| 摘要 |
A device for forming an image of an object by means of ultrasound beams, comprising an array (1) of electroacoustic transducers, means for connecting a selected group of transducers to a delay unit (17) which is arranged to delay the electric signal generated by each transducer of the group by a predetermined period of time and to sum the delayed signals in order to form a resultant signal which is an electrical representation of the acoustic signals originating from a selected distance or from a selected direction. The delay unit (17) is formed by a tapped delay line (19), whose taps (21) serve as inputs for the signals originating from the various transducers and whose output (23) is connected to a signal processing device (25) for the further processing of the resultant signal. Signals are applied to the taps through current sources. The applied signals may be selectively attenuated to effect apodization of the ultrasound beam.
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