SLOT POSITION CODING OF TTT SYNTAX OF SPATIAL AUDIO CODING APPLICATION
First Claim
1. A media player, comprising:
- a network communication unit configured to search audio related information, when a network is established;
an application unit configured to store an audio codec for decoding an audio signal;
a processor configured to perform operations of generating a multi-channel audio signal from the audio signal, the operations comprising;
receiving the 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
converting the audio signal into the 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 extracting the 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 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;
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.
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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.
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Citations
19 Claims
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1. A media player, comprising:
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a network communication unit configured to search audio related information, when a network is established; an application unit configured to store an audio codec for decoding an audio signal; a processor configured to perform operations of generating a multi-channel audio signal from the audio signal, the operations comprising; receiving the 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 converting the audio signal into the 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 extracting the 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 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; 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 (2, 3, 4, 5)
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6. A broadcast playback system, comprising:
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a receiver configured to receive broadcast signal including an audio signal generated by downmixing a multi-channel audio signal; a processor configured to perform operations of generating the multi-channel audio signal from the audio signal, the operations 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 converting the audio signal into the multi-channel audio signal, the converting including 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 extracting the 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 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; an operating system configured to control information regarding the multi-channel audio signal to an audio subsystem; 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 (7, 8, 9, 10)
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11. A method of decoding an audio signal performed by a media player, the decoding based on audio codec for decoding stored in the media player, the method 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; converting the audio signal into 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 extracting the 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 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; 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 (12, 13, 14, 15)
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16. A method of decoding an audio signal performed by a broadcast playback system, the method 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 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; converting the audio signal into a multi-channel audio signal, the converting including 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 extracting the 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 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; controlling information regarding the multi-channel audio signal to an audio subsystem for converting the multi-channel audio signal; 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 (17, 18, 19)
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Specification