Temporal gain adjustment based on high-band signal characteristic

摘要

The present disclosure provides techniques for adjusting a temporal gain parameter and for adjusting linear prediction coefficients. A value of the temporal gain parameter may be based on a comparison of a synthesized high-band portion of an audio signal to a high-band portion of the audio signal. If a signal characteristic of an upper frequency range of the high-band portion satisfies a first threshold, the temporal gain parameter may be adjusted. A linear prediction (LP) gain may be determined based on an LP gain operation that uses a first value for an LP order. The LP gain may be associated with an energy level of an LP synthesis filter. The LP order may be reduced if the LP gain satisfies a second threshold.

主权项

1. A method of audio coding by adjusting linear prediction coefficients (LPCs) of an encoder, the method comprising:
determining, at the encoder, a linear prediction (LP) gain based on an LP gain operation that uses a first value for an LP order, the LP gain associated with an energy level of an LP synthesis filter; comparing the LP gain to a threshold; reducing the LP order from the first value to a second value if the LP gain is greater than the threshold; transforming the LPCs to line spectral pairs (LSPs), the LPCs based on the LP order; and transmitting the LSPs as part of a bit-stream from the encoder to a receiver.