Signal cancellation
AssigneeLectronix, Inc.
InventorEarl Goodrich, II
Life of this patent
Estimating the term…
Abstract
Signal cancellation is contemplated. The signal cancellation may include canceling a signal from another signal in order to facilitate further processing of the another signal. The signal cancellation may be beneficial within environments where the signal being canceled is intentionally introduced or its contents/characteristics are otherwise known prior to being exposed to the signal from which it is to be canceled.
Claims20
A method for canceling a siren signal from a microphone signal, the siren signal being output from a siren included within a vehicle, the microphone signal being generated with a microphone included within the vehicle, the method comprising:
- determining a fundamental frequency of the siren signal;
- sampling the microphone signal;
- canceling the siren signal from the microphone signal, including adding the microphone signal sampled at a first interval to the microphone signal sampled at a second interval, the second interval being offset in time from the first interval by one-half of an inverse of the fundamental frequency.
A method of filtering an interference signal from a microphone signal, the microphone signal being recorded with a microphone exposed to the interference signal, the interference signal being intentionally produced with a signal generator, the method comprising:
- adding an a first portion of the microphone signal to a second portion of the microphone signal, the second portion occurring in time after the first interval by an amount of time proportional to a fundamental frequency of the interference signal.
An acoustics system comprising:
- a signal generator configured to generate a first signal;
- an amplifier configured to convert the first signal to a second signal, the second signal being acoustically broadcasted from the amplifier;
- a microphone configured to facilitate sampling a third signal, the third signal representing sound ambient to the microphone, the microphone being exposed to the second signal such that the third signal at least partially represents the second signal;
- and
- a cancellation device configured to output a fourth signal, the fourth signal representing with the third signal after cancellation of at least a portion of the second signal.
Dependencies are inferred from the claim text.