Elements of acoustical engineering (1940) Elements of acoustical engineering elementsofacoust00olso Year: 1940 74 ANALOGIES The limiting frequencies are given by — = 0 and — = 22 22 Applying these relations it can be shown that the systems of Fig. are band pass filters transmitting currents, velocities or volume currents of all frequencies lying between two cutoff frequencies/d and/c2. G. Band Elimination Wave Filters. — Electrical, mechanical and acous- tical band elimination wave filters are shown in Fig. ELECTRICAL MECHANICAL Fig. Band elimination wave filters. The impe

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Elements of acoustical engineering (1940) Elements of acoustical engineering elementsofacoust00olso Year: 1940 74 ANALOGIES The limiting frequencies are given by — = 0 and — = 22 22 Applying these relations it can be shown that the systems of Fig. are band pass filters transmitting currents, velocities or volume currents of all frequencies lying between two cutoff frequencies/d and/c2. G. Band Elimination Wave Filters. — Electrical, mechanical and acous- tical band elimination wave filters are shown in Fig. ELECTRICAL MECHANICAL Fig. Band elimination wave filters. The impedance of the series arm in the three systems is ze\ = Zmi — Zai = 1 — cj'^CeiLi jcomi 1 — Op'CMlffll jwM 1 - co^C^iMi For a description of the acoustic capacitance Ca\ see Sec. The impedance of the shunt arm in the three systems is J ZE2 = JC0L2 — Zm2 = jo}m2 — ZA2 = J0iM2 — The limiting frequencies are given by CoCe2 J <^Cm2 j wCa2 ^ =: 0 and - = - 4 22 22

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