JPS5937794A - Video and sound multiplex recording device - Google Patents

Video and sound multiplex recording device

Info

Publication number
JPS5937794A
JPS5937794A JP57147606A JP14760682A JPS5937794A JP S5937794 A JPS5937794 A JP S5937794A JP 57147606 A JP57147606 A JP 57147606A JP 14760682 A JP14760682 A JP 14760682A JP S5937794 A JPS5937794 A JP S5937794A
Authority
JP
Japan
Prior art keywords
signal
recording
frequency
audio
video
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.)
Pending
Application number
JP57147606A
Other languages
Japanese (ja)
Inventor
Yoshizumi Wataya
綿谷 由純
Shigeyuki Ito
滋行 伊藤
Hitoaki Owashi
仁朗 尾鷲
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP57147606A priority Critical patent/JPS5937794A/en
Publication of JPS5937794A publication Critical patent/JPS5937794A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/76Television signal recording
    • H04N5/91Television signal processing therefor
    • H04N5/92Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Signal Processing For Recording (AREA)
  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)

Abstract

PURPOSE:To record and reproduce an audio signal of high quality free of adjacent disturbance noise by recording a signal on all tracks by one modulator in the mode of wide video track width and recording signals, track by track, by two modulators in narrow-width mode. CONSTITUTION:An HPF20 having a low cutoff frequency is provided in parallel to an HPF6 and switching circuits 21 and 23 are provided. The switching circuits 21 and 23 are changed over to side A in the mode where the video track width W is wide, and the output of the HPF20 and the output signal of an FM modulator 13 are recorded on a magnetic tape by recording heads 17 and 18. On the other hand, the circuits 21 and 23 are changed over to side B in the mode where the video track width W is narrow; the output of the HPF6 and the output signal of a modulator 13 are recorded by the head 17 and the output of the HPF6 and the output signal of an FM modulator 14 are recorded by the head 18. Consequently, when the video track width is narrow, the record and the reproduction of the audio signal of high quality free of adjacent disturbance noise are performed.

Description

【発明の詳細な説明】 本発明は周波数変!i14 (FM変調)音声信号と映
像信号とを周波数多重して記録する磁気記録再生装置に
おける隣接記録トラックからのクロストークに基づく雑
音を低減する音声信号記録再生装置に関するものである
[Detailed Description of the Invention] The present invention features frequency variation! i14 (FM modulation) This relates to an audio signal recording and reproducing device that reduces noise due to crosstalk from adjacent recording tracks in a magnetic recording and reproducing device that records audio signals and video signals by frequency multiplexing.

近年の記録密度向上は目覚ましいものがあり、約十年前
のVTRに比べて17倍もの高密度記録を達成している
。そして、このような高密度記録技術の進歩にともない
、カセットの小型化や回転シリンダ径の小型化などによ
υ、コンパクト化を計ったVTRが開発され始めている
。これら小[VTIt、では、小型、軽量化や磁気テー
プ走行速度の低速度化等のだめ、今までの同定ヘッドを
用いる音声信号録再方式では、ワウ、フラッタ特性、再
生S/Nや再生周波数帯域等の点で十分な性能を得る事
が困難となってきている。
The increase in recording density in recent years has been remarkable, achieving a recording density 17 times higher than that of VTRs from about 10 years ago. With the progress of such high-density recording technology, VTRs that are more compact have begun to be developed by making the cassette smaller and the diameter of the rotating cylinder smaller. In these small [VTIt], in order to reduce size, weight, and slow magnetic tape running speed, conventional audio signal recording and reproducing systems using identification heads have been unable to improve wow, flutter characteristics, playback S/N, playback frequency band, etc. It has become difficult to obtain sufficient performance due to these reasons.

このような問題点を解決する手段の一つとしてFM変調
した音声信号と映像信号とを周波数多重して回転ヘッド
にて磁気テープ上に記録する方法(以下、音声FM多重
方式という)が知られている。
As one means of solving these problems, a method is known in which FM-modulated audio signals and video signals are frequency multiplexed and recorded on a magnetic tape using a rotating head (hereinafter referred to as audio FM multiplexing method). ing.

音声1” M多重方式の特徴としては、(1)  テー
プ走行速度むらKよる時間軸変動の影響を受けにくいの
でワウ、フラッタ特性が良い。
The characteristics of the audio 1'' M multiplex system are as follows: (1) It is less susceptible to time axis fluctuations due to tape running speed unevenness K, so it has good wow and flutter characteristics.

(2)再生周波数帯域がテープ走行速度に依存しておら
ず、広帯域化が可能である。
(2) The reproduction frequency band does not depend on the tape running speed, and a wide band is possible.

などがあげられる。etc.

ここで、上述した音声信号を音声1”M多重方式にて記
録再生するV’I’R,の記録周波数スペクトラムにつ
いて考えてみる。
Here, let us consider the recording frequency spectrum of V'I'R, which records and reproduces the above-mentioned audio signal using the audio 1''M multiplexing method.

