JPH04207787A - Magnetic recorder - Google Patents

Magnetic recorder

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Publication number
JPH04207787A
JPH04207787A JP2338355A JP33835590A JPH04207787A JP H04207787 A JPH04207787 A JP H04207787A JP 2338355 A JP2338355 A JP 2338355A JP 33835590 A JP33835590 A JP 33835590A JP H04207787 A JPH04207787 A JP H04207787A
Authority
JP
Japan
Prior art keywords
signal
low
frequency
circuit
brightness
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
JP2338355A
Other languages
Japanese (ja)
Inventor
Yoshitaka Kanemoto
金本 芳孝
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP2338355A priority Critical patent/JPH04207787A/en
Publication of JPH04207787A publication Critical patent/JPH04207787A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To allow cancellation of a primary beat by subjecting a low-pass converted carrier color signal to a phase adjustment by a phase adjusting means, adding this signal to a brightness signal, subjecting this brightness signal to a frequency modulation, adding and synthesizing the signal to and with the above-mentioned carrier color signal and multiplex recording the signals in the same track. CONSTITUTION:The low-pass converted chroma signal outputted by a low-pass filter 24 is supplied via an amplifier 31 to a phase correcting circuit 32 which adds the low-pass converted chroma signal subjected to the phase correction to an adder 3. The low-pass converted chroma signal is added to the brightness signal supplied from a brightness/chroma separating circuit 2 by this adder 3. This brightness signal is supplied to a brightness signal processing circuit after a clamp circuit 4. The brightness signal added with the low-pass converted chroma signal is FM modulated by an FM modulation circuit 7 and the FM modulated signal is added to the low-pass converted chroma signal by an adder 9. The signals are then recorded on a information tape 12. The primary beat generated by the secondary distortion in a recording amplifier 10 is removed in this way.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、VTR等の磁気記録装置に関し、特に低域変
換された搬送波色信号と周波数変調された輝度信号を加
算合成して同一トラックに記録する磁気記録装置に関す
る。
[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic recording device such as a VTR, and in particular, a method for adding and synthesizing a low frequency-converted carrier color signal and a frequency-modulated luminance signal to record them on the same track. The present invention relates to a magnetic recording device for recording.

〔発明の概要〕[Summary of the invention]

本発明は、VTR等の磁気記録装置において、低域変換
された搬送波色信号を位相調整手段により位相調整し、
この位相調整された搬送波色信号を輝度信号に加算し、
この加算された輝度信号を周波数変調して、低域変換さ
れた搬送波色信号と加算合成して同一トラックに多重記
録して、記録系回路の2次歪みで発生する1次ビートを
良好にキャンセルできるようにしたものである。
In a magnetic recording device such as a VTR, the present invention adjusts the phase of a low frequency converted carrier color signal using a phase adjustment means,
This phase-adjusted carrier color signal is added to the luminance signal,
This added luminance signal is frequency-modulated, combined with the low-frequency converted carrier color signal, and multiplexed on the same track, effectively canceling the first-order beat caused by second-order distortion in the recording circuit. It has been made possible.

〔従来の技術〕[Conventional technology]

従来より、磁気テープを記録媒体としてカラー映像信号
の記録再生を行うビデオテープレコーダ(VTR)では
、カラー映像信号を直接周波数変調(FM:frequ
ency modulation) シて記録する直接
FM記録方式以外に、色副搬送波周波数を取り扱いの容
易な低い周波数に低域変換して、搬送波色信号を輝度信
号とともに同一トラックに記録するいわゆるクロマ低域
変換記録方式として、色副搬送波周波数が低域変換され
た搬送波色信号を輝度信号に混合した上で周波数変調し
て記録する方式や、色副搬送波周波数が低域変換された
搬送波色信号と周波数変調された輝度信号とを加算合成
して多重記録する方式等が採用されている。
Traditionally, video tape recorders (VTRs) that use magnetic tape as a recording medium to record and play back color video signals have been using direct frequency modulation (FM) to directly frequency modulate the color video signals.
In addition to the direct FM recording method in which the color subcarrier frequency is low-band-converted to a low frequency that is easy to handle, so-called chroma low-band conversion recording is in which the carrier color signal is recorded on the same track along with the luminance signal. As a method, there is a method in which a carrier color signal whose color subcarrier frequency is low band converted is mixed with a luminance signal and then frequency modulated and recorded, and a method in which the color subcarrier frequency is frequency modulated with a carrier color signal whose color subcarrier frequency is low band converted. A method has been adopted in which multiplex recording is performed by adding and synthesizing the luminance signals.

