Method for the suppression of interference signals during operat

Details Method for the suppression of interference signals during operat Method for the suppression of interference signals during operat

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.

REFERENCES:
patent: 4176337 (1979-11-01), Aechter et al.
patent: 4222275 (1980-09-01), Sholl et al.
patent: 4315325 (1982-02-01), Blades
patent: 4596144 (1986-06-01), Panton et al.
patent: 4649527 (1987-03-01), Forster et al.
patent: 4677599 (1987-06-01), Obayashi et al.
patent: 4679175 (1987-07-01), Eder et al.
patent: 4829490 (1989-05-01), Parker
IEEE Transactions on Biomedical Engineering, vol. BME-27, No. 5, May 1980, pp. 249-253.

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