Systems and methods for adaptive active noise cancellation for multiple-driver personal audio device
First Claim
1. An integrated circuit for implementing at least a portion of a personal audio device, comprising:
- a first output for providing a first output signal to a first transducer for reproducing a first frequency range content source audio signal comprising first frequency range content of a source audio signal, the first output signal including both the first frequency content source audio signal and an antinoise signal for countering the effects of ambient audio sounds in an acoustic output of an earspeaker comprising the first transducer and a second transducer;
a second output for providing a second output signal to the second transducer for reproducing a second frequency range content source audio signal comprising second frequency range content of the source audio signal, the second output signal including at least the second frequency range content source audio signal;
a reference microphone input for receiving a reference microphone signal indicative of the ambient audio sounds;
an error microphone input for receiving an error microphone signal indicative of the output of the earspeaker and the ambient audio sounds at the earspeaker; and
a processing circuit comprising;
an adaptive filter having a response that generates the antinoise signal from the reference microphone signal to reduce the presence of the ambient audio sounds at the acoustic output, wherein the response of the adaptive filter is shaped in conformity with the reference microphone signal and the error microphone signal by adapting the response of the adaptive filter to minimize the ambient audio sounds in the error microphone signal;
a first signal injection portion which injects a first additional signal into the first frequency range content source audio signal; and
a second signal injection portion which injects a second additional signal into the second frequency range content source audio signal, wherein the first additional signal and the second additional signal are substantially different.
2 Assignments
0 Petitions
Accused Products
Abstract
In accordance with embodiments of the present disclosure, a processing circuit may implement an adaptive filter, a first signal injection portion which injects a first additional signal into a first frequency range content source audio signal, and a second signal injection portion which injects a second additional signal into a second frequency range content source audio signal, wherein the first additional signal and the second additional signal are substantially different. The adaptive filter may have a response that generates the antinoise signal from the reference microphone signal to reduce the presence of the ambient audio sounds at the acoustic output, wherein the response of the adaptive filter is shaped in conformity with the reference microphone signal and the error microphone signal by adapting the response of the adaptive filter to minimize the ambient audio sounds in the error microphone signal, wherein the antinoise signal is combined with at least the first frequency range content source audio signal.
-
Citations
20 Claims
-
1. An integrated circuit for implementing at least a portion of a personal audio device, comprising:
-
a first output for providing a first output signal to a first transducer for reproducing a first frequency range content source audio signal comprising first frequency range content of a source audio signal, the first output signal including both the first frequency content source audio signal and an antinoise signal for countering the effects of ambient audio sounds in an acoustic output of an earspeaker comprising the first transducer and a second transducer; a second output for providing a second output signal to the second transducer for reproducing a second frequency range content source audio signal comprising second frequency range content of the source audio signal, the second output signal including at least the second frequency range content source audio signal; a reference microphone input for receiving a reference microphone signal indicative of the ambient audio sounds; an error microphone input for receiving an error microphone signal indicative of the output of the earspeaker and the ambient audio sounds at the earspeaker; and a processing circuit comprising; an adaptive filter having a response that generates the antinoise signal from the reference microphone signal to reduce the presence of the ambient audio sounds at the acoustic output, wherein the response of the adaptive filter is shaped in conformity with the reference microphone signal and the error microphone signal by adapting the response of the adaptive filter to minimize the ambient audio sounds in the error microphone signal; a first signal injection portion which injects a first additional signal into the first frequency range content source audio signal; and a second signal injection portion which injects a second additional signal into the second frequency range content source audio signal, wherein the first additional signal and the second additional signal are substantially different. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A method comprising:
-
generating a source audio signal for playback to a listener; receiving a reference microphone signal indicative of ambient audio sounds; receiving an error microphone signal indicative of an output of an earspeaker and the ambient audio sounds at the earspeaker, wherein the earspeaker comprises a first transducer for reproducing a first frequency range content source audio signal comprising first frequency range content of the source audio signal and a second transducer for reproducing a second frequency range content source audio signal comprising second frequency range content of the source audio signal; adaptively generating an antinoise signal for countering the effects of ambient audio sounds at an acoustic output of the earspeaker by adapting a response of an adaptive filter that filters the reference microphone signal in conformity with the error microphone signal and the reference microphone signal to minimize the ambient audio sounds in the error microphone signal; injecting a first additional signal into the first frequency range content source audio signal; injecting a second additional signal into the second frequency range content source audio signal, wherein the first additional signal and the second additional signal are substantially different; combining the antinoise signal with the first frequency range content source audio signal to generate a first output signal provided to the first transducer; and generating a second output signal provided to the second transducer, the second output signal including at least the second frequency range content source audio signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification