of recorded video when no audio is recorded in multiple recording of a frequency modulated video signal and a frequency modulated audio signal.
（実施例）
以下本発明の一実施例を図面に従つて説明す
る。(Example) An example of the present invention will be described below with reference to the drawings.
第１図を参照するに、同図において、１は入力
映像信号を輝度信号成分と色信号成分とに分離し
たのちの輝度信号についてエンフアシス、クリツ
プ等の処理を行ない、周波数変調を施す輝度信号
周波数変調記録処理回路、１′は色信号について
記録のための低域変換等の処理を施す色信号記録
処理回路、２は輝度信号周波数変調記録処理回路
１に接続され、スイツチ１０に連動してハイパス
フイルタ３，４への接続を切換えるスイツチであ
る。ここでハイパスフイルタ３は第２図ａに示す
様な特性を有し、他方、ハイパスフイルタ４は第
２図ｂに示す様な特性を有していて何れも処理回
路１よりの信号に帯域制限をかけるものである。
５は低域変換色信号と周波数変調信号と更に周波
数変調音声信号とを混合する混合回路６に接続さ
れ、スイツチ２と同様にスイツチ１０に連動して
ハイパスフイルタ３，４からの出力を混合回路６
に対して切換えるスイツチ、７は混合回路６から
の信号をビデオヘツド８を介して磁気テープ９上
に記録するための電流増幅用の記録増幅器であ
る。１０は音声信号を映像信号と周波数多重して
記録するか固定ヘツド１５によつてリニア記録す
るかを選択するための切換えスイツチ、１１はス
イツチ１０に接続され音声信号に対して種々の処
理を行ない、周波数変調を施す音声信号周波数変
調記録処理回路、１２は処理回路１１によつて周
波数変調された音声信号に帯域制限をかけるため
の、第２図ｃに示す様な特性を有するバンドパス
フイルタ、１３はスイツチ１０に接続され、音声
信号を音声信号用固定ヘツド１６を介してリニア
記録するための音声信号リニア記録処理回路、１
４はリニア記録のための記録増幅器、１５は音声
信号リニア記録用バイアス発振回路である。 Referring to Figure 1, in the same figure, 1 is a luminance signal frequency that performs processing such as emphasis and clipping on the luminance signal after separating the input video signal into a luminance signal component and a color signal component, and performs frequency modulation. A modulation recording processing circuit, 1' is a color signal recording processing circuit that performs processing such as low frequency conversion for recording on color signals, and 2 is connected to the luminance signal frequency modulation recording processing circuit 1, and is connected to a high pass in conjunction with a switch 10. This is a switch that changes the connection to the filters 3 and 4. Here, the high-pass filter 3 has characteristics as shown in FIG. 2a, and the high-pass filter 4 has characteristics as shown in FIG. It is something that multiplies.
5 is connected to a mixing circuit 6 which mixes the low frequency conversion color signal, the frequency modulation signal, and the frequency modulation audio signal, and similarly to the switch 2, the output from the high pass filters 3 and 4 is connected to the mixing circuit 6 in conjunction with the switch 10. 6
7 is a recording amplifier for current amplification for recording the signal from the mixing circuit 6 on the magnetic tape 9 via the video head 8. 10 is a changeover switch for selecting whether to record the audio signal by frequency multiplexing it with the video signal or linearly record it using the fixed head 15; 11 is connected to the switch 10 and performs various processing on the audio signal. , an audio signal frequency modulation recording processing circuit that performs frequency modulation; 12 is a bandpass filter having characteristics as shown in FIG. 2c for band-limiting the audio signal frequency modulated by the processing circuit 11; 13 is an audio signal linear recording processing circuit connected to the switch 10 and for linearly recording the audio signal via the audio signal fixed head 16;
4 is a recording amplifier for linear recording, and 15 is a bias oscillation circuit for audio signal linear recording.
今、映像信号と音声信号とを周波数多重して記
録する場合においては、スイツチ１０は端子ｅ側
に接続され、スイツチ２は端子ａ側、スイツチ５
は端子ｃ側に接続された状態になる。したがつ
て、輝度信号は輝度信号周波数変調記録処理回路
１にて周波数変調を受けたのちハイパスフイルタ
３に入力される。このハイパスフイルタ３の特性
は通常第２図ｃに示す様な特性の帯域制限を受け
た周波数変調音声信号との干渉を考慮された第２
図ａに示す様な特性となつており、これによつて
周波数変調輝度信号の下側波帯は帯域制限f1を受
け、スイツチ５を介して処理回路１′からの色信
号と共に混合回路６に入力される。一方、音声信
号はスイツチ１０を介して音声信号周波数変調記
録処理回路１１で周波数変調を受けたのちバンド
パスフイルタ１２に入力される。このバンドパス
フイルタ１２の特性は、通常、下側のハイパス部
においては、低域変換された色信号成分との干渉
を、また、上側のロウパス部については周波数変
調輝度信号の下側帯域との干渉を考慮された第２
図ｃに示す様な特性となつており、これによつて
周波数変調音声信号は帯域制限（f3−Δf〜f3＋
Δf）され混合回路６に入力される。そして混合
回路６によつて混合された低域変換色信号、周波
数変調輝度信号及び周波数変調音声信号は記録増
幅器７によつて電流増幅されビデオヘツド８によ
つて磁気テープ９に記録される。したがつて映像
信号は音声信号との干渉がない状態で記録される
が、画質の低下を伴つたものとなる。 Now, when recording video signals and audio signals by frequency multiplexing, switch 10 is connected to the terminal e side, switch 2 is connected to the terminal a side, and switch 5 is connected to the terminal a side.
