公开(公告)号：JPH0660477A

公开(公告)日：1994-03-04

申请号：JP7113393

申请日：1993-03-04

Applicant: SONY CORP

Inventor： KURODA TOSHIYUKI ,  YAMADA MAKOTO ,  KATO FUMIHIKO ,  FUKUDA SHINICHI ,  YAMADA EIICHI

IPC: G11B15/08 ,  G11B15/16 ,  G11B23/30

Abstract: PURPOSE:To surely detect a cassette with a simple constitution by discriminating that the tape cassette is not loaded when the optical output is not detected in a light receiving part. CONSTITUTION:When the cassette 1 is loaded, the light outputted from a tape end detecting means 21S of one side is interrupted by the main body of cassette and not attained to another tape end detecting means 21T. So, when the optical output from the detecting means 21S is not detected by another detecting means 21T, the cassette 1 is decided as in the loaded state. Further, a flickering light L transmitting through a tape-like recording medium 10 drawn out from a reel 5 of supply side is received, and the light received result is detected at the timings of fall and rise of a signal level. The level difference in the obtained light receiving result is converted to a digital value to obtain the detection result of the transmitting light, and similarly the detection result of the transmitting light of the winding take-up side is obtained. The level difference in the detection results of transmitting light at the supply and take-up sides is compared with the comparison reference. Then, a leader tape of the medium 10 is detected with the simple constitution.

公开(公告)号：JPS63228472A

公开(公告)日：1988-09-22

申请号：JP6202787

申请日：1987-03-17

Applicant: SONY CORP

Inventor： IIJIMA TATSUYA ,  NIIFUKU YOSHIHIDE ,  OMORI TAKASHI ,  SATO TAKASHI ,  KURODA TOSHIYUKI

IPC: G11B20/12

Abstract: PURPOSE:To convert and record a bit of information based on a first format to a bit of information based on a second format by detecting the changing point of a bit of first sub-code information with a sub-code information generating means for the first sub-code information excluding TOC information and generating a bit of second sub-code information based on a detecting flag. CONSTITUTION:At sub-code information generating sources 2-5, the first sub- code information including TOC (table of contents) information, namely, corresponding to a CD format is generated, processed by a processing means 9 and based on the output signal, the second sub-code information corresponding to a DAT format is generated by a sub-code information generating means 17. Then, the first sub-code information excluding the TOC information detects the changing point and based on the detecting flag, the second sub-code information is generated. The TOC information is converted to the second sub-code information by the processing means 9 and outputted through the sub-code information generating means 17. In a recording means 8, the second sub-code information is recorded together with a bit of main information.

公开(公告)号：JPH05347053A

公开(公告)日：1993-12-27

申请号：JP17888592

申请日：1992-06-15

Applicant: SONY CORP

Inventor： KURODA TOSHIYUKI ,  YAMADA MAKOTO

IPC: G11B15/473

Abstract: PURPOSE:To enable servocontrol even if an RF signal is not obtained when the servosystem for the revolving speed of a drum using a reproducing clock is adopted. CONSTITUTION:When a reproducing RF signal capable of generating a reproducing clock as revolving speed information is not detected, the control signals for a revolving speed of the drum (23, 24, 25) are generated by utilizing a simplified FG signal generated by the counter electromotive voltage of a drum motor 17 driving the rotation of a head drum 1 as the revolving speed information. When the reproducing clock as the revolving speed information is generated, the control signals for revolving speed of the drum(21, 24, 25) are generated by utilizing the clock signal as the revolving speed information. The servo-control for revolving speed of drum is executed by means of these control signals for revolving speed of the drum.

公开(公告)号：JPH01155507A

公开(公告)日：1989-06-19

申请号：JP31495787

申请日：1987-12-13

Applicant: SONY CORP

Inventor： FUKUDA SHINICHI ,  KURODA TOSHIYUKI

IPC: G11B5/09

Abstract: PURPOSE:To securely attain an action which sequentially obtains information signals that plural magnetic head parts have read without the necessity of cooperation with a detection mechanism in the other level by selectively selecting respective outputs of plural magnetic head parts which sequentially read the information signals from a magnetic recording medium. CONSTITUTION:With detection output signals that can be obtained from a read signal detection part to which respective outputs of plural magnetic head parts 10 and 11 are supplied, the outputs of plural magnetic head parts 10 and 11 in which the information signals that the magnetic recording medium has read are discriminated. A switching control part discriminates the output in which the information signals that the magnetic recording medium 12 has read can be obtained among the outputs of plural magnetic head parts 10 and 11 by the detection output signal obtained from the read signal detection part. The switching control part causes a switching part 20 to operate to fetch the outputs of the magnetic head parts 10 and 11, which are discriminated to be able to obtain the information signals that the magnetic recording medium 12 has read. Thus, the information signals which have been read from the magnetic recording medium 12 are sequentially fetched from the switching part 20.

