PARAMETRIC ARTIFICIAL TALKER
make the most economical use of available transmission bandwidths the fundamental
structure and the information bearing elements contained in speech was determined with a
machine (Parametric Artificial Talker) designed and built at SRDE.
By changing the voltages applied to the input, sounds resembling human speech were
synthesised and displayed as two and three-dimensional speech patterns. When the voltages
were varied to a pre-set pattern PAT uttered complete phrases and by varying the control
signals comparatively slowly and passing them through a narrow band filter it was shown
that speech could be transmitted with a bandwith of less than 100 Hz.