Abstract
This paper proposes a backward-compatible multichannel audio codec based on downmix and upmix operation. The codec represents a multichannel audio input signal with downmixed mono signal and spatial parametric data. The encoding method consists of three parts: spatial temporal analysis of audio signal, compressing multi-channel audio into mono audio and encoding mono signals. The proposed codec combines high audio quality and low parameter coding rate and the method is simpler and more effective than the conventional methods. With this method, it's possible to transmit or store multi-channel audio signals as mono audio signals. The proposed method consists of three parts. The first part analyzes the sound source location to reduce signal redundancy in the space and the time. The second part generates mono channel audio signals from multi-channel audio signals using the sound source location information. And the third part encodes the mono channel audio signals along with the sound source location information. The decoding process is the reversal process of the encoder. The proposed method is illustrated in Fig. 1.
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