音声信号搬送波の中心周波数は、輝度信号及び色度信号
に与える影響が最小になるように決めなくてはならない
。また、小型VTR,特に回転シリンダ径の小さいVT
ILでは、テープとヘツードの相対速度が低くなるため
記口周波数帯域が狭く、輝度信号搬送波の中心周波数を
あまり高く設定できない。そこで、音声信号搬送波の中
心周波数は、Li’M変調輝度信号の下側で、できるだ
け低い周波数とせざるをえない。
The center frequency of the audio signal carrier must be determined so as to minimize its influence on the luminance and chromaticity signals. Also, small VTRs, especially VTs with small rotating cylinder diameters,
In IL, the recording frequency band is narrow because the relative speed between the tape and the tape is low, and the center frequency of the luminance signal carrier wave cannot be set very high. Therefore, the center frequency of the audio signal carrier must be as low as possible below the Li'M modulated luminance signal.

第1図および第2図に映像信号とFM音声信号との記録
時の周波数スペクトラムの一例を示す。第1図は、FM
変調輝度信号Yと周波数変換色度信号Cの間にFM変調
音声信4Aを配した一例、第2図は周波数変換色度信号
(:の下側にI“M変調音声信号Aを配した一列である
。しかしながら、記録時のテープ速度とxf:cるテー
プ速度にて再生する、いわゆる可変速再生を行なうため
やトラッキング余裕度を得るためビデオトラック幅に対
してヘッド幅を広くとる必要性、及びトラッキングずれ
等によって隣接ビデオトラックの信号をも再生すると、
再生音声信号中に該隣接ビデオトラックのFM音声信号
の影響(以下、隣接妨害と言う。)のため、雑音が生じ
大変耳障シである。特に、高記録密度化を計る場合、ビ
デオトラック幅が狭くなるため、トラッキングずれ等の
隣接妨害が音声1”M多重方式では問題となってくる。
FIGS. 1 and 2 show examples of frequency spectra when recording video signals and FM audio signals. Figure 1 shows FM
An example of placing the FM modulated audio signal 4A between the modulated luminance signal Y and the frequency-converted chromaticity signal C, FIG. However, in order to perform so-called variable speed playback, in which the tape speed is played back at a tape speed that is xf:c compared to the tape speed during recording, and to obtain tracking margin, it is necessary to make the head width wider than the video track width. And if the signal of the adjacent video track is also played back due to tracking deviation, etc.
Due to the influence of the FM audio signal of the adjacent video track (hereinafter referred to as "adjacent interference") in the reproduced audio signal, noise is generated, which is very annoying to the ears. In particular, when attempting to increase the recording density, the video track width becomes narrower, so adjacent interference such as tracking deviation becomes a problem in the audio 1''M multiplexing system.

第3図は磁気テープに形成されるビデオトラックT1、
′■゛2と、ビデオへッドトIの位置を模式的に示す平
面図である。
FIG. 3 shows a video track T1 formed on a magnetic tape.
FIG. 2 is a plan view schematically showing the positions of the video head 1 and the video head I.

ここで、上記隣接妨害によシ生ずる雑音N (t)は、
第3図に示すごとくトラッキングがずれた場合、ビデオ
ヘッド■1がトレースしようとしているビデオトラック
T1から得られる第1のl”M11信号(第3図りの部
分よυ得られる信号で、以下、希望FM音声信号という
。)のレベルをa隣接ビデオトラック′■゛2から得ら
れる第2の1”M音声信号(第3図Uの部分よシ得られ
る信号で以下、妨害FM音声信号という。)のレベルを
hとし、希望FM音声信号と妨害1”M音声信号との差
周波数を△0)とすると、 皇\(Z)−一Δω(eelΔωt)・・・・・・・・
・・・・(1)と表わされる。ここでtけ時間を表わす
。すなわち、隣接妨害雑音N(1)は、希望FM音声信
号と妨害L”M音声信号との差周波数(ビート周波数)
△ωの正弦波として出力され、その振幅は隣接1”M音
声信号と希望FM音声信号との振幅比h/aとその差周
波数△ωとに比例するものと考えられる。そこで、上述
のVTJこおける隣接妨害を軽減するため、幾つかの方
法が考えられており、その1つの方法として1本のビデ
オトラックを描く1走j「毎にヘッドギャップの傾き(
アジマス角度ψ)の異なる回転ヘッドによυ映像信号を
記録し、アジマス損失を利用してガートバンド及び隣接
妨害雑音をなくす方法(アジマス記録方式)がある。こ
こで、アジマス損失Lαは、テープ上のビデオトラック
幅〜v1 アジマス角度ψ、記録波長λとすると πW と表わせる。ここでは、πは円周率を表わす。
Here, the noise N (t) caused by the adjacent interference is:
When the tracking deviates as shown in Figure 3, the first l''M11 signal obtained from the video track T1 that the video head 1 is trying to trace (the signal obtained from the part in the third diagram, hereinafter referred to as The level of the second 1"M audio signal (hereinafter referred to as the interfering FM audio signal, which is obtained from the part U in FIG. 3) obtained from the adjacent video track '2' (hereinafter referred to as the interfering FM audio signal) is the level of the FM audio signal. If the level of is h and the difference frequency between the desired FM audio signal and the interfering 1"M audio signal is △0), then
...It is expressed as (1). Here, t represents time. That is, the adjacent interference noise N(1) is the difference frequency (beat frequency) between the desired FM audio signal and the interfering L''M audio signal.
It is output as a sine wave of Δω, and its amplitude is considered to be proportional to the amplitude ratio h/a of the adjacent 1"M audio signal and the desired FM audio signal and the difference frequency Δω. Therefore, the above-mentioned VTJ Several methods have been considered to reduce the adjacent interference caused by the head gap.One method is to reduce the slope of the head gap (
There is a method (azimuth recording method) in which υ video signals are recorded by rotating heads with different azimuth angles ψ) and azimuth loss is used to eliminate guard band and adjacent interference noise. Here, the azimuth loss Lα can be expressed as πW, where the video track width on the tape is ~v1, the azimuth angle ψ, and the recording wavelength λ. Here, π represents pi.

