Spatial sound reproduction

摘要

An apparatus for spatial sound reproduction comprises a receiver (101) for receiving a multi-channel audio signal. An analyzer (107) determines a spatial property of the multi-channel audio signal, such as a spatial complexity or organization. A selection processor (109) then selects a reproduction mode from a plurality of sound reproduction modes where the multi-channel sound reproduction modes employ different spatial rendering techniques. A reproduction circuit (103) then drives a set of loudspeakers (105) to reproduce the multi-channel audio signal using the selected reproduction mode. The switching between the reproduction modes may be fast (e.g. in the order of 100 ms to 10 secs) thereby allowing a short term adaptation of the reproduction mode to the signal characteristics. The approach may in particular provide an improved spatial experience to a listener.

主权项

1. An apparatus for spatial sound reproduction, the apparatus comprising:
a receiver for receiving a multi-channel audio signal; a circuit for determining a spatial property of the received multi-channel audio signal; a circuit for generating a mode selection signal for automatically selecting a selected reproduction mode from a plurality of sound reproduction modes in response to the determined spatial property, the sound reproduction modes employing different spatial rendering techniques; and a reproduction circuit coupled to the receiver to receive the multi-channel audio signal, said reproduction circuit having circuitry for generating drive signals from the multi-channel audio signal for driving a set of spatial channels provided by a set of loudspeakers, said circuitry processing the multi-channel audio signal in response to the mode selection signal to generate the drive signals in accordance with the selected reproduction mode, wherein the plurality of sound reproduction modes comprises at least two of: a monophonic reproduction mode, a reproduction mode maintaining spatial characteristics of the multi-channel signal as received by the receiver, a reproduction mode comprising spatial widening processing, and a reproduction mode comprising a separation into at least one dominant source signal and an ambiance signal, and applying different spatial reproduction of the at least one primary source signal and the ambiance signal, wherein said apparatus further comprises: a circuit for determining a content characteristic for the multi-channel audio signal, wherein the circuit for selecting is arranged to further generate the mode selection signal for selecting the selected reproduction mode in response to the content characteristic and wherein the reproduction circuit is arranged to receive the content characteristic, and the circuitry for generating the drive signals from the multi-channel audio signal is arranged to adapt a characteristic of a spatial rendering technique of the selected reproduction mode in response to the content characteristic.