SU962928A1 - Device for computing exponential functions - Google Patents

Description

The invention relates to the field of computing and measuring equipment and can be used in the construction of control and specialized computers, calculators, functional transducers, logarithmators, sound pressure meters, sound power meters and other electronic equipment.

A device for raising to a power is known that contains logic elements, a pulse generator, a register, and a counter 1.

A disadvantage of the known device is the low accuracy of the calculation.

The closest in technical essence to the present invention is a device comprising a pulse generator, an AND element, a trigger, a result counter, a decoder and a register, the input and output of which are connected respectively to the input of the device argument and the decoder input, the output of the pulse generator is connected to the first input of the element And, the second input of which is connected to the output of the trigger and the output of the moment when the device finishes calculating, the input of the result counter is connected to the output of the AND element, the input of the setting to the trigger unit is connected to. input start device 2.

However, the known device is inherently insufficient calculation accuracy.

The purpose of the invention is to improve accuracy.

The goal is achieved by

10 that in the device containing the pulse generator, the element And, the trigger, the result counter, the decoder and the register, the input and output of which are connected respectively to the input of the argument

15 of the device and the input of the decoder, the output of the pulse generator is connected to the first input of the element I, the second input of which is connected to the output of the trigger and the output of the moment of the computation 2Q of the device, the input of the result counter is connected to the output of the element And , before . A controlled frequency delimiter, a pulse subtractor, a pulse adder and a comparison circuit, the first input of which is connected to the output of the result counter, the output of the paraple device code of the device, are also introduced.

Claims (2)

30 by the first input of the pulse subtractor, the second input of which is connected to the controllable frequency divider and the first input of the pulse cooler, the second input and the output of which are connected respectively to the output and microphone of the subtractor and the second input of the average circuit, the output of which is connected to the trigger input to the zero, the output of the element I is connected to the counting-1M input of the controlled frequency body, the control input of which pot is connected to the output of the decoder of the output of the output pulse number code of the device connected to the output of the element I. The drawing shows the block diagram of the device. The device for calculating the exponential functions contains a pulse generator 1, an AND 2 element, a trigger 3, a register 4, a decoder 5, a result counter b, a needle-pulse subtractor 7, a pulse accumulator 8, a comparison circuit 9, a frequency divider 10 controlled. Consider the operation of the device on the example of calculating the value of 10. The essence of the operation of the device is as follows. To calculate the value of the number N o, where X is an integer, the original sequence of pulses, following with frequency (,, is divided by frequency 10 times from the time t-,. In the general case, we can assume that t 0. pulse sequence with the following frequency fo-i fn / 10 The resulting auxiliary pulse sequence is subtracted from the initial one during the time interval at. As a result, at the end of the time interval ut we get the number of pulses defined by the expression N, Cfo -,) dg the result of the calculation This adds ten pulses. N, -N, and stop counting and the process of dividing the frequency of following the original pulse sequence at the time t of equality of the integral values of the transformed pulse sequence and the original sequence over the time interval d1 t J -t, i.e. at, 1t. mr j () iFj (. (4) t.t1 Computing the left and right sides of (4), we get (o -fo) dt + 1.0 fp4t (5) From 10 (or fo-it. 10), a 4t Since the result of calculating N is obtained by counting the number of counting pulses of the frequency fo (i.e., the initial sequence of pulses) during the time interval l1, taking into account (b) N fo-lO ... (7) The operation of the device is as follows. The first input of the element 2 from the output of the generator 1 pulses is outgoing pulses with the following frequency 0. At time t, i.e. at the moment the device starts, trigger 3 is transferred to a state of unity at which p It is possible to pass pulses of frequency fg to the output of the element AND 2. From the output of the AND 2 element to the output of the pulse number code of the device, the inputs of the result counter b and the divider 10, the initial sequence of frequency pulses comes (,. Register 4 pre-records the binary-decimal code of x-1, where X is the exponent As a result of deciphering the code -.isla x-1 using a decoder 5, the potentials that determine the division factor of the frequency divider equal to one for each stage of the divider unit at zero potential or ten at unit As a result, the inputs of the subtractor 7 and the adder 8 receive pulses with the following frequency determined from (1). During the time, for example, at 1 gf, the end of the calculation process, the number NOI (8) and in the subtractor 7, the number determined from (2). The adder 8 will receive the number of pulses f 0-1 t As a result of the summation of the numbers (2) and (9), the input of the comparison circuit 9 will be received from the output of the adder 8 (3), which may be sour in the form of Na N n -NOI Over time & t at the input of the comparison circuit 9 will come from the output a result of counter b ,, code defined by the C8). At time t, i.e. when the codes of the numbers (3) and (8) are equal (o - foi) it + ft fg.At (11, at the output of the comparison circuit 9, a pulse is formed that sets the trigger 3 to the zero state. The time instant t of equality of the codes of numbers (3) and (8) determines the end of the time interval l1 ti - t. From expression (11) it can be seen that the equality of the codes of numbers (3) and (8) is satisfied. The time interval 4t can be determined from expressions (6) or (9) No7 10 10. 10 Consequently, the number recorded in the counter B of the result of pulses during the time At is 10 toX N N01 foo- - Difference From the prototype in the proposed technical solution, the increase in accuracy is achieved by eliminating the methodological error of calculating the value of, due to the use of approximate methods of calculation based on polynomials. The increase in accuracy in the proposed device is achieved by introducing a new constellation and a sequence of pulse frequency conversion operations the time required to obtain the desired result of calculating the numbers N Yu, suggestions set of operations and after hovatelnost ensures not only the formation of the number N of parallel code, but also the number of pulse code number, and the time interval proportional thereto. An apparatus for calculating exponential functions, comprising a pulse generator, an And element, a trigger, a result counter, a decoder and a register, the input and output of which are connected respectively to the input of the device argument and the decoder input, the output of the pulse generator is connected to the first input of the And element, the second input which is connected to the output of the trigger and the output of the moment when the device finishes calculating, the input of the result counter is connected to the output of the element I, the input of setting the trigger unit to the input of the pu As a device, characterized in that, in order to improve accuracy, a controlled frequency divider, a pulse adder and a comparison circuit, the first input of which is connected to the output of the result counter, the output of the parallel result code of the device and the first input of the pulse subtractor, the second input of which is entered into it connected to the output of a controlled frequency divider and the first input of a pulse adder, the second input and output of which are connected respectively to the output of the impedance subtractor and the second input of the comparison circuit, the output to The output is connected to the input of the trigger set to zero, the output of the element I is connected to the counting input of the controlled frequency divider, the control input of which is connected to the output of the decoder, the output of the pulse number result code of the device is connected to the output of the element I. Sources taken into account expertise 1. USSR author's certificate 587467, cl. С О F 7/552, 1978. 1. USSR author's certificate; 634273, cl. С 06 F 7/552, 1978 (prototype).