JPS6399337U

JPS6399337U -

Info

Publication number: JPS6399337U
Application number: JP19367186U
Authority: JP
Priority date: 1986-12-18
Filing date: 1986-12-18
Publication date: 1988-06-28
Anticipated expiration: 2001-12-18
Also published as: JPH0544904Y2

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例によるトラツキング
制御回路の概略構成を示すブロツク図、第２図は
同実施例における主要部の詳細を示す回路構成図
、第３図は同実施例の動作を説明するためのタイ
ミングチヤート、第４図は従来におけるトラツキ
ング制御回路の概略構成を示すブロツク図、第５
図は第４図の動作を説明するためのタイミングチ
ヤート、第６図は磁気テープのパイロツト信号記
録パターンを示す図、第７図はヘツドと記録トラ
ツクとの関係を示す図、第８図は第４図における
主要部の詳細を示す回路構成図である。１……再生アンプ、２……バンドパスフイルタ
、３……絶対値回路、４……ローパスフイルタ、
５，８……サンプルホールド回路、６……加算回
路、７……反転アンプ、１１……クランプ回路、
Ａ１〜Ａ５，Ａ１０……オペアンプ、ＳＷ１，Ｓ
Ｗ２……スイツチング素子。 FIG. 1 is a block diagram showing a schematic configuration of a tracking control circuit according to an embodiment of the present invention, FIG. 2 is a circuit diagram showing details of the main parts of the embodiment, and FIG. 3 shows the operation of the embodiment. FIG. 4 is a timing chart for explanation; FIG. 4 is a block diagram showing a schematic configuration of a conventional tracking control circuit; FIG.
4 is a timing chart for explaining the operation of FIG. 4, FIG. 6 is a diagram showing the pilot signal recording pattern of the magnetic tape, FIG. 7 is a diagram showing the relationship between the head and the recording track, and FIG. FIG. 4 is a circuit configuration diagram showing details of the main parts in FIG. 4; 1...Reproduction amplifier, 2...Band pass filter, 3...Absolute value circuit, 4...Low pass filter,
5, 8...Sample hold circuit, 6...Addition circuit, 7...Inverting amplifier, 11...Clamp circuit,
A1-A5, A10... operational amplifier, SW1, S
W2...Switching element.

Claims

[Scope of utility model registration request]

The recording signal is obliquely recorded on the track by a rotating head without a guard band, and a pilot signal for tracking is recorded on a part of the track, and most of the recording positions of this pilot signal are on three consecutive lines. In a reproducing apparatus for reproducing a magnetic tape recorded in such a way that the tracks do not overlap each other when viewed in a direction orthogonal to the head scanning direction, using a rotary head having a gap width wider than the recording track width, a bandpass filter for selecting the pilot signal from the signals; and envelope detection means for detecting an envelope component of the output of the bandpass filter;
A clamp circuit clamps the output of the envelope detection means to a reference voltage, a sample hold circuit samples and holds the output signal of this clamp circuit, and outputs it as a tracking error signal, and a rotating head detects the tracking error signal during playback of a predetermined track. The clamp circuit is operated when the pilot signal recording position on one adjacent track is reached, and the sample hold circuit is operated when the pilot signal recording position is reached on the other adjacent track. A tracking control circuit characterized by comprising a control means for controlling.