JPS59156086A - Recording device of video signal and sound signal - Google Patents

Abstract

PURPOSE:To enable sure prevention of cross color disturbance and break of sound by keeping phase relation between carrier of frequency modulated luminance signal and upper and lower side band wave of specified frequency to a specified relation that makes amplitude of side band wave of frequency modulated luminance signal at the time of reproduction zero. CONSTITUTION:A composite signal of frequency modulated luminance signal YF' from a composing circuit 20 and reduced carrier color signal CL and a composite signal of frequency modulated sound signals LFA and RFA from a composing circuit 37 are supplied to a composing circuit 39 and further composed. The composite signal SA is supplied to a rotary head 45 through a record amplifier circuit 41 and a rotary transformer 43 and recorded on alternate tracks slanted to the direction of running of a tape. Further, a composite signal of frequency modulated luminance signal YF' from a composing circuit 20 and a reduced carrier color signal CL, and a composite signal of frequency modulated aural signals LF and RF from a composing circuit 38 are supplied to a composing circuit 40 and composed further, and recorded on alternate tracks slanted to the direction of running of the tape.

Description

【発明の詳細な説明】 産業上の利用分野 本発明（１、周波数変調された輝度信号と、低域変換さ
れた搬送色信号と、低域変換された搬送色信号の帯域の
高域側に隣接する所定の帯域において周波数変調された
音声信号を合成して、磁気記録媒体上に記録する、映像
信号と音声信号の記録装置に関する。Detailed Description of the Invention: Industrial Field of Application The present invention (1. Frequency-modulated luminance signal, low-band converted carrier color signal, and low-band converted carrier color signal on the high band side of the band) The present invention relates to a video signal and audio signal recording device that synthesizes audio signals that are frequency modulated in adjacent predetermined bands and records the synthesized audio signals on a magnetic recording medium.

背景技術とその問題点 ヘリカル・スキャン型のビデオ・テープ・レコーダーで
は、周波数変調さ、ｆＬ　；＋を輝度１ぎ号と低域変換
された搬送色信号の合成信号が、回転磁気ヘッドによシ
、磁気テープの走行方向に対して傾斜したトラックに記
録きれる。この場合、周波数変調された輝度信号がその
まま低域変換された搬送色信号と合成されて記録された
のでは、テープとへラドからなる電磁変換系によって再
生時にヘッドの再生出力に低域変換された搬送色店号の
帯域内において周波数変調てれた輝度１言号の側帯波が
発生することにより、いわゆるクロスカラー妨害を生じ
る。そこで、記録系の輝度信号全変調する周波数変調回
路の出力側にトラップ回路が介挿され、記録にあたって
周波数変調された輝度信号の低域変換てれた搬送色信号
の帯域内の下側帯波が減衰させられる。BACKGROUND ART AND PROBLEMS In a helical scan type video tape recorder, a composite signal of a frequency modulated signal, fL; , recording can be completed on tracks that are inclined with respect to the running direction of the magnetic tape. In this case, if the frequency-modulated luminance signal was directly combined with the carrier color signal that was low-frequency converted and recorded, the electromagnetic conversion system consisting of a tape and a spatula would convert the frequency-modulated luminance signal into the playback output of the head during playback. The generation of frequency-modulated luminance single-word sidebands within the band of the carrier color store name causes so-called cross-color interference. Therefore, a trap circuit is inserted on the output side of the frequency modulation circuit that modulates the entire luminance signal of the recording system. Attenuated.

この記録系のトラップ回路の振幅特性及び位相特性と再
生時の周波数変調された輝度信号の側帯波の振幅特性の
関係は、周波数変調でれた輝度信号の搬送波中心周波数
’ｒｆｃとすると、トラップ回路の振幅特性が第１図に
示すようにｆｃ−ｆＳの周波数で減衰量が最大になる特
性になシ、かつ、トラップ回路の位相特性が第２図に示
すようにｆＣの周波数の搬送波ＣＡとｆ　Ｃ＋ｆ　Ｓの
周波数の上側帯波ＳＵとｆｃ−ｆｓの周波数の下側帯波
ＳＬに対する移相量が同じになる特性になって、トラッ
プ回路の挿入により搬送波ＣＡと上側帯波Ｓｕと下側帯
びＳＬの位相関係が変化せず、トラップ回路を通じた後
でも搬送波ＣＡの位相φ（ＣＡ）と上側帯波ｓＵの位相
φ（Ｓｕ）と下側帯波Ｓｔ、の位相φ（Ｓ　ｔ）の間６
て第９図に示すようにφ（ＳＬ）−φ（ｃＡ）−φ（Ｃ
’Ａ）−φ（Ｓ　Ｕ）・・・・（１）の関係が保たれれ
ば、再生時の周波数変調された輝度信号の側帯波の振幅
特性は第４図の実線／て示すようになり、トラップ回路
の減衰量がある有限の値Ａｏのときに側帯波の振幅は零
になる。The relationship between the amplitude characteristics and phase characteristics of the trap circuit of this recording system and the amplitude characteristics of the sideband of the frequency-modulated luminance signal during reproduction is as follows: If the carrier wave center frequency of the frequency-modulated luminance signal is 'rfc, then the trap circuit As shown in Figure 1, the amplitude characteristic of the trap circuit is such that the attenuation is maximum at the frequency of fc-fS, and the phase characteristic of the trap circuit is as shown in Figure 2, with the carrier wave CA at the frequency of fC. The characteristic is that the phase shift amount for the upper sideband wave SU of the frequency of fC+fS and the lower sideband wave SL of the frequency of fc-fs is the same, and by inserting the trap circuit, the carrier wave CA, the upper sideband wave Su, and the lower sideband wave Even after passing through the trap circuit, the phase relationship of SL does not change, and even after passing through the trap circuit, there is a difference between the phase φ(CA) of the carrier wave CA, the phase φ(Su) of the upper sideband wave sU, and the phase φ(St) of the lower sideband wave St.6
As shown in Fig. 9, φ(SL)-φ(cA)-φ(C
'A) - φ(S U)...If the relationship (1) is maintained, the amplitude characteristics of the sideband waves of the frequency-modulated luminance signal during reproduction will be as shown by the solid line / in Figure 4. Therefore, when the amount of attenuation of the trap circuit is a certain finite value Ao, the amplitude of the sideband wave becomes zero.

