Audio signal of an FM stereo radio receiver by using parametric stereo

摘要

The invention relates to an apparatus for improving a stereo audio signal of an FM stereo radio receiver. The apparatus comprises a parametric stereo (PS) parameter estimation stage. The parameter estimation stage is configured to determine one or more parametric stereo parameters based on the stereo audio signal in a frequency-variant or frequency-invariant manner. Preferably, these PS parameters are time- and frequency-variant. Moreover, the apparatus comprises an upmix stage. The upmix stage is configured to generate the improved stereo signal based on a first audio signal and the one or more parametric stereo parameters. The first audio signal is obtained from the stereo audio signal, e.g. by a downmix operation in a downmix stage. The PS parameter estimation stage may be part of a PS encoder. The upmix stage may be part of a PS decoder.

主权项

1. An apparatus for improving a left/right or mid/side audio signal output by an FM stereo radio receiver, the apparatus comprising:
an input stage configured to receive the left/right or mid/side audio signal from the FM stereo radio receiver; a downmix stage, the downmix stage configured to generate a first audio signal based on the left/right or mid/side audio signal by a downmix operation; a parametric stereo parameter estimation stage, the parameter estimation stage configured to determine one or more parametric stereo parameters based on the left/right or mid/side audio signal in a frequency-variant or frequency-invariant manner; and a stereo mixing module, the stereo mixing module configured to generate a stereo signal based on the first audio signal and the one or more parametric stereo parameters; wherein the downmix stage, the parametric stereo parameter estimation stage and the stereo mixing module are implemented in a same module.