〔発明が解決しようとする課題] ところで、このように色信号を低域変換して記録するよ
うにすると、記録時の記録アンプでの2次歪みにより、
磁気テープに記録される映像信号に1次ビートが発生し
てしまう。即ち、第4図に示すように、搬送波周波数f
cに低域変換された搬送波色信号を、中心周波数fyの
輝度信号に混合し、磁気テープの同一トラックに記録し
た場合、輝度信号fyの上下の周波数帯に1次ビート成
分(fythfC)が発生する。
[Problems to be Solved by the Invention] By the way, when the color signal is low-frequency converted and recorded in this way, due to second-order distortion in the recording amplifier during recording,
A primary beat occurs in the video signal recorded on the magnetic tape. That is, as shown in FIG.
When a carrier color signal that has been low-pass converted to c is mixed with a luminance signal of center frequency fy and recorded on the same track of a magnetic tape, a primary beat component (fythfC) is generated in the frequency band above and below the luminance signal fy. do.

この1次ビートが発生すると、記録された映像信号の再
生画質が劣化してしまう不都合があった。
When this primary beat occurs, there is an inconvenience that the reproduced image quality of the recorded video signal deteriorates.

ここで、この記録アンプでの2次歪みにより1次ビート
が発生することを弐で説明すると、まず輝度信号Yとク
ロマ信号(色信号)Cは、次式で示される。この場合、
次式は角周波数で示される式である。
Now, to explain the fact that a first-order beat occurs due to second-order distortion in this recording amplifier, first, a luminance signal Y and a chroma signal (color signal) C are expressed by the following equation. in this case,
The following equation is expressed in terms of angular frequency.

輝度信号 Y=A CO3(Ll 、t     ++
 ・・(1)クロマ信号c=E3cosωct・・・・
(2)そして、記録アンプでは、両信号が加算されたも
のを処理するので、記録アンプ入力は次式のようになる
Luminance signal Y=A CO3(Ll,t++
...(1) Chroma signal c=E3cosωct...
(2) Since the recording amplifier processes the sum of both signals, the recording amplifier input is as shown in the following equation.

Y+C=A cosω、t +B cosωet  −
43)ここで、伝送系に2次歪みがあると、この2次歪
みは(Y+C)”で考えることができるので、次式で示
される。  − (Y 十C) ” = −cos 2ωyt+ A B
 1cos(ωアーωc)t+AB −cos(ω、−
+−ωc)t  ・−・−(4)この(4)式において
、A B −C03((13,−ωc)t+AB −c
os(ω、+ωc”)t  が第4図に示した1次ビー
ト成分(fy±fc)である。
Y+C=A cosω, t+B cosωet −
43) Here, if there is second-order distortion in the transmission system, this second-order distortion can be considered as (Y+C)'', so it is expressed by the following formula: − (Y 1C) ” = −cos 2ωyt+ A B
1cos(ω,-cos)t+AB-cos(ω,-
+-ωc)t ・-・-(4) In this equation (4), A B −C03((13,-ωc)t+AB −c
os(ω, +ωc'')t is the primary beat component (fy±fc) shown in FIG.

本発明の目的は、簡単な構成で記録時にこの1次ビート
成分を除去できるようにすることにある。
An object of the present invention is to make it possible to remove this primary beat component during recording with a simple configuration.

〔課題を解決するための手段〕[Means to solve the problem]

本発明の磁気記録装置は、例えば第1図に示す如く、低
域変換された搬送波色信号と周波数変調された輝度信号
を加算合成して同一トラックに記録する磁気記録装置に
おいて、低域変換された搬送波色信号を位相調整手段(
32)により位相調整し、この位相調整された搬送波色
信号を加算器(3)で輝度信号に加算し、この加算され
た輝度信号を周波数変調して、低域変換された搬送波色
信号と加算合成して同一トラックに多重記録するように
したものである。
As shown in FIG. 1, for example, the magnetic recording device of the present invention is a magnetic recording device that adds and combines a low-frequency-converted carrier chrominance signal and a frequency-modulated luminance signal and records them on the same track. The phase adjustment means (
32), the phase-adjusted carrier color signal is added to the luminance signal in an adder (3), the added luminance signal is frequency modulated, and added to the low frequency converted carrier color signal. It is designed to combine and multiplex record on the same track.