もつとも、以上は記録系のトラップ回路より後の記録増
幅回路１回転トランス及び回転ヘッドを含む回路の振幅
特性及び位相特性が平坦な場合を前提とするもので、ト
ラップ回路より後の回路の振幅特性及び位相特性が平坦
でない場合には、上述の条件を満たしても、再生時の側
帯波の振幅特性は第４図の鎖線λで示すように零点を有
しないようになる。例えば、一般には記録増幅回路以降
の回路の振幅特性は高域が落ちる特性になるが、その場
合には、位相特性も第３図に示すように上側帯波Ｓｕが
遅れる特性になって、ヘッドの記録電流でみて搬送波Ｃ
Ａと上側帯波ＳＵと下側帯波ＳＬの位相関係は第３図に
示すように（１）式の関係からずれ、トラップ回路の減
衰量をどんな値にしても再生時の側帯波の振幅は零にな
らない。However, the above is based on the assumption that the amplitude and phase characteristics of the circuit including the recording amplifier circuit, one-rotation transformer, and rotary head after the trap circuit of the recording system are flat, and the amplitude characteristics of the circuit after the trap circuit are flat. If the phase characteristic is not flat, even if the above-mentioned conditions are met, the amplitude characteristic of the sideband during reproduction will not have a zero point, as shown by the chain line λ in FIG. 4. For example, in general, the amplitude characteristics of the circuit after the recording amplifier circuit are such that the high frequencies fall off, but in that case, the phase characteristics also become such that the upper sideband wave Su is delayed, as shown in Figure 3, and the head Carrier wave C in terms of recording current
As shown in Figure 3, the phase relationship between A, the upper sideband wave SU, and the lower sideband wave SL deviates from the relationship in equation (1), and no matter what value the trap circuit attenuation is set to, the amplitude of the sideband wave during reproduction will be It doesn't become zero.

従って、再生時の側帯波の振幅が零になるため（Ｃは、
実際には、周波数変調回路より後のトラップ回路、記録
増幅回路２回転トランス及び回転ヘッドを含む回路の振
幅特性が第１図に示すような特性になるとともに、位相
特性が第２図（で示すような特性になって、ヘッドの記
録電流でみて搬送ｅ　ＣＡと下側帯波ＳＵと下側帯波Ｓ
ｔ、の位相関係が（１）式の関係になるようにされる必
要がある。Therefore, since the amplitude of the sideband waves during reproduction becomes zero (C is
In reality, the amplitude characteristics of the circuit including the trap circuit after the frequency modulation circuit, the recording amplifier circuit, the two-rotation transformer, and the rotary head will be as shown in Figure 1, and the phase characteristics will be as shown in Figure 2 ( With these characteristics, in terms of the recording current of the head, the transport e CA, the lower side band wave SU, and the lower side band wave S
It is necessary to make the phase relationship of t, as shown in equation (1).

ところで、通常の記録方式では、音声信号（・１変調さ
れることなく、固定ヘッドにより、テープの一側部のテ
ープの走行方向に延長するトラックにバイアス記録でれ
る。そのため、長時間の記録ができるようにテープの走
行速度が遅くされる場合には、音声ｆ信号の特性が劣化
する。これに対して、第７図に示すように、低域変換さ
れた搬送色１言号ＣＬの計域の高域側に隣接する所定の
帯域が音声信号の帯域とされ、この帯域に周波数変調さ
れた音声信号ＡＦが周波数多重はれ、これら低域鏡伊さ
れた搬送色信号ＣＬと周波数変調された音声信号ＡＦと
周波数変調され定輝度言置ＹＦの合成信号が、回転ヘッ
ドにより、テープの走行方向に対して傾斜したトラック
に記録される方式が考えられておυ、この方式によれば
、長時間の記録ができるようにテープの走行速度が遅く
される場合にも、音声信号の！特性が劣化することがな
い。By the way, in the normal recording method, the audio signal (1) is not modulated and is bias recorded using a fixed head on a track extending in the running direction of the tape on one side of the tape. If the running speed of the tape is slowed down so as to reduce the speed of the tape, the characteristics of the audio f signal deteriorate.On the other hand, as shown in FIG. A predetermined band adjacent to the high-frequency side of the frequency range is defined as the audio signal band, and the frequency-modulated audio signal AF is frequency-multiplexed into this band, and is frequency-modulated with the carrier color signal CL that is modulated in the lower range. A method has been proposed in which a composite signal of the frequency-modulated audio signal AF and the constant luminance expression YF is recorded by a rotating head on a track inclined with respect to the running direction of the tape.According to this method, Even when the running speed of the tape is slowed down to allow long-time recording, the characteristics of the audio signal do not deteriorate.

