Low coding rate parametric spatial audio encoding
OwnerAdriana VASILACHEinventor
Life of this patent
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Abstract
An apparatus configured to: receive a direction value for a time frame of an audio object; compare, as a first comparison, a bit allocation against a threshold bit allocation value; depending on the first comparison, either quantize the direction value for the time frame of the audio object with a quantizer according to the bit allocation, or compare, as a second comparison, the direction value for the time frame of the audio object with a direction value for a previous time frame of the audio object; and depending on the second comparison quantize the direction value for the time frame with the quantizer according to the bit allocation and signal the second comparison.
Claims37
An apparatus comprising at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to:
- receive a direction value for a time frame of an audio object;
- compare, as a first comparison, a bit allocation against a threshold bit allocation value;
- depending on the first comparison, either quantize the direction value for the time frame of the audio object with a quantizer according to the bit allocation, or compare, as a second comparison, the direction value for the time frame of the audio object with a direction value for a previous time frame of the audio object;
- and
- depending on the second comparison quantize the direction value for the time frame with the quantizer according to the bit allocation and signal the second comparison.
An apparatus comprising at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to:
- compare a bit allocation for a direction value index for a time frame of an audio object against a threshold bit allocation value;
- depending on the comparison, either decode the direction value index for the time frame of the audio object with a de-quantizer according to the bit allocation, or read a state of a signal flag associated with the direction value index for the time frame of the audio object;
- and
- depending on the state of the signal flag;
- either set a quantized direction value for the time frame of the audio object to be a quantized direction value for a previous time frame of the audio object, or
- decode the direction value index for the time frame of the audio object with a de-quantizer according to the bit allocation giving a quantized direction value for the time frame of the audio object and adjust an azimuth value of the quantized direction value for the time frame of the audio object in accordance with a quantization resolution of the azimuth value.
A method comprising:
- receiving a direction value for a time frame of an audio object;
- comparing, as a first comparison, a bit allocation against a threshold bit allocation value;
- depending on the first comparison, either quantizing the direction value for the time frame of the audio object with a quantizer according to the bit allocation, or comparing, as a second comparison, the direction value for the time frame of the audio object with a direction value for a previous time frame of the audio object;
- and
- depending on the second comparison quantizing the direction value for the time frame with the quantizer according to the bit allocation and signaling the second comparison.
A method comprising:
- comparing a bit allocation for a direction value index for a time frame of an audio object against a threshold bit allocation value;
- depending on the comparison, either decoding the direction value index for the time frame of the audio object with a de-quantizer according to the bit allocation, or reading a state of a signal flag associated with the direction value index for the time frame of the audio object;
- and depending on the state of the signal flag;
- either setting a quantized direction value for the time frame of the audio object to be a quantized direction value for a previous time frame of the audio object, or
- decoding the direction value index for the time frame of the audio object with a de-quantizer according to the bit allocation giving a quantized direction value for the time frame of the audio object and adjusting an azimuth value of the quantized direction value for the time frame of the audio object in accordance with a quantization resolution of the azimuth value.
Dependencies are inferred from the claim text.