したがって、このアジマス記録方式では、記録波長が短
くなるほど、また、ビデオトラック幅が大きいelどそ
してアジマス角度ψを大きくするほど、アジマス損失L
aが大きくなυ隣接妨害を幅減で籾る。
Therefore, in this azimuth recording method, the shorter the recording wavelength, the larger the video track width el, and the larger the azimuth angle ψ, the more the azimuth loss L
υ adjacent disturbances with large a are reduced in width.

ところが、回転ヘッドドラムが映像信号の記録周波数と
記録波長の点からある限度以下の径にできず、またアジ
マス角度ψを犬なくするとトラッキングがずれた場合に
再生トラック切換時点にて発生するスキュー歪が大きく
なることと再生ヘッド出力レベルがCnt (ψ/2)
倍となりCしまうことなどの点からアジマス角度ψを大
きくするととけ困樵である。しだがって、隣接妨害雑音
N(−)を一定レベル以下に抑えるにはビデオトラック
幅Wを大きくせざるを得ない。しかしながら、ビデオト
ラック幅Wを大きくすることは記録密度を低下させるこ
とになるため、長時間録画が困難になる。
However, if the diameter of the rotating head drum cannot be made below a certain limit in terms of the recording frequency and recording wavelength of the video signal, and if the azimuth angle ψ is eliminated, the skew distortion that occurs at the time of switching the playback track will occur if the tracking deviates. becomes larger and the playback head output level becomes Cnt (ψ/2)
If the azimuth angle ψ is increased, it will be difficult to solve the problem because it will double and become C. Therefore, in order to suppress the adjacent interference noise N(-) below a certain level, the video track width W must be increased. However, increasing the video track width W lowers the recording density, making long-term recording difficult.

このような隣接妨害雑音の問題を根本的に解決する手段
としては、記録トラックごとにFM音声信号の搬送周波
数を異ならせる方法がある。
One way to fundamentally solve the problem of adjacent interference noise is to vary the carrier frequency of the FM audio signal for each recording track.

第4図に上記方法による音声FM多重方式の回路構成例
を示す。入力端子1より入力された映像信号は低域通過
ろ波器(LPF ) 2および帯域通過ろ波器(DPF
)5にて輝度信号と色度信号に分離される。LPF2に
て分離抽出された輝度信号はエンファシス回路4を通し
てFM変調器5に変調信号として加えられ、変調された
信号は高域通過ろ波器6にて帯域制限された後に加算器
7および8に加えられる。まだBPF’5にて分離抽出
された色度信号は周波数変換器9にて低域に同波数変換
され、LPF 1oにて不要帯域外成分を除去された後
に加算器7および8に加えられる。
FIG. 4 shows an example of a circuit configuration of an audio FM multiplexing system according to the above method. The video signal input from input terminal 1 is passed through low pass filter (LPF) 2 and band pass filter (DPF).
) 5, the signal is separated into a luminance signal and a chromaticity signal. The luminance signal separated and extracted by the LPF 2 is applied as a modulation signal to the FM modulator 5 through the emphasis circuit 4, and the modulated signal is band-limited by the high-pass filter 6 and then sent to the adders 7 and 8. Added. The chromaticity signal that has been separated and extracted by the BPF'5 is subjected to same-wavenumber conversion to a lower frequency band by the frequency converter 9, unnecessary out-of-band components are removed by the LPF 1o, and then added to the adders 7 and 8.

エンファシス回路12を通してFM変調器13および1
4に変調信号として加えられ、FM変調器13の出力は
加算器7に、FM変調器14の出力は加算器8にそれぞ
れ加えられ木。FM変調器15および14の中心周波数
f1およびf2はそれぞれ帯域が重ならないように選ば
れ、加算器7および8の出力信−号スペクトラムはそれ
ぞれ第5図(、)i−よび(A)に示すようKなる。
FM modulators 13 and 1 through emphasis circuit 12
The output of the FM modulator 13 is added to the adder 7, and the output of the FM modulator 14 is added to the adder 8 as a modulation signal. The center frequencies f1 and f2 of the FM modulators 15 and 14 are respectively selected so that their bands do not overlap, and the output signal spectra of the adders 7 and 8 are shown in FIGS. 5(,)i and (A), respectively. It's like K.

