CARBON MICROPHONES
For a telephone system important requirements are (i) the microphone shall be of convenient size; (ii) capable of mass production at low cost while possessing high sensitivity to operate from a simple battery; (iii) its performance must be stable and adequate to provide intelligible speech and articulation and; (iv) it need not necessarily include the higher harmonic frequencies for reproducing.
On the other hand, microphones used for purposes such as radio broadcasting are relatively few in number and their cost is not a primary consideration: high fidelity reproduction up to about 10,000 Hz for natural speech and music transmission is essential.
An inset pattern of carbon granule microphone is in general use for telephone ...
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