Method and apparatus for detecting audio sampling rate

摘要

It is inter alia disclosed to receive a set of encoded audio parameters for an audio frame, wherein the set comprises indices representing at least two quantized line spectral frequency coefficients, wherein the audio frame when decoded comprises audio samples digitally sampled at a sampling frequency, wherein the sampling frequency is one of a plurality of sampling frequencies for an audio decoder; to convert the indices to the at least two quantized line spectral frequency coefficients; and to determine the sampling frequency for the audio frame by checking the value of a highest order quantized line spectral frequency coefficient of the at least two quantized line spectral frequency coefficients.

主权项

1. A method comprising:
determining at least two linear prediction coefficients for an audio frame digitally sampled at a first sampling rate; converting the at least two linear prediction coefficients to at least two line spectral frequency coefficients; and quantizing each of the at least two line spectral frequency coefficients to produce at least two quantized line spectral frequency coefficients, wherein a highest order quantized line spectral frequency coefficient of the at least two quantized line spectral frequency coefficients is in a first frequency range of at least two frequency ranges, wherein the first frequency range is associated with the first sampling rate, and wherein the first frequency range is distinguishable from a second frequency range of the at least two frequency ranges, wherein the second frequency range is associated with a highest order quantized line spectral frequency for an audio frame digitally sampled at a second sampling rate.