RU2009116275A - METHODS AND DEVICES FOR CODING AND DECODING OF OBJECT-ORIENTED AUDIO SIGNALS - Google Patents

Abstract

 1. A method for decoding an audio signal, comprising the steps of:! extracting a downmix signal and object-oriented additional information from the audio signal; ! generating a modified downmix signal based on the downmix signal and extracted information from the object-oriented additional information; ! forming channel-oriented additional information based on object-oriented additional information and control data for reproducing the down-mix signal; and! form a multi-channel audio signal based on a modified down-mix signal and channel-oriented additional information. ! 2. The method of decoding the audio signal according to claim 1, in which the object-oriented additional information contains at least one of the information of the differences of the levels of the objects, the information of the cross-correlation between the objects, the information of the amplification of the downmix, information of the differences of the levels of the channels of the downmix and information of the absolute energy of the objects . ! 3. The method for decoding an audio signal according to claim 1, in which the extracted information contains at least one of envelope information, grouping information, gain information, silence period information, level difference information and residual signal information of the object signals. ! 4. The method for decoding an audio signal according to claim 3, wherein the envelope information comprises at least one of linear prediction coding coefficient (LPC) information, energy information and power information

Claims (19)

1. A method of decoding an audio signal, comprising stages in which: extracting a downmix signal and object-oriented additional information from the audio signal; generating a modified downmix signal based on the downmix signal and extracted information from the object-oriented additional information; forming channel-oriented additional information based on object-oriented additional information and control data for reproducing the down-mix signal; and form a multi-channel audio signal based on a modified down-mix signal and channel-oriented additional information. 2. The method of decoding the audio signal according to claim 1, in which the object-oriented additional information contains at least one of the information of the differences of the levels of the objects, the information of the cross-correlation between the objects, the information of the amplification of the downmix, information of the differences of the levels of the channels of the downmix and information of the absolute energy of the objects . 3. The method for decoding an audio signal according to claim 1, wherein the extracted information comprises at least one of envelope information, grouping information, gain information, silence period information, level difference information and residual signal information of the object signals. 4. The method for decoding an audio signal according to claim 3, wherein the envelope information comprises at least one of linear prediction coding coefficient (LPC) information, energy information, and power information. 5. The method for decoding an audio signal according to claim 3, in which the envelope information contains information related to the envelope of the parts of the object signals that are dominant on the time-frequency axis. 6. The method for decoding the audio signal according to claim 1, in which the object-oriented additional information contains information related to the delay between the signal down-mixing and object-oriented additional information. 7. The method for decoding an audio signal according to claim 1, in which the object-oriented additional information contains information indicating that the audio signal is generated by object-oriented encoding, or that the audio signal is generated by channel-oriented encoding. 8. An audio decoding apparatus comprising: a demultiplexer that extracts a downmix signal and object-oriented additional information from the audio signal; an object decoder that generates a modified downmix signal based on the downmix signal and predetermined information and generates channel-oriented additional information based on object-oriented additional information and control data for reproducing the downmix signal, while the specified information is extracted from the object-oriented additional information; and a multi-channel decoder that generates a multi-channel audio signal based on a modified down-mix signal and channel-oriented additional information. 9. The audio signal decoding apparatus of claim 8, wherein the object-oriented additional information comprises at least one of information of differences of the object levels, information of cross-correlation between the objects, information of amplification of the downmix, information of the differences of the levels of the channels of the downmix and information of the absolute energy of the objects . 10. The audio signal decoding apparatus of claim 8, wherein the predetermined information comprises at least one of envelope information, grouping information, gain information, silence period information, level difference information, residual signal information, and object signal delay information. 11. The audio signal decoding apparatus of claim 10, wherein the envelope information comprises at least one of linear prediction coding coefficient (LPC) information, energy information, and power information. 12. The audio signal decoding apparatus of claim 8, wherein the object-oriented additional information contains information related to a delay between the downmix signal and the object-oriented additional information. 13. The audio signal decoding apparatus of claim 8, wherein the object-oriented additional information comprises information related to a delay between the downmix signal and the object-oriented additional information. 14. A method of encoding an audio signal, comprising the steps of: generating a downmix signal by downmixing an object audio signal; generating object-oriented additional information by extracting information related to the object audio signal and inserting predetermined information to modify the downmix signal into object-oriented additional information; and form a bit stream by combining object-oriented additional information with the given information inserted into it and a down-mix signal. 15. The audio encoding method of claim 14, wherein the information for modifying the downmix signal comprises envelope information, grouping information, silence period information, and residual signal information of the object signals. 16. The audio encoding method of claim 14, wherein the information for modifying the downmix signal comprises information regarding a delay between the downmix signal and the object-oriented additional information. 17. The method for encoding an audio signal according to 14, further comprising the step of inserting information indicating that the object signal is encoded by object-oriented encoding into the bit stream. 18. A computer-readable recording medium on which a computer program for executing a method for decoding an audio signal is stored, the method of decoding an audio signal comprises the steps of: extracting a downmix signal and object-oriented additional information from the audio signal; generating a modified downmix signal based on the downmix signal and predetermined information that is extracted from the object-oriented additional information; forming channel-oriented additional information based on object-oriented additional information and control information for reproducing the down-mix signal; and form a multi-channel audio signal based on a modified down-mix signal and channel-oriented additional information. 19. A computer-readable recording medium on which a computer program for executing a method of encoding an audio signal is stored, the method of decoding an audio signal comprises the steps of: generating a downmix signal by downmixing an object audio signal; generating object-oriented additional information by extracting information related to the object audio signal and inserting the specified information into the object-oriented additional information to modify the downmix signal; and form a bit stream by combining object-oriented additional information with the given information inserted into it and a down-mix signal.