Systems, methods, apparatus, and computer-readable media for noise injection

摘要

A method of processing an audio signal is described. The method includes selecting one among a plurality of entries of a codebook based on information from the audio signal. The method also includes determining locations, in a frequency domain, of zero-valued elements of a first signal that is based on the selected codebook entry. The method further includes calculating energy of the audio signal at the determined frequency-domain locations. The method additionally includes calculating a value of a measure of a distribution of the energy of the audio signal among the determined frequency-domain locations. The method also includes calculating a noise injection gain factor based on the calculated energy and the calculated value.

主权项

1. A method of processing an audio signal, the method being performed by an audio coding apparatus, said method comprising:
based on information from the audio signal, selecting one among a plurality of entries of a codebook; determining, by the audio coding apparatus, locations, in a frequency domain, of zero-valued elements of a first signal that is based on the selected codebook entry; calculating, by the audio coding apparatus, based on elements of the audio signal which are located at the determined frequency-domain locations, a first energy; calculating, by the audio coding apparatus, an energy distribution value of the audio signal; and based on the calculated first energy and the calculated energy distribution value, calculating, by the audio coding apparatus, a noise injection gain factor.