SLOT POSITION CODING OF OTT SYNTAX OF SPATIAL AUDIO CODING APPLICATION
First Claim
1. A method of decoding an audio signal, comprising:
- receiving an audio signal including a downmix signal and spatial information, the spatial information including at least one frame having at least one time slot and at least one parameter set, the parameter set including at least one parameter;
extracting time slot information in variable bit length, the time slot information indicating a time slot to which a parameter set is applied;
determining whether a dual mode is selected, the dual mode indicating that two modes for a low band range and a high band range;
extracting mode information for each a low band range and a high band range, the mode information determining a type of parameter being used for the low band range or the high band range;
extracting dual mode parameter band information indicating a number of parameter bands for the low band range; and
decoding the audio signal by applying the parameter to the downmix signal based on the time slot information and the dual mode parameter band information,wherein the process of extracting time slot information comprises;
extracting a number of time slots and a number of parameter sets from the audio signal to identify time slot information,determining a bit length of the time slot information, the bit length being variable according to the number of time slots, the number of parameter sets and previous time slot information associated with a previous parameter set, andextracting the time slot information based on the bit length,wherein the extracted 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 either a fixed number of bits or a variable number of bits based on the data structure type.
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Citations
8 Claims
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1. A method of decoding an audio signal, comprising:
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receiving an audio signal including a downmix signal and spatial information, the spatial information including at least one frame having at least one time slot and at least one parameter set, the parameter set including at least one parameter; extracting time slot information in variable bit length, the time slot information indicating a time slot to which a parameter set is applied; determining whether a dual mode is selected, the dual mode indicating that two modes for a low band range and a high band range; extracting mode information for each a low band range and a high band range, the mode information determining a type of parameter being used for the low band range or the high band range; extracting dual mode parameter band information indicating a number of parameter bands for the low band range; and decoding the audio signal by applying the parameter to the downmix signal based on the time slot information and the dual mode parameter band information, wherein the process of extracting time slot information comprises; extracting a number of time slots and a number of parameter sets from the audio signal to identify time slot information, determining a bit length of the time slot information, the bit length being variable according to the number of time slots, the number of parameter sets and previous time slot information associated with a previous parameter set, and extracting the time slot information based on the bit length, wherein the extracted number of time slot information is equal to the number of parameter sets. - View Dependent Claims (2, 3, 4)
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5. An apparatus for decoding an audio signal, including a downmix signal and spatial information, the spatial information including at least one frame having at least one time slot and at least one parameter set, comprising:
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an interface for receiving the audio signal; and a processor comprising a demultiplexer, a spatial information decoding unit, a downmix signal decoding unit and an upmixing unit, wherein the demultiplexer separates the downmix signal and spatial information from a bitstream of the audio signal, and wherein the downmix signal decoding unit decodes the downmix signal, and wherein the spatial information decoding unit extracts a number of time slots and a number of parameter sets from the audio signal to identify time slot information indicating a time slot to which a parameter set is applied, and determines a bit length of the time slot information, the bit length being variable according to the number of time slots, the number of parameter sets and previous time slot information associated with a previous parameter set, and extracts the time slot information based on the bit length, and determines whether a dual mode is selected, the dual mode indicating two modes for a low band range and a high band range, and extracts the dual mode for each a low band range and a high band range, the dual mode determining a type of parameter being used for the low band range or the high band range, and extracts dual mode parameter band information indicating a number of parameter bands for the low band range, and wherein the extracted number of time slot information is equal to the number of parameter sets, and wherein the upmixing unit decodes the audio signal by applying the parameter to the downmix signal based on the time slot information and the dual mode parameter band information. - View Dependent Claims (6, 7, 8)
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Specification