SU1577739A1 - Birdscarrer - Google Patents

Abstract

FIELD: agriculture, protection and protection of industrial agricultural objects from birds. The purpose of the invention is to increase the effectiveness of bird scaring. The bird repellent device comprises first 1, second 2 and third 3 master oscillators with a time varying frequency, each of which is formed by serially connected first frequency modulator 4 and first master oscillator 5, second frequency modulator 6 and second master oscillator 7, the third frequency modulator 8 and the third master oscillator 9. The device control unit 10 is made in the form of a switch 11, a pseudo-random pulse generator 11, a pseudo-random pulse generator 12 and the control panel 13 modes. One of the terminals of the mode control panel 13 is connected to the input of a pseudo-random pulse generator 12, the output of which is connected to the control input of the switch 11. The switching inputs of the switch 11 are connected to the corresponding outputs of the master oscillators 1, 2, 3 with a time varying frequency. The inputs of these master oscillators are electrically connected to the outputs of the mode control panel 13. The device also contains an amplifier 14, its input connected to the output of the switch 11, and the output to the input of the amplifier 15. As a result of connecting the master oscillators 5, 7, 9 through the switch 11 to the input of the power amplifier 14, it produces a voltage which is a frequency modulated signal that is emitted by the sound emitter. 1 hp ff, 2 ill.

Description

1

The invention relates to agricultural hoses, in the field of protection and protection against mHit. various industrial and agricultural facilities.

The purpose of the invention is to increase the effectiveness of bird scaring.

FIG. I shows a block diagram of the device; in fig. 2 shows time diagrams of voltages produced by the components of a block diagram.

The device for repelling birds contains the first - third 1-3 puller generators. time-varying frequency, each of which is formed by serially connected by the first frequency modulator 4 and the first master oscillator 5, the second frequency modulator 6 and the second master oscillator 7, the third frequency modulator 8 and the third master oscillator 9. Control unit 10 made in the form of a switch 11. a pseudo-random pulse generator 12 ii of the mode control panel 13. One of the pins of the console 13 controls the modes to the input of the pseudo-random pulse generator 12, the output of which is connected to the control input of the switch P. The switching inputs of the commutator 11 are connected to the corresponding times of the master oscillators 1-3 s with .gkkltseyys in time frequency.

The inputs of the specified master oscillators: - the gricles are connected to the outputs of the control panel 13 of the control modes. The device also contains an amplifier 14, the input associated with the output of the switch 11, and the output with the input of the amplifier 15.

The bird scarer works in a single way.

Clock pulses 1), generated by a clock pulse generator, incoming and composition of a pseudo-random pulse generator I. 12 and following with period t, - (0.01-0.6) s, which is set from the mode control panel 13, is fed to the input duration schemes for their formation. Voltage U .: on the output of the pseudorandom pulse generator 12 has the form of a random random sequence of high and low level direct impulses (a sequence of binary values - "ones and" zeros, respectively) with a duration of each pulse, explicit or a multiple of t, . The sequence of rectangular pulses and the output of the pseudo-random pulse generator 12 is fed to the control input of the commutator 11. The switch at each transition or low level 1b to high and up-and-out switches the outputs of the oscillators 5, 7, 9 to the input of amplifier 14 power in order — first, second, third — first, second, third generators, etc., as the characters change (“zeros and“ ones) to

output pseudo-random pulse generator 12.

Frequency modulator 4 generates a sawtooth voltage Ua, the period Tin of which is set from the control panel 13 of the mode control by changing the parameters of the time - the master RC chain.

The output voltage Us of the frequency modulator 4 is fed to the input of the master oscillator 5, which is a voltage-frequency analog-to-digital converter.

The output voltage LU of the master oscillator 5 has the form of a sequence of pulses of variable period equal to

four

T 1

 fi p u

where Ец is the instantaneous frequency, the value of which is proportional to the current value of the output voltage Us of the frequency modulator - 0 l torus 4.

Adjusting the period Tim of the voltage Ua from the mode control panel 13 provides for changing the values of the frequency F, t and its rate of change -4g1- within

 (20-20000) Hz;

(5-200) - south 3 Hz / s. al

Frequency modulator 6 generates a sawtooth voltage Us, the period TUMt of which is set from the console 13 for controlling modes by changing parameters of the time of the master RC-chain.

The output voltage Us of the frequency modulator 6 is fed to the input of the master oscillator 7, which produces the voltage Ue in the form of a sequence of pulses of variable period equal to

 it F, t

Ogde r is an instantaneous frequency, the value of which is proportional to the current value of the output voltage Us of the frequency modulator 6.

Adjustment period ttsmg voltage

5 Us from the mode control console 13

provides a change in frequency values

FJ / and rate of change - in the limit

lah

F2; (20-20000) Hz;

5 -. (5-200). 103 Hz / s

Frequency modulator 8 generates a triangular voltage U, the period TUKj of which is set from the control unit 13 of the control 5 modes by changing the parameters of the time of the RC circuit. The output voltage U of the frequency modulator 8 is fed to the input of the master oscillator 9, which produces the voltage Us in the form of a sequence of pulses of variable period equal to:

one

T3;

3i

output signal duration duration τ „initial frequency fo, speed

df frequency changes -t -.-, varying in

limits:

where RE is the instantaneous frequency, the value of which is proportional to the current value of the output voltage U of the frequency modulator 6.

Adjusting the period T, from the mode control panel 13, allows changing the values of the frequency F3i and its speed

dt

F3i (20-20000) Hz;

(5-200) - Y3 Hz / s.

As a result of the serial connection of the master oscillators 5, 7, 9, implemented by the switch 11 to the input of the power amplifier 14, it produces a voltage Ug, which is a discrete composite frequency-modulated signal, which is emitted by the radiator 15 sound signals. The functions of changing the frequency of the indicated signal Ug for the given values of Tii, TUHt, T c 5 are shown in diagram 10 (Fig. 2).

Frequency modulators 4, 6, 8 are designed in such a way that, from the control panel 13, the modes for each of them can be set to the type of output voltage Us or Us or Uj. This means that the modulators determine for the master oscillators 5, 7, 9 any of the three linear frequency modulation (LFM) laws considered — increasing chirp, decreasing chirp, decreasing-increasing chirp.

This adjustment of the chirp law parameters provides for each dist, (0.01-0.6) s; fo (20-20000) Hz;

d.i

(5-200) - Y3 Hz / s. al

Claims (2)

1. A device for scaring birds, containing an emitter of sound signals, connected to the output of a power amplifier, a control unit, defining generators with a time-varying frequency, characterized in that, in order to increase the effectiveness of scaring birds, the control unit is made in the form of a mode control console, a pseudo-random pulse generator and a switch, with one output of the mode control console connected to the input of a pseudo-random pulse generator whose output is connected to the control input switch pa and switched inputs latter are connected to corresponding outputs of oscillators with time-varying frequency, furthermore, the output switch coupled to the input of the power amplifier, and the remaining outputs remote control modes are connected to the control inputs of the respective oscillators with varying frequency. 2. A device according to claim 1, characterized in that each master oscillator with a time-varying frequency is designed as a series-connected frequency modulator and a master oscillator. and, B 2