SU982040A1 - Graphic information readout device - Google Patents

Description

paraphaen excitation pulses, whose inputs are connected to the pulse distributor and to the frequency generator, and the outputs are connected to the corresponding switches, and the second coordinate remover connected to the input of the C2J amplifiers. However, this device is not characterized by high reliability and accuracy. The purpose of the invention is to improve the accuracy and reliability of the device. The goal is achieved by the fact that in the device containing a tablet made as a system of two interorthogonal coordinate buses connected to the corresponding switches, an amplifier connected to the coordinate remover and with one detector input, the other input of which is connected to the frequency generator, paraphase pulse generation units The inputs of which are connected to the frequency generator and the distribution -. pulses, and the outputs are connected to the inputs of the respective switches and the cdriga register, which is connected to the pulse distributor, which is input. connected to the output of the frequency generator; a trigger is inputted, the input of which is connected to the pulse distributor; a counter connected to the shift register and to the pulse distributor; and an integrator connected in series, the input of which is connected to the detector output, a threshold element, a pulse shaper, and an AND-OR element, the inputs of which are connected to the pulse distributor and to the trigger, another input of which is connected to the pulse former, and the output of the AND-OR element is connected to the input of the counter. FIG. 1 is a block diagram of the device; in fig. 2 is a time diagram explaining its work. : The device contains a tablet 1, a switch 2 and 3 on the axis X and Y, blocks 4 and 5 of the formation of paraphase pulses, a frequency generator 6, a pulse distributor 7, a puller 8 coordinates, an amplifier 9, a phase-sensitive detector 10, a shift register 11 , integrator 12, threshold element 13, driver 14, element AND-OR 15, counter 16 and trigger 17. The device operates as follows. In accordance with the control signals of the 7th pulse distributor, block 4 generates pulses with high-frequency filling, the phase of which is determined by the reference signals of the RRID Pd produced by the frequency generator b. The signals F, and F antiphase. The excitation pulses, having passed through switch 2, are fed to the corresponding coordinate tires. Simultaneously with the beginning of the alternate switching of buses X (Fig. 2), a signal appears at the output of the pulse distributor 7, triggering the trigger 17, which from now on allows the passage of pulses to the counting input of the counter-16 through the element-AND-OR, This g, the signal sets at the control input of the counter 16 a pulse counting resolution. At the other input of the element AND-OR 15, connected with the output of the imaging device 14, a zero level is established at the initial moment, prohibiting the passage of F / 2 pulses to the input of the counter of the time interval into code. As the tires are alternately compacted, a group of simultaneously simultaneously excited paraphase tire pulses approaches an eight-point puller located at a given point on the plate. At 8, the emf of the useful signal is induced, which is passed, the amplifier 9 is detected by a phase-sensitive detector 10. The signal at the detector output is shown in Fig. 12b / where the dotted line shows the averaging round curve at t. This step signal is fed to the path of the integrator 12, the output of which is the resultant signal (Fig. 2c), represented by straight line segments. Only a part of the integrated signal, exceeding the set threshold, is detected at the output of the threshold element 13. The signal at the output of the former 14 (Fig. 2e) represents a single logical level, which appears at the instant when the threshold level crosses the front of the integrated signal and disappears at the moment t, j of crossing the threshold level by the decay of the integrated signal. At time t, the output signal of the limiter 14 triggers the trigger 17 to the zero state and prohibits the arrival of pulses of frequency F at the input of counter 16 through the AND-OR element 15 and allows the arrival of pulses of frequency F / 2 at the input of counter 16 through the other half of the element AND-OR 15 At time t / j, the arrival of pulses F / 2 is stopped and the counter 16 has a fixed number of pulses proportional to the time interval tan f, and from the output of counter 16 the coordinate code is rewritten into shift register 11, from which output it can be transmitted to, VM. When it is necessary to obtain greater accuracy in fixing the coordinate, multiple conversions of the X (Y) coordinate are performed, the number of pulses accumulated over 2 cycles is written to the register 1-1 and produced

dividing the number due to n shift towards the lower bits. Averaged over 2 cycles, the value of the cord is then transmitted to the computer. The register is controlled from the third output of the pulse distributor 7.

Similarly, the formation of the Y coordinate code is performed.

. The introduction of new nodes and as well. Also, new constructive links will significantly improve the accuracy and reliability of information retrieval. Invention Formula

A device for reading graphic information containing a board made in the form of a system of two interorthogonal coordinates 1B: bus OSs connected to the corresponding drivers, an amplifier connected to the coordinate remover and one detector input, the other input connected to a frequency generator, paraphase formation units . pulses, the inputs of which are connected to the frequency generator and the distributor them; pulses, and the output is connected to the input of the corresponding switches, and the shift register connected to the pulse distributor, whose input connects to the output of the frequency generator, characterized in that, in order to increase accuracy and reliability, it contains a trigger, the input of which is connected to the distributor impulses, the counter connected to pexvcTpy was shifted to the distributor, the pulse divider, and successively connected to the integrator, whose input is connected to the output of the Detector, the threshold element pulse shaper and the terminal) AND-OR, the inputs to o-r-cerned connected to the pulse distributor and to the trigger, the other input of which is connected to the generator I1 1ulsov, and the output of AND-OR -. connected to the input from etnbka.

Source of information,

accepted during examination

1.Avtsfsky Certificate of the USSR 714434, cl. G About K 11/06, 1977,

2. USSR author's certificate for software No. 2961179 / 18-24,

cl. G 06 to 11/06, 1980.

KE8M

1

faiptiUMut

Claims (1)

_Claim A device for reading graphic information containing a tablet, Valuable in the form of a system of two (5 mutually orthogonal coordinate buses connected to the corresponding switches, an amplifier connected to a coordinate pick-up and one detector input, the other input of which is connected to a frequency generator, paraphase forming units pulses, the outputs of which are connected to the frequency generator and to the pulse distributor, and the outputs are connected to the inputs of the corresponding switches, and a shift register connected to the distributor a pulse field, the input of which is of the key to the output of the frequency generator, characterized in that, in order to increase accuracy and reliability, it contains a trigger whose input is connected to the pulse distributor, a counter connected to the shift register and the pulse distributor, and sequentially connected integrator, the input of which is connected to the detector output, a threshold element, a pulse shaper and an AND-OR element, whose inputs are connected to a pulse distributor and to a trigger, the other input of which is connected to the pulse shaper ls, and the output ^ of the AND-OR element is. · connected to the input ^ of the counter.