公开(公告)号：BR8904626A

公开(公告)日：1990-04-24

申请号：BR8904626

申请日：1989-09-14

Applicant: IBM

Inventor： CHEN SHIN CHUNG ,  PROVAZEK LIONEL DANIEL

IPC: G11B20/14 ,  H03L7/089 ,  H03M5/12 ,  H03M5/14 ,  G11B20/18

Abstract: A data recovery apparatus comprises means (12) for measuring the phase difference between an input data signal and a reference data clock signal, means (13, 14) responsive to the phase difference to vary the frequency of the reference data clock signal so as to reduce the phase difference, and means for combining the input data signal with the reference data clock signal to produce a standardised output signal. The phase difference measuring means comprises means for producing a control signal indicative of a potentially uncorrectable phase difference error, and means responsive to the control signal for shifting the phase of the input data signal in time relative to the phase of the reference data clock signal before measuring the phase difference.

公开(公告)号：DE68914557T2

公开(公告)日：1994-11-17

申请号：DE68914557

申请日：1989-09-14

Applicant: IBM

Inventor： CHEN SHIN CHUNG ,  PROVAZEK LIONEL DANIEL

IPC: G11B20/14 ,  H03L7/089 ,  H03M5/12 ,  H03M5/14 ,  G11B20/10

Abstract: A data recovery apparatus comprises means (12) for measuring the phase difference between an input data signal and a reference data clock signal, means (13, 14) responsive to the phase difference to vary the frequency of the reference data clock signal so as to reduce the phase difference, and means for combining the input data signal with the reference data clock signal to produce a standardised output signal. The phase difference measuring means comprises means for producing a control signal indicative of a potentially uncorrectable phase difference error, and means responsive to the control signal for shifting the phase of the input data signal in time relative to the phase of the reference data clock signal before measuring the phase difference.

公开(公告)号：DE3751392D1

公开(公告)日：1995-08-10

申请号：DE3751392

申请日：1987-04-10

Applicant: IBM

Inventor： CHAN PATRICK MENG-HO ,  CHEN SHIN CHUNG

IPC: G11B20/14 ,  G11B20/18

Abstract: The width of the data window in a magnetic storage device is controllably varied in order to perform comparative data detection error rate measurements thereon is provided. More particularly, apparatus for obtaining a measure of data detection error in devices for detecting data signals, comprises: first means (9) for producing unambiguously defined timing signals in response to data signals; second means (11, 15) coupled to the first means for producing test signals including pulses having constant width in response to the timing and data signals; third means (15, 17), coupled to the first means, for producing control signals for controlling the width of a test window with respect to the timing signals; and fourth means (18), coupled to the second and third means, for producing a test window by selectively accepting or rejecting test signal pulses in response to the control signals. A continuously variable stressed data window can be generated symmetrically within, and in locked phase with, the full data window under the control of a single current digital-to-analog converter (DAC) in a voltage controlled oscillator (VCO).

公开(公告)号：MX170369B

公开(公告)日：1993-08-18

申请号：MX1750289

申请日：1989-09-11

Applicant: IBM

Inventor： CHEN SHIN CHUNG ,  PROVAZEK LIONEL DANIEL

IPC: G11B20/14 ,  H03L7/089 ,  H03M5/12 ,  H03M5/14 ,  H04N11/02

Abstract: A data recovery apparatus comprises means (12) for measuring the phase difference between an input data signal and a reference data clock signal, means (13, 14) responsive to the phase difference to vary the frequency of the reference data clock signal so as to reduce the phase difference, and means for combining the input data signal with the reference data clock signal to produce a standardised output signal. The phase difference measuring means comprises means for producing a control signal indicative of a potentially uncorrectable phase difference error, and means responsive to the control signal for shifting the phase of the input data signal in time relative to the phase of the reference data clock signal before measuring the phase difference.

公开(公告)号：AU617856B2

公开(公告)日：1991-12-05

申请号：AU4089089

申请日：1989-08-29

Applicant: IBM

Inventor： CHEN SHIN CHUNG ,  PROVAZEK LIONEL DANIEL

IPC: G11B20/14 ,  H03L7/089 ,  H03M5/12 ,  H03M5/14 ,  H03L7/00 ,  H03L7/06 ,  G11B20/10 ,  G11B27/30

Abstract: A data recovery apparatus comprises means (12) for measuring the phase difference between an input data signal and a reference data clock signal, means (13, 14) responsive to the phase difference to vary the frequency of the reference data clock signal so as to reduce the phase difference, and means for combining the input data signal with the reference data clock signal to produce a standardised output signal. The phase difference measuring means comprises means for producing a control signal indicative of a potentially uncorrectable phase difference error, and means responsive to the control signal for shifting the phase of the input data signal in time relative to the phase of the reference data clock signal before measuring the phase difference.

公开(公告)号：DE3751392T2

公开(公告)日：1996-03-07

申请号：DE3751392

申请日：1987-04-10

Applicant: IBM

Inventor： CHAN PATRICK MENG-HO ,  CHEN SHIN CHUNG

IPC: G11B20/14 ,  G11B20/18

Abstract: The width of the data window in a magnetic storage device is controllably varied in order to perform comparative data detection error rate measurements thereon is provided. More particularly, apparatus for obtaining a measure of data detection error in devices for detecting data signals, comprises: first means (9) for producing unambiguously defined timing signals in response to data signals; second means (11, 15) coupled to the first means for producing test signals including pulses having constant width in response to the timing and data signals; third means (15, 17), coupled to the first means, for producing control signals for controlling the width of a test window with respect to the timing signals; and fourth means (18), coupled to the second and third means, for producing a test window by selectively accepting or rejecting test signal pulses in response to the control signals. A continuously variable stressed data window can be generated symmetrically within, and in locked phase with, the full data window under the control of a single current digital-to-analog converter (DAC) in a voltage controlled oscillator (VCO).

公开(公告)号：DE68914557D1

公开(公告)日：1994-05-19

申请号：DE68914557

申请日：1989-09-14

Applicant: IBM

Inventor： CHEN SHIN CHUNG ,  PROVAZEK LIONEL DANIEL

IPC: G11B20/14 ,  H03L7/089 ,  H03M5/12 ,  H03M5/14 ,  G11B20/10

Abstract: A data recovery apparatus comprises means (12) for measuring the phase difference between an input data signal and a reference data clock signal, means (13, 14) responsive to the phase difference to vary the frequency of the reference data clock signal so as to reduce the phase difference, and means for combining the input data signal with the reference data clock signal to produce a standardised output signal. The phase difference measuring means comprises means for producing a control signal indicative of a potentially uncorrectable phase difference error, and means responsive to the control signal for shifting the phase of the input data signal in time relative to the phase of the reference data clock signal before measuring the phase difference.