図中、A1、A1はそれぞれFM変調器16.14の出
力信号の1゛M変調音声信号である。加算器7の出力信
号は記録アンプ15を介して記録ヘッド17にて磁気テ
ープ19上に記録され、加算器8の出力信号は記録アン
プ16を介して記録ヘッド18′にて同じく磁気テープ
19上に記録される。記録ヘッドド)よび18による記
録は各記録トラックごとに交互に行われる。したがって
磁気テープ19上の記録跡は第6図に示すようになシ、
音声FM信号に注目してみると、記録ヘッド17で記録
されたトラックT1すなわちIi’M変調器13の出接
には記録ヘッド18で記録されたトラック1゛2すなわ
ち1゛M変調器14の出力信号(周波数、lりが記録さ
れたトラックが位置することになる。
In the figure, A1 and A1 are respectively 1mm modulated audio signals of the output signals of the FM modulators 16 and 14. The output signal of the adder 7 is recorded on the magnetic tape 19 by the recording head 17 via the recording amplifier 15, and the output signal of the adder 8 is recorded on the magnetic tape 19 by the recording head 18' via the recording amplifier 16. recorded in Recording by the recording heads (1) and 18 is performed alternately for each recording track. Therefore, the recording traces on the magnetic tape 19 are as shown in FIG.
Paying attention to the audio FM signal, track T1 recorded by the recording head 17, that is, the output and output of the Ii'M modulator 13, and track 12 recorded by the recording head 18, that is, the 1'M modulator 14, are connected to each other. The track where the output signal (frequency, etc.) is recorded will be located.

このように記録された信号を再生した場合、例えばトラ
ックTIよシ再生された音声FM信号の帯吠内には隣接
トラックTyからの妨害信号は入ってこす、同様にトラ
ックT!より再生された音声FM信号の帯、“減肉には
隣接トラック′1゛1かもの妨害信号は入ってこない。
When a signal recorded in this manner is reproduced, for example, an interfering signal from an adjacent track Ty will enter the band of the audio FM signal reproduced from track TI, and similarly from track T! In the band of the more reproduced audio FM signal, the interfering signals from the adjacent tracks '1'1 do not enter the 'thin area'.

]7たがつ又、上記した様に各トラックごとに音声FM
信号の搬送波中心周波数を異ならせ隣接トラック間では
音声FM信号の帯域が重ならないようにすることによっ
て、隣接トラックからの妨害信号が発生することなく高
品位の音声信号を記録再生可能とすることができる。
]7 Tagatsumata, as mentioned above, audio FM for each track
By differentiating the carrier wave center frequencies of the signals so that the audio FM signal bands do not overlap between adjacent tracks, it is possible to record and reproduce high-quality audio signals without generating interfering signals from adjacent tracks. can.

一方、ビデオトラック@Wが広い場合には隣接妨害雑音
自体が十分小さくなるため、このような方法を採用する
必要がない。しかしながらビデオトラック幅Wが広い場
合と狭い場合の2種類以上の記録再生モードを持つシス
テムにおいては、ビデオトラック幅Wが狭いモードにつ
いては隣接妨害雑音の対策のために第4図に示したよう
な方法を採用せざるを得ないが、ビデオトラック幅Wが
広いモードについては1系統の音声FM変調、記録回路
、第4図でいえばFM変調器14、加算器8、記録アン
プ16が不要であるにもかかわらず備えなければならず
、しかも輝度(Fi号記録帯域を決足する1iPF 6
のカットオフ周波数を2種類の音声FM搬送波の分だけ
高くせざるを得ないために解像度が劣化するという問題
があった。
On the other hand, when the video track @W is wide, the adjacent interference noise itself becomes sufficiently small, so there is no need to employ such a method. However, in a system that has two or more recording and playback modes, one for wide video track widths and the other for narrow video track widths, in the mode where video track width W is narrow, the mode shown in Fig. 4 is used as a countermeasure against adjacent interference noise. However, in a mode where the video track width W is wide, one system of audio FM modulation and recording circuit, FM modulator 14, adder 8, and recording amplifier 16 in FIG. 4, is not necessary. However, it is necessary to prepare for the brightness (1iPF 6, which determines the Fi record band).
There was a problem in that the resolution deteriorated because the cutoff frequency of the audio FM carrier had to be increased by the amount corresponding to the two types of audio FM carrier waves.

本発明の目的は上記した問題点を解決し、ビデオトラッ
ク幅Wが広い場合には回路規模が小さくなるとどもに輝
度信号解像度の劣化もなくビデオトラック幅Wが狭い場
合には隣接妨害雑音の発生もないFM変調音声信号記録
再生装置を提供するにある。
An object of the present invention is to solve the above-mentioned problems, and when the video track width W is wide, there is no deterioration of the luminance signal resolution when the circuit scale is reduced, and when the video track width W is narrow, adjacent interference noise occurs. An object of the present invention is to provide an FM modulated audio signal recording and reproducing device.

本発明においてはビデオトラック幅Wが広いモードにお
いては一つのFM変調器にてすべてのトラックに同一周
波数で音声1!’M信号を記録し、ビデオトラック幅W
が狭いモードにおいては一つの音声信号に対してFM変
調器を2つ設け、トラックごとに記録する音声FM信号
の搬送波周波数を設けることによって、上記問題点を解
決している。
In the present invention, in a mode in which the video track width W is wide, one FM modulator is used to transmit audio 1! to all tracks at the same frequency! 'M signal is recorded, video track width W
In the narrow mode, the above problem is solved by providing two FM modulators for one audio signal and providing a carrier frequency for the audio FM signal recorded for each track.

