SU1203516A1 - Device for calculating values of trigonometric functions - Google Patents

Description

one

The invention relates to telecommunications and other areas related to the need to form sine-cosine dependencies, in particular, in devices for synchronizing discrete information transmission systems, and is intended to determine the value of sine and cosine functions in binary form at a given time. in binary form to the argument,,

The purpose of the invention is to improve accuracy.

The drawing shows the block diagram of the device.

The device contains an input of 1 argument, a distributor of 2 pulses, a register of 3 arguments, controlled dividers 4–6 frequencies, reversible counters 7 and 8, switches 9 and 10. Modulator 11 modulo two, HE 12, triggers 13 cosines signs and 14 sine signs, cosine registers 15 and 16 sines, outputs 17-20 of the device.

The device works as follows.

The bundle of M pulses produced by the distributor 2 is converted into a new bundle of M pulses at the output of the controlled divider 4, and then into two packs of Mj and M pulses at the outputs of the controlled divisors 5 and 6, which are written into reversible counters 8 and 7 through switches -10 and 9. As in the known device, the control inputs of the divider 4 are connected to the input 1 of the device via the register 3 of the argument, and the outputs of the reversible counters 7 and 8 are connected to the control inputs of the dividers 5 and 6 and registers 15 and 16 of storing function value to outputs 18 and 19 devices.

Prior to the start of signal calculations. Starting from distributor 2, the two most significant bits of the argument value in register 3 of argument define the signs of trigonometric functions, set initial values in reversible counters 7 and 8, and send certain control signals to switches 9 and 10.

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If the value of the argument is in the first quadrant., Which corresponds to O in the two highest-order bits of the argument register, then the operation of the proposed device is similar to the work of the known one. Indeed, the reversible counter 7 through the element NO 12 in this case is set to position 1, and the counter 8, to position O. The switches 9 and 10 are controlled so that the pulses from the outputs of dividers 5 and 6 arrive at the input of the h-counter eight

and entrance

counter 7, respectively,

The functions thus generated correspond to the sine and cosine functions. The value of the high bit of register 3 argument determines the sign of the sine functions. In the first two quadrants the sign of this function is +, and in the last two -. I

To determine the sign of the cosine function, use an adder 11 modulo two connected to two star ijjHM bits of register 3 arguments, which allows one to form the + sign of the cosine function in the first and fourth: this quadrants. The value of the penultimate of the high-order bits of the argument register determines the initial setting of the reversible counters 7 and 8 and controls the operation of the switches 9 and 10. The proposed device differs from the known only by the formation of the signs of the functions and initial settings. This is equivalent to dividing the domain of definition of the argument into four subintervals, in each of which the range of variation of the argument is equal to / 2, which means reducing the required number of pulses in the original burst,

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Thus, the maximum error of the proposed shaper due to a decrease in the number of counting strokes is four times smaller than that of the known one, moreover, the computation time is reduced four times without increasing the frequency of the pulses.

Editor V. Petrash

Order 8418/52 Circulation 709 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab. D. 4/5

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Branch GShP Patent, Uzhgorod, Proektna St., 4

Compiled by A.Zorin

Tehred A. Boyko Proofreader L. Patay

Claims (1)

DEVICE FOR CALCULATING TRIGONOMETRIC FUNCTIONS, containing a pulse distributor, three controlled, a frequency divider, an argument register, two reversible counters, two switches, a sine sign trigger, a cosine sign trigger, a sine register and a cosine register, and the input of the device argument is connected to the information argument the output of which is connected to the control input of the first controlled frequency divider, the information input of which is connected to the output of the clock pulses of the pulse distributor, the trigger pulse of which is connected to the enable input of the register of the argument, the output of the first controlled frequency divider is connected to the information inputs of the second and third controlled frequency dividers, the outputs of which are connected to the information inputs of the first and second switches, the first and second outputs of which are connected respectively to the summation inputs and subtracting the corresponding reversible counters, the output of the first reversible counter is connected to the control input of the third controlled delhi dividing the frequency and the information input of the cosine register, the output of which is connected to the output of the cosine value of the device, the output of the sine value of which is connected to the output of the sine register, the information input of which is connected to the output of the second reversible counter and the control input of the second, controlled frequency divider, pulse output end of the pulse distributor connected to the sine and cosine register enable inputs and the sine sign trigger trigger and the cosine sign trigger inputs, the outputs of which are connected s with the outputs of the signs of the corresponding functions of the device, characterized in that, in order to increase its accuracy, an adder modulo two and an element NOT are introduced into it, and the output of the Ith category of the register-argument (where ί is the bit of the argument) is connected to the first the input of the adder is modulo two and the information input of a sine sign trigger, the output of the ((-1) -th bit of the register of the argument is connected to the second input of the adder modulo two, which controls the input of the second switch, the output of the installation of the second reversible counter and the input of the element NOT, the output is cat It is connected to the control input of the first switch and the installation input of the first reversible counter; the modulator two output is connected to the information input of the cosine sign trigger. SU „, .1203516 triggers 13 cosine signs, registers 15 sine, outputs 17-20 works as follows 1 1203516