Communications – electrical: acoustic wave systems and devices – Echo systems – Returned signal used for control
Patent
1989-11-13
1990-11-27
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Echo systems
Returned signal used for control
367901, 307358, G01S 1500, H03K 5153
Patent
active
049742140
ABSTRACT:
A method for suppressing interference signals during operation of ultrasonic proximity transducers suppresses the interference signals that are generated by continuous noises. Repeated ultrasonic pulses are transmitted from an ultrasonic proximity transducer, and the received signals are scanned. The scanned values of the received signal are converted into digital values. After storage, the digital values are compared with a step function having one or more step sections of constant value serving as a time-dependent interference noise threshold so that the usable echo signal can be determined and separated from the interference signals. With further evaluation, the echo transit time of the usable echo signal is determined and provided to a control and evaluation unit. By suppressing continuous noises, and further suppressing stochastic interference signals, the usable echo signal is reliably filtered from a reception signal that is overlaid with interference signals.
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IEEE Transactions on Biomedical Engineering, vol. BME-27, No. 5, May 1980, pp. 249-253.
Forster Alfred
Schorner Gerd
Lobo Ian J.
Siemens Aktiengesellschaft
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