Patent ID: 8239050
Filing Date: 2012-08-07
Classification: G10L,H04S

Abstract:
1. A method for measuring the loudness of audio encoded in a bitstream that includes data from which an approximation of the power spectrum of the audio can be derived without fully decoding the audio, comprising deriving said approximation of the power spectrum of the audio from said bitstream without fully decoding the audio, and determining an approximate loudness of the audio in response to the approximation of the power spectrum of the audio, wherein (a) said data includes coarse representations of the audio and associated finer representations of the audio, (b) said approximation of the power spectrum of the audio is derived from the coarse representations of the audio, and (c) the audio encoded in a bitstream is linear predictive coded audio in which the coarse representations of the audio comprise linear predictive coefficients and the finer representations of the audio comprise excitation information associated with the linear predictive coefficients.