CPC G10L 19/008 (2013.01) [G10L 19/0212 (2013.01); G10L 19/06 (2013.01); G10L 19/167 (2013.01); G10L 19/18 (2013.01); H04S 3/008 (2013.01); G10L 25/12 (2013.01); H04S 2400/01 (2013.01)] | 6 Claims |
1. A decoder system for providing a stereo signal by complex prediction stereo decoding, the decoder system comprising:
an upmix stage adapted to generate the stereo signal based on first frequency-domain representations of a downmix signal and a residual signal, each of the first frequency-domain representations comprising first spectral components representing spectral content of the corresponding signal expressed in a first subspace of a multidimensional space, the upmix stage comprising:
a module for computing a second frequency-domain representation of the downmix signal based on the first frequency-domain representation of the downmix signal, the second frequency-domain representation comprising second spectral components representing spectral content of the downmix signal expressed in a second subspace of the multidimensional space that includes a portion of the multidimensional space not included in the first subspace;
a weighted summer for computing a side signal by combining the first frequency-domain representation of the residual signal, the first frequency-domain representation of the downmix signal weighted by a real-valued part of a complex prediction coefficient, and the second frequency-domain representation of the downmix signal weighted by an imaginary-valued part of the complex prediction coefficient; and
a sum-and-difference stage for computing the stereo signal based on the first frequency-domain representation of the downmix signal and the side signal;
a first frequency-domain modifier stage arranged upstream of the upmix stage and operable in an active mode, in which it processes a frequency-domain representation of at least one signal, and a passive mode, in which it acts as a pass-through; and
a second frequency-domain modifier stage arranged downstream of the upmix stage and operable in an active mode, in which it processes a frequency-domain representation of at least one signal, and a passive mode, in which it acts as a pass-through.
|