Time slot position coding of multiple frame types

• US 7,822,616 B2
• Filed: 08/30/2006
• Issued: 10/26/2010
• Est. Priority Date: 08/30/2005
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Pang, Hee Suk, Oh, Hyen O., Lim, Jae Hyun, Jung, Yang Won, Kim, Dong Soo
• Primary Examiner(s): Hudspeth; David R
• Assistant Examiner(s): GODBOLD, DOUGLAS
• Application Number:
  US11/513,834
• Publication Number:
  US 20070203697A1
• Time in Patent Office: 1,518 Days
• Field of Search: 704/200, 704/200.1, 704/201, 704/500, 704/501, 381/23
• US Class Current: 704/500
• CPC Class Codes: G10L 19/008 Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
• CPC Class Codes: G10L 19/167 Audio streaming, i.e. formatting and decoding of an encoded audio signal representation into a data stream for transmission or storage purposes
• CPC Class Codes: H04R 2499/11 Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
• CPC Class Codes: H04S 1/007 in which the audio signals are in digital form data reduction aspects thereof based on psychoacoustics G10L19/02
• CPC Class Codes: H04S 2420/03 Application of parametric coding in stereophonic audio systems
• CPC Class Codes: H04S 3/002 Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution control circuits for electronic adaptation of the sound field H04S7/30

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.

Claims

1. A method of decoding an audio signal performed by an audio player, 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 a frame type of the audio signal, the frame type indicating whether an interval of a time slot to which a corresponding parameter set is applied is equidistant or variable distant,

wherein when the frame type indicates that the interval of the time slot is variable distant, comprising

extracting a number of time slots and a number of parameter sets from the audio signal to identify time slot information, the time slot information indicating a time slot to which a parameter set is applied;

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 the time slot information is equal to the number of parameter sets; and

converting the audio signal into a multi-channel audio signal based on the time slot information and the parameter set, and

wherein the time slot information includes an absolute value indicating a time slot to which a first parameter set is applied or a difference value indicating a time slot to which a following parameter set of the first parameter set is applied,

wherein the time slot to which the following parameter set is applied is determined by adding the difference value to previous time slot information associated with a previous parameter set;

controlling information regarding the multi-channel audio signal to an audio subsystem for converting the multi-channel audio signal;

transmitting the multi-channel audio signal or the audio signal to external unit;

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.

2. The method of claim 1, wherein the time slot information is position information indicating a position of time slot to which a parameter set is applied.

3. An audio player, comprising:

a processor configured to generate a multi-channel audio signal from an audio signal, 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 a frame type of the audio signal, the frame type indicating whether an interval of a time slot to which a corresponding parameter set is applied is equidistant or variable distant, wherein when the frame type indicates that the interval of the time slot is variable distant, comprising;

extracting a number of time slots and a number of parameter sets from the frame of the spatial information to identify time slot information, the time slot information indicating a time slot to which a parameter set is applied;

determining a bit length of the time slot information according to the number of time slots and the number of parameter sets, and previous time slot information associated with a previous parameter set, the bit length being variable; and

extracting the time slot information based on the bit length,

wherein a number of the time slot information is equal to the number of parameter sets;

converting the audio signal into a multi-channel audio signal, based on the time slot information and the parameter set,

wherein the time slot information includes an absolute value indicating a time slot to which a first parameter set is applied or a difference value indicating a time slot to which a following parameter set of the first parameter set is applied,

wherein the time slot to which the following parameter set is applied is determined by adding the difference value to previous time slot information associated with a previous parameter set;

an operating system configured to control information regarding the multi-channel audio signal to an audio subsystem for converting the multi-channel audio signal;

a network interface configured to transmit the multi-channel audio signal or the audio signal to 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.

4. The apparatus of claim 3, wherein the time slot information is position information indicating a position of time slot to which a parameter set is applied.

10. The audio player of claim 3, wherein at least two of the processor, the operating system, the network interface, the audio subsystem, and the speaker exchange data via one or more buses.

5. A broadcast playback system, comprising:

a receiver configured to receive a broadcast signal including an audio signal generated by downmixing a multi-channel audio signal;

an application unit configured to store an audio codec for decoding;

a processor configured to generate the multi-channel audio signal from the audio signal, 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 a frame type of the audio signal, the frame type indicating whether an interval of a time slot to which a corresponding parameter set is applied is equidistant or variable distant,

wherein when the frame type indicates that the interval of time slot is a variable distant, comprising;

extracting a number of time slots and a number of parameter sets from the frame of the spatial information to identify time slot information, the time slot information indicating a time slot to which a parameter set is applied;

determining a bit length of the time slot information according to the number of time slots and the number of parameter sets and previous time slot information associated with a previous parameter set, the bit length being variable; and

extracting the time slot information based on the bit length, wherein a number of the time slot information is equal to the number of parameter sets;

converting the audio signal into the multi-channel audio signal based on the time slot information and the parameter set,

wherein the time slot information includes an absolute value indicating a time slot to which a first parameter set is applied or a difference value indicating a time slot to which a following parameter set of the first parameter set is applied,

wherein the time slot to which the following parameter set is applied is determined by adding the difference value to previous time slot information associated with a previous parameter set;

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 multi- channel analog output signal; and

a speaker configured to output at least one channel of the multi-channel analog output signal.

6. The broadcast playback system of claim 5, wherein at least two of the receiver, the application unit, the processor, the display unit, the audio subsystem, and the speaker exchange data via one or more buses.

7. The broadcast playback system of claim 5, wherein the time slot information is position information indicating a position of time slot to which a parameter set is applied.

8. A method of decoding an audio signal performed by a broadcast playback system, the decoding based on audio codec for decoding stored in the broadcast playback 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 a frame type of the audio signal, the frame type indicating whether an interval of a time slot to which a corresponding parameter set is applied is equidistant or variable distant,

wherein when the frame type indicates that the interval of the time slot is variable distant, comprising;

extracting a number of time slots and a number of parameter sets from the audio signal to identify time slot information, the time slot information indicating a time slot to which a parameter set is applied;

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 the time slot information is equal to the number of parameter sets; and

converting the audio signal into the multi-channel audio signal based on the time slot information and the parameter set;

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.

9. The method of claim 8, wherein the time slot information is position information indicating a position of the time slot to which a parameter set is applied.