Title:
METHOD OF AND APPARATUS FOR PROCESSING WIDE BAND SIGNAL HAVING LARGE DYNAMIC RANGE
Document Type and Number:
Japanese Patent JPS5651660
Kind Code:
A
Abstract:
The signal processing method is esp. for echo signals arising in ultrasonic fissure fault testing of materials. An analogue test signal from a detector is amplified in a linear preamplifier. After this amplification the test signal is directly logarithmically digitalised. A logarithmic amplifier, rectifier and a-d converter can be made into an integral unit from which the components cannot be separated out. The logarithmic characteristic of a selected dynamic can be created from the logarithmic characteristics of separate, identical modules. The a-d converter specification can be a conversion rate of 150 MHz and a dynamic of 60dB with a resolution of 0.5 dB. An analogue input signal of 5 volts provides a digital output of 60, and an input of 2.5 volts the number 54. This range is coded in 7 bits the eighth representing the polarity.
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Inventors:
RAIMUNTO RANKU
IERUKU KUBUITSUTOKAATO
MANFUREETO DORAAKU
IERUKU KUBUITSUTOKAATO
MANFUREETO DORAAKU
Application Number:
JP13450480A
Publication Date:
May 09, 1981
Filing Date:
September 29, 1980
Export Citation:
Assignee:
NUKEM GMBH
EDOTRONIK GMBH
EDOTRONIK GMBH
International Classes:
G01H3/12; G01N29/04; G01N29/40; G01N29/44; G01S7/526; G04G7/00; H04B1/64; H04B11/00; (IPC1-7): G01N29/04; G01S7/52
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