Ulllted States Patent [19] [11] Patent Number: 6,038,095

2 _ 3 j US006038095A Ulllted States Patent [19] [11] Patent Number: 6,038,095 Ohgaki et al. [45] Date of Patent: Mar. 14, 2000 [54] SIGNAL REPRODUCING APPARATUS [56] References Cited [75] Inventors: Hiroshi Ohgaki, Yokohama; Yasutaka U_S_ PATENT DOCUMENTS Sasajima, Yokosuka, both of Japan 5,420,731 5/1995 Thomas et al...... 360/7713 [73] Assignee: Victor Company of Japan, Ltd., Yokohama, Japan Primary Examiner Muhammad Edun Attorney, Agent, or Firm Eugene Lieberstein; Michael N. [21] Appl. No.: 09/027,099 Meller [22] Filed: Feb. 20, 1998 [57] ABSTRACT Related US Application Data A signal reproducing apparatus realizes an auto-tracking in reproducing a plurality of recorded signals simultaneously [62] Division of application No. 08/245,479, May 17, 1994, With a Simple Construction The Signal reproducing appara abandoned, which is a continuation of application No. tus is featured by comprising a plurality of reproducing 08/622913: Mar- 27: 1996: Pat NO- 5793557 circuits for reproducing a plurality of recorded signals from [30] Foreign Application Priority Data a plurality Of tracks TQl, TQZ, TPl, TPZ, TAl and TAZ formed on a recording medium, a plurality of amplitude May 17, 1993 [JP] Japan..... 5-139061 level detection Circuits for detecting amplitudes of at least lgaty g llapan ' ' ' ' ' ' ' ' ' ' " two of output signals of the reproducing circuits and an C apan ' ' ' ' ' ' ' ' ' ' " _ operation circuit for generating a tracking control signal Feb. 15, 1994 [JP] Japan..... 6-040503 from a Signal Obtained by processing the amplitude level [ l 51 Int. Cl.7..... GllB 5/584 detection signals from the amplitude level detection circuits [52] US. Cl...... 360/7713; 360/55 in a predetermined manner' [58] Field of Search..... 360/7713, 64, 360/61, 23.05, 23.08, 55 1 Claim, 23 Drawing Sheets /WPl 10 i4 l6 /l8 T\ P2 fw P A H 5w 154 1ST REPR PROCESS Y _ P A 12 PB F. /WQl P A 1550 REPR - > :5"- ; 2ND PR /WQ2-13 15 5w PROCESS MULTI 3 24 19 20 51 \ 2 < s 5 i 2 4 G J 200 35S a 230 RECT ltg 5 LIMITER 5 To CAPSTAN /21 220 352G \ SERVO SYSTEM RECT ltg i LIMITER 22/ 32/ OPE I I : ; /WA1 P A 125 22770 28 1 SOUND SIG /WA2 P A 26 sw I 3RD REPR PROCESS OUTPUT SYSTEM 1 I I I : 29 ITG /30 AUDIO 1 LEVEL Q3311 ;, RECT I DETECTOR 1 3 O 0 J

U.S. Patent Mar. 14,2000 Sheet 1 0f 23 6,038,095 Fig.1 PRIOR ART LINEAR SOUND TRACK Y CONTROL TRACK TAPE TRAVELING DIRECTIHN F1322 PRIOR ART Tl L 21 U (,A A MM P \ 5.l 2 (l/ m \ 6 J 38/ \6 O E L O T ER m %\7 RP 4 P 7 G 4 0

U.S. Patent Mar. 14,2000 Sheet 2 0f 23 6,038,095 Fig.3 PRIOR ART LINEAR SOUND TRACK PHELD 1- F\ELD CONTROL TRACK _L 4! TAPE TRAVELING DIRECTION

U.S. Patent Mar. 14,2000 Sheet 4 0f 23 6,038,095 F1.5 d TRACKING CONTROL SIGNAL LEVEL

U.S. Patent Mar. 14,2000 Sheet 5 0f 23 6,038,095 Fi.6 E>mI _<zo_m kwalgmsz (UP TO 52) \ ; Y TRACKING CONTROL SIGNAL LEVEL Fi.7 I Z4 (UP TO s2) TRACKING CONTROL SIGNAL LEVEL

U.S. Patent Mar. 14,2000 Sheet 6 0f 23 6,038,095 F 1' g. 8 SI START 52 < S9 S3 S4 TRCK LEV RED DET SIG RED?UCED YES TRCK LEV INC SIO TRCK-LEV INC DET SIG REDUCED 7 LYES f TRCK I_EV RED NO V 55 S6 EXECUTE REV MAX MAX DET SIG RYEVSD EXECUTE REV MAX S7 DET SIG REDUCED 38 YES TRCK RANGE Y DET DET SIG REDLTICED t TRCK RANGE X DET S16 \ DETM OF TRCK VAL (X+Y)/2

U.S. Patent Mar. 14,2000 Sheet 7 0f 23 6,038,095 Zia m8 R_\ 8m? 3 g 25 A 8E 9K1 93k w: E 291 < m 7 > E5 9: w mm; 11%; v J w Do: 3: 52: F W300i TIE 53/; all :1 5: 2 om:\ \mh < m ma mmmm 1.; 389: / am: 0 No; A' N: v W 3: w V J V 301 52m 55$ 05% v 55 1H mi < m 01% < m

