JPH01133202A - Starting control method for recording amplifier - Google Patents

Abstract

PURPOSE:To improve a picture quality at the time of starting by impressing a recording start instructing signal to a terminal, impressing a head switch signal to another terminal after the impression and outputting a start signal by the leading edge of the head switch signal. CONSTITUTION:A recording amplifier 1 is provided with a starting control terminal 5 to maintain an inoperative state even when a source voltage is impressed from a power source terminal 4. The starting of the amplifier impresses the recording start instructing signal to a first terminal 7 connected to the reset terminal R of a set preceding FF 6. The head switch signal (HSW signal) synchronizing with a recording signal is impressed to a second terminal 8 connected to a set terminal S and a timing for impressing both the signals is specified, thereby, a smooth starting for suppressing the noise of the recording amplifier is realized.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、磁気記録再生装置（ＶＦＲ）に利用される記
録増幅器の起動装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a starting device for a recording amplifier used in a magnetic recording/reproducing apparatus (VFR).

従来の技術 ＶＴＲに利用される従来の記録増幅器は、第３図で示す
ように記録増幅器１に記録信号入力端子２、記録信号出
力端子３および電源端子４が付設された構成であり、電
源端子４から所定の電源電圧が印加されると同時に起動
していた。BACKGROUND ART A conventional recording amplifier used in a VTR has a configuration in which a recording amplifier 1 is provided with a recording signal input terminal 2, a recording signal output terminal 3, and a power supply terminal 4, as shown in FIG. It was activated at the same time that a predetermined power supply voltage was applied from No. 4.

発明が解決しようとする問題点 この様な従来の記録増幅器では、その起動が上記のよう
に電源電圧の印加と同時であり、記録信号とは同期して
いない。このため、記録信号の記録開始がなめらかでな
く、ノイズが入る問題があった。Problems to be Solved by the Invention In such a conventional recording amplifier, its activation is simultaneous with the application of the power supply voltage as described above, and is not synchronized with the recording signal. For this reason, there was a problem that the recording start of the recording signal was not smooth and noise was introduced.

本発明は、このような問題の排除を意図してなされたも
ので、なめらかに記録信号の増幅が開始される記録増幅
器の起動方法の実現を目的とするものである。The present invention has been made with the intention of eliminating such problems, and aims to realize a method for starting a recording amplifier in which amplification of a recording signal is smoothly started.

問題点を解決するための手段 本発明の記録増幅器の起動制御方法の特徴は、磁気記録
再生装置の電源投入状態で電源電圧が印加され、この状
態で非動作状態に保たれる記録増幅器に付設した起動制
御端子に、記録開始指示用信号が第１端子に印加され、
同記録開始指示用信号の印加後に記録信号と同期したヘ
ッドスイッチ信号が第２端子に印加され、ヘッドスイッ
チ信号の１回目の立ち上りエツジで出力端子に起動信号
を出力し、前記記録開始指示用信号の消失で起動信号が
消失する起動制御手段の前記出力端子を接続し、記録増
幅器の起動、停止を制御するところにある。Means for Solving the Problems The recording amplifier start-up control method of the present invention is characterized in that a power supply voltage is applied when the magnetic recording/reproducing device is powered on, and the recording amplifier is kept in an inactive state in this state. A recording start instruction signal is applied to the first terminal of the activated start control terminal,
After applying the recording start instruction signal, a head switch signal synchronized with the recording signal is applied to the second terminal, and at the first rising edge of the head switch signal, a start signal is output to the output terminal, and the recording start instruction signal is The output terminal of the activation control means whose activation signal disappears due to disappearance of the recording amplifier is connected to control activation and deactivation of the recording amplifier.

作用 本発明の起動制御方法によれば、記録増幅器の起動が記
録信号の立ち上りエツジに同期するところとなり、記録
開始がなめらかとなる。Effect: According to the start-up control method of the present invention, the start-up of the recording amplifier is synchronized with the rising edge of the recording signal, resulting in a smooth start of recording.

実施例 以下に図面を参照して本発明の起動制御方法を詳しく説
明する。EXAMPLE The activation control method of the present invention will be explained in detail below with reference to the drawings.

第１図は、本発明の起動制御がなされる記録増幅器と起
動制御手段とを例示した構成図である。FIG. 1 is a configuration diagram illustrating a recording amplifier and startup control means for which startup control is performed according to the present invention.

記録増幅器１は、起動制御端子５が付設されたものであ
り、ＶＴＲの電源投入によって電源端子４から電源電圧
が印加されても非動作状態に保たれている。したがって
、記録信号入力端子２から記録信号が入力されてもこれ
が増幅されて記録信号出力端子３に出力されることはな
い。この記録増幅器１の起動は、セント優先フリップフ
ロップ６のＱ端子の論理レベルがルベル・１”となるこ
とによってなされるが、本発明においては、このセット
優先フリップフロップ６のリセット端子Ｒに繋る第１端
子７に記録開始指示用信号を印加し、また、セット端子
Ｓに繋る第２端子８に記録信号と同期したヘッドスイッ
チ信号（Ｈ３Ｗ信号）を印加するとともに：両信号を印
加するタイミングを特定することによって、記録開始を
なめらかドしている。The recording amplifier 1 is provided with a start-up control terminal 5, and is maintained in a non-operating state even when a power supply voltage is applied from a power supply terminal 4 when the VTR is turned on. Therefore, even if a recording signal is input from the recording signal input terminal 2, it will not be amplified and output to the recording signal output terminal 3. The recording amplifier 1 is activated when the logic level of the Q terminal of the cent priority flip-flop 6 becomes 1", but in the present invention, the logic level of the Q terminal of the set priority flip-flop 6 is connected to the reset terminal R of the set priority flip-flop 6. Applying a recording start instruction signal to the first terminal 7, and applying a head switch signal (H3W signal) synchronized with the recording signal to the second terminal 8 connected to the set terminal S: Timing for applying both signals. By specifying this, recording starts smoothly.

