RU1797931C - Device for the chromatic music reproduction - Google Patents

Abstract

The invention relates to the field of satisfying a person’s vital needs, namely to spectacular entertainment. The purpose of the invention is to increase the effectiveness of aesthetic impact by detecting musical rhythm. In a device based on an amplitude-frequency spectrum analyzer with lighting elements, low pressure gas discharge tubes are used as lighting elements, in which the discharge current is modulated by an external oscillation at the frequency of ionization waves (strata). In this case, the discharge is stratified into light and dark areas — visualization of striations, and the spatial period of such a structure lies in the range of 0.5–5 cm. The spatial period, like the intensity of the glow, depends on the depth of modulation of the discharge current and upon a change in depth The modulation of the discharge is like a luminous accordion, compressing and expanding. The device contains an input preamplifier, resonant filters, an integrator, current premodulators, a master oscillator, modulators, 3 il. with

Description

The invention relates to the field of satisfying a person's vital needs, namely to spectacular entertainment.

The aim of the invention is to increase the effectiveness of aesthetic impact by identifying the musical rhythm.

SUMMARY OF THE INVENTION FIG. 1-3, in which: FIG. 1 - oscillograms explaining the effect of visualization; Fig. 2 - dependence of the spatial period of the visualized structure on the modulation depth of the discharge current; in FIG. 3 is a functional diagram of the device.

When the discharge current is modulated at the frequency of ionization waves (striations), the effect of visualization of striations takes place: the discharge in the tube turns out to be divided into light and dark areas visible to the eye. The nature of this effect lies in the essentially nonlinear interaction of the modulating oscillation and the natural oscillation of the discharge, as illustrated in FIG. 1. In FIG. Figure 1 shows the sequence of oscillograms of plasma emission at various points of the discharge tube. In this case, the maximum increase in luminescence occurs at those points in the discharge where the maxima of the modulating oscillation coincide with the maxima of the traveling ionization wave. Conversely, when the maximum of the ionization wave coincides with the minimum of the modulating oscillation, a sharp decrease in the intensity of the glow occurs. The nonlinear nature of the interaction leads to the stratification of the discharge into

Vj

Yu x |

N0

Cj

light and dark areas. The spatial period of such a visualized structure is approximately equal to the wavelength of the string and, depending on the discharge conditions, varies from 0.5 to 5 cm. An essential feature of this invention is the sharp dependence of the spatial period H (and the intensity of the glow) on depth modulation of the discharge current Dt (Fig. 2). With a sufficiently smooth change in the modulation depth Dm (with a frequency from -0 to 1-3 Hz), the spatial period of the visualized structure begins to change in accordance with FIG. 2. At such frequencies, changes in the depth of modulation are well resolved by the eye: the discharge behaves like a luminous accordion, then compressing, then expanding. The oscillations of the spatial period of the visualized structure can be controlled by an arbitrary signal, in particular a music signal in a selected frequency band. In this case, the discharge will fluctuate in accordance with the rhythm of the music in a given frequency range.

A device for a similar purpose, using the effect of visualization of striations, according to the applicants and the authors, is not described in the literature, which makes it possible to consider its significant differences and novelty to be relevant.

The device (Fig. 3) contains an input preamplifier 1, a system of parallel resonant filters 2 connected to a preamplifier 1, each of which is connected to the cathode of the gas discharge tube 5. through the integrator 3 and immodulator 4. In the same cathode circuit. 5 a master oscillator 6 is switched on, the output of which through a modulator 7 is connected to the input of the modulator 4. The anode of the tubes 5 is connected to the power unit 8.

The device operates as follows. Generator & 6 generates a signal at a frequency of strata, which is fed to current modulator 4 through pre-modulator 7, providing the effect of visualization of striations in discharge tube 5. Pre-modulator 7 modulates this signal in amplitude in proportion to the intensity of the music signal in this frequency band, providing vibrations of the visualized structure in accordance with the rhythm of the music. A low-frequency control signal is generated by a unit consisting of a resonant amplifier 2 and an integrator 3, the latter playing the role of a low-pass filter, the bandwidth of which is limited from above by a frequency of 1-3 Hz, which provides a visual perception of the vibrations of the structure under consideration.

The signal to the resonant amplifiers of all N channels is supplied from the preamplifier 1 simultaneously. The gain is determined by the power of the control signal. Preamplifier 1 can be excluded from the circuit if we use the signal generated as an input signal

terminal power amplifier of a sound reproducing device.

An example of a specific implementation. Used a gas discharge tube 30 cm long, filled with neon at a pressure of 2

5. Torr For each particular set of values of the discharge parameters (gas pressure, tube radius, discharge current), the frequency of the striations is fixed. This allows the use of a master oscillator with

0 fixed generation frequency. The low requirements for the presence of non-linear distortion allows the use of a simple generator on a single transistor stage with an LC circuit in a feedback loop. The only requirement for the transistor is to provide the necessary amplitude of the generated signal. The frequency of the signal coincides with the frequency of the striations, changing

0 depending on bit conditions in the range from 0.8 to 1.2 kHz. When setting up this experiment, the signal value varied from 10 to 30 V. The resonant amplifier was made on the basis of the KT704A transistor using a resonant LC filter. It is permissible to use a single transistor stage, as linearity requirements are very low here too. The signal from the output of the resonant amplifier is detected by a semiconductor diode, then filtered

An RC circuit with m 2 Hz and is fed to the first input of the premodulator assembled on the basis of the pentode (to the second grid), the signal from the master oscillator 6 is fed to the first grid. A signal is recorded from the anode resistance of the tube at a stratum frequency with an average amplitude of 10-30 In and at a low modulation depth of up to 70%. This signal

,. fed to the control grid of a triode connected in series with a gas discharge tube, providing a depth of modulation of the discharge current of up to 30%. The average value of the discharge current varied in

c, ranging from 50 to 100 mA. Gas discharge tube powered by a high voltage voltage source (500 V). The magnitude of the current is controlled by a ballast resistance varying from 5 to 100 kΩ. With the specified specific parameters for the elements

5

The device achieves visualization of the striations in accordance with the dependence of their spatial period and luminous intensity on the depth of modulation of the discharge current.

The technical and economic efficiency of the proposed device consists in increasing the operational and aesthetic advantages of color musical devices by influencing the human visual apparatus. The proposed device can be used by persons with reduced hearing, as well as when creating advertising devices, toys, etc. .

Claims (1)

SUMMARY OF THE INVENTION A color music reproducing apparatus comprising a preamplifier at the input of a device, 0 5 connected to a system of parallel band-pass resonant filters, each of which is connected through an integrator and a current modulator with a lighting element, characterized in that, in order to increase the effectiveness of the aesthetic effect by detecting the musical rhythm, it is equipped with a master oscillator, premodulators according to the number of modules current torches and a power supply, each lighting element is made in the form of a low-pressure gas discharge tube, the cathode of which is connected to a current modulator, and the anode to the power supply, each The second premodulator has two inputs, one of which is connected to the master oscillator, the other to the corresponding integrator, and the output to the input of the modulator. FIG. 1 EA, slg go cho 60