U.S. Patent Mar. 14, 2000 Sheet 10 0f 23 6,038,095 Fig.I2(A) n40 Fig.12(B) 1150 Fig.I2(c) 125C Fig.I2(D) H90 Fig.I2(E) 1250 Fig.12(F) 126b Fig.12(e)125d 41 JL

U.S. Patent Mar. 14,2000 Sheet 11 0f 23 6,038,095 MAG Fig-13(A) TAPE TRAVELING TPI TQI TAI TPI TQI _> LT02 TAZ TPZ TOZ TA2 DIRECCIION \\\\\ /////\\\\ \\\\\///// \\ // 2 D m 2% 9. E HEADS IZ DIRECTION WP1 WP2 OF WAZ [X] HEAD SCAN WAI Fig.13( B) M K O E I "NOISE LEvEL 5 >HEAD POSITION Fig.13( C) O /C\C1 N N2 I i -HEAD POSITION Fig.I3(D) --NO SE LEVEL -- NOISE LEVEL 0 PRES/E;\LPREDETERMINED PRESET TRACKING : FRAME PERIOD +ITRACKING POSITION 1 IPOSITION >HEAD POSITION

U.S. Patent Mar. 14,2000 Sheet 12 0f 23 6,038,095 928/ 2523 E 55% 03mm m: E 4.03% > i5 AV : ml; 5 5 Q 62 EM; QZN W 5 we; 26 \ 2\ Al i 5 < a 859: (Q \ 0 38 5 ON 2n SN W AM 5:23 5m; 0: W v V 3m w m 5:2: 0: p 5mm w mnno 52w my mm _m own cum l < a 3: T \ $89: \w < n_

U.S. Patent Mar. 14,2000 Sheet 13 0f 23 6,038,095 Fig.I5(A) - l l I l ff] gg D_E_' '_UMITER h LEVEL >HEAD POSITION F1'g.I5(B) 951010055 LEVEL Fig. 15(6) 112 ->-HEAD POSITION 0 V /- - '_\ PRESET PREDETERMINED PRESET TRACKING FRAME PERIOD,TRACK'NG POSITION 5 :POSITION ' >HEAD POSITION

U.S. Patent Mar. 14,2000 Sheet 15 0f 23 6,038,095 Fi.17(A) 001 bb?oz ->HEAD POSITION ---NOlSE LEVEL I kk1 Fig.17(C) 5 *HEAD POSITION -NO SE LEVEL O / 1 >HEAD POSlTlON PRESET TRACK'NG FRAME PERIOD POSlTION ; PPREDETERMINED Fig.1? (D) 1 O >HEAD POSITION

U.S. Patent Mar. 14,2000 Sheet 16 0f 23 6,038,095 S17 S18 S19 F1'g.I8 ( START ) S25 \ TRCK LEV RED DET SIG REDUCED YES AUD\O LEVEL DETECTED k TRC < LEV inc DET SIG REDUCED 520 YES MAX DET \ s0; REVSD TRCK LEV INC 829 YES 821 \ EXECUTE MAX DET REV MAX SIG R7EVSD s YE S30 DET SIG \\ EXECUTE REDUCED REV MAX 531 YES 523 \ TRCK RANGE DET SIG REDUCED 524 S32 X DET \ K DETM OF TRCK TRCK RANGE Y DET VAL (X+Y)/2

U.S. Patent Mar. 14, 2000 Sheet 17 0f 23 6,038,095 @200 ohm EN) 023 266 (m3 QTMPR 2% 2m 5E 2 _ imz?u \A \L N an 31 > < @ A mm 25% I; E am w.. l 830% E < m < m 7 Alll/ IE Em 2 5% N. > 5 i Amlamumv E \/ 8805 C < m WEN mm goal ntm.52.55 _ a 1 L 281 582 2 u n SN cm 82 QNN E mm _ w 5:23 m m M 6.02. u Q: _ o w 5mm " 55% 05% _ 6% o: / /_ / 1---] iii 5m M50 53:

U.S. Patent Mar. 14, 2000 Sheet 18 0f 23 6,038,095 230 F1' 5. 2 0 I p c, Fig.2] TRACI<ING C0NTR0L signal LEVEL Y' TRACKING C0NTR0L SIGNAL LEVEL TRACKING CONTROL SIGNAL LEVEL

U.S. Patent Mar. 14, 2000 Sheet 19 0f 23 6,038,095 S201 F1'8'.Z3 ( START ) S209 K TRCK LEV RED S202 DET s10 REDUCED $205 YES SYNC SIG DETECTED 5210 S211 \\ TRCK-LEV INC YES \ TRCK LEV RED S212 S204 YES MAX DET \ s10 REVSD TRCK-LEV INC Y 5215 YES \ EXECUTE REV MAX EXECUTE REv MAX 8215 DET SIG REDUCED 5207, \ TRCK RANGE DET SIG NO X DET S208 YES REDUCED \ TRCK RANGE \\ DETM OF TREK Y DET VAL (X+Y)/2 {EDD}