第２図は、上記の動作を説明するタイミングチャートで
ある。図示するように、先ず、時刻ｔ１で第１端子７へ
記録開始指示用信号を印加し、さらにこの時刻から所定
の時間だけ遅れた時刻ｔ２でＨ３Ｗ信号を印加する。こ
の印加タイミングにより、セント優先フリップフロップ
６のリセット端子Ｂとセント端子Ｓの双方が時刻ｔ２で
論理レベルが１”となる。このことによって、記録増幅
器が起動し、記録が開始される。なお、起動期間Ｔは記
録開始指示用信号が消失する時刻Ｔ３で終了する。FIG. 2 is a timing chart explaining the above operation. As shown in the figure, first, a recording start instruction signal is applied to the first terminal 7 at time t1, and then an H3W signal is applied at time t2, which is delayed by a predetermined time from this time. Due to this application timing, the logic level of both the reset terminal B and the cent terminal S of the cent priority flip-flop 6 becomes 1" at time t2. As a result, the recording amplifier is activated and recording is started. The activation period T ends at time T3 when the recording start instruction signal disappears.

ところで、上記の起動とは独立して起動制御を行うこと
ができる機能を付加する必要があるときには、Ｑ端子と
起動制御端子５の間に２人力形のＯＲゲートを設け、一
方の入力端子へＱ端子を接続し、他方の入力端子へ第２
の起動開始指示用信号を印加する構成とすればよい。By the way, when it is necessary to add a function that can perform startup control independently of the above startup, a two-man type OR gate is provided between the Q terminal and the startup control terminal 5, and one input terminal is connected to the other input terminal. Connect the Q terminal and connect the second input terminal to the other input terminal.
The configuration may be such that a signal for instructing the start of activation is applied.

発明の効果 以上の様に、本発明の起動制御方法によれば、記録増幅
器のノイズを抑圧できるなめらかな起動が実現されると
ころとなり、ＶＴＲにおける記録開始時の画質を改善す
る効果が奏される。Effects of the Invention As described above, according to the start-up control method of the present invention, smooth start-up that can suppress recording amplifier noise is realized, and the image quality at the start of recording in a VTR is improved. .

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

第１図は、本発明の起動制御がなされる記録増幅器と起
動制御手段を例示した構成図、第２図は、動作説明のた
めのタイミングチャート、第３図は、従来の記録増幅器
を示す図である。 １・・・・・・記録増幅器、２・・・・記録信号入力端
子、３・・・・・・記録信号出力端子、４・・・・・・
電源端子、６・・・・・起動制御端子、６・・・・・セ
ット優先フリップフロップ、７・・・・・・第１端子、
８・・・・・・第２端子。FIG. 1 is a configuration diagram illustrating a recording amplifier and startup control means for which startup control is performed according to the present invention, FIG. 2 is a timing chart for explaining the operation, and FIG. 3 is a diagram showing a conventional recording amplifier. It is. 1... Recording amplifier, 2... Recording signal input terminal, 3... Recording signal output terminal, 4...
Power supply terminal, 6... Start control terminal, 6... Set priority flip-flop, 7... First terminal,
8...Second terminal.

Claims (2)

【特許請求の範囲】[Claims] （１）磁気記録再生装置の電源投入状態で電源電圧が印
加され、この状態で非動作状態に保たれる記録増幅器に
付設した起動制御端子に、記録開示指示用信号が第１端
子に印加され、同記録開始指示用信号の印加後に記録信
号と同期したヘッドスイッチ信号が第２端子に印加され
、ヘッドスイッチ信号の１回目の立ち上りエッジで出力
端子に起動信号を出力し、前記記録開始指示用信号の消
失で起動信号が消失する起動制御手段の前記出力端子を
接続し、記録増幅器の起動、停止を制御することを特徴
とする記録増幅器の起動制御方法。(1) A power supply voltage is applied when the magnetic recording/reproducing device is powered on, and a recording open instruction signal is applied to the first terminal of the start control terminal attached to the recording amplifier, which is kept in an inactive state in this state. After applying the recording start instruction signal, a head switch signal synchronized with the recording signal is applied to the second terminal, and at the first rising edge of the head switch signal, a start signal is output to the output terminal, and the recording start instruction signal is applied. 1. A method for controlling start-up of a recording amplifier, characterized in that the output terminal of the start-up control means whose start-up signal disappears when the signal disappears is connected to control starting and stopping of the recording amplifier. （２）起動信号が、第１端子をリセット端子、第２端子
をセット端子とするセット優先フリップフロップの出力
であることを特徴とする特許請求の範囲第１項に記載の
記録増幅器の起動制御方法。(2) Start-up control of a recording amplifier according to claim 1, wherein the start-up signal is an output of a set priority flip-flop whose first terminal is a reset terminal and whose second terminal is a set terminal. Method.