Accession Number:

ADA067045

Title:

Linear Signal Processing and Ultrasonic Transversal Filters,

Descriptive Note:

Corporate Author:

NAVAL UNDERSEA RESEARCH AND DEVELOPMENT CENTER PASADENA CA

Personal Author(s):

• Squire, William D.
• Alsup, James M.

Report Date:

1969-11-01

Pagination or Media Count:

68.0

Abstract:

The role of linear transversal filters in signal processing is discussed in Section I. Linear filters for signal processing must often have complicated impulse responses, with large bandwidth and large time-bandwidth product. The linear transversal filter, a delay line with weighted and summed taps, is ideally suited for the implementation of such filters because of its simplicity of synthesis. The filters impulse response is derived by the application of some concepts from the theories of vector spaces and sampling, and is shown to be equal to the tap weighting function. Thus, the synthesis procedure consists merely of sampling the specified impulse response at appropriate-intervals and using the sample values as the tap weights. In Section II, a generalized transversal filter is described and analyzed. A delay line with multiple arrays of taps, each array with a multiplicity of weighting functions, has as the impulse response between any pair of ports the cross-correlation function of the weighting functions for the two ports. A number of implementations of transversal filters employing a variety of delay line types are described and some aspects of transduction and wave propagation in bounded media are presented in relation to these implementations.

Descriptors:

• *SIGNAL PROCESSING
• *LINEAR FILTERING
• REAL TIME
• RESPONSE
• TRANSVERSE WAVES
• RADAR SIGNALS
• SONAR SIGNALS
• DELAY LINES
• IMPULSE LOADING
• ULTRASONIC FREQUENCIES

Subject Categories:

• Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE