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Multichannel, Random Access Acoustic Echo Storage Memory

IP.com Disclosure Number: IPCOM000084726D
Original Publication Date: 1975-Dec-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Melcher, RL: AUTHOR [+2]

Abstract

A technology is proposed for obtaining acoustically induced storage in piezoelectric semiconductors, in a manner that eliminates one of the two radio-frequency cavities presently required for the technology described in the IBM Technical Disclosure Bulletin, Vol. 18, No. 7, December 1975, pages 2356 to 2359, and permits random access of small regions of the crystal thereby increasing the storage capacity over that presently available.

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Multichannel, Random Access Acoustic Echo Storage Memory

A technology is proposed for obtaining acoustically induced storage in piezoelectric semiconductors, in a manner that eliminates one of the two radio- frequency cavities presently required for the technology described in the IBM Technical Disclosure Bulletin, Vol. 18, No. 7, December 1975, pages 2356 to 2359, and permits random access of small regions of the crystal thereby increasing the storage capacity over that presently available.

Small thin films are deposited in an array on the front surface of the piezoelectric crystal. Each film segment can serve as a separate channel of information. A pulsed laser beam is directed on the film segment from a scanner thereby allowing random access of the film. The purpose of the beam is to rapidly heat the individual film segment, thereby causing a pulse of radio- frequency phonons to be generated. These phonons are used to write in the information as well as to read out any information already stored there, in conjunction with the radio-frequency pulse at the opposite end.

The physical principle of the generation of the phonons using the laser pulsed has been described in R. M. White, JAP 34, 3559 (1963), and results from the rapid heating and cooling of the thin-film segment which gives rise to the launching of an acoustic wave with frequency components centered about 1/T, where T is the laser pulse width (or the pulse width of the heating and cooling of the film)...