Transcoding of audio metadata

A method for transcoding audio gain metadata related to dynamic range control from first gain metadata of a first audio coding scheme to second gain metadata of a second audio coding scheme, wherein

• the first and second audio coding schemes have different numbers of audio samples per coding block;
• each coding block has at least one associated gain value;
• and
• a series of gain values of adjacent coding blocks is interpolated to define a gain curve;
• and
• wherein the method comprises the step of:
• selecting the gain values of the second gain metadata based on gain values of the first gain metadata such that the second gain curve is below the first gain curve.

A method for transcoding audio gain metadata related to dynamic range control from first gain metadata of a first audio coding scheme to second gain metadata of a second audio coding scheme, wherein

• the first and second audio coding schemes use coding blocks wherein the coding blocks of the first and second audio coding schemes cover different lengths of time of an encoded audio signal;
• each coding block has at least one associated gain value;
• and
• a second gain curve is associated with the gain values of the second gain metadata;
• and
• wherein the method comprises the step of:
• selecting the gain values of the second gain metadata such that, at time instances associated with the coding blocks of the first audio coding scheme, the second gain curve is smaller or equal to the gain values of the first gain metadata.

A transcoding system for transcoding audio gain metadata related to dynamic range control from first gain metadata of a first audio coding scheme to second gain metadata of a second audio coding scheme, wherein

• the first and second audio coding schemes use coding blocks wherein the coding blocks of the first and second audio coding schemes cover different lengths of time of an encoded audio signal;
• and
• each coding block has at least one associated gain value;
• and
• wherein the transcoding system is configured to select a gain value of the second gain metadata based on the gain values of the first gain metadata such that within a time interval around the time instance associated with the gain value of the second gain metadata, the minimum gain value of the first gain metadata is selected.

A transcoding system for transcoding audio gain metadata related to dynamic range control from first gain metadata of a first audio coding scheme to second gain metadata of a second audio coding scheme, wherein

• the first and second audio coding schemes have different numbers of audio samples per coding block;
• each coding block has an associated gain value;
• and
• a series of gain values of adjacent coding blocks is interpolated to define a gain curve;
• and
• wherein the transcoding system is configured to select the gain values of the second gain metadata based on gain values of the first gain metadata such that the second gain curve is below the first gain curve.

A transcoding system for transcoding audio gain metadata related to dynamic range control from first gain metadata of a first audio coding scheme to second gain metadata of a second audio coding scheme, wherein

• the first and second audio coding schemes use coding blocks wherein the coding blocks of the first and second audio coding schemes cover different lengths of time of an encoded audio signal;
• each coding block has an associated gain value;
• and
• a second gain curve is associated with the gain values of the second gain metadata;
• and
• wherein the transcoding system is configured to select the gain values of the second gain metadata such that, at time instances associated with the coding blocks of the first audio coding scheme, the second gain curve is smaller or equal to the gain values of the first gain metadata.

A computer program product comprising:

• a tangible non-transitory computer-readable storage medium;
• and
• executable instructions stored within the storage medium that when executed by a processor are operable to:
• transcode audio gain metadata related to dynamic range control from first gain metadata of a first audio coding scheme to second gain metadata of a second audio coding scheme;
• wherein:
• the first and second audio coding schemes use coding blocks wherein the coding blocks of the first and second audio coding schemes cover different lengths of time of an encoded audio signal;
• each coding block has at least one associated gain value;
• and
• to transcode the audio gain metadata, the instructions include instructions to select a gain value of the second gain metadata based on gain values of the first gain metadata such that, within a time interval around the time instance associated with the gain value of the second gain metadata, the minimum gain value of the first gain metadata is selected.

