SU769606A1 - Generator of voice signals of upper frequencies for electro-musical instrument - Google Patents

Description

t

The invention can be used in electronic music instruments.

A device for receiving the top tones of music signals, consisting of dividers, whose division factors are fractional numbers 1, is known.

Such a device, thanks to the use of a fractional division factor, makes it possible to use a low-frequency generator as a master and to obtain the necessary division factors with a small division error. The device consists of two shift registers: the first one having n + 1 bits and the second one having m bits. They are connected through AND-NOT schemes in a certain way into ring counters. The outputs of the n-th and (n + 1) -th bit are connected to the input of the first bit in two. AND-NOT controlled from the register with m bits. Depending on whether the first or second NAND scheme is carried out, the first register forms a ring counter with a division factor of n or n + 1. A register of m bits receives control signals from the first register and controls the NAND circuits. If the ring counter

counts X times n + 1, and the rest of the time counts n, the output frequency decreases relative to the input

N times.

+ 2L m

The disadvantages of this device are the considerable complexity of the circuit.

4p shift register for n and p + 1 bits and receiving a ring counter with two different counting modules (n and n + 1), besides the output signal from the device is a short pulse and can not be used

5 directly to receive the music signal.

The closest technical solution to the invention is a generator

20 high-frequency signals containing a trigger frequency divider with a division factor N, the outputs of the corresponding triggers of which are connected to the inputs of a multiple-input NAND logic element, the output of which is connected to the R-inputs of the triggers of the trigger trigger frequency divider and the first input of the two-input logic element N Trigger frequency divider with division factor

M, the trigger outputs of which are connected to the inputs of the second multi-input logic element NAND, and the input logic element N, the first input of which is connected to the input bus, and the output is connected to the trigger input of a frequency divider with the division factor N, the output of which is connected to the trigger trigger input frequencies with a division factor of M 2j.

A disadvantage of the known high-frequency tone generator is the insufficient formation accuracy and stability of the output signals,

The purpose of the invention is to improve the accuracy of formation and stability of the output signals.

This is achieved by the fact that the high-frequency tone generator for an electromusical instrument contains a trigger frequency divider with a division factor N, the outputs of the corresponding trigger programs of which are connected to the inputs of the multiple-input logic element AND-NOT, the output of which is connected to the trigger inputs of the trigger frequency divider. and the first input of the two-input logic element And, the trigger frequency divider with the division factor M, the outputs of the flip-flops of which are connected to the inputs of the second and many of the traveling logic element NAND, and the input logic element AND whose first input is connected to the input bus, and the output is connected to the input of a trigger frequency divider with a division factor N, the output of which is connected to the input of a trigger frequency divider with a division factor M, two additional logical element AND-NOT, three additional logic elements AND and trigger, the counting input of which is connected to the output of the first additional logic element AND, one input of which is connected to the output of the two-input lo And the second input - with the output of the second additional logic element And, one input of which is connected to the input bus, and the second input - with the output of the input logic element And and the first input of the third additional logic element And, the second input of which is connected to the output of the trigger and the output is connected to the second input of the input logic element AND, and the inputs of the first additional logic element AND-NOT are connected respectively to the second output of the first trigger of the trigger frequency divider with oeffitsiento dividing M and the output of this divider, the output of the first additional AND gate is coupled to the first input of the second additional AND gate NOR / second

the input of which is connected to the output of the second multi-input logic element NAND, and the output is connected to the second input of the two-input logic element I.

The drawing shows a block diagram of a high frequency tone generator.

The high-frequency tone generator contains a trigger splitter 1 frequency with a division factor N and a trigger splitter 2 frequency with a division factor M, logic gates AND 3-7, logic gates AND-NE 8-11 and trigger 12.

The tweeter operates as follows.

In the absence of pulses from the logical elements AND-NOT 8 and 9, the trigger 12 at the output generates a voltage that determines the output state of the element 4 and allows the input pulses to pass through the element 3, from which they go to the input of the trigger divider 1. After counting the number of input pulses equal to the integer part of the specified division factor, the logical element IS – NE 8 produces a short pulse that sets the trigger divider 1 to its initial state and also goes to the input of the AND 7 element. Simultaneously The nth trigger of the trigger divider 1 impulses a pulse to the input of the trigger divider 2.

