Audio signal processing method
The present invention relates to an audio signal processing method, comprising the steps of: receiving a bit-stream containing a normal channel signal and an exceptional channel signal; decoding the normal channel signal and the exceptional channel signal from the received bit-stream; generating correlation information using the decoded normal channel signal and the decoded exceptional channel signal; generating a gain value by at least one of a first downmix method applying the same downmix gain value using the correlation information and a second downmix method applying variable gain values over time; and outputting the exceptional channel signal as a plurality of channel signals using the gain value.
1. An audio signal processing method, comprising:
receiving a bit-stream including both a normal channel signal and an exceptional channel signal;
decoding the exceptional channel signal and the normal channel signal from the received bit-stream;
decoding channel configuration information from the received bit-stream;
receiving speaker position information of a reproduction end;
deriving a gain value based on at least one among the channel configuration information and the speaker position information of the reproduction end;
compensating for the gain value and delay for each speaker; and
outputting the exceptional channel signal as multiple channel signals using the gain value,
wherein the compensating for the gain value and the delay are performed based on the speaker position information,
wherein the deriving the gain value comprises delivering a sum of absolute values of differences for all speakers, each of the differences being a difference between a sneaker position of the reproduction end and a corresponding speaker position according to a standard specification, and
wherein the deriving the gain value for at least one speaker among the all speakers is performed adaptively based on the sum of absolute values of the differences.
2. The audio signal processing method of claim 1 , wherein speaker position information according to a standard specification is derived based on the channel configuration information, and
wherein at least one among the speaker position information according to the standard specification and the speaker position information of the reproduction end comprise information on at least one among azimuth and elevation of a speaker.
3. The audio signal processing method of claim 1 , the speaker position information of the reproduction end is represented as a difference between a speaker position of the reproduction end and a speaker position according to the standard specification.
4. The audio signal processing method of claim 1 , wherein the deriving the sum is performed without considering a LFE channel.
5. The audio signal processing method of claim 1 , wherein the deriving the gain value calculates the gain value for a speaker of the reproduction end using VBAP (Vector Based Amplitude Panning).
6. The audio signal processing method of claim 1 , wherein the exceptional channel signal is a VoG (Voice of God) signal.