〔作用〕[Effect]

このように位相調整された搬送波色信号を輝度信号に加
算することで、記録アンプでの2次歪みによる1次ビー
ト成分が除去され、1次ビート成分が除去された良好な
映像信号が磁気テープに記録される。
By adding the phase-adjusted carrier color signal to the luminance signal, the first-order beat component due to second-order distortion in the recording amplifier is removed, and a good video signal from which the first-order beat component has been removed is transferred to the magnetic tape. recorded in

〔実施例〕〔Example〕

以下、本発明の一実施例を、第1図〜第3図を参照して
説明する。
Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 3.

第1図において、(1)は複合映像信号入力端子を示し
、この入力端子(1)には記録されるベースバンドの複
合カラー映像信号が供給される。そして、入力端子(1
)に得られるベースバンドの複合映像信号を、輝度・ク
ロマ分離回路(2)に供給し、この輝度・クロマ分離回
路(2)で輝度信号とクロマ信号(色副搬送波周波数3
.58MHz)とに分離する。そして、分離された輝度
信号を後述する加算器(3)を介してクランプ回路(4
)に供給し、このクランプ回路(4)でクランプされた
輝度信号をプリエンファシス回路(5)に供給する。こ
のプリエンファシス回路(5)は、ホワイトクリップ処
理等のクリップ処理を行うクリップ回路(6)が接続さ
れ、所定のプリエンファシス処理を行う。そして、プリ
エンファシス回路(5)が出力する輝度信号を、周波数
変調回路(以下FM変調回路と称する)(7)に供給し
、記録のためのFM変調を行い、FM変調された輝度信
号をバイパスフィルタ(8)を介して加算器(9)に供
給する。
In FIG. 1, (1) indicates a composite video signal input terminal, and a baseband composite color video signal to be recorded is supplied to this input terminal (1). Then input terminal (1
) is supplied to the luminance/chroma separation circuit (2), which separates the luminance signal and chroma signal (color subcarrier frequency 3
.. 58MHz). The separated luminance signal is then sent to a clamp circuit (4) via an adder (3), which will be described later.
), and the luminance signal clamped by this clamp circuit (4) is supplied to a pre-emphasis circuit (5). This pre-emphasis circuit (5) is connected to a clip circuit (6) that performs clip processing such as white clip processing, and performs predetermined pre-emphasis processing. The luminance signal output from the pre-emphasis circuit (5) is then supplied to a frequency modulation circuit (hereinafter referred to as FM modulation circuit) (7) to perform FM modulation for recording, bypassing the FM modulated luminance signal. It is supplied to an adder (9) via a filter (8).

また、輝度・クロマ分離回路(2)で分離された色副搬
送波周波数3.58MHzのクロマ信号を、自動色補正
回路(21)に供給し、この自動色補正回路(21)で
補正されたクロマ信号を周波数変換回路(22)に供給
する。そして、発振器(23)が出力する周波数信号を
周波数変換回路(22)に供給し、この周波数信号をク
ロマ信号に混合して、3.58MHzのクロマ信号を7
32.422k)lzの低域周波数に変換する。そして
、低域変換されたクロマ信号を、ローパスフィルタ(2
4)を介して加算器(9)に供給する。
In addition, the chroma signal with a color subcarrier frequency of 3.58 MHz separated by the luminance/chroma separation circuit (2) is supplied to the automatic color correction circuit (21), and the chroma signal corrected by the automatic color correction circuit (21) is The signal is supplied to a frequency conversion circuit (22). Then, the frequency signal output from the oscillator (23) is supplied to the frequency conversion circuit (22), and this frequency signal is mixed with the chroma signal to convert the 3.58 MHz chroma signal to 7.
32.422k) lz low frequency. Then, the low-pass converted chroma signal is filtered through a low-pass filter (2
4) to the adder (9).

そして、この加算器(9)でバイパスフィルタ(8)側
から供給される輝度信号とローパスフィルタ(24)側
から供給されるクロマ信号とを混合し、混合信号を記録
アンプ(10)に供給する。そして、この記録アンプ(
10)で増幅された混合信号を磁気ヘッド(11)に供
給し、磁気テープ(12)に記録する。
Then, the adder (9) mixes the luminance signal supplied from the bypass filter (8) side and the chroma signal supplied from the low-pass filter (24) side, and supplies the mixed signal to the recording amplifier (10). . And this recording amplifier (
The mixed signal amplified in step 10) is supplied to a magnetic head (11) and recorded on a magnetic tape (12).

