JPWO2020081674A5

JPWO2020081674A5 -

Info

Publication number: JPWO2020081674A5
Application number: JP2020546495A
Authority: JP
Publication date: 2022-10-21
Anticipated expiration: 2039-10-16

Claims

An audio processing method, the method comprising:
receiving audio data having a plurality of audio objects, the audio objects including audio data and associated metadata, the metadata including audio object position data;
receiving playback speaker layout data having an indication of one or more playback speakers within a playback environment and an indication of a position of the one or more playback speakers within the playback environment; the data includes LFC speaker position data corresponding to two or more low frequency compatible (LFC) playback speakers of the playback environment and main speaker position data corresponding to one or more main playback speakers of the playback environment;
Rendering the plurality of audio objects into a plurality of speaker feed signals based at least in part on the associated metadata and the playback speaker layout data, each speaker feed signal representing one or more speakers in a playback environment. Compatible with playback speakers,
applying a high-pass filter to at least a portion of the plurality of speaker feed signals to generate a high-pass filtered speaker feed signal;
applying a low pass filter to the audio data of each of a plurality of audio objects to generate a low frequency (LF) audio object;
panning the LF audio object based at least in part on the LFC speaker position data to generate an LFC speaker feed signal;
outputting the LFC speaker feed signal to the two or more LFC speakers of the playback environment, and providing the high-pass filtered speaker feed signal to one or more main playback speakers of the playback environment;
have the
The method further comprises:
Decimating the audio data of one or more of the plurality of audio objects prior to or as part of applying the low pass filter to the audio data of each of the plurality of audio objects;
have a
How .

determining a signal level of the audio data of the audio object; comparing the signal level to a threshold signal level; 2. The method of claim 1 , further comprising applying the low pass filter.

calculating a power deficit based at least in part on gain and highpass filter characteristics;
determining the low pass filter based at least in part on the power deficit;
3. The method of any one of claims 1-2 , further comprising:

4. The method of any one of claims 1-3 , wherein applying a high-pass filter to at least some of the plurality of speaker feed signals comprises applying two or more different high-pass filters.

Applying a highpass filter to at least a portion of the plurality of speaker feed signals includes applying a first highpass filter to a first plurality of the speaker feed signals to create a first highpass filtered speaker feed. generating a signal; and applying a second highpass filter to a second plurality of said speaker feed signals to generate a second highpass filtered speaker feed signal; 5. A method according to any preceding claim, wherein a filter is arranged to pass a frequency range lower than said second high pass filter.

The method further comprises receiving first playback speaker performance information for the first set of main playback speakers and receiving second playback speaker performance information for the second set of main playback speakers;
The first high-pass filter corresponds to the first reproduction speaker performance information,
The second high-pass filter corresponds to the second playback speaker performance information,
Providing the high-pass filtered speaker feed signal to the one or more main playback speakers provides the first high-pass filtered speaker feed signal to the first set of main playback speakers, and provides the first high-pass filtered speaker feed signal to the first set of main playback speakers; providing two high-pass filtered speaker feed signals to the second set of main playback speakers;
6. The method of claim 5 .

7. The metadata of any one of claims 1 to 6 , wherein the metadata comprises an indication whether a high pass filter should be applied to speaker feed signals corresponding to a particular one of the plurality of audio objects. Method.

8. A method according to any preceding claim, wherein generating the LF audio object comprises applying two or more different filters.

Generating the LF audio object includes:
applying a low pass filter configured to pass a first frequency range to at least some of the plurality of audio objects to generate a first LF audio object; and applying a high-pass filter to the object configured to pass a second frequency range, which is the mid-LF frequency range, to generate a second LF audio object;
have the
panning the LF audio object based at least in part on the LFC speaker position data to generate an LFC speaker feed signal;
panning the first LF audio object to generate a first LFC speaker feed signal, and panning the second LF audio object to generate a second LFC speaker feed signal;
have a
9. A method according to any one of claims 1-8 .

Generating the LF audio object includes:
applying a low pass filter configured to pass a first frequency range to a first plurality of said audio objects to generate a first LF audio object; and to a second plurality of said audio objects. , applying a bandpass filter configured to pass a second frequency range, which is the mid-LF frequency range, to generate a second LF audio object;
have the
panning the LF audio object based at least in part on the LFC speaker position data to generate an LFC speaker feed signal;
panning the first LF audio object to generate a first LFC speaker feed signal, and panning the second LF audio object to generate a second LFC speaker feed signal;
have a
9. A method according to any one of claims 1-8 .

Receiving the LFC speaker position data comprises receiving non-subwoofer position data indicating the position of each of a plurality of non-subwoofer reproduction speakers capable of reproducing audio data within the second frequency range. and generating the second LFC speaker feed signal pans at least a portion of the second LF audio object based at least in part on the non-subwoofer position data to produce a non-subwoofer audio object. generating a subwoofer speaker feed signal, the method further comprising providing the non-subwoofer speaker feed signal to one or more of the plurality of non-subwoofer reproduction speakers of the reproduction environment. 11. A method according to claim 9 or 10 , comprising

Receiving the LFC speaker position data comprises receiving mid-subwoofer position data indicating a position of each of a plurality of mid-subwoofer reproduction speakers capable of reproducing audio data within the second frequency range. and generating the second LFC speaker feed signal based at least in part on the mid subwoofer position data for panning at least a portion of the second LF audio object to produce a mid generating a subwoofer speaker feed signal, the method further comprising providing the mid-subwoofer speaker feed signal to one or more of the plurality of mid-subwoofer reproduction speakers of the reproduction environment. 11. A method according to claim 9 or 10 , comprising

13. A method according to any preceding claim, wherein said playback speaker layout data comprises an indication of positions of one or more groups of playback speakers within said playback environment.

14. Apparatus comprising a control system and an interface system configured to perform the method of any one of claims 1-13 .

14. One or more non-transitory media storing software, said software for controlling one or more devices to perform the method of any one of claims 1 to 13 . A non-transitory medium that contains instructions.