SU796850A1 - Trigonometric function computing device - Google Patents

Description

(B4) A DEVICE FOR CALCULATING TRIGONOMETRIC FUNCTIONS of the first element OR, the input of the reversible counter is connected to the output of the third element OR, and the outputs of the reversible counter are connected to the first inputs of the elements AND of the third group, the second inputs of the elements AND of which are connected to the outputs of the third counter. The drawing shows a block diagram of a device for computing trigonometric functions. The device contains adder-subtractor 1, counters 2, 3 and 4, reversible counter 5, groups of elements AND 6, 7 and 8, elements OR 9, 10 and 11. The device works as follows .. 15 The number-pulse sequence arrives at the device input Ng f оТ), where fg is the clock frequency, Tk is the converted time interval, n Counter 2 and group of elements And b form a binary frequency multiplier, controlled by the bits of counter 4. If the input of counter 2 receives frequency pulses fj ,, then the average frequency f at the output of the group of elements And 6 will be determined by the frequency fQ. . and the number N4 (1) located in the counter 4 f - foJkit) 6 N; 7

where N fj is the conversion factor for the counters. Pulses of frequency f (, are fed to the input of counter 3. Counter 3 and group 7 form a second binary frequency multiplexer controlled by counter 4. The average frequency f. Of the pulse output of group 7 is equal to

f fe N4. (t)

(2)

N

m

Taking into account the expression (1)

f - Mliil (3)

7

1If adder-subtractor 1 is running

addition, then the frequency f, j of the following pulses at its output is equal to the sum of the frequencies of the pulse sequences supplied to the inputs, i.e.

w

fQ +

f,.,

In view of (3)

, 1C | L1b. (five)

The number in counter 4 will vary in time according to the expression

N4 (t), (6)

- 0.0

whose solution is

(t) V9 7) EC on s From Tr up to ra C Im ss on Er

J-Bx.

(15) N,

N,

 m fn

where NQ is the initial value of the number in the counter 5. If the counter thx is calculated in the counter 4, and the addition occurs in the counter 5, then

Tx

fot N5 (t) No + J N5 (1) th

dt, (16)

His solution is

)%% h (17)

Nm

Therefore, the proposed device is suitable for calculating the Functions tgx, thx, cosx, chx (in the known only COSX, chx functions can be implemented).

Thus, the inclusion of an adder-subtractor and counters in the composition of the device and a change in the connections significantly expands the class of the problems being solved and improves the accuracy compared to the prototype.

Claims (2)

Invention Formula A device for calculating trigonometric functions, containing the first counter, three groups of elements AND Itri of the element OR, and the outputs of the elements AND of each group are connected to the inputs of the corresponding elements OR, the outputs of the first counter, subtractor-subtractor 1, work subtraction, then ft - fm f; (3) we obtain f N - Kl (t) N N f and - f% Jin L: ilii lil 0NT remove t). YN m 14 m Counter 3 and group 8 form a binary frequency multiplier that is supplied by counter 5. The average hour at its output (output of group 8) per% 6N is by the (1) and (7) (t) fe. (U) Nm N , the frequency fg pulses come on. input 5. If counter 5 works subtraction, then "5 (t) fl - solution has the form to the first inputs of elements AND of the first group, characterized in that, in order to expand the class of solved problems due to the possibility of calculating the functions tgx and thx, the second and third counters are entered into it, the adder-subtractor and the reversible counter, the first input of the adder-subtractor is connected to the device input and the input of the first counter, the second input of the accumulator-subtractor is connected to the output of the second element OR, the output of the totalizer of the subtractor is connected to the second counter, the outputs of which are connected to the second inputs of the elements of the first group and the first inputs of the elements and the second group, the second inputs of the elements of which are connected to the outputs of the third counter, the input of which is connected to the output of the first element OR, the input of the reversible counter OR, and the outputs of the reversible counter are connected to the first inputs of the elements AND of the third group, the second inputs of the elements AND of which are connected to the outputs of the third counter. Sources of information taken into account in the examination 1. AM Oransky. Hardware methods in digital computing. Minsk, BSU, 1977, p. 105-113. 2. USSR author's certificate number 560230, cl. G 06 F 15/34, 1978 (prototype).