実際には、第７図の音声信号の帯域内に９つの中心周波
数ｆ／−ｆ、ｘが設定され、例えば、λチャンネルの音
声信号の一方がｆｌ、ｆ２の中心周波数を用いて周波数
変調されるとともに他方がｆＪ＋ｆ＆の中心周波数を用
いて周波数変調され、ある７６つおきのトラックにｎ　
ｆ　／、、　ｆ　、？の中心・周波数を用いて周波数変
調され定音声１言号が記録式れ、他の１つおきのトラッ
クにｕ　ｆ　、２１　ｆ　４１の中心周波数を用いて周
波数変調テ′Ｉ″した音声信号が記録さ九る。−例とし
て、ｆｌが／、３ｇＭＨｚ　、　ｆ−が７．３３ＭＨｚ
　、　ｆ　、、？が／、乙ｇＭＨ２、ｆ　、が／、ｇ３
ＭＨｚに芒れ、従って第７図の音声信号の帯域の中心周
波数ｆＡが約／　、　ｌ、　ＭＨｚに式れ、それぞれの
周波数変調された音声信号の最大周波数偏移が±３０ｋ
Ｈｚないし±７３　ｋＨｚにでれる。なお、例えば、低
域変換された搬送色信号ＣＬＯ色副色副搬送波周波数は
約のＡ９ＭＨ２にされ、周波数に調された輝度信号ＹＦ
の搬送波中上・周波数ｆＣはグ、’７ＭＨ２にされる。In reality, nine center frequencies f/-f and x are set within the audio signal band shown in FIG. 7, and for example, one of the λ channel audio signals is frequency modulated using the center frequencies of fl and f2. and the other is frequency modulated using the center frequency of fJ+f&, and n is applied to every 76th track.
f/,, f,? One constant audio word is recorded using the center frequency of u f , 21 f , and the audio signal frequency modulated using the center frequency of 41 is recorded on every other track. - For example, fl is /, 3gMHz, f- is 7.33MHz.
, f,,? ga/, otgMH2, f, ga/, g3
MHz, so the center frequency fA of the audio signal band in Figure 7 is approximately /, l, MHz, and the maximum frequency deviation of each frequency-modulated audio signal is ±30k.
Hz to ±73 kHz. Note that, for example, the carrier color signal CLO color subcolor subcarrier frequency that has been low-pass converted is set to approximately A9MH2, and the frequency-tuned luminance signal YF
The carrier wave frequency fC is set to '7MH2.

この特殊な記録方式による場合には、周波数変調された
輝度信号ＹＦがそのま１低域変換σれた搬送色信号ＣＬ
及び周波数変調された音声信号ＡＦと合成でれて記録さ
れると、テープとヘッドからなる電磁変換系によって再
生時にヘッドの再生出力に低域変換された搬送色信号Ｃ
Ｌ及び周波数変調された音声信号ＡＦの帯域内において
周波数変調きれた輝度信号ＹＦＯ側帯側帯発生すること
により、前述のクロスカラー妨害とともにいわゆる音の
破れ音生じる。そこで、この場合には、記録系の輝度信
号を変調する周波数変調回１烙の出力側に、第３図に示
すように周波数変調きれた輝度信号ＹＦの低域変換され
た搬送色信号ＣＬの帯域内の下側帯波を減衰させるｆＬ
の中心周波数のトラップ回路と、第９図シて示すように
周波数変調きれた音声信号ＡＦの帯域内の下側帯波全減
衰σせるｆＡの中心周波数のトラップ回路全介挿する必
要がある。In the case of this special recording method, the frequency-modulated luminance signal YF is directly converted into the carrier color signal CL by 1 low frequency conversion σ.
When combined with the frequency-modulated audio signal AF and recorded, the carrier color signal C is converted into a low-frequency signal C into the playback output of the head during playback by an electromagnetic conversion system consisting of a tape and a head.
When the sideband of the frequency-modulated luminance signal YFO is generated within the band of the L and frequency-modulated audio signal AF, so-called broken sound occurs along with the aforementioned cross-color interference. Therefore, in this case, as shown in FIG. 3, the carrier color signal CL, which is a low frequency-converted version of the frequency-modulated luminance signal YF, is sent to the output side of the frequency modulation circuit 1 that modulates the luminance signal of the recording system. fL that attenuates the lower sideband wave within the band
It is necessary to insert a trap circuit with a center frequency of fA, and a trap circuit with a center frequency of fA, which reduces the total attenuation of the lower side band within the band of the frequency-modulated audio signal AF, as shown in FIG.

この場合、トラップ回路より後の記録増幅回路。In this case, the recording amplifier circuit after the trap circuit.

回転トランス及び回転ヘッドを含む回路の振幅特性及び
位相特性が平坦にされるとして、第１図〜第乙図で説明
した理論から、ｆＬの中心周波数のトラップ回路のみに
ついて考えれば、その位相特性を第７０図の曲線３て示
すよう１ｃ搬送彼ＣＡとｆＬ’−ｆ　ｃ十（ｆ　ｃ−ｆ
　Ｌ）の周波数の下側帯波ＳＵ／とｆＬの周波数の下側
帯波ＳＬ／に対する移相量が同じになる特性にして、ト
ラップ回路の挿入によシ搬送波ＣＡと上側帯波ＳＵ／と
下１１１１１帯彼ＳＬ／の位相関係が変化せず、搬送波
ＣＡの位相φ（ＣＡ）と上側帯波ＳＵ／の位相φ（ＳＯ
／）と下側帯波ＳＬ／の位相φ（ＳＬ／）の間に φ（ＳＬ／）−φ（ＣＡ）−φ（ＣＡ）−φ（ＳＵ／）
　　−−（２）の関係が保たれるようにすれば、トラッ
プ回路の減衰量がある有限の値のときに再生時の周波数
変調された輝度信号の側帯波の振幅は零になる。ま；’
（、ｆＡの中心・周波数のトラップ回路のみについて考
えれば、同様に、その位相特性全第７０図の曲線グで示
すように搬送波ＣＡとｆＡ′＝ｆｃ＋（ｆ　ｃ　　、ｆ
　Ａ）の周波数の上側帯波ＳＵ、２とｆＡの周波数の下
側帯波ＳＬ２に対する移相量が同じになる特性にして、
トラップ回路の挿入によシ搬送波ＣＡと下側帯波ＳＵ２
と下側帯波ＳＬユの位相関係が変化せず、搬送波ｃＡの
位相φ（ＣＡ）と下側帯波ＳＵ、２の位相φ（ＳＵ２）
と下側帯波ＳＬ、２の位相φ（Ｓｔ、２）の間に φ（ＳＬコ）−φ（ＣＡ）−φ（ＣＡ）−φ（ＳＵ、２
）”°°゛（３）の関係が保たれるようにすれば、トラ
ップ回路の減衰量がある有限の値のときに再生時の周波
数変調された輝度信号の側帯波の振幅は零になる。Assuming that the amplitude and phase characteristics of the circuit including the rotary transformer and the rotary head are flattened, and from the theory explained in Figures 1 to 2, if we consider only the trap circuit at the center frequency of fL, its phase characteristics can be As shown by curve 3 in Figure 70, 1c transport CA and fL'-f c0 (f c-f
L) frequency lower sideband wave SU/ and fL frequency lower sideband wave SL/ have the same phase shift amount by inserting a trap circuit. The phase relationship between the upper sideband SL/ does not change, and the phase φ(CA) of the carrier wave CA and the phase φ(SO
/) and the phase φ(SL/) of the lower sideband wave SL/, φ(SL/)-φ(CA)-φ(CA)-φ(SU/)
--If the relationship (2) is maintained, the amplitude of the sideband of the frequency-modulated luminance signal during reproduction becomes zero when the amount of attenuation of the trap circuit is a certain finite value. Ma;'
(, If we consider only the trap circuit at the center/frequency of fA, similarly, its phase characteristics will be the same as the carrier wave CA and fA'=fc+(f c , f
With the characteristic that the amount of phase shift with respect to the upper sideband wave SU, 2 of the frequency of A) and the lower sideband wave SL2 of the frequency of fA is the same,
By inserting a trap circuit, carrier wave CA and lower sideband wave SU2
The phase relationship between the carrier wave cA and the lower sideband wave SL does not change, and the phase φ(CA) of the carrier wave cA and the phase φ(SU2) of the lower sideband wave SU,2
and the phase φ(St, 2) of the lower sideband wave SL,2.
)”°°゛If the relationship (3) is maintained, the amplitude of the sideband of the frequency-modulated luminance signal during reproduction becomes zero when the attenuation of the trap circuit is a certain finite value. .

