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    MAGNETIC REPRODUCING DEVICE
    5.
    发明专利
    MAGNETIC REPRODUCING DEVICE 失效

    公开(公告)号：JPH05128729A

    公开(公告)日：1993-05-25

    申请号：JP31381191

    申请日：1991-10-31

    Applicant: SONY CORP

    Inventor： TAKIZAWA CHIHOKO ,  INOUE HAJIME ,  SEKI TAKAHITO

    IPC: G11B5/09 ,  G11B20/10

    Abstract: PURPOSE:To detect and discriminate the abnormality of the operation state and to take a countermeasure like tap coefficient update stop in accordance with the result by comparing an input signal or an output signal for an adaptive control part with a prescribed reference value or comparing signals in inter- channel corresponding parts of plural channels. CONSTITUTION:An input value discriminating circuit 31 is inserted to the way of the input signal line from a detection characteristic circuit 13 to an adaptive control part 17, and an error signal discriminating circuit 32 is inserted to the way of the error signal line from an adder 16 as an error detector to the control part 17, and a tap coefficient value discriminating circuit 33 is inserted to the way of the tap coefficient signal line from the control part 17 to a digital filter 14. The occurrence of the abnormal state like dropout, noise, or burst error during the reproducing operation is detected by these circuits 31 to 33, and coefficient update is so limited that the tap coefficient is not an abnormal value.

    MAGNETIC REPRODUCING DEVICE
    6.
    发明专利
    MAGNETIC REPRODUCING DEVICE 失效

    公开(公告)号：JPH0549003A

    公开(公告)日：1993-02-26

    申请号：JP22976291

    申请日：1991-08-16

    Applicant: SONY CORP

    Inventor： SEKI TAKAHITO ,  INOUE HAJIME ,  TAKIZAWA CHIHOKO

    IPC: G11B5/09 ,  H04N5/92

    Abstract: PURPOSE:To add a picture processing function to the reproducing device without cost increase and increase in the hardware. CONSTITUTION:The characteristic of a reproducing signal from a magnetic head 11 is compensated 5 a filter 14 being an equalizer and decoded by a decoding circuit 15. An adaptive control function section 17 adjusts (corrects) the characteristic of the filter to be optimum based on a decoding error (residual error) in the decoding circuit 15 and an input to the filter 14. After video signal processing or the like is applied to a signal from the decoding circuit 15, the result is fed to a picture processing detector section 21 for printing a still picture, in which color correction and edge emphasis or the like are implemented to the signal. The adaptive control function section 17 and a picture processing function section 21 are realized by using one and same hardware 20 so as to execute the respective algorithm.

    MAGNETIC REPRODUCING DEVICE
    7.
    发明专利
    MAGNETIC REPRODUCING DEVICE 失效

    公开(公告)号：JPH0540906A

    公开(公告)日：1993-02-19

    申请号：JP21781191

    申请日：1991-08-03

    Applicant: SONY CORP

    Inventor： SEKI TAKAHITO ,  INOUE HAJIME ,  TAKIZAWA CHIHOKO

    IPC: G11B5/09 ,  G11B20/10 ,  H04N5/926 ,  H04N5/931

    Abstract: PURPOSE:To miniaturize the structure of circuits and to reduce a cost by executing adaptive treatment in time division with a filter and an adaptive control part. CONSTITUTION:Reproduced signals from magnetic heads 1A and 1B are arranged in one system through a changeover switch 9 and a reproducing property is compensated by a filter 4 being an equalizer, and thereafter, a demodulating circuit 5 demodulates the signals. The adaptive control part 7 adjusts (corrects) the property of the filter 4 to an optimum value based on a decoding error (residual) in a decoder circuit 5 and an input to the filter 4. The adaptive control part 7 executes the adaptive treatment at every reproduced signal of respective magnetic heads 1A and 1B time divisionally in accordance with a changeover switching pulse SP1 from a terminal 8 and sends filter factors for respective magnetic heads 1A and 1B to the filter 4.

