| 摘要 |
1534366 Ultrasonic investigation systems EMI Ltd 28 June 1977 [23 July 1976] 30764/76 Heading G1G An arrangement for processing signals representing received pulses of energy which have been subject to attenuation which is a function of their propogation time, e.g. ultrasonic pulses in a human tissue investigation system, comprises means, e.g. as shown in Fig. 2, for converting the signals to logarithmic form and means, e.g. as shown in Fig.4, for effectively subtracting therefrom a further signal representing the logarithm of the attenuation function. Means may be provided for them producing the anti-logarithm of the signals after the subtraction, Fig. 5 (not shown).
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