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.
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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; determining a second impulse response of a ghost echo current associated with the first current based at least in part by on the first impulse response and a third impulse response, the third impulse response determined based at least in part on a second current sampled while the speaker output the sound into second environment, the second environment being a acoustic non-reflective environment. - View Dependent Claims (11, 12, 13, 14, 15)
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16. 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 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 output the sound into second environment, the second environment being a acoustic non-reflective environment. - View Dependent Claims (17, 18, 19, 20)
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Specification