Method of decoding two-channel matrix encoded audio to reconstruct multichannel audio
AssigneeDigital Theater Systems, Inc.
InventorsWilliam P. Smith, Stephen M. Smyth, Ming Yan
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Abstract
The present invention provides a method of decoding two-channel matrix encoded audio to reconstruct multichannel audio that more closely approximates a discrete surround-sound presentation. This is accomplished by subband filtering the two-channel matrix encoded audio, mapping each of the subband signals into an expanded sound field to produce multichannel subband signals, and synthesizing those subband signals to reconstruct multichannel audio. By steering the subbands separately about an expanded sound field, various sounds can be simultaneously positioned about the sound field at different points allowing for more accurate placement and more distinct definition of each sound element.
Claims16
A method of decoding two-channel matrix encoded audio to reconstruct multichannel audio that approximates a discrete surround-sound presentation, comprising:
- subband filtering the two-channel matrix encoded audio into a plurality of two-channel subband audio signals;
- separately in each of a plurality of subbands, steering the two-channel subband audio signals in a sound field to form multichannel subband audio signals;
- and
- synthesizing the multichannel subband audio signals in the subbands to reconstruct the multichannel audio.
A method of decoding two-channel matrix encoded audio to reconstruct multichannel audio that approximates a discrete surround-sound presentation, comprising:
- providing two-channel matrix encoded audio that includes at least left, right, center, left surround and right surround (L,R,C,Ls,Rs) audio channels;
- subband filtering the two-channel matrix encoded audio into a plurality of two-channel subband audio signals;
- separately in each of a plurality of subbands, steering the two-channel subband audio signals in an expanded sound field to form multichannel subband audio signals, said sound field having a discrete point for each said audio channel, each said discrete point corresponding to a set of gain values predetermined to produce an optimized audio output at each of L,R,C,Ls,Rs speakers, respectively, when the two-channel subband audio signals are steered to that point in the expanded sound field;
- and
- synthesizing the multichannel subband audio signals in the subbands to reconstruct the multichannel audio.
Dependencies are inferred from the claim text.