Adaptive noise filtering in a locomotive environment
AssigneeWestinghouse Air Brake Technologies Corporation
InventorBrian E. Kurz
Life of this patent
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Abstract
A method of noise filtering on a locomotive includes converting sounds received by one or more transducer at first and second period of times into first and second electric signals and comparing a value of a signal that varies with operation, movement, or both of the locomotive to a reference value. When the signal value is one of less than or greater than the reference value during the first period of time, a controller stores a first unfiltered digitized version of the first sound in a memory. When the signal value is the other of less than or greater than the reference value during the second period of time, the controller stores in the memory a second, filtered digitized version of the second sound that is filtered in a frequency spectrum associated with the second sound.
Claims19
A method of noise filtering on a locomotive comprising:
- (a) converting, by a first transducer, a first ambient sound at a first sound pressure level received by the first transducer during a first period of time into a first analog electrical signal;
- (b) converting, by a second transducer, a second ambient sound at a second sound pressure level received by the second transducer during a second period of time into a second analog electrical signal, wherein the second sound pressure level is greater than the first sound pressure level;
- (c) comparing, by a controller comprising one or more processors and memory, a value of a signal associated with operation, movement, or both of the locomotive during the first and second periods of time to a reference value;
- (d) in response to the signal value being one of less than or greater than the reference value during the first period of time, the controller storing in the memory a digitized version of the first analog electrical signal;
- (e) in response to the signal value being the other of less than or greater than the reference value during the second period of time, the controller storing in the memory a digitized and filtered version of the second analog electrical signal.
A method of noise filtering on a locomotive comprising:
- (a) converting, by a transducer, sound received by the transducer at first and second times into first and second electric signals, wherein a sound pressure level of the sound received by the transducer at the second time is greater than the sound pressure level of the sound received by the transducer at the first time;
- (b) comparing, by a controller comprising one or more processors and memory, a value of a signal associated with operation, movement, or both of the locomotive to a reference value;
- (c) in response to the signal value being one of less than or greater than the reference value during the first time, the controller storing in the memory a first digitized version of the first sound;
- and
- (d) in response to the signal value being the other of less than or greater than the reference value during the second time, the controller storing in the memory a second digitized version of the second sound that is filtered in a frequency spectrum associated with the second sound.
Dependencies are inferred from the claim text.