Switching between transforms

Apparatus for processing audio or video data, the apparatus comprising:

• an input for receiving time-domain audio or video data;
• a first transform module configured to generate first transform-domain audio or video data by at least applying a first transform to the time-domain audio or video data;
• a first signal processing module configured to generate first processed transform-domain audio or video data by at least applying first signal processing to the first transform-domain audio or video data;
• a conversion module configured to convert the first transform-domain audio or video data directly into second transform-domain audio or video data, the second transform-domain audio or video data being equivalent to data generated by applying a second transform to the audio or video data, the second transform being different from the first transform;
• a second signal processing module connected to the conversion module and configured to generate processed second transform-domain audio or video data by at least applying second signal processing to the second transform-domain audio or video data;
• an analysis module configured to analyze at least one of the time-domain audio or video data, the first transform-domain audio or video data, the processed first transform-domain audio or video data, the second transform-domain audio or video data or the processed second transform-domain audio or video data, and to determine at least in part therefrom whether to apply the first signal processing or the second signal processing, wherein the analysis module determines whether to apply the first signal processing or the second signal processing based on at least one of a latency criterion, a complexity criterion, and a band separation criterion;
• and
• a path selection module configured to,
• in response to the analysis module determining to apply the first signal processing, selectively channel the time-domain audio or video data along a first path from the first transform module through the first signal processing module, thereby producing the first processed transform-domain audio or video data, and send the first processed transform-domain audio or video data to a third signal processing module without applying any further transform, and
• in response to the analysis module determining to apply the second signal processing, selectively channel the time-domain audio or video data along a second path from the first transform module through the conversion module and the second signal processing module, thereby producing the processed second transform-domain audio or video data, and send the processed second transform-domain audio or video data to the third signal processing module without applying any further transform.

Apparatus for processing audio or video data, the apparatus comprising:

• an input for receiving first transform-domain audio or video data;
• a first signal processing module configured to generate processed first transform-domain audio or video data by at least applying first signal processing to the first transform-domain audio or video data;
• a first inverse transform module selectively connected to the first signal processing module and configured to generate audio or video data by at least applying a first inverse transform to the processed first transform-domain audio or video data, the first inverse transform being the inverse of a first transform;
• a first transform module connected to the first inverse transform module and configured to generate second transform-domain audio or video data by at least applying a second transform to the audio or video data, the second transform being different from the first transform;
• a second signal processing module connected to the first transform module and configured to generate processed second transform-domain audio or video data by at least applying second signal processing to the second transform-domain audio or video data;
• a third signal processing module selectively connected to the first signal processing module and configured to generate twice processed first transform-domain audio or video data by at least applying third signal processing to the processed first transform-domain audio or video data;
• an analysis module configured to analyze at least one of the first transform-domain audio or video data, the processed first transform-domain audio or video data, the audio or video data, the second transform-domain audio or video data or the processed second transform-domain audio or video data, and to determine at least in part therefrom whether to apply the second signal processing or the third signal processing;
• and
• a path selection module configured to,
• in response to the analysis module determining to apply the second signal processing, selectively channel the first transform-domain audio or video data along a first path from the input to the second signal processing module, thereby producing the processed first transform-domain audio or video data, and send the processed first transform-domain audio or video data to the first inverse transform module or a further inverse transform module configured to generate audio or video data by at least applying a first inverse transform to the first transform-domain audio or video data, and
• in response to the analysis module determining to apply the third signal processing, selectively channel the first transform-domain audio or video data along a second path from the input to the first signal processing module, thereby producing the processed first transform-domain audio or video data, and send the processed first transform-domain audio or video data to the third signal processing module.

Apparatus for processing audio or video data, the apparatus comprising:

• an input for receiving first transform-domain audio or video data;
• a first signal processing module configured to generate processed first transform-domain audio or video data by at least applying first signal processing to the first transform-domain audio or video data;
• a conversion module configured to convert the first transform-domain audio or video data directly into second transform-domain audio or video data;
• a second signal processing module connected to the conversion module and configured to generate processed second transform-domain audio or video data by at least applying second signal processing to the second transform-domain audio or video data;
• an analysis module configured to analyze at least one of the first transform-domain audio or video data, the processed first transform-domain audio or video data, the second transform-domain audio or video data or the processed second transform-domain audio or video data, and to determine at least in part therefrom whether to apply the first signal processing or the second signal processing;
• and
• a path selection module configured to,
• in response to the analysis module determining to apply the first signal processing, selectively channel the first transform-domain audio or video data along a first path from the input to the first signal processing module, thereby producing the processed first transform-domain audio or video data, and send the processed first transform-domain audio or video data to an inverse transform module configured to generate audio or video data by at least applying a first inverse transform to the first transform-domain audio or video data, and
• in response to the analysis module determining to apply the second signal processing, selectively channel the first transform-domain audio or video data along a second path from the input to the conversion module and the second signal processing module, thereby producing the processed second transform-domain audio or video data.