JPS63149431U

JPS63149431U -

Info

Publication number: JPS63149431U
Application number: JP4221287U
Authority: JP
Priority date: 1987-03-23
Filing date: 1987-03-23
Publication date: 1988-10-03

Description

[Brief explanation of the drawing]

第１図は本発明の原理ブロツク図、第２図は本
発明の一実施例のブロツク図、第３図は本発明に
よる高速再生時のヘツド走査軌跡の一実施例を示
す図、第４図及び第５図は夫々再生トラツクとパ
イロツト信号記録区間とを示す図、第６図は通常
再生時と本発明による高速再生時の再生パイロツ
ト信号のエンベローブを模式的に示す図、第７図
は通常再生時と本発明による高速再生時の再生信
号のエンベロープを模式的に示す図、第８図はテ
ープパターンの一例を示す図、第９図は従来の高
速再生時の再生信号レベル変化を模式的に示す図
である。１……検波手段、２……トラツキングエラー信
号生成手段、３……制御手段、５……再生信号入
力端子、７……パイロツト信号検波低域フイルタ
、９……エンベローブ検波器、１０，１２……サ
ンプルホールド回路、１４……パルス発生回路、
１５，１６，１８……スイツチ回路、２１……キ
ヤプスタンモータ。 FIG. 1 is a block diagram of the principle of the present invention, FIG. 2 is a block diagram of an embodiment of the present invention, FIG. 3 is a diagram showing an embodiment of the head scanning trajectory during high-speed reproduction according to the present invention, and FIG. 4 5 and 5 are diagrams respectively showing a reproduction track and a pilot signal recording section, FIG. 6 is a diagram schematically showing the envelope of a reproduction pilot signal during normal reproduction and during high-speed reproduction according to the present invention, and FIG. 7 is a diagram showing a normal reproduction A diagram schematically showing the envelope of the reproduced signal during reproduction and during high-speed reproduction according to the present invention, FIG. 8 is a diagram showing an example of a tape pattern, and FIG. 9 is a diagram schematically showing changes in the reproduction signal level during conventional high-speed reproduction. FIG. DESCRIPTION OF SYMBOLS 1...Detection means, 2...Tracking error signal generation means, 3...Control means, 5...Reproduction signal input terminal, 7...Pilot signal detection low-pass filter, 9...Envelope detector, 10, 12 ...Sample hold circuit, 14...Pulse generation circuit,
15, 16, 18... switch circuit, 21... capstan motor.

Claims

[Claim for Utility Model Registration] A recording signal is generated from each track on a magnetic tape in which a digital signal is recorded by being synthesized in time series with a tracking pilot signal by a rotating head at the same tape running speed as when recording. During normal playback, tracking is performed to minimize the difference in the level of the envelope detection signal of the pilot signal, which is reproduced as crosstalk from two tracks on both sides of the track to be played back, and the rotary head converts the digital signal. In a digital signal reproducing device that reproduces a recorded digital signal, during high-speed reproduction in which the rotary head reproduces a recorded digital signal from a recorded magnetic tape running at a tape running speed faster than during normal reproduction, the pilot signal in the reproduced signal is a detection means for performing envelope detection, a first envelope detection signal level of the pilot signal reproduced from the track to be reproduced, and a crosstalk reproduced from a predetermined track adjacent to the track to be reproduced; tracking error signal generating means for generating a tracking error signal according to the difference between the level of the pilot signal and the second envelope detection signal; and control for controlling the scanning locus of the rotary head based on the tracking error signal. A tracking device for a digital signal reproducing apparatus, comprising: means for controlling the tracking so that the tracking deviation of the rotary head becomes zero at a substantially central portion in the longitudinal direction of the track to be reproduced.