Slot position coding of TTT syntax of spatial audio coding application
First Claim
1. A method of decoding an audio signal performed by an audio coding system, comprising:
- receiving an audio signal including at least one frame, the frame comprising at least one time slot and at least one parameter set;
determining whether a Low Frequency Enhancement (LFE) mode is selected, the LFE mode being different from a normal mode for an LFE channel;
extracting time slot information in variable bit length, the time slot information indicating a time slot to which a parameter set is applied;
extracting LFE parameter band information in fixed bit length, the LFE parameter band information indicating a number of parameter bands for the LFE channel; and
decoding the audio signal by applying the parameter of the parameter set to a parameter band of the time slot, based on the LFE parameter band information and the time slot information,wherein the process of extracting the time slot information comprises;
extracting a number of time slots and a number of parameter sets from the audio signal to identify the time slot information;
determining a bit length of the time slot information, the bit length being variable according to the number of time slots and the number of parameter sets; and
extracting the time slot information based on the bit length,wherein a number of time slot information is equal to the number of parameter sets.
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Abstract
Spatial information associated with an audio signal is encoded into a bitstream, which can be transmitted to a decoder or recorded to a storage media. The bitstream can include different syntax related to time, frequency and spatial domains. In some embodiments, the bitstream includes one or more data structures (e.g., frames) that contain ordered sets of slots for which parameters can be applied. The data structures can be fixed or variable. The data structure can include position information that can be used by a decoder to identify the correct slot for which a given parameter set is applied. The slot position information can be encoded with a fixed number of bits or a variable number of bits based on the data structure type.
106 Citations
10 Claims
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1. A method of decoding an audio signal performed by an audio coding system, comprising:
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receiving an audio signal including at least one frame, the frame comprising at least one time slot and at least one parameter set; determining whether a Low Frequency Enhancement (LFE) mode is selected, the LFE mode being different from a normal mode for an LFE channel; extracting time slot information in variable bit length, the time slot information indicating a time slot to which a parameter set is applied; extracting LFE parameter band information in fixed bit length, the LFE parameter band information indicating a number of parameter bands for the LFE channel; and decoding the audio signal by applying the parameter of the parameter set to a parameter band of the time slot, based on the LFE parameter band information and the time slot information, wherein the process of extracting the time slot information comprises; extracting a number of time slots and a number of parameter sets from the audio signal to identify the time slot information; determining a bit length of the time slot information, the bit length being variable according to the number of time slots and the number of parameter sets; and extracting the time slot information based on the bit length, wherein a number of time slot information is equal to the number of parameter sets. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus of decoding an audio signal, including a downmix signal and spatial information, the spatial information including at least one frame, the frame comprising at least one time slot and at least one parameter set, comprising:
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a spatial information decoding unit configured to determine whether a Low Frequency Enhancement (LFE) mode is selected, the LFE mode being different from a normal mode for an LFE channel, to extract LFE parameter band information in fixed bit length, the LFE parameter band information indicating a number of parameter bands for the LFE channel, and to extract a number of time slots and a number of parameter sets from the audio signal to identify time slot information, and to determine a bit length of the time slot information, the bit length being variable according to the number of time slots and the number of parameter sets, and to extract the time slot information in variable bit length based on the bit length, wherein a number of time slot information is equal to the number of parameter sets; a downmix signal decoding unit configured to decode the downmix signal; and a multi channel generating unit configured to generate a multi-channel audio signal by applying the parameter of the parameter set to a parameter band of the time slot, based on the LFE parameter band information and the time slot information, wherein at least one of the spatial information decoding unit, the downmix signal decoding unit, and the multi channel generating unit includes a processor. - View Dependent Claims (7, 8, 9, 10)
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Specification