At a certain state of the trigger trigger of the splitter 2, the logical element AND-NOT 9 gives a permission for the passage of a short pulse from the logical element AND-NOT 8 logical element AND 7. In this case, the pulse passed through the logical element And 7 is fed to the input of the logical element AND b, the other input of which receives the permitting voltage from the logical element AND 5. From the output of the logical element I 6, a short pulse arrives at the counting voltage of the trigger 12 and changes its state to one that permits the passage s input pulse from the logical element And 3 through the logical element And 4 and back to the other input of the logical element And 3, and thus prohibits the passage of the second pulse through the logical element And 3 to the input of the trigger divider 1. To the input of the logical element And 5 from the output of the logical element 3 is supplied with a permitting voltage to pass the input forbidden pulse to the input of trigger 12 through logic elements 5 and 6. At the time of completion of this input pulse, trigger 12 is restored to its previous state, prohibiting its operation of the AND 4 logic element. The output voltage of the AND 4 logic element does not prevent the input pulses from AND 3 from the logic element to the trigger division of body 1 until the next pulse appears from the NAND logic elements and 9. Setting the trigger 12 to prohibiting the operation of the logic element AND 4 and allowing the passage of input pulses through the logic element AND 4 to the input of the trigger divider 1, occurs as described above and in the case when, after turning on the power supply, the trigger occurs It denies the passage of input pulses to the trigger divider 1. The division factor in the generator X is equal to n, where X is the number of dead pulses per cycle, m is the number of register bits, n is the number of pulses, after which the trigger divider 1 is set to initial state. Frequency. At the generator output is equal to. (i) At the outputs of the trigger trigger of the trigger divider 2, the signal has the form of a meander, which can be directly used as the upper and octave tones of the musical scale. The division ratio of the generator high-frequency signals is determined by the number of bits of the trigger dividers 1 and 2 and the selected function of the AND-HE logic elements 8 and 9 acting as control devices. Thus, it is possible to obtain the integer part of the division coefficient in the form of any integer number and its fractional part in the form of any fraction. Claims A high-frequency tone generator for an electric music instrument, contains a trigger frequency divider with a division factor N, the outputs of the corresponding triggers of which are connected to the input NAND of the multi-input logic element IS-NOT, the output of which is connected to the R inputs of the triggers of this trigger frequency divider and the first input of the two-input logic element And, trigger frequency divider with the division factor M, the outputs of the flip-flops of which are connected to the inputs of the second multiple input the AND NAND logic element and the input logic element AND, the first input of which is connected to the input bus, and the output is connected to the input of the trigger frequency divider with the division factor N, the output of which is connected to the input of the trigger frequency divider-with the division factor M distinguishing the by the fact that, in order to increase the formation accuracy and stability of the output signals, two additional logical elements AND — NOT, three additional logical elements AND and a trigger, whose counting input is connected to the output And an additional logic element, one input of which is connected to the output of the two-input logic element And, and the second input - with the output of the second additional logic element And, one input of which is connected to the input bus, and the second input -. with the output of the input logic element And the first input, the third additional logic element And, the second input of which is connected to the output of the trigger, and the output is connected to the second input of the input logic element AND, and the inputs of the first additional logic element AND IS NOT connected respectively with the second output of the first trigger trigger frequency splitter with a division factor M and the output of this divider, the output of the first additional logic element AND IS NOT connected to the first input of the second additional of the NAND logic element, the second input of which is connected to the output of the second NES multi-input logic element, and the output is connected to the second input of the two-input logic element I. Sources of information taken into account in examination 1, Japan Application No. 50-40654, cl. 102684, 25.12.75. 2. The patent of the USA 3755609, cl. 84-1.23, 04/28/72.

Claims (1)

Claim A high-frequency tone generator for an electric musical instrument, comprising a trigger frequency divider with a division ratio N, the outputs of the corresponding triggers of which are connected to the inputs of the multi-input logic element AND-NOT, the output of which is connected to The R-inputs of the triggers for this trigger frequency divider and the first input of the two-input logic element And, the trigger frequency divider with the division coefficient M, the outputs of the triggers of which are connected to the inputs of the second multi-input logic element AND, and the input logic element And, the first input of which is connected to the input the bus, and the output is connected to the input of the trigger frequency divider with a division coefficient N, the output of which is connected to the input of the trigger frequency divider-with a division coefficient M, characterized in that, with c In order to increase the accuracy of the formation and stability of the output signals, two additional AND-logical elements, three additional AND logical elements, and a trigger, the counting input of which is connected to the output of the first additional logical AND element, one input of which is connected to the output of the two-input logical AND element, are introduced into it , and the second input - with the output of the second additional logical element And, one input of which is connected to the input bus, and the second input -. with the output of the input logic element And and the first input of the third additional logic element And, the second input of which is connected to the output of the trigger, and the output is connected to the second input of the input logic element And, the inputs of the first additional logic element AND are NOT connected respectively to the second output of the first trigger trigger frequency divider with a division coefficient M and the output of this divider, the output of the first additional logical element AND is NOT connected to the first input of the second additional log of an AND-NOT element, the second input of which is connected to the output of the second multi-input logic element AND-NOT, and the output is connected to the second input of the two-input logical element I.