JPS6095774U

JPS6095774U - magnetic recording and reproducing device

Info

Publication number: JPS6095774U
Application number: JP18724383U
Authority: JP
Inventors: 阪口　潤一; 中庭　浩一; 中瀬　保友
Original assignee: 松下電器産業株式会社
Priority date: 1983-12-02
Filing date: 1983-12-02
Publication date: 1985-06-29
Also published as: JPH0419902Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は従来の３ヘツドヘリカルスキヤン型ＶＴＲの要
部構成図、第２図は第１図のヘッドアンプ出力までの周
波数特性図、第３図は第１図信号再生系の概略構成と要
部周波数特性図、第４図〜第７図は本考案の一実施例を
示し、第４図は本考案によるＶＴＲの要部構成図、第５
図は第４図のヘッドアンプ出力までの周波数特性図、第
６図は第４図信号再生系の概略′構成と要部周波数特性
図、第７図は特殊樽生ヘッド再生系の周波数特性図であ
る。１．２・・・記録再生ヘッド、３・・・スチル・スロー
モード再生専用ヘッド、５，６・・・ヘッドアンプ、８
・・・モード切換用スイッチングトランジスタ、９・・
・ヘッド切換用ス、イッヂ、１１・・・ＡＧＣアンプ、
１２・・−ＦＭイコライザアンプ、２４・・・固定コン
デ　　□ンサ、２５．２６・・・固定抵抗器、２７・・
・可変抵抗器。Figure 1 is a diagram of the main parts of a conventional three-head helical scan VTR, Figure 2 is a frequency characteristic diagram up to the head amplifier output shown in Figure 1, and Figure 3 is a schematic diagram of the signal reproduction system shown in Figure 1 and its main components. 4 to 7 show an embodiment of the present invention, FIG. 4 is a diagram showing the main part of the VTR according to the present invention, and
The figure is a frequency characteristic diagram up to the head amplifier output in Figure 4, Figure 6 is a schematic diagram of the configuration and main part frequency characteristics of the signal reproduction system in Figure 4, and Figure 7 is a frequency characteristic diagram of the special barrel head reproduction system. It is. 1.2... Recording/playback head, 3... Still/slow mode playback dedicated head, 5, 6... Head amplifier, 8
...Mode switching switching transistor, 9...
・Head switching switch, switch, 11...AGC amplifier,
12... -FM equalizer amplifier, 24... Fixed capacitor, 25.26... Fixed resistor, 27...
・Variable resistor.

Claims

[Claims for Utility Model Registration] -1 A normal playback head is connected to the input of a head amplifier having a feedback amount setting resistor, and the resonant frequency of the normal playback head viewed from the input side of the head amplifier is the white clip frequency. The playback frequency characteristic at the head amplifier output is set to be flat near the white clip frequency by setting it higher than FM, and the head amplifier output has a single peak frequency characteristic having a gain peak at a predetermined set frequency below the white clip frequency. In addition to correcting the high frequency range of the playback output using an equalizer amplifier, a resonant frequency setting resistor is connected in parallel with the special playback head, and the feedback amount setting resistor of the head amplifier that processes the signal of the special playback head is set to normal playback mode. and a special reproduction mode resistor connected in parallel to the normal reproduction resistor in synchronization with switching to the special reproduction mode. 2. The magnetic recording according to claim 1 of the utility model registration, characterized in that the resonant frequency determined by a resonant frequency setting capacitor connected in parallel to the special reproduction head is set to a frequency near the white clip frequency. playback device.