Patent ID: 7873171

Claim:
An audio medium playback system, comprising: a receiver for receiving an audio signal with a set of spectral mapping coefficients, and the audio signal is transmitted on a digital medium; a digital signal processor implemented on an integrated circuit (IC) chip, and the digital signal processor configured for performing operations for reproducing on target signal an audio signal present on 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 said aperture periods that vary among said aperture periods, and that, for each band of 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 that is independent of an audio signal decoding process; and applying the spectral mapping coefficients to the audio signal present on the source signal to obtain the audio signal on the target signal; wherein the spectral mapping coefficients correspond to a temporal period; and a digital-to-analog (D/A) converter for converting the target signal into multichannel analog audio output signal; an adjustor for adjusting a level of the multichannel analog audio output signal to a desired level; and an equalizer for equalizing the multichannel analog audio output signal.