Conventional stereophonic processes allow playback of mono audio signals with a stereo effect. The stereo effect is limited to mimicking ambience or signal independent left/right separation and thus no realistic sound stage is reproduced. This paper proposes two techniques for converting old mono recordings to two or more channel stereo signals with a realistic sound stage and ambience. One technique is fully automatic and imposes the auditory spatial image of a given modern stereo recording onto a corresponding old mono recording. The other technique is based on manual input of a sound engineer to generate a desired sound stage and ambience. The underlying mono-to-stereo synthesis process is the same as has been recently proposed for use in low bitrate audio coding.
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