A computer program product comprising:

• a tangible non-transitory computer-readable storage medium;
• and
• executable instructions stored within the storage medium that when executed by a processor are operable to:
• transcode audio gain metadata related to dynamic range control from first gain metadata of a first audio coding scheme to second gain metadata of a second audio coding scheme;
• wherein:
• the first and second audio coding schemes have different numbers of audio samples per coding block;
• each coding block has at least one associated gain value;
• a series of gain values of adjacent coding blocks is interpolated to define a gain curve;
• and
• to transcode the audio gain metadata, the instructions include instructions to select the gain values of the second gain metadata based on gain values of the first gain metadata such that the second gain curve is below the first gain curve.

A computer program product comprising:

• a tangible non-transitory computer-readable storage medium;
• and
• executable instructions stored within the storage medium that when executed by a processor are operable to:
• transcode audio gain metadata related to dynamic range control from first gain metadata of a first audio coding scheme to second gain metadata of a second audio coding scheme;
• wherein:
• the first and second audio coding schemes use coding blocks wherein the coding blocks of the first and second audio coding schemes cover different lengths of time of an encoded audio signal;
• each coding block has at least one associated gain value;
• and
• a second gain curve is associated with the gain values of the second gain metadata;
• and
• to transcode the audio gain metadata, the instructions include instructions to select the gain values of the second gain metadata such that, at time instances associated with the coding blocks of the first audio coding scheme, the second gain curve is smaller or equal to the gain values of the first gain metadata.

A set-top box for decoding a received multimedia signal, the set-top box comprising:

• a receiver for receiving a multimedia signal in a first coding scheme;
• a transcoding unit for transcoding the multimedia signal in the first coding scheme into a multimedia signal in a second coding scheme;
• and
• a transmitter for transmitting the transcoded multimedia signal;
• wherein the transcoding unit transcodes audio gain metadata related to dynamic range control from first gain metadata of the first coding scheme to second gain metadata of the second coding scheme, wherein
• the first and second audio coding schemes use coding blocks wherein the coding blocks of the first and second audio coding schemes cover different lengths of time of an encoded audio signal;
• and
• each coding block has at least one associated gain value;
• and
• wherein the transcoding unit selects a gain value of the second gain metadata based on the gain values of the first gain metadata such that within a time interval around the time instance associated with the gain value of the second gain metadata, the minimum gain value of the first gain metadata is selected.

A set-top box for decoding a received multimedia signal, the set-top box comprising:

• a receiver for receiving a multimedia signal in a first coding scheme;
• a transcoding unit for transcoding the multimedia signal in the first coding scheme into a multimedia signal in a second coding scheme;
• and
• a transmitter for transmitting the transcoded multimedia signal;
• wherein the transcoding unit transcodes audio gain metadata related to dynamic range control from first gain metadata of the first coding scheme to second gain metadata of the second coding scheme, wherein
• the first and second audio coding schemes have different numbers of audio samples per coding block;
• each coding block has an associated gain value;
• and
• a series of gain values of adjacent coding blocks is interpolated to define a gain curve;
• and
• wherein the transcoding unit selects the gain values of the second gain metadata based on gain values of the first gain metadata such that the second gain curve is below the first gain curve.

A set-top box for decoding a received multimedia signal, the set-top box comprising:

• a receiver for receiving a multimedia signal in a first coding scheme;
• a transcoding unit for transcoding the multimedia signal in the first coding scheme into a multimedia signal in a second coding scheme;
• and
• a transmitter for transmitting the transcoded multimedia signal;
• wherein the transcoding unit transcodes audio gain metadata related to dynamic range control from first gain metadata of the first coding scheme to second gain metadata of the second coding scheme, wherein
• the first and second audio coding schemes use coding blocks wherein the coding blocks of the first and second audio coding schemes cover different lengths of time of an encoded audio signal;
• each coding block has an associated gain value;
• and
• a second gain curve is associated with the gain values of the second gain metadata;
• and
• wherein the transcoding system selects the gain values of the second gain metadata such that, at time instances associated with the coding blocks of the first audio coding scheme, the second gain curve is smaller or equal to the gain values of the first gain metadata.