Ultrasonic frequency expansion processor

Details Ultrasonic frequency expansion processor Ultrasonic frequency expansion processor

1993-04-27

1994-02-08

Isen, Forester W.

Electrical audio signal processing systems and devices

Sound effects

Reverberators

381 683, 381 67, H04R 2500, A61B 704

Patent

active

052854990

ABSTRACT:
A method and apparatus for ultrasonic frequency expansion is characterized by expanding audiometric frequencies before translation into the ultrasonic range. The audiometric signals are first expanded in time by a factor of 1/.beta. where .beta.<1 while generally maintaining the frequency content of the audiometric signals. Next the frequency of the signals is expanded by a factor 1/.beta. while compressing the time scale to that of the original signal. The frequency expanded signal is processed via a single-sideband upconverter to translate the frequency expanded signal into a single sideband signal in the ultrasonic range.

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Katz, Jack, Handbook of Clinical Audiology, Third Edition, 1985, pp. 108-110.
Portnoff, Michael R., "Time-Scale Modification of Speech, Etc.", IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-29, No. 3, pp. 374-390, Jun. 1981.
Lenhardt et al, "Human Ultrasonic Speech Perception", Science, vol. 253, Jul. 1991, pp. 82-85.

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