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公开(公告)号：DE4123565C1
公开(公告)日：1992-09-17
申请号：DE4123565
申请日：1991-07-16
Applicant: TANDBERG DATA A/S, OSLO, NO
Inventor： MOEN, TOR, OSLO/OSLO, NO
Abstract: A method and apparatus for compensating the alternating electrical fields present at the front surface of a cathode ray picture tube wherein the high-voltage signal supplied to the high-voltage terminal of the tube is tapped to extract an alternating voltage signal therefrom, and the alternating voltage signal is inverted and amplified and then applied to a suitable external electrode placed in the proximity of the picture tube. The external electrode can be a framing band, an aquadag region or a ring electrode, among other things. Furthermore, combination of these electrodes can be employed.
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Patent Agency Ranking
公开(公告)号：DE3533447C2
公开(公告)日：1991-09-12
申请号：DE3533447
申请日：1985-09-19
Applicant: TANDBERG DATA A/S, OSLO, NO
Inventor： LIA, HERMAN, LI, NO
IPC: G11B20/10
Abstract: To improve recording of data on a magnetic recording medium such as a magnetic tape, amplitudes of write signals supplied to a magnetic head are modified, dependent on distances between edges of the write signals. The modification occurs such that, given a short spacing, a respective write signal has a greater value than given a large spacing. Amplitudes of the write signals are modified in three steps when the GCR method is employed as a writing method for recording the data, distances of the edges of the write signals being capable of assuming three different values.
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公开(公告)号：DE58907243D1
公开(公告)日：1994-04-21
申请号：DE58907243
申请日：1989-04-12
Applicant: TANDBERG DATA A S OSLO OSLO
Inventor： HARDENG ERIK N
Abstract: The invention relates to a method for recording data information on a magnetic recording medium (7) with the aid of a magnetic write head (5) and a variable-gain write amplifier (4), which precedes the said write head and to which the information is fed in the form of binary data signals (DS1) as well as biasing signals (BS), superposed on the latter. The recorded signals are read again by a reproducing device (8 to 10) directly after recording. In a measuring device (12), the peak-value shift of the read signals (DS2) is measured and averaged. The amplitudes of the binary data signals (DS1) and/or of the biasing signals (BS) are corrected by a control signal (BAS), generated by a control unit (13) as a function of the averaged peak-value shift, to achieve an optimum relationship between read-signal amplitude and minimum peak-value shift. … …
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公开(公告)号：DE4109589C2
公开(公告)日：1993-07-29
申请号：DE4109589
申请日：1991-03-20
Applicant: TANDBERG DATA A/S, OSLO/OSLO, NO
Inventor： PAHR, PER OLAV, OSLO, NO
Abstract: Each of the magnet systems of the multiple magnetic head is assigned a preamplifier (4) which has an input stage (41) and an output stage (42). The former is physically arranged directly on the multiple magnetic head and is connected to the output stage physically assigned to the read channel (7) via a flexible connecting line (80) comprising only signal lines. The output stage has switching means (TR3, TR4 and TR8, R15 to R17) for selectively closing a current path between the output stage and the assigned input stage by means of a selection signal (SEL). The input stage is designed in the manner of a voltage-controlled resistor which switches itself to high impedance as long as the assigned output stage is not activated. The outputs (01, 02) of all the output stages (42), connected in parallel, are preferably coupled into the read channel via an output stage (43) designed as a differential voltage amplifier (DA). … …
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公开(公告)号：DE3717981C2
公开(公告)日：1991-11-07
申请号：DE3717981
申请日：1987-05-27
Applicant: TANDBERG DATA A/S, OSLO, NO
Inventor： STRAND, STEINAR, LANGHUS, NO
IPC: G11B20/10
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