METHOD FOR SHAPING CONTROL SIGNAL FOR ELECTROACOUSTIC PROJECTOR Russian patent published in 2015 - IPC H04R9/00 G10K11/00 

FIELD: electricity.

SUBSTANCE: method suggests the operation of the projector in operating and test modes, delivery to the projector of a voltage signal U(t), which is composed of a conventional signal Utr(t) and two auxiliary voltage signals Ud(t) and Und(t): $$\begin{array}{l}U(t)=Utr(t)+Ud(t)+Und(t)=\\ k\cdot (p(t)+\alpha 0\cdot p(t)\text{'}+\alpha 1\cdot p(t)"+\alpha 2\cdot {\int }_0^{t}p(t\text{'})\cdot e^{-(t-t\text{'})/at}dt\text{'}+\alpha 3\cdot \int {\int }_0^{t}p(t\text{'})\cdot e^{-(t-t\text{'})/at}{d}^{2}t\text{'}).\end{array}$$ Here Utr(t) means the conventional voltage signal proportional to the value of a desired acoustic pressure Utr(t)=k·p(t); Ud(t) means an auxiliary voltage signal calculated as per formula Ud(t)=k·(a0·p(t)'+a1·p(t)"). Here Und(t) means an auxiliary voltage signal calculated with the consideration of k coefficient that defines the loudness level, desired acoustic pressure p(t), the first and second pressure-time derivatives. During calculations of Und(t) it is necessary to consider the constant at that characterises the damping rate of an oscillating system as well as constants a0, a1, at which the rise and drop rate of acoustic pressure signals is approached maximally to the rise and drop rate of test signals, and constants a2, a3, at which the shape of the acoustic pressure signal within limits of an operating frequency range of the projector is approached maximally to the shape of the test signals. Und(t) is calculated as per the formula $$Und(t)=k\cdot (\alpha 2\cdot {\int }_0^{t}p(t\text{'})\cdot e^{-(t-t\text{'})/at}dt\text{'}+\alpha 3\cdot \int {\int }_0^{t}p(t\text{'})\cdot e^{-(t-t\text{'})/at}{d}^{2}t\text{'}).$$

EFFECT: improving sound quality.

6 cl, 2 dwg