JPS59168852U

JPS59168852U - Pilot signal selection filter circuit

Info

Publication number: JPS59168852U
Application number: JP6101083U
Authority: JP
Inventors: 裕鈴木; 長島　宏昌; 宮本　幸博
Original assignee: ミツミ電機株式会社
Priority date: 1983-04-22
Filing date: 1983-04-22
Publication date: 1984-11-12

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図は磁気テープの記録パターン、第２図はトラッキ
ングサーボに使用される４種のパイロット信号の周波数
関係、第３図は従来のトラッキングサーボのブロック図
、第４図は２進カウンタ及びマルチプレクサの夫々の出
力関係とフィルタの切換えモード、第５図は従来のフィ
ルタの周波数特性、第６図は本考案の一実施例になるト
ラッキングサーボのブロック図、第７図は本考案になる
フィルタの周波数特性、第８図は本考案になるフィルタ
回路、第９図（ま第７図の変形例を夫々示す。ｆ、、　ｆ２．　ｆ３．　ｆ、・・・パイロット信号、
Ｌｌ・・・コイル、０１〜Ｃ６・・・コンデンサ、３・
・・２進カウンタ、４・・・マルチプレクサ（パイロッ
ト信号選択回路）、５・・・フィルタ、回路、９・・・
ミキサ回路、１０．１２・・・バンドパスフィルタ、１
６・・・切換え回路、１７・・・演算増巾器、Ｓ□、Ｓ
２・・・電子スイッチ。Figure 1 shows the recording pattern of the magnetic tape, Figure 2 shows the frequency relationship of the four types of pilot signals used in the tracking servo, Figure 3 is a block diagram of a conventional tracking servo, and Figure 4 shows the binary counter and multiplexer. Figure 5 shows the frequency characteristics of the conventional filter, Figure 6 is a block diagram of a tracking servo that is an embodiment of the present invention, and Figure 7 shows the filter switching mode of the present invention. Frequency characteristics, Fig. 8 shows the filter circuit according to the present invention, Fig. 9 shows a modification of Fig. 7, respectively. f, f2. f3. f, . . . pilot signal,
Ll...Coil, 01-C6...Capacitor, 3.
... Binary counter, 4... Multiplexer (pilot signal selection circuit), 5... Filter, circuit, 9...
Mixer circuit, 10.12...Band pass filter, 1
6... Switching circuit, 17... Arithmetic amplifier, S□, S
2...Electronic switch.

Claims

[Scope of utility model registration request]

A magnetic recording and reproducing device that performs tracking using pilot signals includes a selection circuit that sequentially selects and outputs pilot signals, a plurality of filter circuits that pass the pilot signals output by the selection circuit, and a plurality of filter circuits that pass the pilot signals output by the selection circuit. A pilot signal and selection filter circuit consisting of a switching circuit that switches between filter circuits.