しかし、このように輝度信号全変調する周波数変調回路
の出力側（ｃ）個のトラップ回路を介挿すると、系全体
の位相特性は移相量が各々のトラップ回路での移相量全
加算した値になる特性になシ、各々のトラップ回路の位
相特性を第７０図の曲線３．４１で示すような特性にす
るときは、系全体の位相特性は第１／図の曲線汐で示す
よう（（搬送波ＣＡと上側帯波ＳＵ、／　ｌ　ＳＵ、２
と下ＩＩ′＋ｌＩ帯彼ＳＬ／　＋　ＳＬ、２に対する移
相量が同じにならない特性になり、２個のトラップ回路
の挿入により搬送波ＣＡと上側帯波ＳＵ／　＋　ＳＵ２
と下側帯波ＳＬ／　ｌ　ＳＬ、２の位相関係が変化して
、（２）式及び（３）式の関係が得られなくなり、再生
時の周波数変調された輝度信号の側帯波の振幅が零にな
らずに、クロスカラー妨害と音の破れ音生じてし甘う。However, if (c) trap circuits are inserted on the output side of the frequency modulation circuit that fully modulates the luminance signal, the phase characteristics of the entire system will be such that the phase shift amount is equal to the total sum of the phase shift amounts in each trap circuit. When the phase characteristics of each trap circuit are made to be as shown by curve 3.41 in Figure 70, the phase characteristics of the entire system are as shown by curve 3.41 in Figure 1/. ((carrier CA and upper sideband SU, / l SU, 2
The characteristic is that the phase shift amount for the lower II'+lI band SL/+SL,2 is not the same, and by inserting two trap circuits, the carrier wave CA and the upper sideband wave SU/+SU2
The phase relationship between the lower sideband wave SL/l SL,2 changes, and the relationships in equations (2) and (3) are no longer obtained, and the amplitude of the sideband wave of the frequency-modulated luminance signal during reproduction becomes zero. However, cross-color interference and broken sound occur without causing problems.

発明の目的 本発明は、周波数変調された輝度１言号と、低域変換さ
れた搬送色信号と、低域変換はれた眼送色信号の帯域の
高域側に隣接する所定の帯域において周ｅ、数変調はれ
た音声信号を合成して、磁気記録媒体上に記録する、映
像信号と音声信号の記録装置において、再生時にクロス
カラー妨害と音の破れを生じないように、輝度ｆ言置を
変調する周波数変調回路の出力側に、周波数変調された
輝度信号の低域変換された搬送色信号の帯域内の下側帯
波及び周波数変調された音声信号の帯域内の下側帯波を
それぞれ減衰させる２個のトラップ回路を介挿する場合
に、クロスカラー妨害と音の破れ全確実に防止できるよ
うにしたものである。OBJECTS OF THE INVENTION The present invention provides a frequency-modulated luminance signal, a low-frequency-converted carrier color signal, and a low-frequency-converted eye color signal in a predetermined band adjacent to the high frequency side of the band. In a recording device for video and audio signals that synthesizes audio signals that have been modulated several times and records them on a magnetic recording medium, the brightness f is adjusted to prevent cross-color interference and sound breakage during playback. On the output side of the frequency modulation circuit that modulates the speech, a lower band in the band of the carrier chrominance signal converted to a lower band of the frequency modulated luminance signal and a lower band in the band of the frequency modulated audio signal are connected to the output side of the frequency modulation circuit that modulates the speech. When inserting two trap circuits that each attenuate, cross-color interference and sound breakage can be completely prevented.

