초록 ▼

Apparatus for absorbing acoustic energy directed toward a wall. The apparatus includes a piezoelectric layer intermediate the wall and the source of the acoustic energy. Circuitry attached to the output of the transducer compensates blocked and motional capacitances of the transducer so that the out

Apparatus for absorbing acoustic energy directed toward a wall. The apparatus includes a piezoelectric layer intermediate the wall and the source of the acoustic energy. Circuitry attached to the output of the transducer compensates blocked and motional capacitances of the transducer so that the output signal generates real current for dissipation in a resistor thereby to minimize any echo reflected from the piezoelectric layer.

대표청구항 ▼

In an analog circuit having a reactive element of a predetermined value that generates a reactive signal component at output terminals thereof, signal compensation means for producing a signal component that offsets the reactive signal component comprising: a compensating reactive element having ele

In an analog circuit having a reactive element of a predetermined value that generates a reactive signal component at output terminals thereof, signal compensation means for producing a signal component that offsets the reactive signal component comprising: a compensating reactive element having electrical characteristics that correspond to those of the reactive element in the analog circuit; amplifier means having differential input and differential output terminals, one of said amplifier output terminals being connected to one of the analog circuit output terminals and the other of said amplifier output terminals being connected through said compensating reactive element to the other of said analog circuit output terminals; and input circuit means for coupling the voltage across said compensating reactive element to said differential input terminals whereby said signal compensation means exhibits the characteristics of a reactive element having a value equal to the negative of the predetermined value.