Slot position coding of OTT syntax of spatial audio coding application
First Claim
1. A method of decoding an audio signal performed by a broadcast playback system, 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 that a dual mode is selected, the dual mode indicating two modes for a low band range and a high band range;
extracting mode information for the low band range and the 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
converting the audio signal into a multi-channel 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;
displaying information regarding the multi-channel audio signal;
transmitting the multi-channel audio signal or the audio signal to an external unit;
converting the multi-channel audio signal into multi-channel analog output signal; and
outputting at least one channel of the multi-channel analog output signal.
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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
19 Claims
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1. A method of decoding an audio signal performed by a broadcast playback system, 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 that a dual mode is selected, the dual mode indicating two modes for a low band range and a high band range; extracting mode information for the low band range and the 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 converting the audio signal into a multi-channel 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; displaying information regarding the multi-channel audio signal; transmitting the multi-channel audio signal or the audio signal to an external unit; converting the multi-channel audio signal into multi-channel analog output signal; and outputting at least one channel of the multi-channel analog output signal. - View Dependent Claims (2, 3, 4)
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5. A broadcast playback system, comprising:
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a receiver configured to receive a broadcast signal including an audio signal generated by downmixing a multi-channel audio signal; a processor configured to generate the multi-channel audio signal from the audio signal, comprising the steps of; receiving the 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 that a dual mode is selected, the dual mode indicating two modes for a low band range and a high band range; extracting mode information for the low band range and the 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 converting the audio signal into a multi-channel 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; a display unit configured to display information regarding the multi-channel audio signal; a network interface configured to transmit the multi-channel audio signal or the audio signal to an external unit; an audio subsystem configured to convert the multi-channel audio signal into a multi-channel analog output signal; and a speaker configured to output at least one channel of the multi-channel analog output signal. - View Dependent Claims (6, 7, 8, 9)
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10. A music player, comprising:
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a network communication unit configured to search audio related information, when a network connection is established; a processor configured to generate a multi-channel audio signal from an audio signal, comprising the steps of; receiving the 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 that a dual mode is selected, the dual mode indicating 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 converting the audio signal into a multi-channel audio signal by applying the parameter to the downmix signal based on the sime 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; a display unit configured to display information regarding the multi-channel audio signal; an audio subsystem configured to convert the multi-channel audio signal into a multi-channel analog output signal; and a speaker configured to output at least one channel of the multi-channel analog output signal. - View Dependent Claims (11, 12, 13, 14)
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15. A method of decoding an audio signal performed by a music player, 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 that a dual mode is selected, the dual mode indicating 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 converting the audio signal into the multi-channel 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; displaying information regarding the multi-channel audio signal; converting the multi-channel audio signal into a multi-channel analog output signal; and outputting at least one channel of the multi-channel analog output signal. - View Dependent Claims (16, 17, 18, 19)
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Specification