発明の概要 周波数変調された輝度信号ＹＦの周（＆数変調σれた音
声１言号ＡＦの帯域内の下側帯ｅを減衰させるｆＡの中
心周波数のトラップ回路の位相特性ケ、第７２図の曲線
グで示すよう、に搬送波ＣＡとｆＬ’＋ｆＡ′の周波数
の上側帯波ＳＵ／　Ｉ’ＳＵ、２とｆＡの間波数の下側
帯波ＳＬ−に対する移相量が同じになる特性にするとと
もに、周波数変調された輝度信号ＹＦの低域変換でれた
搬送色信号ＣＬの帯域内の下側帯波全減衰させるｆＬの
中上・周波数のトラップ回路の位相特性も、第７０図の
曲線３で示す特性ではなく、第１２図の曲線３′で示す
ように搬送波ＣＡと上側帯′ｅ、ｓｕｚ　＋　ＳＵ、２
と下側帯波ＳＬ、２に対する移相量が同じになる特性に
すれば、系全体の位相特性は、第７３図の曲線乙で示す
ように、搬送波ＣＡと下側帯波ＳＵ／　＋　ＳＵ、２と
下側帯波ＳＬ、２に対する移相量が同じになり、ｆＬの
周波数の下１１１］帯′ｅ、ＳＬ／に対する移相量がこ
れらに対して位相が遅れる方向にθだげ異なるような特
性になる。Outline of the Invention The phase characteristics of the trap circuit at the center frequency of fA that attenuates the lower band e in the frequency band of one voice AF that has been frequency modulated (& number modulated σ), as shown in Fig. 72. As shown in the curve, the carrier wave CA and the frequency of fL'+fA' are set to have the same phase shift amount with respect to the upper sideband wave SU/I'SU of the frequency, and the lower sideband wave SL- of the wave number between 2 and fA. , the phase characteristics of the trap circuit for the middle and upper frequencies of fL, which completely attenuates the lower band within the band of the carrier color signal CL obtained by low-frequency conversion of the frequency-modulated luminance signal YF, are also expressed by curve 3 in FIG. Rather than the characteristic shown in Fig. 12, the carrier wave CA and the upper side band 'e, suz + SU, 2 as shown by curve 3'
If the phase characteristics for the carrier wave CA and the lower sideband wave SL, 2 are the same, the phase characteristics of the entire system will be as shown by curve B in Fig. 73, where the carrier wave CA and the lower sideband wave SU/ + SU, 2 The phase shift amount for the lower sideband wave SL,2 is the same, and the phase shift amount for the lower 111] band 'e, SL/ of the frequency of fL differs by θ in the direction in which the phase lags with respect to these. become.

ところで、第１４１図の特性で示すようにカットオフ周
波数がｆＬを中心とする低域変換された搬送色言置の帯
域ないしｆＡ’に中心とする周波数変調された音声信号
の帯域内の周波数に選定されたバイパスフィルタは、そ
の位相特性を、第７５図の曲線７て示すように、ｆＡ以
上の周波数の信号成分に対する移相量が零で、ｆ　Ｌの
周波数の信号成分に対する移相量が位相が進む方向にち
ょうど上述のθになるような特性にすることができる１
゜本発明は、かような点に着目して、周波数変調された
輝度信号を得る回路の出力側に、低域変換された搬送色
信号の帯域内の信号成分を減衰でせるｆＬの中心周波数
の第１のトラップ回路と、周波数変調された音声信号の
帯域内の信号成分を減衰させるｆＡの中心周波数の第λ
のトラップ回路と、カットオフ周波数が低域変換された
搬送色回帰の４８’域ないし周波数変調された音声信号
の帯域内の周波数に選定きれたバイパスフィルタケ、任
意の項番に配列して介挿し、これら第１のトラップ回路
、第２のトラップ回路及びバイパスフィルタケ含む系全
体の位相特性を、第１乙図の曲線とで示すように搬送ｅ
ｃＡとｆＬ′、ｆＡ′の上側帯波ＳＵ／　ｒ　ＳＵ、２
とｆＬ、ｆＡの下側帯ｔｉｓＬ／、　Ｓｌ、、２ＶＣ対
する移相量が同じになる特性にする。By the way, as shown in the characteristics of Fig. 141, the cutoff frequency is within the band of the low-pass-converted carrier color position centered at fL or the frequency-modulated audio signal band centered at fA'. The phase characteristics of the selected bypass filter are as shown by curve 7 in FIG. It is possible to make the characteristic such that the above-mentioned θ is exactly the same in the direction in which the phase advances1
゜The present invention focuses on such points, and the present invention provides a center frequency fL that can attenuate signal components within the band of a carrier color signal that has been low-pass converted, on the output side of a circuit that obtains a frequency-modulated luminance signal. and a first trap circuit with a center frequency of fA that attenuates the in-band signal component of the frequency-modulated audio signal.
A trap circuit and a bypass filter whose cutoff frequency is selected to be in the 48' band of the carrier color regression whose cut-off frequency is low-pass converted or within the band of the frequency-modulated audio signal can be arranged in an arbitrary number and used for intervention. The phase characteristics of the entire system including the first trap circuit, second trap circuit, and bypass filter are determined as shown by the curve in Figure 1.
cA and fL', fA' upper sideband SU/r SU, 2
The characteristics are such that the amount of phase shift with respect to the lower band tisL/, Sl, , 2VC of and fL, fA is the same.

実　　施　　例 第７７図は本発明の記録装置の一例で、映像信号とλチ
ャンネルの音声信号が磁気テープの走行方向に対して傾
斜したトラックに高密度に記録される場合である。Embodiment FIG. 77 shows an example of the recording apparatus of the present invention, in which a video signal and a λ channel audio signal are recorded at high density on a track inclined with respect to the running direction of a magnetic tape.

映ｆ象信号入力端子／／よりの映像信号がローパスフィ
ルタ／２に供給されて輝度信号Ｙが取り出され、これが
周波数変調回路／３に供給されて周波数変調された輝度
１言号ＹＦが得られる。The video signal from the image signal input terminal // is supplied to a low-pass filter /2 to extract a luminance signal Y, which is supplied to a frequency modulation circuit /3 to obtain one frequency-modulated luminance word YF. .

そして、本発明では、周波数変調回路／３の出力側にバ
イパスフィルタ／グと第１のトラップ回路１５と第ユの
トラップ回路／乙が介挿はれる。In the present invention, a bypass filter, a first trap circuit 15, and a third trap circuit B are inserted on the output side of the frequency modulation circuit B.

