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Patent
Title
Vorrichtung zur zeit- und ortsaufgeloesten Ortung eines miniaturisierten Ultraschall-Senders
Other Title
Ultrasonic communication system for location of diagnostic capsule - performs tracking of ingested capsule by correlation of received and memorised PCM sequences with high temporal and spatial resolution.
Abstract
The encapsulated transmitter combines a fundamental-frequency oscillator (1) with a pulse sequence generator (2) and a pulse phase encoder (3) which may generate Barker codes or pseudonoise or m-sequences. The fundamental frequency (f0) is modulated (4) with the code for the driver (5) of the ultrasonic emitter (6). The receiver (11) feeds a preamplifier (12) and mixer (13) with quadrature channels in which a low-pass filter and digitiser are followed by a digital correlator (DK) using a stored sequence of transmission pulses as a reference. USE - Particularly for investigation of intestinal activity, the transmitter can be made smaller and less susceptible to noise, without loss of accuracy of its location.
Inventor(s)
Rupp, J.
Heidmann, D.
Schmitt, R.
Bresser, B.
Patent Number
1996-19609564
Publication Date
1997
Language
German