Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1975-06-27
1977-04-05
Sloyan, Thomas J.
Communications: electrical
Audible indication
Percussion-type sound producer
340347M, 235 92MP, 23515111, H03K 1300
Patent
active
040165582
ABSTRACT:
Apparatus for use in a numerical control system for converting a digitial signal, representing a position of a work piece of material being controlled, to an analog signal for driving a servo motor to correct the position of the work piece. The apparatus includes a circuit for converting a digital signal representing the change in the actual position of the work piece to a plurality of signals representative of digital bits of information representing the error in position of the work piece per unit in time. First and second sets of shift registers for receiving the signals representative of digital bits of information, and at least first and second switches are also provided. Further provided is a circuit for transmitting signals representative of each of the least significant bits of information left within the first and second sets of shift registers, and applying each of the pair of bits of information to respectively control the operation of the first and second switches for predetermined periods of time. The duration of each of the periods of time corresponds to the count of the higher order of the two particular bits which are representative of the signals being transmitted at any particular time. Also provided is an integrator, and a circuit for repetitively applying first and second signals to the integrator at respective magnitudes corresponding to the ratio between the count of each of the two bits represented by the signals being transferred from the respective first and second sets of shift registers at one moment and for a duration controlled by the operation of the first and second switches. An analog signal is thereby obtained from the output of the integrator, which analog signal is equal to the sum of the products of the magnitude of the signals applied to the integrator and the respective predetermined periods of time.
REFERENCES:
patent: 3422423 (1969-01-01), Kaszynski et al.
patent: 3573803 (1971-04-01), Chatelon et al.
patent: 3707713 (1972-12-01), Diaz et al.
patent: 3728718 (1973-04-01), Dresser et al.
Bishop Everett Reece
Leroux Marcel Henri
Bernkopf Walter C.
Cahill Robert A.
General Electric Company
Sloyan Thomas J.
Young Stephen A.
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