以下、本発明の一実施例を第7図によシ説明する。第7
図において第4図の回路と同一構成同一動作の回路につ
いては第4図と同一の番号を用いている。映像信号記録
回路については基本的には第4図の回路と同様であり、
異なる部分は輝度信号FM変調器5の出力信号の帯域制
限をするI−IP F 6と並列にHPF 6よシもカ
ットオフ周波数の低いHPF20を設け、切換回路21
にて入力端子22よ多入力される記録再生モード切換信
号によってHPF6またけI(PF 20の出力信号を
加算器7または8に供給することと、同じく記録再生モ
ード切換信号によって切換回路23を切換える点である
。ビデオトラック幅Wが広いモードでは切換回路21お
よび25は図中に示したA側に切換わj)、HPF20
の出力およびFM変調器13の出力信号が記録ヘッド1
7および18によりて磁気テープ19上に記録される。
An embodiment of the present invention will be described below with reference to FIG. 7th
In the figure, the same numbers as in FIG. 4 are used for circuits having the same configuration and the same operation as the circuit in FIG. 4. The video signal recording circuit is basically the same as the circuit shown in Figure 4.
The difference is that an HPF 20 with a lower cutoff frequency than the HPF 6 is provided in parallel with the I-IP F 6 that limits the band of the output signal of the luminance signal FM modulator 5, and a switching circuit 21
The output signal of the HPF 6 straddling I (PF 20) is supplied to the adder 7 or 8 by the recording/reproducing mode switching signal inputted to the input terminal 22 at the input terminal 22, and the switching circuit 23 is also switched by the recording/reproducing mode switching signal. In the mode where the video track width W is wide, the switching circuits 21 and 25 are switched to the A side shown in the figurej), and the HPF 20
The output of the recording head 1 and the output signal of the FM modulator 13 are transmitted to the recording head 1.
7 and 18 on the magnetic tape 19.

逆にビデオトラック幅Wが狭いモードでは切換回路21
および23はB側に切換わυ、HPFsの出力およびF
M変調器13の出力信号が記録ヘッド17によって、ま
た1−11’I’sの出力およびI”M変調器14の出
力信号が記録ヘッド1日によって記録される。
Conversely, in a mode where the video track width W is narrow, the switching circuit 21
and 23 are switched to the B side υ, the output of HPFs and F
The output signal of the M modulator 13 is recorded by the recording head 17, and the output signal of the 1-11'I's and the output signal of the I''M modulator 14 is recorded by the recording head 17.

第8図(a)にビデオトラック幅Wが広いモードでの記
録信号スペクトラムを、第8図(、S)にビデオトラッ
ク幅Wが狭い場合の記録ヘッド17にて記録される信号
のスペクトラムを、WJ8図(c)に同′じくビデオト
ラック幅Wが狭い場合の記録ヘッド1日にて記録される
信号のスペクトラムを示す。第8図(a)よシ明らかな
ように、ビデオトラック幅が広いモードでは、FM変調
器5の出力がカットオフ周波数の比較的低いIIPF2
0を通して記録されるだめに広帯域の輝度信号の記録再
生が可能となる。まだ第8図(A) 、(c)より明ら
かなように1 ビデオトラック幅Wが狭いモードの場合
にeま記録トラックの音声1・゛M信号占有帯域と隣接
トランクに記録された音声1i’M信号占有帯域とが互
に異なっているノこめに、原理的に隣接トラックからの
クロストーク信号が復調音声帯域内に隣接妨害雑刊とし
て現れることがなく、高品位の音声信号の記録再生が可
能になる。なお、1’M変調器13および17Iの出力
信号帯域は完全に分肉Iトせずに多少型なり合う場合に
も同様に高品位の再生が可能である。
FIG. 8(a) shows the recording signal spectrum in a mode where the video track width W is wide, and FIG. 8(S) shows the spectrum of the signal recorded by the recording head 17 when the video track width W is narrow. Similarly, FIG. 8(c) shows the spectrum of the signal recorded by the recording head in one day when the video track width W is narrow. As is clear from FIG. 8(a), in the mode where the video track width is wide, the output of the FM modulator 5 is
By recording through 0, it becomes possible to record and reproduce a wideband luminance signal. As is clear from FIGS. 8(A) and 8(c), when the video track width W is in the narrow mode, the audio 1.mm of the recording track and the audio 1i' recorded on the adjacent trunk Because the M signal occupied bands are different from each other, in principle, crosstalk signals from adjacent tracks do not appear as adjacent interference in the demodulated audio band, and high-quality audio signal recording and playback is possible. It becomes possible. Note that even if the output signal bands of the 1'M modulators 13 and 17I are not completely separated but are somewhat similar in size, high-quality reproduction is possible as well.

