Broadcasting (Oct 1931-Dec 1932)

Record Details:

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Now ... A Revolutionary "Development! RCA Victor VELOCITY MICROPHONE "THE MICROPHONE WITHOUT A DIAPHRAGM" VELOCITY ACTUATED! Most microphones (all those using a diaphragm) are subject to pressuredoubling and hence accentuate certain of the higher frequencies. The VELOCITY MICROPHONE avoids this because it is not a pressureoperated device. Its moving element is a light metal ribbon which vibrates at a velocity proportional to the velocity of the sound wave. Unlike a pressure-operated diaphragm, this ribbon element has no resonant frequency in the audible range . . . hence does not accentuate any notes . . . and does not require a compensated amplifier. WIDER FREQUENCY RANGE! The e.m.f. generated by the ribbon element is proportional to the velocity of the sound wave. Since this velocity is independent of the frequency, the response of the VELOCITY MICROPHONE is nearly uniform over a range extending from 30 cycles to beyond 14,000 cycles. GREATLY IMPROVED FIDELITY! Old-style microphones presented an impeding surface to sound waves which set up reflections and caused cavity resonance with consequent humps in the frequency characteristic. The VELOCITY MICROPHONE does not — it is open — the sound waves penetrate it freely. Because there are no peaks whatever in its response, it reproduces with perfect fidelity every note of the program presented before it. DIRECTIONAL CHARACTERISTIC! The VELOCITY MICROPHONE has very marked directional characteristics (entirely independent of frequency) which greatly facilitate pick up of desired features and elimination of extraneous noise. However — since it is bi-directional— it actually provides greater space for artists. INCREASED PICKUP! The energy response of this microphone to reflected sounds is only one third that of non-directional (diaphragm) microphones. Since the ratio ol direct to reflected sounds determines the distance of satisfactory pickup, this microphone may be used at distances 1.7 times those for other types of microphones of the same sensitivity. LOW IMPEDANCE! The impedance of the VELOCITY MICROPHONE is low. This eliminates inductive pickup and makes possible location at a distance from the amplifier with resulting increase in convenience and decrease in amplifier cost. ENGINEERING PRODUCTS DIVISION RCA Victor Company, Inc. A Radio Corporation of America Subsidiary CAMDEN, N. J. w Radio Headquarters