バイパスフィルタ／４ｔＵコンデンサｃ／とコイルＬ／
で構成され、第１１’図に示すようにそのカットオフ周
波数がｆＬｋ中心とする低域変換された搬送色信号の帯
域ないしｆＡを中心とする周波数変調された音声信号の
帯域内の周波数に選定でれて、その位相特性が第１Ｓ図
の曲、腺７で示すようにされる。トラップ回路／左、／
乙はそれぞれコンデンサＣ，２’ｌ　ＣａとコイルＬλ
ｒ　Ｌ　３とダンピング抵抗Ｒ，２１Ｒ３で構成され、
第ｇ図、第９図に示すようにそれぞれの中心周波数がｆ
Ｌ＋ｆＡに選定される。また、トラップ回路／乙の位相
特性が第７２図の曲線グで示すようにされるとともに、
ダンピング抵抗Ｒ２の調整によ、Ｉドラッグ回路１５の
位相特性が第７２図の曲、腺３′で示すようにされて、
２個のトラップ回路／Ｓ及び／乙ヲ合わせた回路の位相
を時性が第７３図の曲線乙で示すようになシ、バイパス
フィルタ／グとトラップ回路１５及び／乙よりなる回路
全体の位相特性が第１乙図の曲線ｇで示すように搬送波
ＣＡとｆＬ′。Bypass filter/4tU capacitor c/ and coil L/
As shown in FIG. 11', the cutoff frequency is selected as a frequency within the band of the low-pass converted carrier color signal centered on fLk or the frequency modulated audio signal band centered on fA. and its phase characteristics are as shown by curve 7 in Figure 1S. Trap circuit/left,/
B are capacitors C, 2'l Ca and coil Lλ, respectively.
Consisting of r L 3 and damping resistor R, 21R3,
As shown in Figures g and 9, each center frequency is f
L+fA is selected. In addition, the phase characteristics of the trap circuit/B are made as shown by the curve in FIG. 72, and
By adjusting the damping resistor R2, the phase characteristics of the I-drag circuit 15 are made as shown by curve 3' in FIG.
The phase of the circuit that combines the two trap circuits /S and /B is as shown by the curve O in Figure 73, and the phase of the entire circuit consisting of the bypass filter /G and the trap circuit 15 and /B is as follows. The characteristics of carrier waves CA and fL' are as shown by curve g in Figure 1.

ｆＡ′の上側帯波Ｓｕ／＋　ＳＵ、２　（！：　ｆ　Ｌ
　ｌ’　ｆ　Ａ　（７）　Ｔｌｕｌ）−計伎ＳＬ／　ｒ
　ＳＬ、２に対する移相量が同じになる特性になるよう
にされる。従って、トラップ回路／汐及び／乙の挿入に
よｌｉ送ｅ、ＣＡと下側帯波ＳＵ／＋Ｓｕｘと下側帯波
ＳＬ、／　ｐ　ＳＬ、２の位相関係が変化せず、トラッ
プ回路／Ｓ及び／乙を通じた後でも前述の（２）式及び
（３）式の関係が保たれる。Upper sideband wave of fA′ Su/+SU, 2 (!: f L
l' f A (7) Tlul)-KeikiSL/r
The characteristics are such that the amount of phase shift for SL, 2 is the same. Therefore, the phase relationship between the trap circuits /S and /P does not change due to the insertion of the trap circuits /S and /B, and the phase relationship between the lower sideband waves SU/+Sux and the lower sideband waves SL, /pSL,2 does not change. Even after passing through Party B, the relationships in equations (2) and (3) above are maintained.

１次、映像ｆ言置入力端子／／よりの映像信号がバンド
パスフィルタ／７に供給されて色副搬送波周波数が３．
３ｇＭＨｚの搬送色信号Ｃが取り出され、これが周波数
変換回路ｉｇｖｃ供給されて色副搬送波周波数がｆＬの
低域変換された搬送色１言号ＣＬが得られ、これがロー
パスフィルタ／ヲ全通じて取り出される。そして、バイ
パスフィルタ／ｌｌとトラップ回路１５及び／乙を通じ
た周波数変調された輝度信号ＹＦ’と、ローパスフィル
タ／９を通じた低域変換された搬送色信号ＣＬが、合成
回路２０に供給されて合成される。The first-order video signal from the video input terminal // is supplied to a bandpass filter /7, and the color subcarrier frequency is set to 3.
A carrier color signal C of 3 gMHz is taken out, and this is supplied to a frequency conversion circuit igvc to obtain a low-pass converted carrier color 1 word CL with a color subcarrier frequency of fL, which is taken out through a low-pass filter. . Then, the frequency-modulated luminance signal YF' passed through the bypass filter /ll and the trap circuits 15 and /B, and the low-pass converted carrier color signal CL passed through the low-pass filter /9 are supplied to the synthesis circuit 20 and synthesized. be done.

