Method and device for spectral expansion of an audio signal
A method and device for automatically increasing the spectral bandwidth of an audio signal including generating a “mapping” (or “prediction”) matrix based on the analysis of a reference wideband signal and a reference narrowband signal, the mapping matrix being a transformation matrix to predict high frequency energy from a low frequency energy envelope, generating an energy envelope analysis of an input narrowband audio signal, generating a resynthesized noise signal by processing a random noise signal with the mapping matrix and the envelope analysis, high-pass filtering the resynthesized noise signal, and summing the high-pass filtered resynthesized noise signal with the input narrowband audio signal. Other embodiments are disclosed.
1. A system, comprising:
an eye glass element, wherein the eyeglass element includes two optical elements, wherein each optical element is configured to be placed before a user's eye when the eyeglass element is used, and wherein each optical element is configured to be transparent so that a user can see through the optical element;
a first microphone connected to the eye glass element on a first side of the eye glass element, wherein the first microphone generates a first acoustic signal;
a second microphone connected to the eye glass element on a second side of the eye glass element, wherein the first side is configured to be on the left side of a user's head when the eye glass computational system is used, and wherein the second side is configured to be on the right side of a user's head when the eyeglass computational system is used, wherein the second microphone generates a second acoustic signal;
a location unit configured to determine the location of the system;
a memory that stores instructions; and
a processor configured to execute the instructions to perform operations, the operations comprising:
determining whether the user is speaking by analyzing the first and second acoustic signals or modifications of the first and second acoustic signals;
extracting an audio signal of the user's voice;
analyzing the audio signal to determine a voice command; and
initiating a response to the voice command.
2. The system of claim 1 , further including a speaker.
3. The system of claim 2 , wherein the operations further comprise sending a signal to the speaker.
4. The system of claim 3 , further including:
an earphone.
5. The system of claim 4 , where the earphone is wirelessly connected to the eyeglass computational system.
6. The system according to claim 5 , where the earphone further includes:
an ambient microphone.
7. The system according to claim 6 , where the earphone further includes:
an ear canal microphone.
8. The system according to claim 7 , where the earphone further includes:
a memory.
9. The system according to claim 8 , where the earphone further includes:
ear sealing device.
10. The system according to claim 9 , where the speaker is part of the earphone.
11. The system according to claim 10 , where the earphone further includes:
a user interface.
12. The system according to claim 11 , wherein the operations further comprise
determining a first location of the system;
storing the location in the memory.