Showing papers on "Offset (computer science) published in 1968"
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25 Jan 196818 citations
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10 citations
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IBM1
TL;DR: In this article, the gain of a difference amplifier is controlled as a function of temperature to offset variations, which are due to temperature changes, in the threshold level of a threshold device.
Abstract: The gain of a difference amplifier is controlled as a function of temperature to offset variations, which are due to temperature changes, in the threshold level of a threshold device.
9 citations
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31 Jul 1968TL;DR: In this paper, the offset value count-in-control (CIC) method is used for adjusting the current value of an offset being used by the numerical control system to a new value by counting into the system a count indicative of the magnitude and polarity of the difference between the existing offset value currently employed by the NCS and the desired new offset value.
Abstract: A new and improved numerical control system is described which has an offset value count-in control means for adjusting the current value of an offset being used by the numerical control system to a new value by counting into the system a count indicative of the magnitude and polarity of the difference between the existing offset value currently employed by the numerical control system and the desired new offset value. The offset value count-in control means comprises reversible counter means for storing data indicative of a current offset value being employed by the numerical control system. A comparator is provided having a first input coupled to a value indicating output from the reversible counter and having a second input supplied with data indicative of a new or input offset value. The comparator serves to compare the existing offset values set into the reversible counter to the new or input offset value and to derive a count-adjusting output signal indicative of the magnitude and polarity of any difference. Means are provided for feeding the count-adjusting output signal derived from the comparator back to a count-adjusting input to the reversible counter for adjusting the count contained in the reversible counter to a value corresponding to the new or input offset value. Means are also provided for supplying this count-adjusting output signal from the comparator to the numerical control system for adjusting the offset value being employed by the numerical control system to the new or input offset value.
9 citations
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10 Dec 19686 citations
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15 Oct 1968TL;DR: In this paper, the conductors of a pair carrying current in opposite directions are respectively mounted adjacent to opposite faces of the flat workpiece but offset horizontally, this offset being, however, small relative to the offset between any two conductors on the same side of the workpiece.
Abstract: Induction heater for flat work pieces.. GC-. Particularly for heating continuously travelling strip or sheet, the conductors of a pair carrying current in opposite directions are respectively mounted adjacent to opposite faces of the flat workpiece but offset horizontally, this offset being, however, small relative to the offset between any two conductors on the same side of the workpiece. The offset may be adjustable or the leads rotatable about their long axes. Separate (e.g. hairpin) inductors may be mounted on opposite sides of the workpiece with their corresponding conductors offset, their mean currents being preferably equal and antiphased. The arrangement overcomes the problem of fluxing thin material conventionally requiring high frequency, and accommodates itself to workpieces of different thickness.
03 Jun 1968
TL;DR: In this article, the conductance of offset series slots in stripline for 50-ohm characteristic impedance and three common ground plane spacings is calculated using frequency-independent curves.
Abstract: : Frequency-independent curves are presented which can be used to calculate the conductance of offset series slots in stripline for 50-ohm characteristic impedance and three common ground plane spacings. Experimental verification is given for a particular case. (Author)
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18 Mar 1968
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TL;DR: Offset vector iteration method for two point boundary value problems, discussing parameters selection, convergence and computation flow diagram.
Abstract: Offset vector iteration method for two point boundary value problems, discussing parameters selection, convergence and computation flow diagram
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01 May 1968TL;DR: In this article, a fixed, offset, spherical reflector with a mechanically steered line feed is proposed as an economic design for a ground-station aerial, and the optimal distribution of electric field along the axis of the reflector is calculated for the case of an incident circularly polarised wave.
Abstract: The present trend in satellite communication systems is towards large geostationary satellites which are accurately maintained on station. A fixed, offset, spherical reflector with a mechanically steered line feed is proposed as an economic design for a ground-station aerial. The distribution of electric field along the axis of the reflector is calculated for the case of an incident circularly polarised wave, and it is shown that the optimum distribution for a transmitting feed follows closely the axial field in the receiving case. Because of the asymmetry of the system, an entirely numerical technique has been developed, using a digital computer to calculate the axial field. A similar technique is used to compute the performance of an aerial using an offset spherical reflector and a line feed of crossed current elements. The aerial is shown to have a high theoretical efficiency (81%), with low spillover and a good sidelobe structure. The limitation of bandwidth with this type of feed is discussed, and proposals are made for an improved, design of line feed.
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21 Feb 1968
TL;DR: In this paper, the authors describe a digital-to-analog converter with a single polarity, which is applied in true and inverted form to switches 5 and 6 having a common output point 11 connected, via a capacitor 12, to a high-impedance output amplifier 14.
Abstract: 1,103,647. Digital to analogue converters. STANDARD TELEPHONES & CABLES Ltd. 23 Sept., 1966, No. 42493/66. Heading G4H. In a decoder, e.g. for a PCM system, a logic circuit 1 receives a digital coded signal in serial form and controls a digital-to-analogue converter 2 to produce analogue signals of a single polarity, which are applied in true and inverted form to switches 5 and 6 having a common output point 11 connected, via a capacitor 12, to a high-impedance output amplifier 14, the capacitor being connected to earth by a third switch. The capacitor 12 and switch 15 compensate for the " offset " voltages of the switches 5 and 6. These are electronic switches and the offset voltage may be regarded as a battery in series with an ideal switch. When the capacitor is earthed on the remote side it is charged to the value of the offset voltage but in a direction opposite to the offset voltage. When converter 3 produces its output signal, this and the offset voltage are applied to the capacitor. The charge on the capacitor cancels the offset voltage, leaving the correct analogue equivalent of the digital input. The sign of the sample value is given by the first digit. This digit appears on the first output terminal when the coded signal is read into the control logic 1 and is used to select one of the switches. The switch 15 is then briefly closed so that the offset voltage of the selected switch is applied to the capacitor 12. A timing signal controls switch 15. The characteristic of the converter is non-linear to improve the quality of transmitted speech signals.
01 Jan 1968