ここで本例においては、ローパスフィルタ(24)が出
力する低域変換されたクロマ信号を、アンプ(31)を
介して位相補正回路(32)に供給し、位相補正された
低域変換クロマ信号を加算器(3)に供給する。そして
、この加算器(3)で輝度・クロマ分離回路(2)から
供給される輝度信号に低域変換されたクロマ信号を加算
し、この低域変換されたクロマ信号が加算された輝度信
号を、上述したクランプ回路(4)以降の輝度信号処理
回路に供給する。そして、この低域変換されたクロマ信
号が加算された輝度信号をFM変調回路(7)でFM変
調し、FM変調信号を加算器(9)で低域変換されたク
ロマ信号と加算して磁気テープ(12)に記録する。
In this example, the low-frequency converted chroma signal output from the low-pass filter (24) is supplied to the phase correction circuit (32) via the amplifier (31), and the phase-corrected low-frequency converted chroma signal is is supplied to the adder (3). Then, the adder (3) adds the low frequency converted chroma signal to the brightness signal supplied from the brightness/chroma separation circuit (2), and the brightness signal to which the low frequency converted chroma signal is added is obtained. , is supplied to the luminance signal processing circuits subsequent to the above-mentioned clamp circuit (4). Then, the luminance signal to which the low frequency converted chroma signal is added is subjected to FM modulation in the FM modulation circuit (7), and the FM modulation signal is added to the low frequency converted chroma signal in the adder (9) to generate a magnetic signal. Record on tape (12).

なお、アンプ(31)は反転アンプ等の位相合わせを行
うアンプで、周波数変換回路(22)やローパスフィル
タ(24)の構成によっては、必要ない場合もある。ま
た、位相補正回路(32)は、クランプ回路(4)から
バイパスフィルタ(8)までの輝度信号処理に要する時
間に相当する位相補正を行うものである。
Note that the amplifier (31) is an amplifier that performs phase matching such as an inverting amplifier, and may not be necessary depending on the configuration of the frequency conversion circuit (22) and the low-pass filter (24). Further, the phase correction circuit (32) performs phase correction corresponding to the time required for luminance signal processing from the clamp circuit (4) to the bypass filter (8).

ここで第2図に、ローパスフィルタ(24)が出力する
低域変換されたクロマ信号を、輝度信号に加算する構成
の一例を示すと、輝度・クロマ分離回路(2)が出力す
る輝度信号を、コンデンサC3と抵抗器R0との直列回
路を介してクランプ回路(4)に供給する。そして、ロ
ーパスフィルタ(24)が出力する低域変換されたクロ
マ信号を、出力端子(24a)から加算器(9)側に供
給すると共に、抵抗器R1とコンデンサC0との直列回
路に供給する。そして、コンデンサC0の他端をクラン
プ回路(4)の入力側と接続し、抵抗器RIとコンデン
サC0とを介して低域変換されたクロマ信号をクランプ
回路(4)側に供給し、クランプ回路(4)に供給され
る輝度信号に低域変換されたクロマ信号を加算する。こ
の場合には、抵抗器R,,R,とコンデンサC0とで位
相補正回路(32)が構成される。
Here, FIG. 2 shows an example of a configuration in which the low-pass-converted chroma signal output from the low-pass filter (24) is added to the luminance signal. , is supplied to the clamp circuit (4) via a series circuit of capacitor C3 and resistor R0. Then, the low-pass converted chroma signal outputted by the low-pass filter (24) is supplied from the output terminal (24a) to the adder (9) side and also to the series circuit of the resistor R1 and the capacitor C0. Then, the other end of the capacitor C0 is connected to the input side of the clamp circuit (4), and the low frequency converted chroma signal is supplied to the clamp circuit (4) side via the resistor RI and the capacitor C0. (4) Add the low-frequency converted chroma signal to the luminance signal supplied to step (4). In this case, a phase correction circuit (32) is constituted by resistors R, , R, and capacitor C0.

