Method of detecting a predetermined frequency band in an audio data signal, detection device and computer program corresponding thereto

A detection device for detecting a predetermined frequency band in an audio data signal which has been previously coded according to a succession of data blocks, among which at least certain blocks contain respectively at least one set of spectral parameters representing a linear predictive filter, the detection device comprising:

• a non-transitory computer-readable medium comprising instructions stored thereon;
• and
• a processor configured by the instructions to perform acts of:
• processing a current block among said at least certain blocks and of which at least one plurality of spectral parameters of said set have been previously decoded, which comprises:
• receiving the least one plurality of previously decoded spectral parameters of said set,
• determining, among said plurality of previously decoded spectral parameters, the index of the first spectral parameter closest to a threshold frequency,
• calculating at least one criterion on the basis of said index determined,
• deciding whether said predetermined frequency band is detected in said current block, as a function of the criterion calculated,
• generating an indicator, which is representative of the decision whether said predetermined frequency band is detected in said current block, and
• classifying the audio signal based on the indicator.

A non-transitory recording medium readable by a computer on which is recorded a computer program comprising instructions for execution of a method of detection, when said program is executed by a computer of a detection device, wherein the method comprises:

• detecting a predetermined frequency band in an audio data signal which has been previously coded according to a succession of data blocks, among which at least certain blocks contain respectively at least one set of spectral parameters representing a linear predictive filter, wherein detecting implements, for a current block among said at least certain blocks and of which at least one plurality of spectral parameters of said set have been previously decoded, the following acts performed by the computer of the detection device:
• receiving the least one plurality of previously decoded spectral parameters of said set,
• determining, among said plurality of previously decoded spectral parameters, an index of the first spectral parameter closest to a threshold frequency,
• calculating at least one criterion on the basis of said index determined,
• deciding whether said predetermined frequency band is detected in said current block, as a function of the criterion calculated,
• generating an indicator, which is representative of the decision whether said predetermined frequency band is detected in said current block, and
• classifying the audio signal based on the indicator.