Patent ID: 7356152
Filing Date: 2008-04-08
Classification: H04R

Abstract:
1. An apparatus for mixing audio signals from a plurality of audio sources, wherein one or more of the audio sources have a first number of output channels and one or more of the audio sources have a second number of output channels, wherein the second number is greater than the first number, and wherein the apparatus comprises: a first mixer including a plurality of output channels and including a plurality of inputs, each of the inputs having input channels coupled to the output channels of a respective audio source in the plurality of audio sources, wherein the output channels of the first mixer are arranged in a first group of one or more output channels and a second group of one or more output channels; a first upmixer including a plurality of output channels and including one or more input channels coupled to the one or more output channels in the first group of output channels of the first mixer; and a second mixer including a plurality of output channels and including a plurality of input channels arranged in a first group of two or more input channels and a second group of one or more input channels, wherein the first group of input channels of the second mixer are coupled to the output channels of the first upmixer and the one or more input channels in the second group of input channels of the second mixer are coupled to the one or more output channels in the second group of output channels of the first mixer.