is connected to the terminal c side. Therefore, the luminance signal is subjected to frequency modulation in the luminance signal frequency modulation recording processing circuit 1 and then input to the high-pass filter 3. The characteristics of this high-pass filter 3 are usually the same as those shown in FIG.
As a result, the lower sideband of the frequency-modulated luminance signal is band-limited f1 , and is sent to the mixing circuit 6 together with the color signal from the processing circuit 1' via the switch 5. is input. On the other hand, the audio signal is subjected to frequency modulation in an audio signal frequency modulation recording processing circuit 11 via a switch 10, and is then input to a bandpass filter 12. The characteristics of this bandpass filter 12 are such that the lower high-pass section normally prevents interference with the low-band converted color signal component, and the upper low-pass section prevents interference with the lower band of the frequency modulated luminance signal. The second one takes interference into account.
The characteristics are as shown in Figure c, and due to this, the frequency modulated audio signal is band limited (f 3 - Δf ~ f 3 +
Δf) and input to the mixing circuit 6. The low frequency converted color signal, frequency modulated luminance signal and frequency modulated audio signal mixed by the mixing circuit 6 are current amplified by a recording amplifier 7 and recorded on a magnetic tape 9 by a video head 8. Therefore, although the video signal is recorded without interference with the audio signal, the image quality is degraded.
次に、音声信号をリニア記録する場合すなわ
ち、音声信号を周波数多重して記録しない場合に
おいては、スイツチ１０は端子ｆ側に接続され
る。それに連動してスイツチ２は端子ａ側から側
へ、また、スイツチ５は端子ｃ側からｄ側へと接
続が切換えられる。それによつて輝度信号は輝度
信号周波数変調処理回路１で周波数変調を受けた
のちはハイパスフイルタ４に入力される。このハ
イパスフイルタ４の特性は周波数変調音声信号と
の干渉を考慮する必要がないので第２図ｂの特性
のようにａの特性よりもさらに下側に伸ばした
（f1→f2）ハイパスとなつている。すなわち、よ
り広帯域の記録が可能となり、これにより前者よ
りも高画質記録が可能となる。ただしハイパスと
なつているのは低域変換された色信号との干渉を
防ぐために考慮されたものである。そして、低域
変換色信号及び周波数変調輝度信号は混合回路６
に入るが、音声信号はないのでそのまま記録増幅
器７によつて電流増幅されビデオヘツド８によつ
て磁気テープ９に記録される。一方、音声信号は
スイツチ１０を介して音声信号リニア記録処理回
路１３に入力し、更に記録増幅器１４でバイアス
発振回路１５からのバイアス出力と重畳されて固
定ヘツド１６によつて磁気テープ９のリニア記録
トラツクに記録される。したがつて前者に比べる
と映像信号の解像度等の性能の向上が計られるこ
とになる。 Next, when the audio signal is linearly recorded, that is, when the audio signal is not frequency-multiplexed and recorded, the switch 10 is connected to the terminal f side. In conjunction with this, the connection of the switch 2 is switched from the terminal a side to the terminal a side, and the switch 5 is switched from the terminal c side to the terminal d side. Thereby, the luminance signal is subjected to frequency modulation in the luminance signal frequency modulation processing circuit 1 and then input to the high pass filter 4. The characteristics of this high-pass filter 4 do not require consideration of interference with the frequency-modulated audio signal, so the characteristics of this high-pass filter 4 are extended further downwards than the characteristics of a (f 1 → f 2 ), as shown in FIG. 2b. It's summery. In other words, it becomes possible to record in a wider band, and thereby to record in higher quality than the former. However, the reason for the high pass is to prevent interference with low frequency converted color signals. The low frequency conversion color signal and the frequency modulation luminance signal are sent to a mixing circuit 6.
However, since there is no audio signal, the current is amplified by the recording amplifier 7 and recorded on the magnetic tape 9 by the video head 8. On the other hand, the audio signal is input to the audio signal linear recording processing circuit 13 via the switch 10, and is further superimposed with the bias output from the bias oscillation circuit 15 in the recording amplifier 14, and linearly recorded on the magnetic tape 9 by the fixed head 16. recorded on the track. Therefore, compared to the former, performance such as resolution of the video signal can be improved.
