Exciting Voltage

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Figure 2a. Conditions for Step 1.

(UNUSED)

(UNUSED)

Figure 2b. Conditions for Step 2.

STEP l — Both microphones are excited by the same sound pressure, . Their open-circuit voltages Vr and Vx are proportional to their sensitivities, Mr and .1/.y- Then

STEP 2 — The reversible microphone is driven by a current, Ir, producing a volume velocity of sound, U = IrMr, in the cavity, whose acoustic impedance is Z\. This, in turn, produces a sound pressure, Pi — UsZa at, the unknown microphone, which generates a voltage, V'x = Pt Mx.

Then,

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