    MAGNETIC REPRODUCING DEVICE
    8.
    发明专利
    MAGNETIC REPRODUCING DEVICE 失效

    公开(公告)号：JP2000149209A

    公开(公告)日：2000-05-30

    申请号：JP2000013736

    申请日：2000-01-24

    Applicant: SONY CORP

    Inventor： TAKIZAWA CHIHOKO ,  INOUE HAJIME ,  SEKI TAKAHITO

    IPC: G11B5/09

    Abstract: PROBLEM TO BE SOLVED: To save a reproduced signal storing memory at the time of an irregular reproduction in a ceramic reproducing device in which two closely arranged magnetic heads having different azimuth angles are used. SOLUTION: This magnetic reproducing device is composed of an FIFO buffer 30 for converting two series of reproducing signals inputted from magnetic heads 13A, 13B into one series of reproducing signals, a level detector 42 which detects a period when a level of reproducing signals becomes a prescribed value or more, and an FIFO writing enable preparing circuit 31E which enables writing into the FIFO buffer 30 during a period when reproduced signals detected with the level detector 42 become a prescribed value or more.

    SYNCHRONOUS CODE EXTRACTION CIRCUIT
    9.
    发明专利
    SYNCHRONOUS CODE EXTRACTION CIRCUIT 失效

    公开(公告)号：JPH06162669A

    公开(公告)日：1994-06-10

    申请号：JP33803592

    申请日：1992-11-25

    Applicant: SONY CORP

    Inventor： KAWANO MASAKI ,  SEKI TAKAHITO ,  TAKIZAWA CHIHOKO

    IPC: G11B20/10 ,  G11B20/14 ,  G11B27/30 ,  H04L7/04 ,  H04L7/08 ,  H04L7/10

    Abstract: PURPOSE:To extract a proper synchronous code even if the synchronous code cannot be detected or is detected erroneously by pattern coincidence detection. CONSTITUTION:The parallel data which are shifted to a normal alignment by a parallel shifter 4 is input to a second pattern coincident circuit 5 and the pattern of two synchronous code bytes is detected. Then, a first synchronous pulse is output to a state machine 8 at a timing when the coincidence is detected and a coincidence flag is output to a gate circuit 6. The gate 6 opens when a state machine 8 is in search mode and then resets a fly wheel counter 7. The fly wheel counter 7 supplies a second synchronous pulse with the cycle of synchronous code to the state machine 8. The state machine 8 outputs the OR of the first and second synchronous pulses as a third synchronous pulse and then outputs a signal indicating the validity of the third synchronous pulse according to the coincidence/non-coincidence of the timing.

    REPRODUCING DEVICE
    10.
    发明专利
    REPRODUCING DEVICE 失效

    公开(公告)号：JPH05206873A

    公开(公告)日：1993-08-13

    申请号：JP4020392

    申请日：1992-01-29

    Applicant: SONY CORP

    Inventor： INOUE HAJIME ,  SEKI TAKAHITO ,  TAKIZAWA CHIHOKO

    IPC: G11B20/18 ,  H03M13/23

    Abstract: PURPOSE:To form a decoding circuit by means of a calculation circuit having a low operation frequency by detecting the transition of input data based on an addition/subtraction result and updating probability data with the addition/ subtraction result. CONSTITUTION:After a certain threshold data TH2 are added/subtracted to/from a preliminarily input data in an addition circuit 20 and a subtraction circuit 18, the output data of the addition circuit 20 and subtraction circuit 18 is subtracted from probability data DELTAk-1 and the subtraction results M+ and M-are detected. The output data of the addition circuit 20 and subtraction circuit 18 are selectively outputted based on the subtraction results M+ and M-, the output data are selectively taken in based on the subtraction results M+ and M-, and the probability data DELTAk-1 are updated. Thus, the updating processing of the probability data DELTAk-1 and the subtraction results M+ and M- can be separately processed and so, the input data yk can be processed at a shorter period so far.

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