Sample rate coordinator and data handling system

Details Sample rate coordinator and data handling system Sample rate coordinator and data handling system

G - Physics

06

K

354/70, 352/19.6

G06K 7/00 (2006.01) G06K 7/016 (2006.01)

Patent

CA 1057859

ABSTRACT OF THE DISCLOSURE A data sample rate is selected for a data base on a rotating drum. The sample rate determines the distance between samples on the data base. The sample distance is set into an adder-accumulator. As the data base is scanned, scanning pulses clock the accumulator to add the distance scanned between clock pulses to an intermediate sum held in the accumulator. The scanned distances are accumulated, causing the intermediate sum to increase by steps. Each time the intermediate sum exceeds the desired distance between samples, the accumulator activates a data sampling device for reading the data base. A remainder exists in the accumulator because the distance between sampled points is generally not a simple multiple of the distance between clocked points on the data base. That is, the encoding or timing capability of the convertor is fixed, defining fixed multiple thereof while the distance between data sampling points is selected independently of convertor capability. This mis- match or fundamental error remains in the accumulator and is added to the scan distance at the next scan pulse. The remainder or accumulating error changes by one multiple of the fundamental error at each subsequent sampling until the remainder exceeds one scan distance--the value of one step increase of the accumulator. The accumulator then activates the data sampling device one step sooner or later than usual depending on whether the accumulating error is increasing or decreasing with each overflow.

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