Patent ID: 7965848

Claim:
Parameter calculator for deriving upmix parameters, the parameter calculator comprising: a parameter recalculator for deriving the upmix parameters from multi-channel parameters using parameters having information on channels not included in an intermediate channel representation, wherein the parameter recalculator is adapted to use correlation parameters (ICC) having information on a correlation and level parameters (CLD) having energy information for a channel or a combination of channels of the multi-channel signal with respect to another channel or another combination of channels of a multi-channel signal, wherein the parameter calculator is configured to use multi-channel parameters for a multi-channel signal comprising a left front (LF), a left surround (LS), a right front (RF), a right surround (RS) and a center channel (C), and the parameter recalculator is operative to derive upmix parameters for an intermediate channel representation having two channels, the upmix parameters including one CLD parameter and one ICC parameter, wherein the parameter recalculator is operative to derive the CLD parameter having energy information for a left and a right channel of the intermediate channel representation using: a first CLD parameter (CLD 0 ) having energy information for a combination of the LF and LR channel and a combination of the remaining channels of the multi-channel signal; a second parameter (CLD 1 ) having energy information for a combination of the LF and RF channel and the center channel (C); a third parameter (CLD 2 ) having energy information for the LS and the RS channel; and a fourth CLD parameter (CLD 3 ) having energy information for the LF and the RF channel, and wherein the parameter calculator comprises a hardware implementation.