The invention describes a mechanism, in which the ultrasonic impulse is time encoded, by adding a time signal to the main pulse. By alternating between time encoded and normal impulses, it is possible to determinate which of the received signals was send at an even or an uneven cycle. Faulty echo detection is prevented by this method, along with the possibility to double the sending frequency, which leads to twice the penetration depth. Furthermore it is possible to encode the ultrasonic impulse further by using amplitude modulation. With this mechanism, the received signal is spited into a measurement and a encoded signal. By doing so, it is possible to allocate time and volume information to the received signal. Because of this allocation, the occurrence of artifacts is further reduced, which leads to a higher quality of ultrasonic scans.
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