尚、実施例では特性の異なるハイパスフイルタ
３，４をスイツチ２，５により選択する様にして
いるが、この外に制限帯域（通過帯域）可変フイ
ルタを用いてその制限帯域を音声信号の記録、非
記録に応じて変化させる等、他の適宜の制限帯域
可変手段を用い得るものであることは言う迄もな
いことである。 In the embodiment, the high-pass filters 3 and 4 having different characteristics are selected by the switches 2 and 5, but in addition to this, a variable limited band (pass band) filter is used and the limited band is used for recording audio signals, It goes without saying that other suitable means for varying the limited band, such as changing it depending on non-recording, can be used.
（効果）
以上述べてきたように、本発明によれば、周波
数変調映像信号と周波数音声信号とを多重して記
録する装置において、音声信号が無入力のときに
は、それに応じて周波数変調映像信号の制限帯域
を変化させて帯域制限を緩和させ記録することに
よつて、通常の記録時よりも解像度等の画質の向
上が計れるという効果がある。(Effects) As described above, according to the present invention, in a device that multiplexes and records a frequency modulated video signal and a frequency audio signal, when no audio signal is input, the frequency modulated video signal is By changing the limited band and recording while relaxing the band limit, there is an effect that image quality such as resolution can be improved compared to normal recording.
第１図は本発明の一実施例の、特に本発明に関
係する主要回路系の構成を示すブロツク図、第２
図は第１図示回路系中のフイルタの特性を示す図
である。
１……輝度信号周波数変調記録処理回路、１′
……色信号（低域変換）記録処理回路、１１……
音声信号周波数変調記録処理回路、６……混合回
路、７……記録増幅器、８……ビデオヘツド、９
……磁気テープ、２−５……周波数変調映像信号
制限帯域可変手段の構成要素。
FIG. 1 is a block diagram of one embodiment of the present invention, particularly showing the configuration of the main circuit system related to the present invention, and FIG.
The figure is a diagram showing the characteristics of the filter in the first illustrated circuit system. 1... Luminance signal frequency modulation recording processing circuit, 1'
...Color signal (low frequency conversion) recording processing circuit, 11...
Audio signal frequency modulation recording processing circuit, 6... Mixing circuit, 7... Recording amplifier, 8... Video head, 9
. . . Magnetic tape, 2-5 . . . Components of frequency modulation video signal limited band variable means.
Claims (1)
るとともに、周波数変調された音声信号を周波数
多重して記録媒体上に記録する映像音声記録装置
であつて、 輝度信号を周波数変調する輝度信号周波数変調
手段と、 周波数変調された輝度信号の帯域を制限する輝
度信号帯域制限手段と、 音声信号を周波数変調する音声信号周波数変調
手段と、 前記輝度信号帯域制限手段によつて帯域制限さ
れた輝度信号に色信号を混合するとともに、前記
音声信号周波数変調手段によつて周波数変調され
た音声信号を前記輝度信号の帯域に近接する位置
に周波数多重して記録する記録手段と、 前記輝度信号の帯域に近接して記録される前記
音声信号の記録状態に応じて前記輝度信号帯域手
段を制御し、前記前記輝度信号の制限帯域を変化
させる制御手段と、 を備えてなる映像音声記録装置。[Claims] 1. A video and audio recording device that mixes a color signal with a frequency-modulated luminance signal and frequency-multiplexes a frequency-modulated audio signal and records the frequency-modulated audio signal on a recording medium, the device comprising: a luminance signal frequency modulation means for modulating the frequency of the luminance signal; a luminance signal band limitation means for limiting the frequency band of the frequency-modulated luminance signal; an audio signal frequency modulation means for frequency modulating the audio signal; recording means for mixing a color signal with the limited luminance signal and frequency-multiplexing and recording an audio signal frequency-modulated by the audio signal frequency modulation means at a position close to the band of the luminance signal; a control means for controlling the luminance signal band means according to the recording state of the audio signal recorded close to the luminance signal band, and changing the limited band of the luminance signal; Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58106451A JPS59231706A (en) | 1983-06-14 | 1983-06-14 | Video sound recorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58106451A JPS59231706A (en) | 1983-06-14 | 1983-06-14 | Video sound recorder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59231706A JPS59231706A (en) | 1984-12-26 |
| JPH0481277B2 true JPH0481277B2 (en) | 1992-12-22 |
Family
ID=14433965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58106451A Granted JPS59231706A (en) | 1983-06-14 | 1983-06-14 | Video sound recorder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59231706A (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5955691A (en) * | 1982-09-25 | 1984-03-30 | Sony Corp | Recording device of video and sound signals |
-
1983
- 1983-06-14 JP JP58106451A patent/JPS59231706A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59231706A (en) | 1984-12-26 |
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