CA2620627A1 - Apparatus for encoding and decoding audio signal and method thereof - Google Patents

Apparatus for encoding and decoding audio signal and method thereof Download PDF

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Publication number
CA2620627A1
CA2620627A1 CA002620627A CA2620627A CA2620627A1 CA 2620627 A1 CA2620627 A1 CA 2620627A1 CA 002620627 A CA002620627 A CA 002620627A CA 2620627 A CA2620627 A CA 2620627A CA 2620627 A1 CA2620627 A1 CA 2620627A1
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Canada
Prior art keywords
position information
time slots
bitstream
parameter sets
time slot
Prior art date
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Granted
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CA002620627A
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French (fr)
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CA2620627C (en
Inventor
Hee Suk Pang
Hyeon O Oh
Dong Soo Kim
Jae Hyun Lim
Yang Won Jung
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LG Electronics Inc
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Individual
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Priority claimed from KR1020060004057A external-priority patent/KR20070025904A/en
Priority claimed from KR1020060004062A external-priority patent/KR20070037974A/en
Priority claimed from KR1020060004063A external-priority patent/KR20070025907A/en
Application filed by Individual filed Critical Individual
Publication of CA2620627A1 publication Critical patent/CA2620627A1/en
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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
    • G10L19/16—Vocoder architecture
    • G10L19/167—Audio streaming, i.e. formatting and decoding of an encoded audio signal representation into a data stream for transmission or storage purposes
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/008—Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S1/00—Two-channel systems
    • H04S1/007—Two-channel systems in which the audio signals are in digital form
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/11—Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S2420/00—Techniques used stereophonic systems covered by H04S but not provided for in its groups
    • H04S2420/03—Application of parametric coding in stereophonic audio systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S3/00—Systems employing more than two channels, e.g. quadraphonic
    • H04S3/002—Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution

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. A
data structure type indicator can be inserted in the bitstream to enable a decoder to determine the data structure type and to invoke an appropriate decoding process. 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 as indicated by the data structure type indicator. For variable data structure types, the slot position information can be encoded with a variable number of bits based on the position of the slot in the ordered set of slots.

Claims (20)

1. ~A method of encoding an audio signal, the method comprising:

determining a number of time slots and a number of parameter sets, the parameter sets including one or more parameters;

generating information indicating a position of at least one time slot in an ordered set of time slots to which a parameter set is applied;

encoding the audio signal as a bitstream including a frame, the frame including the ordered set of time slots; and inserting a variable number of bits in the bitstream that represent the position of the time slot in the ordered set of time slots, wherein the variable number of bits is determined by the time slot position.
2. ~A method of decoding an audio signal, comprising;
receiving a bitstream representing an audio signal, the bitstream having a frame;

determining a number of time slots and a number of parameter sets from the bitstream, the parameter sets including one or more parameters;

determining position information from the bitstream, the position information indicating a position of a time slot in an ordered set of time slots to which the parameter set is applied, where the ordered set of time slots is included in the frame;
and decoding the audio signal based on the number of time slots, the number of parameter sets and the position information, wherein the position information is represented by a variable number of bits based on the time slot position.
3. ~The method of claim 2, wherein the variable number of bits is determined using the number of time slots.
4. ~The method of claim 2, further comprising:

if the number time slots to be decoded is equal to a number of parameter sets to be applied, not determining the position information of the time slot to which a parameter set is applied.
5. The method of claim 4, wherein if the number of the time slots is equal to or greater than 2~(n-1) and less than 2~(n), the variable number of bits is determined as n bits.
6. The method of claim 4, wherein if the number of the time slots is greater than 2~(n-1) and equal to or less than 2~(n), the variable number of bits is determined as n bits.
7. The method of claim 3, wherein the position information is represented as the sum of a previous value and a difference value, wherein the previous value indicates the position information of the time slot to which a first parameter set is applied and the difference value indicates the position information of the time slot to which a second parameter set is applied.
8. The method of claim 7, wherein the previous value is represented by a variable number of bits determined using at least one of the number of time slots and the number of parameter sets.
9. The method of claim 8, wherein the variable number of bits is determined using a difference between the number of time slots and the number of parameter sets.
10. The method of claim 7, wherein the difference value is represented by a variable number of bits determined using at least one of the number of time slots, the number of parameter sets and a position information of the time slot to which a previous parameter set is applied.
11. The method of claim 10, wherein the variable number of bits is determined using a difference between the number of time slots and at least one of the number of parameter sets and the position information of the time slot to which the previous parameter set is applied.
12. The method of claim 3, wherein if the number of parameter sets is N, the position information of the time slot to which the parameter set is applied, is represented as a combination using a formula as follows:

