APPARATUS AND METHOD FOR CODING AND DECODING MULTI-OBJECT AUDIO SIGNAL WITH VARIOUS CHANNEL INCLUDING INFORMATION BITSTREAM CONVERSION

摘要

An apparatus and a method for coding and decoding a multi-object audio signal with various channels including supplementary information bit stream conversion are provided to provide compatibility with an existing coding and decoding apparatus by providing backward compatibility with a conventionally used bit stream. When an SAOC(Spatial Audio Object Coding) encoder(101) supports only an audio object of mono or stereo, an SAC(Spatial Audio Coding) encoder(201) outputs a single audio object from an inputted multi-channel audio signal. Also, the SAC encoder extracts a space queue and supplementary information to generate an SAC bit stream. The SAOC encoder outputs a representative downmix signal from one or more audio objects, and extracts a space queue and supplementary information to generate an SAOC bit stream. A pre-set ASI(Audio Scene Information) unit(203) configures a control signal inputted from an external source into pre-set ASI(Audio Scene Information) and generates a pre-set ASI bit stream including the pre-set ASI. A bit stream formatter(205) generates a representative SAOC bit stream by using the SAOC bit stream, the SAC bit stream, and the pre-set ASI bit stream. A transcoder(103) performs rendering on the audio object inputted into the SAOC encoder, and converts the representative SAOC bit stream into a representative SAC bit stream. An SAC decoder(105) restores the downmix signal outputted from the SAOC encoder into multi-object audio signals of various channels.