SU907565A1 - Electric musical instrument - Google Patents

Description

(54) MUSICAL CALLS

I

This invention relates to an alarm.

Known electromusic containing an individually programmable timer, forming a set of signals, frequency dividers, logic circuits, combinations of signals and output speakers.

A disadvantage of this device is its complexity.

The closest in technical essence to the present invention is an electromusic bell containing a sound generator, a tone generator connected to the input of a sound generator, a power amplifier connected to an acoustic emitter, a clock generator, an OR-NOT element entering the switching device, and a button inclusive 2.

However, the well-known electro-music bell has insufficient reliability and melody.

The purpose of the invention is to increase reliability while increasing melody.

The goal is achieved by the fact that an electromusic bell containing a sound controlled generator, one input of which is connected to the output of a tone signal generator, and the output through an amplifier is connected to an acoustic emitter, a clock generator, an OR-NOT element and a start button connected through

Claims (2)

15 resistor with DC bus voltage; a shift register is entered; time specifies resistors and dividing diodes; to the outputs of the clock of the clock generator, and each of the outputs of the shift register is connected directly to one of the inputs of the OR-NOT element and through a series-connected decoupling diode and time the master resistor with the second sound input g generator. The drawing shows the structural electrical circuit of the proposed electromusic bell. Electro-musical bell contains controlled sound generator 1, tone signal generator 2, amplifier 3, acoustic emitter 4 generator 5 cycles, element 6 OR-H shift register 7, start button 8, resistor 9, separation diodes 0-1, ..., 10-P, 11, time setting resistors 2-1, ..., 12-p. A constant voltage is applied to the bus 13 - E The principle of operation of an electromusic bell is as follows. Pressing the button 8 unlocks the information input of the register 7 and supplies the potential of the power source -Ey (equal to the level of the logistic unit) through the reference resistor 9; The generator 5 pulses record this potential for the first register discharge, thereby providing the output voltage of the element 6 with a level of logical zero, blocking the information input of the shift register. The pulses of the generator 5 shift the level of the logical unit sequentially across the bits of the shift register until all its outputs have a logical zero state (the initial state). Shifting alternately in bits, the level of the logical unit through the corresponding 10-P diode and the 12-P register acts on generator 1 and causes its excitation at a frequency depending on the nominal resistance of the frequency-setting resistor. The values of the 12-p resistors are selected in such a way that a sequential change in the frequency of the sound generator provides a specified program (code for signaling. In the place of the program (code) where the duration of a certain tone must be longer compared to the rest, the adjacent bits of the shift register are connected together to a single frequency setting resistor. For the purpose of the timbre oKjpacKH, the sound of an electromusic bell or a specific law according to which the amplitude of a signal or amp and there (frequency; each tone separately, the signal from oscillator 2 acts accordingly on sound generator 1. Here the frequency modulation (amplitude) of the tone or the law of amplitude variation of the signal as a whole depends on the shape of the control voltage. Amplified signal Oscillator 1 is reproduced by emitter 4. By varying the frequency of oscillator 5, you can change the duration of the tone of the signal (change the speed of its reproduction). Thus, the proposed electromuscular call scheme allows reproducing an audio signal with any given sequence of tones and their varying duration, as well as changing the timbre of the signal or the nature of the rise and fall of each tone or signal as a whole. The invention includes an electromusic bell containing a sound controlled oscillator, one input of which is connected to the output of the tone signal generator, and the output is connected via an amplifier to an acoustic emitter, a clock generator, an OR-NOT element and a start button connected to a DC bus. , characterized in that, in order to increase reliability while simultaneously increasing melody, a shift register, time specifying resistors and separation diodes, one of which is connected between the output, are entered; the OR-NOT element and the connection point of the contact of the start button with the said resistor and one of the shift register inputs, the other inputs of which are connected to the clock generator outputs, and each of the shift register outputs are connected directly to one of the inputs of the OR-NOT element and through sequentially connected separation diode and time setting resistor - with the second input of the sound generator. Sources of information taken into account in the examination of 5 1. US Patent No. 3789402, cl. 340-348 E, 01.29.74, 2. Radio Frensehen Electronic, 1977, veb. Verlag Technik Berlin, s. 607.