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Interpolation method using pre-emphasized input samples

A convergence correction and interpolation technology, applied in the calculation using the number system, the use of cathode camera tube image reproducer, cathode ray tube indicator, etc., can solve the problem that the solution is not optimal, and achieve accurate input waveform reproduction , save memory, avoid the effect of high frequency components

Inactive Publication Date: 2005-01-05
THOMSON LICENSING SA
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Problems solved by technology

Neither solution is optimal

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  • Interpolation method using pre-emphasized input samples
  • Interpolation method using pre-emphasized input samples
  • Interpolation method using pre-emphasized input samples

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Embodiment Construction

[0032] The present invention relates to an optimal process and apparatus for generating a waveform from a sequence of waveform-determining factors, and is particularly suitable for recovering a waveform from a minimum number of samples with a minimum computational effort. The invention is applicable in a variety of situations, but here a digital convergence correction system is shown in which a matrix of factors for points spatially distributed on a display is stored and used to generate each Correction waveform for color raster.

[0033] The digital convergence system shown in Figure 1A generally includes: a convergence pattern generator; an amplifier for driving a convergence correction coil or deflection coil; a memory for storing correction constants and an interface with a microprocessor. The convergence system is used to determine and store a matrix of correction factors for each color raster position at a separation point in the display. The system determines additiona...

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Abstract

A method for generating a convergence correction curve from a plurality of successive output data values determined from a plurality of input sample values smaller in number than the plurality of output data values, the method comprising the steps of: defining successive and overlapping intervals including exactly three of the input sample values; interpolating a plurality of the output data values in an interpolation interval by calculating a moving average of a linear interpolation curve based on the three input sample values, each of the output data values being influenced by the three input sample values; emphasizing differently the influence of the three input sample values for determining different ones of the output data values in the interpolation interval; and, adjusting the input sample values to control convergence correction, whereby each incremental slope of the correction curve between adjacent output data values varies smoothly.

Description

technical field [0001] The present invention relates to the interpolation of correction factors for points between discrete correction sample points, such as a matrix of points in an array or a series of spaced points along a line. The correction factor for a specific data point is determined by preprocessing the correction factors for the weighted segment data before and after the segment where the specific point is located. For segments of specific points, the preprocessing modifies the correction factors input into the second-order piecewise interpolation process, and smoothly approximates the ideal correction curve with fewer correction factors and minimal data processing operations. The invention can be used, for example, in digital convergence correction systems that interpolate between points in a matrix of convergence correction points for color CRT (cathode ray tube) displays, or upconverted image data, or time domain sampled audio signals. Background technique [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/17G06F7/38G09G1/00H04N9/28
CPCH04N9/28
Inventor E·M·奥东内尔
Owner THOMSON LICENSING SA
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