Method and apparatus for detecting audio sampling rate
AssigneeNokia Technologies Oy
InventorsAnssi Sakari Ramo, Adriana Vasilache, Lasse Juhani Laaksonen
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Abstract
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.
Claims16
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.
An apparatus comprising at least one processor and at least one memory including computer code for one or more programs, the at least one memory and the computer code configured to with the at least one processor cause the apparatus to:
- determine at least two linear prediction coefficients for an audio frame digitally sampled at a first sampling rate;
- convert the at least two linear prediction coefficients to at least two line spectral frequency coefficients;
- and
- quantize 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.
A method comprising:
- receiving 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;
- converting the indices to the at least two quantized line spectral frequency coefficients;
- and
- determining the sampling frequency for the audio frame by checking a value of a highest order quantized line spectral frequency coefficient of the at least two quantized line spectral frequency coefficients.
An apparatus comprising at least one processor and at least one memory including computer code for one or more programs, the at least one memory and the computer code configured to with the at least one processor cause the apparatus 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;
- convert the indices to the at least two quantized line spectral frequency coefficients;
- and
- determine the sampling frequency for the audio frame by checking a value of a highest order quantized line spectral frequency coefficient of the at least two quantized line spectral frequency coefficients.
Dependencies are inferred from the claim text.