一方、音声信号入力端子２／、２．）、よりのλチャン
ネルの音声信号り、Ｒが、自動利得制御回路２３、．２
’ｌ、ノイズ低減回路、２５．．２乙及びプリ・エンフ
ァンス回路２７．２ｇ’ｊｒ：順次介して取り出され、
グリ・エンファンス回路２７を介した音声信号りが周波
数変調回路２９．．３０に供給さ九で、第１ｇ図に示す
ように中心周波数がｆ／ｒｆ、の周波数変調された音声
１言号ＬＦＡ、　ＬＦＢが得られるとともに、ブリ・エ
ンファンス回路、２ｇ’ｃ介した音声信号Ｒが周波数変
調回路３７，３．２に供給されて、同図に示すように生
毛・周波数がｆ３゜ｆ＆の周波数変調きれた音声信号Ｒ
ＦＡ　、　ＲＦＢが得られ、信号ＬＦＡ　、　ＲＦＡが
中心周波数がｆｚ＋ｆＪのバンドパスフィルタ３３．３
３を通じて合成回路３７　Ｋ供給されて合成されるとと
もｊて、信号ＬＦＢ　、　ＲＦＢが中上・周波数がｆ２
．ｆ４のバンドパスフィルタ３４／−，３乙を通じて合
成回路３ｇＶＣ供給されて合成される。On the other hand, audio signal input terminals 2/, 2. ), the audio signal of the λ channel, R, is input to the automatic gain control circuit 23, . 2
'l, noise reduction circuit, 25. ．． 2 O and pre-emphasis circuit 27.2 g'jr: taken out sequentially,
The audio signal passing through the green enhancement circuit 27 is transmitted to the frequency modulation circuit 29. ．． 30, one frequency-modulated audio word LFA, LFB with a center frequency of f/rf as shown in Figure 1g is obtained, and the audio signal is transmitted through the Buri-Emphasis circuit and 2g'c. R is supplied to the frequency modulation circuit 37, 3.2, and as shown in the same figure, the frequency modulated audio signal R with a frequency of f3°f& is generated.
FA and RFB are obtained, and the signals LFA and RFA are bandpass filters whose center frequencies are fz+fJ 33.3
3, the signals LFB and RFB are fed to the synthesis circuit 37 and synthesized.
．． The signal is supplied to the synthesis circuit 3gVC through bandpass filters 34/- and 3B of f4 and is synthesized.

そして、合成回路２０よりの周波数変調され一化輝変信
号ＹＦ’及び低域変換て汎た搬送色信号ＣＬの合成信号
と、合成回路３７よりの周波数変調された音声信号ＬＦ
Ａ及びＲＦＡの合成重ぎ号が、合成１■１１路３９に供
給されて更に合成きれ、その合成信号ＳＡが記録増幅回
路グ／及び回転トランス１１３’ｔ−介して回転ヘッド
ｌ１３に供給されて、テープの走行方向に対して傾斜し
たあるＺつおきのトラックに記録される。また、合成回
路２０よりの周波数変調きれた輝度信号ＹＦ’及び低域
変換された搬送色信号ＣＬの合成信号と、合成回路３ｇ
よりの周波数変調された音声信号ＬＦＢ及びＲＦＢの合
成信号が、合成回路グ０に供給されて更に合成でれ、そ
の合成信号ＳＢが記録増幅回路’１２及び回転トランス
１ｌｌｌヲ介して回転ヘラドグ乙に供給てれて、テープ
の走行方向に対して傾斜した他の７つおきのトラップに
記録される。Then, a synthesized signal of the frequency-modulated unified brightness variable signal YF' from the synthesis circuit 20 and the carrier color signal CL which has been low-pass converted, and the frequency-modulated audio signal LF from the synthesis circuit 37.
The combined weight signals of A and RFA are supplied to the combination 111 path 39 and further combined, and the combined signal SA is supplied to the rotary head l13 via the recording amplifier circuit G/ and the rotary transformer 113't-. , are recorded on every Z track inclined with respect to the tape running direction. Further, a composite signal of the frequency-modulated luminance signal YF' and the low-frequency-converted carrier color signal CL from the composite circuit 20 and the composite circuit 3g
The synthesized signal of the frequency-modulated audio signals LFB and RFB is supplied to the synthesizer circuit 0 and further synthesized, and the synthesized signal SB is sent to the rotary helladog B via the recording amplification circuit '12 and the rotary transformer 111. The tape is fed and recorded in every seventh other trap that is inclined with respect to the direction of tape travel.

なお、合成回路２０から回転ヘッドｔｔＳ及びグ乙まで
の回路の振幅特性及び位相特性は平坦にされて、ヘッド
４ｔ５及びグ乙の記録電流でみて搬送波ＣＡと上側帯波
ＳＵ／　＋　Ｓｏコと下側帯波ＳＬ／ＩＳＬ、２の位相
関係が前述の（，２）式及び（３）式の関係に保たれる
ようにされる。Note that the amplitude and phase characteristics of the circuit from the synthesis circuit 20 to the rotating head ttS and the rotary head ttS are flattened, and the carrier wave CA, the upper sideband wave SU/ + Soco and the lower sideband wave are The phase relationship between the sideband waves SL/ISL, 2 is maintained as expressed by the above-mentioned equations (, 2) and (3).

発明の効果 本発明によれば、周波数変調された輝度信号と、低域変
換てれた搬送色信号と、低域変換された搬送色信号の帯
域の高域側に隣接する所定の帯域において周波数変調さ
れた音声信号を合成して、磁気記録媒体上に記録する、
映像信号と音声信号の記録装置において、再生時にりａ
スカラー妨害と音の破れ全土じないように、輝度信号全
変調する周波数変調回路の出力側（Ｃ１周波数変調され
た輝度信号の低域変換された搬送色信号の帯域内の下側
帯波及び周波数変調された音声信号の帯域内の下側帯波
をそれぞれ減衰させるコ個のトラップ回路全介挿する場
合に、これら２個のトラップ回路とともにカットオフ周
波数が低域変換はれた搬送色信号の帯域ないし周波数変
調された音声信号の帯域内の周波数に選定されたバイパ
スフィルタを介挿し、これら２個のトラップ回路とバイ
パスフィルタを含む系全体の位相特四を周波数変調され
た輝度信号の搬送波と所定の周波数の上下側１６彼に対
する移相量が同じになる特性にすることにより、周波数
変調された輝度信号の搬送波と所定の周波数の上下側帯
波の位相関係を再生時の周彼数変調された輝度信号の側
帯波の振幅が零になるような所定の関係に保つようにし
たので、クロスカラー妨害と音の破れ全確実に防止でき
るようになる。Effects of the Invention According to the present invention, a frequency modulated luminance signal, a carrier color signal subjected to low frequency conversion, and a frequency modulation in a predetermined band adjacent to the high frequency side of the band of the carrier color signal subjected to low frequency conversion. Synthesizing the modulated audio signals and recording them on a magnetic recording medium.
In a video signal and audio signal recording device, when playing back a
To avoid scalar interference and sound breakage, the output side of the frequency modulation circuit that modulates the entire luminance signal (C1 lower band and frequency modulation within the band of the frequency-modulated luminance signal, carrier chrominance signal that is low-pass converted) When inserting all of the trap circuits that attenuate the lower band waves in the band of the audio signal, the cutoff frequency along with these two trap circuits will lower the band of the carrier color signal that has been converted to a lower band. A bypass filter selected at a frequency within the band of the frequency-modulated audio signal is inserted, and the phase characteristic of the entire system including these two trap circuits and the bypass filter is set to the carrier wave of the frequency-modulated luminance signal and a predetermined frequency. By making the characteristics such that the amount of phase shift for the upper and lower sides of the frequency is the same, the phase relationship between the carrier wave of the frequency-modulated luminance signal and the upper and lower sideband waves of a predetermined frequency can be adjusted to determine the frequency-modulated luminance during reproduction. Since a predetermined relationship is maintained so that the amplitude of the sideband of the signal becomes zero, cross-color interference and sound breakage can be completely prevented.

