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AssigneeGeneral Electric Company
InventorsRichard Yung Chiao, Theodore Lauer Rhyne
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Harmonic imaging using harmonic Golay-coded excitation that encodes the fundamental and second harmonic signals utilizes the transmit sequences encoded using QPSK implemented as quarter-cycle circular rotations or shifts of the base pulse. This is implemented by time shifting the chips of the transmit sequence encoded with a “j” or “−j” code symbol by ¼ fractional cycle at center frequency relative to the chips encoded with a “1” or “−1” code symbol. A different QPSK transmit code is used for each of four transmits A, B, C and D. The transmit codes are selected such that (A-B) and (C-D) are encoded by Y and −X, respectively, while (A2-B2) and (C2-D2) are encoded by X and Y, respectively, where X and Y form a Golay code pair. The coding and decoding technique achieves fundamental suppression and second harmonic compression for a given Golay code pair X and Y.
A system for transmitting a beam of wave energy, comprising:
A method for operating a transducer array to transmit a beam of wave energy, comprising the steps of driving each transducer element of said transducer array forming a transmit aperture with respective encoded transmit sequences A, B, C, and D during first through fourth transmit firings focused at the same focal position, said encoded transmit sequences comprising a base sequence convolved with respective transmit codes, said transmit codes being selected such that (A-B) and (C-D) are encoded by Y and −X, respectively, while (A2-B2) and (C2-D2) are encoded by X and Y, respectively, where X and Y form a Golay code pair.
An imaging system comprising:
An imaging system comprising:
An imaging system comprising:
A method of operating an imaging system comprising a multiplicity of transducer elements for transmitting wave energy in response to electrical activation and transducing returned wave energy into electrical signals, and a display monitor for displaying an image having an image portion which is a function of an image signal, said method comprising the steps of:
Dependencies are inferred from the claim text.