Communications – electrical: acoustic wave systems and devices – Testing – monitoring – or calibrating
Patent
1991-10-04
1992-05-26
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Testing, monitoring, or calibrating
H04B 1700
Patent
active
051173972
ABSTRACT:
An apparatus is provided for simulating a planar wavefront propagating at a nown frequency and incident upon an imaginary linear array of receiving elements at a known angle of incidence. A master clock generates a clock signal at a selected frequency. A frequency divisor and time delay divisor are generated based upon the master clock's frequency, spacing between the receiving elements, frequency of propagation, angle of incidence, and wavefront propagation speed. Frequency generation counters are provided such that each is connected to receive the master clock signal and the frequency divisor. A time delay counter is connected to receive the master clock signal and the time delay divisor to generate a pulse every T seconds where T is the time difference associated with receiving the planar wavefront at any two adjacent receiving elements. A delay enable shift register is connected to the time delay counter to receive the generated pulse every T seconds. Enable lines of the shift register are successively set HIGH in response to the generated pulse. Each of the enable lines is connected to a corresponding one of the frequency generation counters. In this way, a signal is generated at the known frequency of propagation at each one of the corresponding frequency generation counters when its enable line is set HIGH.
REFERENCES:
patent: 4972381 (1990-11-01), Mitchell et al.
Lall Prithvi C.
McGowan Michael J.
Oglo Michael F.
Pihulic Daniel T.
The United States of America as represented by the Secretary of
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