公开(公告)号：US3666897A

公开(公告)日：1972-05-30

申请号：US3666897D

申请日：1969-12-17

Applicant: IBM

Inventor： HARR JEROME D

IPC: H04N5/7826 ,  G05D13/62 ,  G11B15/467 ,  G11B27/024 ,  G11B27/32 ,  H02P29/00 ,  G11B5/52

CPC classification number: H02P29/0022 ,  G11B27/024 ,  G11B27/322

Abstract: An elongated tape recording and reproducing system wherein a longitudinal control track is prerecorded on the edge of the tape either with a recording transducer, such as a magnetic head, as part of the system or off-line. After the control track is recorded, oblique video tracks are recorded on the tape with two video transducers or heads spaced 180* apart and traveling obliquely to the recorded control track. During reading of the video information, one obliquely traveling video head reads the address on the longitudinal recorded control track while the other obliquely traveling head reads the video information on the obliquely recorded video track. After the video heads have traveled 180*, their roles are reversed. That is, the video head which was reading the video information on the obliquely recorded track, now reads the address on the longitudinal recorded control track. In addition, the spacings between the address data on the control track serve as servo information for maintaining the tape and video heads in alignment.

Abstract translation: 一种细长的磁带记录和再现系统，其中纵向控制轨道被预先记录在磁带的边缘上，或者使用诸如磁头的记录换能器作为系统的一部分或离线。 在记录控制轨道之后，将倾斜的视频轨道记录在带上的两个视频换能器或间隔开180°的磁头上，并且与记录的控制轨道倾斜地行进。 在读取视频信息期间，一个倾斜行进的视频头读取纵向记录控制轨道上的地址，而另一个斜行头读取在倾斜记录的视频轨道上的视频信息。 视频头角行驶180度后，角色相反。 也就是说，正在读取倾斜记录的轨道上的视频信息的视频头现在读取纵向记录控制轨道上的地址。 此外，控制轨道上的地址数据之间的间隔用作维持磁带和视频磁头对准的伺服信息。

公开(公告)号：CA1014622A

公开(公告)日：1977-07-26

申请号：CA201564

申请日：1974-06-04

Applicant: IBM

Inventor： HARR JEROME D

IPC: H03K5/08 ,  G06K7/10 ,  G06T1/00

Abstract: Significant low frequency noise components in an electric wave, likely to follow larger transient components, are accommodated by automatically adjusting threshold crossing extraction circuitry. Peak component values of each cycle of a wave are stored and used in adjusting the threshold for the succeeding cycle of that wave. The peak level of each mark signal and that of each space signal component is stored by circuitry closely tracking the pertinent changes in the wave envelope. This circuitry is automatically adjusted rapidly at the beginning of each cycle and thus provides control of threshold adjustment without delay under widely varying conditions, such as are encountered in hand scanning of bar coding and the like. Facile circuitry comprises capacitive negative and positive peak tracking and storing circuits interconnected by a resistance divider network from which the threshold value is extracted for application to a signal comparator circuit in which the threshold signal is derived. Output of the comparator circuit is applied to the tracking circuits for arming them. The input signal is differentiated for enabling the tracking and storing circuits alternately in accordance with the sign of the signal wave slope. Reset circuitry is arranged for maintaining operation within the normal range.

公开(公告)号：CA992205A

公开(公告)日：1976-06-29

申请号：CA223384

申请日：1975-03-25

Applicant: IBM

Inventor： HARR JEROME D

公开(公告)号：CA1012645A

公开(公告)日：1977-06-21

申请号：CA156137

申请日：1972-11-10

Applicant: IBM

Inventor： HARR JEROME D

IPC: G02B26/10 ,  G02B27/00 ,  G06K7/10 ,  G06T1/00

公开(公告)号：CA891717A

公开(公告)日：1972-01-25

申请号：CA891717D

Applicant: IBM

Inventor： HARR JEROME D

IPC: G06K9/00 ,  G06K9/38

公开(公告)号：CA1105087A

公开(公告)日：1981-07-14

申请号：CA303023

申请日：1978-05-10

Applicant: IBM

Inventor： HARR JEROME D

IPC: G01R19/04 ,  H03K5/1532

Abstract: PEAK DETECTING CIRCUITRY AND DUAL THRESHOLD CIRCUITRY THEREFOR This peak detecing circuitry avoids false peak indication while using component circuits of smaller dynamic range and lower voltage energizing power supplies than is possible with contemporary circuitry. The electric wave having peaks for which the times of occurrence are desired, is applied between an erecting (non-inverting) input terminal of a differential amplifying circuit and a point of fixed reference potential. A capacitor is connected between the inverting input terminal of the differential amplifier circuit and the reference point. The differential output of the amplifier circuit is applied through individual amplifier circuits to the capacitor for charging and discharging it in accordance with the instantaneous polarity of the electric wave. A unilateral impedor is interposed in the charging circuit in the form of a diode or a transistor for preventing discharge upon reversal of the electric wave slope. Latching and like circuitry is coupled to the detecting circuitry for indicating the detection. An electric connection, preferably including a diode element and/or a resistance element, is arranged between the indicating circuit and the amplifying circuit for dynamically altering the threshold from a high value as the peak of the wave containing noise is approached to a relatively low value as the peak of the wave containing timing information is approached. SA9-77-039 -1-