~numSIots i-1 .cndot.bsParamSIot i, , 0<=bsPararmSlot i < numSlots, wherein numSlot and bsParamSlot i indicate the number of time slots and the position information of the time slot to which an i th parameter set is applied, respectively.
13. The method of claim 3, wherein if a plurality of the parameter sets exist, a plurality of the parameter sets are divided as a group and the position information of the time slot to which the parameter set is applied, is represented per the group.
14. The method of claim 12, wherein if the number of the parameter sets is (kN+L), the group is generated by binding N
of the parameter sets together and is represented by M bits, and a last group is generated by binding L of the parameter sets together and is represented by P bits.
15. An apparatus for encoding an audio signal, comprising an encoder configured for:

determining a number of time slots and a number of parameter sets, the parameter sets including one or more parameters;

generating information indicating a position of at least one time slot in an ordered set of time slots to which a parameter set is applied;

encoding the audio signal as a bitstream including a frame, the frame including the ordered set of time slots; and inserting a variable number of bits in the bitstream that represent the position of the time slot in the ordered set of time slots, wherein the variable number of bits is determined from the time slot position.
16. An apparatus for decoding an audio signal, comprising a decoder configured for:

receiving a bitstream representing an audio signal, the bitstream having a frame;

determining a number of time slots and a number of parameter sets from the bitstream, the parameter sets including one or more parameters;

determining position information from the bitstream, the position information indicating a position of a time slot in an ordered set of time slots included in the frame to which the parameter set is applied; and decoding the audio signal based on the number of time slots, the number of parameter sets and the position information, wherein the position information is represented by a variable number of bits based on the time slot position.
17. A data structure for inclusion in a bitstream representing an audio signal, the data structure comprising:

a first field including a number of time slots;

a second field including a number of parameter sets; and a third field including position information for determining a position of a time slot to which a parameter set is applied, wherein the position information is represented by a variable number of bits based on the time slot position.
18. A computer-readable medium having stored thereon instructions which, when executed by a processor, causes the processor to perform the operations of:

receiving a bitstream representing an audio signal, the bitstream having a frame;

determining a number of time slots and a number of parameter sets from the bitstream, the parameter sets including one or more parameters;

determining position information from the bitstream, the position information indicating a position of a time slot in an ordered set of time slots included in the frame to which the parameter set is applied; and decoding the audio signal based on the number of time slots, the number of parameter sets and the position information, wherein the position information is represented by a variable number of bits based on the time slot position.
19. A system, comprising:
a processor;

a computer-readable medium coupled to the processor and including instructions, which when executed by a processor, causes the processor to perform the operations of:

receiving a bitstream representing an audio signal, the bitstream having a frame;

determining a number of time slots and a number of parameter sets from the bitstream, the parameter sets including one or more parameters;

determining position information from the bitstream, the position information indicating a position of a time slot in an ordered set of time slots included in the frame to which the parameter set is applied; and decoding the audio signal based on the number of time slots, the number of parameter sets and the position information, wherein the position information is represented by a variable number of bits based on the time slot position.
20. A system, comprising:

means for receiving a bitstream representing an audio signal, the bitstream having a frame;

means for determining a number of time slots and a number of parameter sets from the bitstream, the parameter sets including one or more parameters;

means for determining position information from the bitstream, the position information indicating a position of a time slot in an ordered set of time slots included in the frame to which the parameter set is applied; and means for decoding the audio signal based on the number of time slots, the number of parameter sets and the position information, wherein the position information is represented by a variable number of bits based on the time slot position.
CA2620627A 2005-08-30 2006-08-30 Apparatus for encoding and decoding audio signal and method thereof Active CA2620627C (en)

Applications Claiming Priority (25)

Application Number Priority Date Filing Date Title
US71211905P 2005-08-30 2005-08-30
US60/712,119 2005-08-30
US71920205P 2005-09-22 2005-09-22
US60/719,202 2005-09-22
US72300705P 2005-10-04 2005-10-04
US60/723,007 2005-10-04
US72622805P 2005-10-14 2005-10-14
US60/726,228 2005-10-14
US72922505P 2005-10-24 2005-10-24
US60/729,225 2005-10-24
KR10-2006-0004063 2006-01-13
KR1020060004057A KR20070025904A (en) 2005-08-30 2006-01-13 Method of effective bitstream composition for the spatial parameter band number of a lfe-channel for multi-channel audio coding
KR10-2006-0004065 2006-01-13
KR10-2006-0004057 2006-01-13
KR1020060004062A KR20070037974A (en) 2005-10-04 2006-01-13 Method of effective bitstream composition for the spatial parameter band number for non-guided coding in multi-channel audio coding
KR10-2006-0004062 2006-01-13
KR20060004065 2006-01-13
KR10-2006-0004055 2006-01-13
KR1020060004063A KR20070025907A (en) 2005-08-30 2006-01-13 Method of effective bitstream composition for the parameter band number of channel conversion module in multi-channel audio coding
KR1020060004051A KR20070025903A (en) 2005-08-30 2006-01-13 Method of effective bitstream composition for the spatial parameter band number of residual signal in multi-channel audio coding
KR20060004055 2006-01-13
KR10-2006-0004051 2006-01-13
US76253606P 2006-01-27 2006-01-27
US60/762,536 2006-01-27
PCT/KR2006/003420 WO2007027050A1 (en) 2005-08-30 2006-08-30 Apparatus for encoding and decoding audio signal and method thereof

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CA2620627A1 true CA2620627A1 (en) 2007-03-08
CA2620627C CA2620627C (en) 2011-03-15

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US (12) US7783493B2 (en)
EP (7) EP1941497B1 (en)
JP (7) JP2009506372A (en)
AT (2) ATE455348T1 (en)
AU (1) AU2006285538B2 (en)
BR (1) BRPI0615114A2 (en)
CA (1) CA2620627C (en)
TW (2) TWI425843B (en)
WO (7) WO2007027050A1 (en)

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