#$%^&*AU2018203785B220191017.pdf#####ABSTRACT Techniques, systems, and devices are disclosed for ultrasound imaging using spread spectrum, coherent, frequency- and/or phase-coded waveforms. In one aspect, a method of creating an image from an acoustic waveform in an acoustic imaging device includes setting the device into a transmit mode to transmit an acoustic waveform toward a target, in transmitting the acoustic waveform, synthesizing, in one or more waveform synthesizers, a plurality of substantially orthogonal coded waveforms that form a composite waveform as the transmitted acoustic waveform toward the target, in which each waveform corresponds to a distinct frequency band, setting the device into a receive mode to receive a returned acoustic waveform that returns from at least part of the target, converting the received returned acoustic waveform from analog format to digital format as a received composite waveform comprising information of the target, and processing the received composite waveform to produce an image of the target.WO 2013/066821 PCT/US2012/062435 1/6 Output Waveform Synthesizer 100 Amplifiers and Beam Controller (109) (108) Transducer Array (111) Comprised of - TR . 1 Waveform Number of Elements Switch 2 Generator (107) - - Daa& Control Bus (103) Pre-- ~ -Amplifiers MasterSystem (112) L Cloc Controller (11 (102) AID Convwerters (113) Display (105 Digital Signal Processor User (104) Interface (1 FIG.1A
