Surface acoustic wave device for data rate reduction

Details Surface acoustic wave device for data rate reduction Surface acoustic wave device for data rate reduction

1984-05-31

1987-06-09

Orsino, Jr., Joseph A.

Pulse or digital communications

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364827, 381 34, G01L 302, H04B 166

Patent

active

046726411

ABSTRACT:
A surface acoustic wave (SAW) device, and corresponding method, for expanding or contracting the time scale of an input signal that varies in time but is limited to a predetermined time interval. One embodiment of the invention achieves time expansion or compression by means of two Fourier transformations providing different chirp rates, and implemented in a form that includes only five SAW dispersive delay lines. In the illustrative version of this embodiment, three of the dispersive delay lines are used in conjunction with multipliers or mixers, and two are used as convolvers. Another embodiment of the invention uses only three SAW dispersive delay lines, two in conjunction with multipliers and one located between the multipliers to effect the desired time-scale change. A third embodiment of the invention employs a SAW tapped delay line and an associated set of gates to select successive data bit signals from successive output taps in the delay line. A SAW fill-in filter is used to fill in inter-bit gaps resulting from the use of the tapped delay line.

REFERENCES:
patent: 3202764 (1965-08-01), Adams et al.
patent: 3639695 (1972-02-01), Bertheas
patent: 3825860 (1974-07-01), Carr
patent: 4025954 (1977-05-01), Bert
patent: 4071906 (1978-01-01), Buss
patent: 4356353 (1982-10-01), Eng et al.
patent: 4524363 (1985-06-01), Kretschmer
Jack--"Fourier Transformation Processors"--Wave Electronics No. 3, Nov. pp. 229-247.

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