公开(公告)号：CA909376A

公开(公告)日：1972-09-05

申请号：CA909376D

Applicant: IBM

Inventor： NASSIMBENE ERNIE G ,  PRICE GEORGE E ,  JOHNSON REYNOLD B ,  MARRS RALPH E ,  HARR JEROME D

IPC: C11D1/66 ,  C11D3/37 ,  G06K7/14 ,  G06K9/20

公开(公告)号：CA1096036A

公开(公告)日：1981-02-17

申请号：CA277433

申请日：1977-04-29

Applicant: IBM

Inventor： HARR JEROME D

IPC: G11B5/02 ,  G11B5/03 ,  H03F3/45 ,  H03G3/20

Abstract: DYNAMIC TRANSDUCER BIASING SIGNAL AMPLIFYING CIRCUITRY The ideal response expected of an electromagnetic transducer, particularly of the Magneto-Resistive (M-R) type, obtains with signal translating circuitry for amplifying the varying signal produced and for dynamically biasing the transducer for maintaining the transducing operation in the linear portions of the characteristics of both the transducer and the amplifying circuitry. An M-R transducer is connected to the input circuit of alternating signal differential amplifying circuitry for delivering the desired signal at output terminals. The offset voltage across the transducer is compensated by differentially biasing input transistors of the amplifying circuitry. Biasing direct current through the M-R transducer is controlled by a circuit connected to the output terminal and responsive to the signal thereat for developing a slowly inversely varying unidirectional voltage, preferably within a low pass filter interposed in the control circuit for stability. A current handling device, conveniently a transistor having the control voltage applied to a base electrode, is connected in series with the transducer for dynamically adjusting the unidirectional biasing current flowing therethrough. SA975032 -1-

公开(公告)号：FR2401550A1

公开(公告)日：1979-03-23

申请号：FR7821334

申请日：1978-07-12

Applicant: IBM

Inventor： HARR JEROME D

IPC: G01R19/04 ,  H03K5/1532 ,  H03F3/72

Abstract: This peak detecting circuitry avoids false peak indication while using component circuits of smaller dynamic range and lower voltage energizing power supplies than is possible with contemporary circuitry. The electric wave having peaks for which the times of occurrence are desired, is applied between an erecting (non-inverting) input terminal of a differential amplifying circuit and a point of fixed reference potential. A capacitor is connected between the inverting input terminal of the differential amplifier circuit and the reference point. The differential output of the amplifier circuit is applied through individual amplifier circuits to the capacitor for charging and discharging it in accordance with the instantaneous polarity of the electric wave. A unilateral impedor is interposed in the charging circuit in the form of a diode or a transistor for preventing discharge upon reversal of the electric wave slope. Latching and like circuitry is coupled to the detecting circuitry for indicating the detection. An electric connection, preferably including a diode element and/or a resistance element, is arranged between the indicating circuit and the amplifying circuit for dynamically altering the threshold from a high value as the peak of the wave containing noise is approached to a relatively low value as the peak of the wave containing timing information is approached.

公开(公告)号：FR2350657A1

公开(公告)日：1977-12-02

申请号：FR7709626

申请日：1977-03-25

Applicant: IBM

Inventor： HARR JEROME D

IPC: G11B5/02 ,  G11B5/03 ,  H03F3/45 ,  H03G3/20

Abstract: The ideal response expected of an electromagnetic transducer, particularly of the Magneto-Resistive (M-R) type, obtains with signal translating circuitry for amplifying the varying signal produced and for dynamically biasing the transducer for maintaining the transducing operation in the linear portions of the characteristics of both the transducer and the amplifying circuitry. An M-R transducer is connected to the input circuit of alternating signal differential amplifying circuitry for delivering the desired signal at output terminals. The offset voltage across the transducer is compensated by differentially biasing input transistors of the amplifying circuitry. Biasing direct current through and/or voltage across the M-R transducer is controlled by a circuit connected to the output terminal and responsive to the signal thereat for developing a slowly inversely varying unidirectional voltage, preferably within a low pass filter interposed in the control circuit for stability. A current handling device, conveniently a transistor having the control voltage applied to a base electrode, is connected in series with the transducer for dynamically adjusting the unidirectional biasing current flowing therethrough.