Man-machine link for converting coordinates to phase differences

Details Man-machine link for converting coordinates to phase differences Man-machine link for converting coordinates to phase differences

1985-07-22

1988-04-19

Caldwell, Sr., John W.

Communications: electrical

Audible indication

Percussion-type sound producer

340706, 178 18, G09G 300

Patent

active

047393033

ABSTRACT:
A tablet device provides a coordinate count. A link is provided for each of the coordinates, the link including a pulse signal generator for generating first and second pulse signals which have a variable phase difference and which supply an interface for a "mouse". Controlled by the second pulse signal, an up-down pulse counter counts up and down in response to the first pulse signals. By comparing the pulse count with the coordinate count, a comparator produces a result signal which is indicative of whether the pulse count is or is not less than the coordinate count. The result signal is used in adjusting the variable phase difference to make the pulse count converge on the coordinate count. The pulse signal generator may have a pulse sequence generator for generating first and second pulse sequences which are produced as the respective pulse signals and which are not produced when the result signal indicates that the pulse count is or is not equal to the coordinate count, respectively. Preferably, the link is supplied with either an origin indicating signal which is indicative of an origin or an origin signal which selectively indicates the origin. The variable phase difference is adjusted to make the pulse count converge to zero when the origin is indicated. The link can be implemented by a computer.

REFERENCES:
patent: 3732557 (1973-05-01), Evans et al.
patent: 3975592 (1976-08-01), Carvey
patent: 4492818 (1985-01-01), Abe
patent: 4501931 (1985-02-01), Ohya et al.
patent: 4507523 (1985-03-01), Gohara et al.

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