Gain shape estimation for improved tracking of high-band temporal characteristics

摘要

A method includes determining, at a speech encoder, first gain shape parameters based on a harmonically extended signal and/or based on a high-band residual signal associated with a high-band portion of an audio signal. The method also includes determining second gain shape parameters based on a synthesized high-band signal and based on the high-band portion of the audio signal. The method further includes inserting the first gain parameters and the second gain shape parameters into an encoded version of the audio signal to enable gain adjustment during reproduction of the audio signal from the encoded version of the audio signal.

主权项

1. A method comprising:
performing a first determination, at a speech encoder, of first gain shape parameters based at least in part on energy levels of a first plurality of sub-frames of a harmonically extended signal, based at least in part on energy levels of a second plurality of sub-frames of a high-band residual signal associated with a high-band portion of an audio signal, or any combination thereof; generating a high-band excitation signal based at least in part on the first gain shape parameters; generating a synthesized high-band signal based on the high-band excitation signal; performing a second determination of second gain shape parameters based on the synthesized high-band signal and based on the high-band portion of the audio signal; and inserting the first gain shape parameters and the second gain shape parameters into an encoded version of the audio signal.