Communications – electrical: acoustic wave systems and devices – Echo systems – Speed determination
Patent
1984-02-28
1990-04-03
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Echo systems
Speed determination
367 91, G01S 1560
Patent
active
049146386
ABSTRACT:
A speedometer is provided for determining speed by providing a sound signal at a first frequency, receiving a second signal which is the reflection of the first signal, and determining difference in frequency between the first and second signals created by the Doppler Effect. A speech synthesis chip within the speedometer provides a verbal indication of velocity. In this way, a person using the provided speedometer does not have to look at a dial or other visual indicator.
Provided within the speedometer is a heat-sensitive transducer for measuring the air temperature. In this way, the speedometer can take into account the change in the speed of sound with respect to temperature when calculating velocity.
REFERENCES:
patent: 3719923 (1973-03-01), Waterman
patent: 4135188 (1979-01-01), Bickley, Jr.
patent: 4231039 (1980-10-01), Fritzlen et al.
patent: 4324135 (1982-04-01), Peyton
patent: 4371945 (1983-02-01), Karr et al.
patent: 4566461 (1986-01-01), Lubell et al.
patent: 4581726 (1986-04-01), Makino et al.
Wait et al, Introduction to Operational Amplifier Theory and Applications, May 1975, pp. 170-171.
Applied Design Laboratories, Inc.
Leeds Kenneth E.
Pihulic Daniel T.
Sherrard Michael L.
Tarcza Thomas H.
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