Measuring and testing – Vibration – By mechanical waves
Patent
1982-09-29
1984-11-27
Birmiel, Howard A.
Measuring and testing
Vibration
By mechanical waves
364200, 364900, 73628, 367105, G01N 2900, G06F 1306
Patent
active
044844778
ABSTRACT:
A variable delay memory system (200) has an addressable memory means (66-1) having a data input port and a data output port. A counter (206) is connected to supply a write address on bus (212) for storage of data supplied to the data input port on bus (64-1). A subtracter means (214) is connected to receive the write address as one input on bus (210) and a second input proportional to a desired delay time on bus (72-1). The subtracter means (214) is connected to supply its output as a read address on bus (216) for data stored in the memory means (66-1) to be supplied at the data output port on bus (76-1). The variable delay memory system (200) is particularly adapted for use of its addressable memory means (66-1) as a delay line in an ultrasonic imaging system (50) with the second input proportional to a desired delay time being supplied by a correlator ( 70) on the basis of cross-correlations between the RF signals supplied on bus (64-1) and the RF signals supplied on corresponding buses (64-2) through (64-21) for other variable delay memory systems connected to the other channels of the ultrasonic imaging system (50).
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patent: 3761880 (1973-09-01), Kritz et al.
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patent: 4070905 (1978-01-01), Kossoff
patent: 4134149 (1979-01-01), Nord
patent: 4234940 (1980-11-01), Iinuma
patent: 4257256 (1981-03-01), Yoshikawa
patent: 4267584 (1981-05-01), McKeighen et al.
patent: 4290310 (1981-09-01), Anderson
Birmiel Howard A.
Faubion Urban H.
Gregg Edward B.
Higgins Willis E.
S R I International
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