Audio Coding Based on Amplitude Spectrogram Quantization and Phase-reconstruction Decoding

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In this project, aiming to a new high-quality audio coding, our achievements can be summarized as follows. 1) We developed "the range-constrained phase reconstruction" technique, which is a method to synthesize well-quality time-domain signal from quantized amplitude and phase spectrogram. 2) We developed a method to automatically estimate repetitive structure of audio signals, which can be typically observed in music spectrogram, with minimum coding-length criterion, and 3) We developed a robust audio watermarking method, which embeds the information to phase spectrogram of stereo audio signals, utilizing the fact that human auditory system is not much sensitive to phase.