| 摘要 |
PROBLEM TO BE SOLVED: To provide a transmitter, varying delay, apodization, modulation frequency and filter characteristic in every scan line. SOLUTION: This system includes a plurality of multi-channel transmitters. Each channel includes a source of initial waveform information (T410) of sampled complex-valued initial waveform information representative of the ultimate desired waveform to be applied to one or more corresponding trandsducer elements for each beam. Each multi-channel transmitter applies beamformation delays (T422) and apodization (T420) to each channel's respective initial waveform information digitally, digitally modulates the information by a carrier frequency (T424), and interpolates the informaiton to the DAC (T428) sample rate for conversion to an analog signal and application to the associated transducer elements (T426). COPYRIGHT: (C)2006,JPO&NCIPI
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