一方、再生時においては、磁気テープ19よシ記録ヘッ
ド17にて記録された信号が再生ヘッド24にて再生さ
れ、記録ヘッド18にて記録された48号が再生ヘッド
25にて再生される。再生ヘッド24および25にて再
生された信号は再生アンプ26および27にて増幅され
た後、切換回路28に供給される。切換回路28Vi入
力端子29よシ入力される再生トラック切換信号に応じ
て切換わ多連続した再生信号を作る。切換回路28の出
力信号中よりJ[PF30にてl”M変調輝度信号成分
が分離され、復調器31にて1・゛M復調されディエン
ファシス回路52に°〔ディエンファシスされた後に加
算器33に加えられイ)。また切換回路2日の出力信号
中よυLPF’g4にて分離された1成域変換色度信号
は周波数変換器35にて元の搬送波周波数に戻されBP
F56にて不要帯域成分を除去きれた後、加算器53に
加えられて廊度信号成分と加算され出力端子57より再
生映像信号として出力される。
On the other hand, during reproduction, the signal recorded on the magnetic tape 19 by the recording head 17 is reproduced by the reproduction head 24, and the signal No. 48 recorded by the recording head 18 is reproduced by the reproduction head 25. The signals reproduced by the reproduction heads 24 and 25 are amplified by reproduction amplifiers 26 and 27, and then supplied to a switching circuit 28. The switching circuit 28 is switched in response to a reproduction track switching signal inputted through the Vi input terminal 29 to produce a continuous reproduction signal. From the output signal of the switching circuit 28, the J [l''M modulated luminance signal component is separated by the PF 30, demodulated by the demodulator 31 to 1.゛M, and sent to the de-emphasis circuit 52. Also, among the output signals of the switching circuit 2, the one-component gamut-converted chromaticity signal separated by υLPF'g4 is returned to the original carrier frequency by the frequency converter 35 and converted to BP.
After the unnecessary band components have been removed at F56, the signal is added to the adder 53, added to the corridor signal component, and outputted from the output terminal 57 as a reproduced video signal.

まだ再生アンプ26の出力は切換回路58に供給される
が、切換回路28の出力信号も切換回路3日に供給され
、記録再生モード切換信号に基づいて切換えられてL3
I’ル゛39に供給される。し2だがってビデオトラッ
ク幅Wが広いモードの場合には切換回路28の出力がB
PF39にで分Ii!1tさit復?JFA器40にて
復調された後に切換回路41を介してディエンファシス
回1342にてディエンファシスされ、出力端子43よ
υ再生音声信号として出力される。
The output of the reproducing amplifier 26 is still supplied to the switching circuit 58, but the output signal of the switching circuit 28 is also supplied to the switching circuit 3, and is switched based on the recording/reproducing mode switching signal to L3.
I' loop 39 is supplied. However, in the mode where the video track width W is wide, the output of the switching circuit 28 is B.
Ii in PF39! Is it revenge? After being demodulated by the JFA unit 40, it is de-emphasized by the de-emphasis circuit 1342 via the switching circuit 41, and outputted from the output terminal 43 as a υ reproduced audio signal.

一方、ビデオトラック幅Wが狭いモードの場合には再生
アンプ26の出力が切換回路38を介してBPFJ9に
供給され、再生アンプ27の出力が13PF4aに供給
される。BPF44にて分角[トされたFM変調音声信
号、いいかえれば1・゛M変調器14にて変調、記録さ
れた信号が復調器45にて復調され、切換回路46に供
給される。切換回路46には復調器40の出力信号も供
給されているが、両方の音声信号ともにそれぞれのトラ
ックごとの再生信号であるために不連続であり、再生ト
ラック切換信号に基づいて切換回路46が切換えられて
連続音声信号として出力される。ビデオトラックIIQ
 Wが狭いモードの場合には切換回路46の出力信月は
切換回路41を介してディエンファシス回路42に供給
され、出力端子43より出力される。
On the other hand, in the mode where the video track width W is narrow, the output of the reproduction amplifier 26 is supplied to the BPFJ9 via the switching circuit 38, and the output of the reproduction amplifier 27 is supplied to the 13PF4a. The FM modulated audio signal converted by the BPF 44, in other words, the signal modulated and recorded by the 1.M modulator 14 is demodulated by the demodulator 45 and supplied to the switching circuit 46. The output signal of the demodulator 40 is also supplied to the switching circuit 46, but since both audio signals are reproduced signals for each track, they are discontinuous. It is switched and output as a continuous audio signal. Video track IIQ
When W is in the narrow mode, the signal output from the switching circuit 46 is supplied to the de-emphasis circuit 42 via the switching circuit 41 and output from the output terminal 43.

