Method and device for spectral expansion of an audio signal
AssigneeStaton Techiya LLC
InventorsJohn Usher, Dan Ellis
Life of this patent
Estimating the term…
Abstract
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.
Claims17
A method comprising:
- receiving a command to initiate communication in a noisy environment;
- retrieving a wideband reference signal and narrowband reference signal from memory, wherein the narrowband reference signal was generated from an ear canal microphone in an earpiece, and the wideband reference signal was generated from an ambient sound microphone in the same earpiece;
- receiving an ear canal signal;
- generating a modified ear canal signal by spectrally expanding the ear canal signal using the wideband reference signal and the narrowband reference signal;
- and
- sending the modified ear canal signal to a communication device.
A method comprising:
- receiving a command to initiate communication in a noisy environment;
- receiving a wideband reference signal and narrowband reference signal, wherein the narrowband reference signal was generated from an ear canal microphone in an earpiece of a remote communication system, and the wideband reference signal was generated from an ambient sound microphone in the same earpiece;
- receiving an ear canal signal from the remote communication system;
- generating a modified ear canal signal by spectrally expanding the ear canal signal using the wideband reference signal and the narrowband reference signal;
- and
- sending the modified ear canal signal to a speaker of a communication system worn by a user.
Dependencies are inferred from the claim text.