Spatially constant surround sound

摘要

The invention relates to a method for correcting an input surround sound signal for generating a spatially equilibrated output surround sound signal that is perceived by a user as spatially constant for different sound pressures of the surround sound signal, the input surround sound signal containing front audio signal channels (10.1-10.3) to be output by front loudspeakers (200-1 to 200-3) and rear audio signal channels (10.4, 10.5) to be output by rear loudspeakers. The method comprises the steps of:
- generating a first audio signal channel (14) based on the front signal audio channels,
- generating a second audio signal channel (15) based on the rear signal audio channels
- determining, based on a psychoacoustic model of human hearing, a loudness and a localisation for a combined sound signal including the first audio signal channel (14) and the second audio signal channel (15), wherein the loudness and the localisation is determined for a virtual user (30) located between the front and the rear loudspeakers (200) receiving the first signal (14) from the front loudspeakers (200-1 to 200-3) and the second audio signal (15) from the rear loudspeakers (200-4, 200-5) with a defined head position of the virtual user in which one ear of the virtual user is directed towards one of the front or rear loudspeakers the other ear being directed towards the other of the front or rear loudspeakers,
- adapting the front and/or rear audio signal channels (10.1-10.5) based on the determined loudness and localisation in such a way that, when first and second audio signal channels are output to the virtual user with the defined head position, the audio signals are perceived by the virtual user as spatially constant.