| 摘要 |
<p>An architecture in which a plurality of delay calculators (28) are distributed throughout the beamformer. Each delay calculator (28) provides beamforming delays and apodization values for a plurality of channels (32)/elements (34). The delay calculators (28) are initialized with element position coordinates. Then, while imaging, focal coordinates and steering angles are broadcast to all delay calculators (28). The delay calculator (28) uses a cordic rotator to perform the aperture projections and calculate the hypotenuse. The cordic rotator performs successive coordinate transformations, in two dimensions, using coefficients that are simple powers of two. The resulting apodization values and time delays are then provided by a channel control bus (30) to a plurality of channels (32).</p> |