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

第１図〜第３図は信号系の振幅特性と位相特性の例を示
す図、第７図及び第Ｓ図は周波数変調てれた輝度信号の
搬送波と上下側帯波の位相関係を示す図、第４図は記録
装置のトラップ回路の減衰量と再生時の側帯波の振幅の
関係を示す図、第７図は記録される信号の周波数スペク
トラムを示す図、第３図及び第９図は第１及び第ユのト
ラップ回路の振幅特性を示す図、第７０図〜第７３図は
第１及び第２のトラップ回路ないし両者を合わせた回路
の位Ａ目特性の例を示す図、第１グ図及び第１左図は本
発明の記録装置で用いるバイパスフィルタの振幅特性と
位相特性の例を示す図、第１乙図は本発明の記録袋装置
の２個のトラップ回路とバイパスフィルタを含む系全体
の位相特性を示す図、第７７図は本発明の記録装置の接
続構成の一例を示す図、第１ｇ図は音声信号の周波数変
調の態様の一例を示す図である。 図中、／／は映像信号入力端子、／、２はローパスフィ
ルタ、／３は周波数変調回路、／りはノ・イバスフィル
タ、１５及び／乙は第１及び第コのトラップ回路、７７
１はバンドパスフィルタ、７ｇは周波数変換回路、／９
はローパスフィルタ、２／及び２２は音声信号入力端子
、２９〜３．２．は周波数変調回路である。 代理人　弁理士　神　原　貞　昭、 ゛・“。 ｋ　　　　ｆＡ　　　　　　　　　ｆｃ　　　　　　　
　　　ｔＡ　　　ｔＬ　　ノｉｌ［り；第１４図 第＃５図Figures 1 to 3 are diagrams showing examples of the amplitude characteristics and phase characteristics of the signal system, Figures 7 and S are diagrams showing the phase relationship between the carrier wave and upper and lower sideband waves of a frequency-modulated luminance signal, Fig. 4 is a diagram showing the relationship between the attenuation amount of the trap circuit of the recording device and the amplitude of the sideband wave during reproduction, Fig. 7 is a diagram showing the frequency spectrum of the recorded signal, and Figs. Figures 70 to 73 are diagrams showing examples of the amplitude characteristics of the first and second trap circuits, or a combination of both; The figure and the first left figure are diagrams showing examples of the amplitude characteristics and phase characteristics of the bypass filter used in the recording device of the present invention, and the first figure B shows the recording bag device of the present invention including two trap circuits and a bypass filter. FIG. 77 is a diagram showing an example of the connection configuration of the recording apparatus of the present invention, and FIG. 1g is a diagram showing an example of the frequency modulation of an audio signal. In the figure, // is a video signal input terminal, /, 2 is a low-pass filter, /3 is a frequency modulation circuit, / is a new bass filter, 15 and /B are first and second trap circuits, 77
1 is a band pass filter, 7g is a frequency conversion circuit, /9
are low-pass filters, 2/ and 22 are audio signal input terminals, 29 to 3.2. is a frequency modulation circuit. Agent: Patent Attorney Sadaaki Kamihara, ゛・“. k fA fc
tA tL Noil [ri; Figure 14 Figure #5

Claims (1)

【特許請求の範囲】[Claims] 輝度信号を周波数変調して、周波数変調された輝度１８
号を得る回路と、搬送色信号を低域変換して、低域変換
された搬送色信号を得る回路と、音高域側に隣接する所
定の帯域において周波数変調して、周ｅ数変調された音
声信号を得る回路を有し、上記周波数変調された輝度信
号を得る回路の出力側に、上記低域変換きれた搬送色信
号の帯域内の信号成分全減衰させる第１のトラップ回路
と、上記周波数変調きれた音声信号の帯域内の信号成分
を減衰させる第２のトラップ回路と、カットオフ周波数
が上記低域変換された搬送色信号の帯域ないし上記周波
数変調された音声信号の帯域内の周波数に選定されたバ
イパスフィルタが介挿され、これら第１のトラップ回路
、第２のトラップ回路及び・・イバスフィルタを通じた
周波数変調された輝度信号と上記低域変換きれた搬送色
信号と上記周波数変調された音声信号が合成されて、そ
の合成信号が磁気記録媒体上に記＠てれる、映像信号と
音声信号の記録装置。Frequency-modulated luminance 18 is obtained by frequency modulating the luminance signal.
a circuit that converts the carrier color signal to a low frequency band to obtain a low-frequency converted carrier color signal; a first trap circuit for attenuating all signal components within a band of the low frequency-converted carrier color signal; a second trap circuit that attenuates signal components within the band of the frequency-modulated audio signal; A bypass filter selected for the frequency is inserted, and the first trap circuit, the second trap circuit, and the frequency-modulated luminance signal through the Ibus filter, the low-frequency converted carrier color signal, and the above A recording device for video and audio signals, in which frequency-modulated audio signals are synthesized and the synthesized signal is recorded on a magnetic recording medium.