Plastic-Tape Sound Spectrograph

Abstract
A description of the circuitry and response of the plastic-tape spectrograph of the Bell Telephone laboratories. Speech samples can be recorded with other tape recorders with speeds other than 5.5 inches per second. The new equipment eliminates the disadvantage of re-recording with the consequent signal distortion. The original equipment has been in operation approximately 2 years, is easy to operate and dependable.
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