Communications – electrical: acoustic wave systems and devices – Receiver circuitry – Responsive to intruder energy
Patent
1992-03-20
1993-09-14
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Receiver circuitry
Responsive to intruder energy
367135, 367124, H04B 106
Patent
active
052455890
ABSTRACT:
A method and apparatus for processing a set of signals to identify narrow bandwidth features of the signals, and optionally to process the signals further to extract information about the identified narrow-band features. The invention processes a set of input signal frames (a two-dimensional pixel array) to generate a narrow-band feature signal (also a two-dimensional pixel array) from which narrow-band features of the input signal frames can be efficiently, automatically, and unambiguously identified. In a class of preferred embodiments, the input signal frames are the power spectra of a set of sequentially measured signals. Thus, the set of input signal frames is a "spectrogram," comprising rows and columns of pixels (with row indices representing time, and column indices representing frequency). Alternatively, the input signal frames represent a data array of another type, such as a correlogram or a sequence of images. In a class of embodiments, the input signal frames are processed to identify narrow-band pixels (the subset of input signal frame pixels which represent narrow-band energy, or narrow-band processes). Then, the identified narrow-band pixels (which can be displayed as a narrow-band pixel array) undergo "feature extraction" processing to generate the output narrow-band feature signal (which can be displayed as the output image). The narrow-band feature signal can be further processed to determine the center frequency, bandwidth, and amplitude of one or more of its narrow-band features.
REFERENCES:
A Comparison Of Five Algorithms For Tracking Frequency and Frequency Rate-Of-Change. McIntyre, et al., Proc. ICASSP90, pp. 2899-2902, Apr. 1990.
Maximum A Posteriori Estimation Of Narrow-Band Signal Parameters, Wolcin, J. Acoust. Soc. Am., vol. 68(1), pp. 174-178, Jul. 1980.
A Simple Algorithm For Track Termination, Moll, Proc. ICASSP89, pp. 2700-2703, 1989.
Abel Jonathan S.
Lee Ho J.
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