Method and apparatus for encoding and decoding an audio signal

Method and apparatus for encoding and decoding an audio signal

  • CN 101,253,807 B
  • Filed: 08/30/2006
  • Issued: 04/02/2014
  • Est. Priority Date: 08/30/2005
  • Status: Active Grant
First Claim
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1. a method for decoded audio signal, described sound signal comprises down-mix audio signal and spatial information, and described spatial information comprises residual signals, and described method comprises:

  • Reception comprises the described sound signal of described down-mix audio signal and described spatial information;

    Extract the gap information of variable bit length and the residual error information of fixed bit length, described gap information indication to its apply parameter set time slot position and the indication of described residual error information applies the number of the parameter band of described residual signals to it;

    The down-mix audio signal receiving by decoding is exported described down-mix audio signal;

    AndBased on described gap information and described residual error information by using described parameter set and described residual signals to carry out channel expansion audio mixing to generate multi-channel audio signal to described down-mix audio signal,Wherein;

    In the situation that air-frame is variable frame type, described gap information comprises absolute value and difference,Described absolute value indication applies the position of the time slot of the first parameter set to it,The indication of described difference applies second or the position of the time slot of senior staff officer'"'"'s manifold more to it,Described absolute value is by representing with the bit number that number of time slot and parameter set number calculate, andDescribed difference is by representing with the bit number that number of time slot, parameter set number and position calculation that it is applied to the time slot of last parameter set obtain.

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