公开(公告)号：JPH11296985A

公开(公告)日：1999-10-29

申请号：JP9645398

申请日：1998-04-08

Applicant: SONY CORP

Inventor： NOGUCHI MASAYOSHI ,  KURODA TOSHIYUKI ,  ICHIMURA HAJIME ,  YAMAOKA KEISUKE

IPC: G11B20/10 ,  G11B20/12 ,  H03M7/32 ,  H03M13/27 ,  H03M13/22

Abstract: PROBLEM TO BE SOLVED: To provide a recording method and device of digital data being effective for a transmission/recording/reproducing system having an error correcting system of lumped unit, and an interpolation method and a device of effective digital data, and a reproducing method and a device of digital data. SOLUTION: After a recording system 10 encodes recorded data A and B consisting of one bit audio data of Lch and Rch inputted from data input terminals 11, 12 by a recorded data encoder 13 to one channel, applies ECC to this encoded recorded data C by an error correction code circuit 14, and records it in a recording medium 15. the recorded data encoder 13 performs encoding separating Lch and Rch for each unit of error detection being disabled for correction. The ECC circuit 14 performs error correction making a unit lumped in the same time region from the recorded data encoder 13 as an error detection unit.

公开(公告)号：JPH03171402A

公开(公告)日：1991-07-24

申请号：JP31169989

申请日：1989-11-30

Applicant: SONY CORP

Inventor： MARUYAMA KOHEI ,  FUKUDA SHINICHI ,  KURODA TOSHIYUKI

IPC: G11B5/035 ,  H03G5/16 ,  H03H11/04

Abstract: PURPOSE:To select plural filter characteristics by selecting and controlling plural current generating means according to desired filter characteristics. CONSTITUTION:A filter circuit 5 has filter characteristics determined by time constants omega1, omega2...omegan and the current generating means 7A and 7B set time constants omegaA1, omegaA2...omegaAn or omegaB1, omegaB2...omegaBn of integrators GA1, GA2...GAn according to 1st or 2nd filter characteristics generated by the current generating means 7A or 7B. Namely, a selecting means 6 select currents IA1, IA2...IAn or IB1, IB2...IBn according to a control signal CNT and supplies them to the integrators GA1, GA2...GAn. Consequently, the 1st or 2nd filter characteristics can be selected.

公开(公告)号：JPS62165780A

公开(公告)日：1987-07-22

申请号：JP744286

申请日：1986-01-17

Applicant: SONY CORP

Inventor： TAKAHASHI TOSHIHIKO ,  YAMAMOTO YOSHINORI ,  KURODA TOSHIYUKI ,  NIIFUKU YOSHIHIDE

IPC: G11B15/467 ,  G11B15/087 ,  G11B27/19

Abstract: PURPOSE:To detect the moving extent of a tape with a simple constitution even when no CTL signal is recorded by providing a fixed head having the head gap of a slope corresponding to the magnetization pattern of a track and detecting a track crossing the fixed head in response to the tape running. CONSTITUTION:A fixed head FH having a gap G in the same direction as the magnetization pattern of a track TA among tracks TA, TB recorded by heads A, B is provided to the transverse center of a tape T. The head FH crosses the track TA at a period T1 and moves gradually to the track TB, then the output of the hand FH is gradually smaller in the amplitude at the left side of the period T1 toward the right side. On the other hand, an inverted output is obtained at a period T2. This signal is compared with a threshold level via an amplifier, a detection circuit and a waveform shaping circuit and an obtained pulse is counted to detect the moving extent of the tape.

公开(公告)号：JPH05342700A

公开(公告)日：1993-12-24

申请号：JP17153792

申请日：1992-06-08

Applicant: SONY CORP

Inventor： KURODA TOSHIYUKI ,  YAMADA MAKOTO

IPC: G11B15/08 ,  G11B15/16

Abstract: PURPOSE:To quickly execute detection of the presence of a cassette by detecting a light output from a light emitting means with both light receiving means positioned on both sides of a tape-shaped recording medium and detecting the absence of the cassette based on the detected result. CONSTITUTION:An information as to whether the light output L from a light emitting element 21 is detected or not by a light receiving element 22T is usually the information as to whether it is the top of a tape or not. That is, after that an output corresponding to the quantity of light receiving by the element 22T is converted to digital level data by an A/D converter part 37 and a level calculation part 38, whether it is the top of the tape or nor, is detected by a controller part 31 based on the output of a comparator 40. At this time, in the case of detecting the top of the tape or in the case of detecting the end of the tape is in the case that the light L is detected by the light receiving elements 22S and 22T. Therefore, the processing for case where not cassette in loaded, is executed if it is judged that no cassette exists.

公开(公告)号：JPH05314597A

公开(公告)日：1993-11-26

申请号：JP14821092

申请日：1992-05-14

Applicant: SONY CORP

Inventor： YAMADA MAKOTO ,  KURODA TOSHIYUKI ,  NOGUCHI MASAYOSHI

IPC: G11B15/467 ,  G11B15/52

Abstract: PURPOSE:To miniaturize and reduce the cost of the mechanical deck in an R-DAT, etc. CONSTITUTION:The subject device is the reproducing device to reproduce digital data from a magnetic tape 2 in which an address signal is recorded together with the digital data. A reproduction processing circuit 15 to reproduce an original signal from the digital data is provided. A take-up motor 21 to take up a magnetic tape is provided. A circuit 22 (and 30) to detect the rotation cycle of a take-up hub 3T taking up the magnetic tape 2 is provided. A speed control loop to control the rotation of take-up motor 21 so that the rotation cycle of the take-up hub 3T becomes a prescribed value, is provided. A phase control loop to control the rotation of take-up motor 21 so that the changing speed of address signal becomes a standard changing speed regardless of the reproducing position of magnetic tape 2, is provided.