Device for detecting, monitoring, and cancelling ghost echoes in an audio signal
First Claim
Patent Images
1. A device comprising:
- an input interface releasably coupled to an audio source;
an output interface releasably coupled to an output device;
a path from the input interface to the output interface to allow a current associated with an audio signal generated by the audio source to reach the output device;
a current sense to sample the current to determine a measured current;
a communication interface to receive the audio signal from the audio source independently from the path;
a modeling component to determine an estimated current based at least in part on the audio signal;
a compare component to determine a ghost echo current based at least in part on the measured current and the estimated current.
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Abstract
In some examples, devices for detecting and measures a ghost echo current in an audio signal are described. For instance, the device may be configured to sample a current of an audio signal, compare with an expected current, and determine an impulse response of the ghost echo current based on the sampled current and the expected current. The device may also be configured to reduce the ghost echo current using the impulse response.
11 Citations
20 Claims
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1. A device comprising:
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an input interface releasably coupled to an audio source; an output interface releasably coupled to an output device; a path from the input interface to the output interface to allow a current associated with an audio signal generated by the audio source to reach the output device; a current sense to sample the current to determine a measured current; a communication interface to receive the audio signal from the audio source independently from the path; a modeling component to determine an estimated current based at least in part on the audio signal; a compare component to determine a ghost echo current based at least in part on the measured current and the estimated current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising:
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causing a first speaker to output sound into a first environment; measuring a first current associated with the sound being output by the first speaker; determining a first impulse response associated with the first current; causing the first speaker to stop outputting the sound into the first environment; causing the first speaker to output the sound into a second environment; measuring a second current associated with the sound being output by the first speaker in the second environment; determining a second impulse response associated with the second current; determining a third impulse response of a first ghost echo current associated with the first current based at least in part by on the first impulse response and a second impulse response; causing the first speaker to stop outputting the sound into the second environment; causing a second speaker to output the sound into the first environment; measuring a third current associated with the sound being output by the second speaker in the first environment; determining a fourth impulse response associated with the third current; and determining a fifth impulse response of a second ghost echo current associated with the second current based at least in part by on the fourth impulse response and the third impulse response. - View Dependent Claims (11, 12, 13, 14, 19, 20)
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15. A method comprising:
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causing a first speaker to output an audio signal as sound into an ear canal; measuring a first current associated with the sound being output by the first speaker; determining a first magnitude associated with a first system response based at least in part on the first current; determining a first phase associated with the first system response based at least in part on the first current; and determining a transfer function of a ghost echo current associated with the first current based at least in part by on the first magnitude, the first phase, a second magnitude, and a second phase, the second magnitude and the second phase determined based at least in part on a second current sampled while the speaker outputs the sound into a second environment, the second environment different from the ear canal and being an acoustic non-reflective environment, the ghost echo current representing a reflection of sound pressure within the ear canal captured by the first speaker, the reflection of sound pressure created in response to movement of a speaker driver of the first speaker within the ear canal. - View Dependent Claims (16, 17, 18)
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Specification