第7図に示した実施例においてはビデオトラック幅Wの
広いモードと狭いモードとを兼用した装置を示したが、
ビデオトラック幅Wの広いモードだけで記録再生すて)
場合には回路構成は大幅に簡略化される。すなわち、切
換回路21.23.38.41をすべてA側に固定する
(いいかえれば切換回路21.25.58.41が不要
になる)ととも知11PF6、FM変調器14、加算器
8、記録アンプ16、BPF44、復調器45、切換回
路46を削除することができる。したがって、ビデオト
ラック幅Kかかわらず第4図に示した回路構成で音声F
M信号を記録する方式に比べて、本発明においてはビデ
オトラック幅Wが広いモードでは極めて簡単な回路Fi
II成で音声I”M信号の記録再生が可能であるばかり
ではなく記録側の輝度信号帯域を広くすることができる
。さらにビデオトラック幅Wが狭いモードでも隣接妨害
a(を音のない高品位の音声信号の記録再生が可能とな
る。
In the embodiment shown in FIG. 7, a device is shown that has both a wide mode and a narrow mode of video track width W.
Recording and playback only in the wide video track width W mode)
In this case, the circuit configuration is significantly simplified. In other words, the switching circuits 21, 23, 38, 41 are all fixed to the A side (in other words, the switching circuits 21, 25, 58, 41 are not required). The amplifier 16, BPF 44, demodulator 45, and switching circuit 46 can be omitted. Therefore, regardless of the video track width K, the circuit configuration shown in FIG.
Compared to the method of recording M signals, the present invention uses an extremely simple circuit Fi in a mode where the video track width W is wide.
With the II configuration, it is not only possible to record and reproduce audio I''M signals, but also to widen the luminance signal band on the recording side.Furthermore, even in a mode where the video track width W is narrow, adjacent interference It becomes possible to record and play back audio signals.

またビデオ)・ラック幅Wが狭いモードにて輝度信号帯
域を広げるためにはFM変調輝度信号の搬送波周波数を
高域側にシフトすることもできる。
Furthermore, in order to widen the luminance signal band in a mode where the rack width W is narrow (video), the carrier frequency of the FM modulated luminance signal can be shifted to the higher frequency side.

なお、以上の説明は1チヤンネルの音声信号の記録再生
について述べだが、多チャンオルの音声信号を記録再生
する場合についても各チャンネルごとに同様の回路構成
を設ければ本発明の効果が得られるととけいうまでもな
い。まだ音声信号に限らず、他の情報信月を記録する場
合にも、複数の情報あるいけ音声信号などを多重しだ信
号を同一の変調器にて変調する場合などにおいても本発
明は有効である。
Although the above explanation is about recording and reproducing a single channel audio signal, it is believed that the effects of the present invention can be obtained even when recording and reproducing multi-channel audio signals by providing a similar circuit configuration for each channel. Needless to say. The present invention is effective not only when recording audio signals but also when recording other information or when multiplexing multiple pieces of information such as audio signals and modulating them using the same modulator. be.

また、第7図に示した実施例でけIIPF 6とHPF
20とを切換回路21にて切換えるごとく構成されてい
るが、一つのI−I I)Fの定数だけを切換えても同
様の効果が出ることはいうまでもない。
In addition, in the embodiment shown in FIG. 7, IIPF 6 and HPF
20 and 20 are switched by the switching circuit 21, but it goes without saying that the same effect can be obtained even if only one constant of I-I (I)F is switched.

以上述べたごとく、本発明によればビデオトラック幅が
広い場合には簡単な回路構成にて高品位の音声信号およ
び広帯域の映像信号の記録再生が可能であシ、ビデオト
ラック幅が狭い場合にij@接妨害雑盲のない高品位の
音声信号のfle録再半再生TJ能となシ、その効果は
大である。
As described above, according to the present invention, when the video track width is wide, it is possible to record and reproduce high-quality audio signals and wideband video signals with a simple circuit configuration, and when the video track width is narrow, The effect of TJ's ability to record and play half-playback of high-quality audio signals without interference and blindness is great.

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

第1図および第2図は映像音声多重記録信号スペクトラ
ムの例を示すスペクトラム図、第3図はテープパタンの
例を示す平面図、第4図は従来例を示す回路構成図、第
5図は従来例における記録信号スペクトラム図、第6図
は従来例に、b−けるテープパターンの例を示す平面図
、第7図は本発明の一実施例を示す回路構成図、第8図
は本発明の一実施例の記録信号スペクトラム図である。 6.20・・HPF 21.23.58.41・・・切換回路13.1/I・
・・1”M変調器 39.44・・・13 P 1” 40.45・・・FM復調器 22・・・記録再生モード切換信号入力端子2′1  
 口 周液数 才 ZY2U。 才   斗   図 才  δ  図 Y 周液数 胴液駁 同液数
Figures 1 and 2 are spectrum diagrams showing an example of a video/audio multiplex recording signal spectrum, Figure 3 is a plan view showing an example of a tape pattern, Figure 4 is a circuit configuration diagram showing a conventional example, and Figure 5 is a diagram showing an example of a tape pattern. 6 is a plan view showing an example of a tape pattern in the conventional example; FIG. 7 is a circuit configuration diagram showing an embodiment of the present invention; FIG. 8 is a diagram showing an example of the tape pattern of the present invention. FIG. 3 is a recording signal spectrum diagram of an example. 6.20...HPF 21.23.58.41...Switching circuit 13.1/I...
...1"M modulator 39.44...13 P 1" 40.45...FM demodulator 22...recording/reproduction mode switching signal input terminal 2'1
Perioral fluid several years old ZY2U. Saito Zuzai δ Figure Y

Claims (1)

【特許請求の範囲】 1、 映像信号を輝度信号と色度信号に分離し該輝度信
号を変調信号として周波数変調し、該−色度信号を低域
に周波数変換するとともに少くども一つの音声信号を変
調信号として周波数変調するとともに上記周波数変調輝
度信号と低域変換色度信号と周波数変調音声信号とを加
算し同一トラック上に複数個の磁気ヘッドにて相隣接す
るトラックに順次記録するとともに、少なくとも二つの
異なる記録トラック幅の記録フォーマットを持つ映像音
声多重記録装置において、比較的記録トラック幅の広い
記録フォーマットの時は一つのチャンネルの音声信号に
対して単一の変調器を設け、すべての記録トラック上に
同一搬送波中心周波数の周波数変調音声信号を記録する
手段と、比較的記録トラック幅の狭い記録フォーマット
の時には一つのチャンネルの音声信号ごとに少くとも二
つの異なる搬送波中心周波数を持つ複数の変調器を設け
、該複数の変調器出力の周波数変調音声信号を順次記録
トラックごとに切換えて記録する手段とを持つことを特
徴とする映像音声多重記録装置。 2、 比較的記録トラック幅の狭い記録フォーマットの
時には一つのチャンネルの音声信号ごとに少くとも二つ
の異なる搬送波中心周波数を持つ複数の変調器を設け、
該複数の変調器のいずれか一つの変調器の搬送波中心周
波数を、比較的記録トラック幅の広い記録フォーマット
の時の周波数変調音声信号の搬送波中心周波数と等しく
選ぶことを特徴とする特許請求の範囲第1項記載の映像
音声多重記録装置。 3、映像信号を輝度信号と色度信号に分離する回路と、
該分離された輝度信号を変調信号とする周波数変調器と
、該変調器出力中よシネ要低域成分を除去する高域通過
ろ波器を設け、比較的記録トラック幅の広い記録フォー
マツ)の時には前記高域ろ波器の遮断周波数を比較的低
くシ、比較的記録トラック幅の狭い記録フ71−マット
の時には前記高域ろ波器の遮断周波数を比較的高くした
ことを特徴とする特許請求の範囲第1項記載の映像音声
多重記録装置。 4、 比較的記録トラック幅の広い記録フォーマットの
時の周波数変調輝度信号の搬送波周波数に比べて比較的
記録トラック幅の狭い記録フォーマットの時の周波数変
調輝度信号の搬送波周波数を高くしたととを特徴とする
特許請求の範囲第1項記載の映像音声多重記録装置。
[Claims] 1. Separating a video signal into a luminance signal and a chromaticity signal, frequency modulating the luminance signal as a modulation signal, converting the frequency of the chromaticity signal to a lower frequency range, and converting it into at least one audio signal. is frequency-modulated as a modulation signal, and the frequency-modulated luminance signal, low-pass conversion chromaticity signal, and frequency-modulated audio signal are added together and sequentially recorded on adjacent tracks by a plurality of magnetic heads on the same track, In a video/audio multiplexing recording device that has recording formats with at least two different recording track widths, when the recording format has a relatively wide recording track width, a single modulator is provided for the audio signal of one channel, and all Means for recording frequency modulated audio signals having the same carrier wave center frequency on a recording track, and a plurality of frequency modulated audio signals having at least two different carrier wave center frequencies for each audio signal of one channel in a recording format having a relatively narrow recording track width. 1. A video/audio multiplex recording apparatus, comprising a modulator and means for sequentially switching and recording frequency modulated audio signals output from the plurality of modulators for each recording track. 2. For a recording format with a relatively narrow recording track width, a plurality of modulators having at least two different carrier wave center frequencies are provided for each audio signal of one channel,
Claims characterized in that the carrier wave center frequency of any one of the plurality of modulators is selected to be equal to the carrier wave center frequency of a frequency modulated audio signal in a recording format with a relatively wide recording track width. The video/audio multiplex recording device according to item 1. 3. A circuit that separates the video signal into a luminance signal and a chromaticity signal;
A frequency modulator that uses the separated luminance signal as a modulation signal and a high-pass filter that removes low-frequency components from the output of the modulator are provided, and a recording format with a relatively wide recording track width is provided. A patent characterized in that the cut-off frequency of the high-pass filter is set to be relatively low at times, and the cut-off frequency of the high-pass filter is set to be relatively high when the recording format has a relatively narrow recording track width. A video and audio multiplex recording device according to claim 1. 4. The carrier wave frequency of the frequency modulated luminance signal when the recording format has a relatively narrow recording track width is higher than the carrier frequency of the frequency modulated luminance signal when the recording format has a relatively wide recording track width. A video and audio multiplex recording device according to claim 1.
JP57147606A 1982-08-27 1982-08-27 Video and sound multiplex recording device Pending JPS5937794A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57147606A JPS5937794A (en) 1982-08-27 1982-08-27 Video and sound multiplex recording device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57147606A JPS5937794A (en) 1982-08-27 1982-08-27 Video and sound multiplex recording device

Publications (1)

Publication Number Publication Date
JPS5937794A true JPS5937794A (en) 1984-03-01

Family

ID=15434127

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57147606A Pending JPS5937794A (en) 1982-08-27 1982-08-27 Video and sound multiplex recording device

Country Status (1)

Country Link
JP (1) JPS5937794A (en)

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