このようにして、低域変換されたクロマ信号をFM変調
される前の輝度信号に加算することで、記録アンプ(1
0)での2次歪みにより発生する1次ビートが除去され
る。即ち、上述した第4図に示す輝度信号f、の上下の
周波数帯に発生する1次ビート成分(f、±fc)が、
低域変換されたクロマ信号の加算でキャンセルされ、1
次ビート成分が抑圧される。第3図は、本例の回路によ
る1次ビート成分の除去状態を示す図で、第3図Aに示
す1次ビート成分が、低域変換されたクロマ信号の加算
で、第3図Bに示すように抑圧されて除去される。
In this way, by adding the low frequency converted chroma signal to the luminance signal before FM modulation, the recording amplifier (1
The first-order beat caused by the second-order distortion at 0) is removed. That is, the primary beat component (f, ±fc) generated in the frequency band above and below the luminance signal f shown in FIG.
It is canceled by adding the low-frequency converted chroma signal, and 1
The next beat component is suppressed. FIG. 3 is a diagram showing the state in which the primary beat component is removed by the circuit of this example. The primary beat component shown in FIG. 3A is changed to FIG. It is suppressed and removed as shown.

〔発明の効果] 本発明によると、位相調整された搬送波色信号を変調さ
れていない輝度信号に加算することで、記録アンプでの
2次歪みによる1次ビートが除去され、1次ビート成分
の影響のない良好な映像信号の記録・再生ができる。こ
の場合、記録される輝度信号自体を処理するものではな
いので、記録される輝度信号自体が劣化することがなく
、記録される映像信号の再生画質が劣化することはない
[Effects of the Invention] According to the present invention, by adding a phase-adjusted carrier color signal to an unmodulated luminance signal, the first-order beat due to second-order distortion in the recording amplifier is removed, and the first-order beat component is It is possible to record and play back good video signals without any effects. In this case, since the recorded luminance signal itself is not processed, the recorded luminance signal itself does not deteriorate, and the reproduced image quality of the recorded video signal does not deteriorate.

また、搬送波色信号を位相調整して加算するだけの簡単
な構成で実現できる。
Moreover, it can be realized with a simple configuration that only requires adjusting the phase of the carrier color signal and adding it.

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

第1図は本発明の一実施例を示す構成図、第2図は一実
施例の要部を示す構成図、第3図は1次ビートの除去状
態を示す波形図、第4図は1次ビートの発生状態を示す
特性図である。 (1)は複合映像信号入力端子、(2)は輝度・クロマ
分離回路、(11)は磁気ヘッド、(12)は磁気テー
プ、(31)はアンプ、(32)は位相補正回路である
Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a block diagram showing main parts of the embodiment, Fig. 3 is a waveform diagram showing a state in which the primary beat is removed, and Fig. FIG. 3 is a characteristic diagram showing a state in which a next beat occurs. (1) is a composite video signal input terminal, (2) is a brightness/chroma separation circuit, (11) is a magnetic head, (12) is a magnetic tape, (31) is an amplifier, and (32) is a phase correction circuit.

Claims (1)

【特許請求の範囲】  低域変換された搬送波色信号と周波数変調された輝度
信号を加算合成して同一トラックに記録する磁気記録装
置において、 低域変換された搬送波色信号を位相調整手段により位相
調整し、この位相調整された搬送波色信号を輝度信号に
加算し、この加算された輝度信号を周波数変調して、低
域変換された搬送波色信号と加算合成して同一トラック
に多重記録することを特徴とする磁気記録装置。
[Claims] In a magnetic recording device that adds and combines a low-frequency-converted carrier color signal and a frequency-modulated luminance signal and records the resultant signal on the same track, the phase of the low-frequency-converted carrier color signal is adjusted by a phase adjustment means. This phase-adjusted carrier color signal is added to the luminance signal, and the added luminance signal is frequency-modulated, added and combined with the low-frequency converted carrier color signal, and multiplexed on the same track. A magnetic recording device characterized by:
JP2338355A 1990-11-30 1990-11-30 Magnetic recorder Pending JPH04207787A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2338355A JPH04207787A (en) 1990-11-30 1990-11-30 Magnetic recorder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2338355A JPH04207787A (en) 1990-11-30 1990-11-30 Magnetic recorder

Publications (1)

Publication Number Publication Date
JPH04207787A true JPH04207787A (en) 1992-07-29

Family

ID=18317375

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2338355A Pending JPH04207787A (en) 1990-11-30 1990-11-30 Magnetic recorder

Country Status (1)

Country Link
JP (1) JPH04207787A (en)

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