Accession Number:

AD0744474

Title:

Acoustic Signal Processing Devices.

Descriptive Note:

Semiannual progress rept. no. 1, 1 Oct 71-1 May 72,

Corporate Author:

HUGHES AIRCRAFT CO FULLERTON CALIF GROUND SYSTEMS GROUP

Personal Author(s):

• Judd,Gordon
• Smith,W. R.
• Morse,F.

Report Date:

1972-05-01

Pagination or Media Count:

71.0

Abstract:

The objective of the program is to develop the analytical and experimental techniques required to implement phase coded filters with surface wave delay lines. The end goal of this study is to establish some useful bounds on the practicality of using surface wave devices to synthesize and decode phase coded waveforms with large time-bandwidth products. The report includes a brief tutorial discussion of the characteristics of various types of phase codes. Emphasis is given to the trade-offs involved in selecting optimum codes for secure communication applications. The circuit model formulated to analyze the response of various tapped delay line designs is described together with an illustrative example of its use in optimizing the performance of a given design. The results of experimental work in the development of coded and uncoded delay lines made on quartz and lithium niobate substrates are presented with special attention given to the improved output response that has been achieved with a new tapping array geometry designed for use on high coupling substrates. Author

Descriptors:

• *DELAY LINES
• *CODING
• PERFORMANCE(ENGINEERING)
• SECURE COMMUNICATIONS
• ACOUSTIC FILTERS
• ULTRASONIC RADIATION
• LITHIUM
• QUARTZ
• DECODING
• CORRELATION TECHNIQUES
• CURVE FITTING
• GRAPHICS
• TRANSFER FUNCTIONS

Subject Categories:

• Line, Surface and Bulk Acoustic Wave Devices
• Cybernetics
• Non-Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE