Method and device for applying dynamic range compression to a higher order ambisonics signal

Abstract

This invention relates to a method for performing dynamic range control (DRC) on a high-fidelity stereo (HOA) signal. Since it is not possible to simply apply DRC to a HOA as the base signal, the method includes: transforming the HOA signal to the spatial domain, analyzing the transformed HOA signal, and deriving a gain factor from the analysis result that can be used for dynamic compression. The gain factor can be transmitted along with the HOA signal. When applying DRC, the HOA signal is transformed to the spatial domain, the gain factor is extracted, and the gain factor is multiplied with the transformed HOA signal in the spatial domain to obtain a gain-compensated transformed HOA signal. The gain-compensated transformed HOA signal is then transformed back to the HOA domain to obtain a gain-compensated HOA signal.

Claims

1. A method for applying dynamic range compression (DRC) to a high-order stereo (HOA) signal in the time domain, the method comprising: determining one or more DRC gains; applying the one or more DRC gains to the HOA signal in the time domain using a spatial transformation; and presenting the HOA signal to obtain at least one audio signal for playback.

2. The method of request 1, wherein the spatial transformation is with respect to the spherical harmonic domain.

3. The method of claim 1, wherein applying the one or more DRC gains further includes transforming the HOA signal between the coefficient domain and the spatial domain.

4. A non-transitory computer-readable storage medium having computer-executable instructions that, when executed by a computer, cause the computer to perform the method of claim 1.

5. An apparatus for applying dynamic range compression (DRC) to a high-order stereo (HOA) signal in the time domain, the apparatus comprising a processor configured to: determine one or more DRC gains; apply the one or more DRC gains to the HOA signal in the time domain using a spatial transformation; and present the HOA signal to obtain at least one audio signal for playback.

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