Patent ID: 7965849

Claim:
An audio playback system, comprising: a digital signal processor implemented on an integrated circuit (IC) chip, and the digital signal processor configured for performing operations for reproducing on a target signal an audio signal present on a source signal, the operations comprising: receiving the audio signal organized into successive temporal aperture periods in digital format on the source signal along with a set of spectral mapping coefficients for each of aperture periods that vary among said aperture periods, and that, for each band of the source signal, map a signal level within that band onto desired signal levels for corresponding bands of target signal, where the spectral mapping coefficients are defined by an encoding process performed by an audio signal encoding processor; applying the spectral mapping coefficients to the audio signal present on the source signal by multiplying, the audio signal on each band of the source signal by its respective spectral mapping coefficient; summing results of the multiplications for each band of each source signal; a digital-to-analog (D/A) converter for converting the target signal into a multichannel analog audio output signal.