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Phase Transmission in Sinusoidal Audio and Speech Coding

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In sinusoidal coding, frequency tracks are formed in the encoder and the amplitude and frequency information of a track is transmitted. Phase is usually not transmitted, but reconstructed at the decoder by assuming that the phase is the integral of the frequency. Such a reconstructed phase accumulates inaccuracies, leading to audible artifacts. To prevent this, a mechanism is proposed to transmit phase information of sinusoidal tracks. The unwrapped phase is quantised and transmitted. The frequencies are not transmitted, but restored from the phase information by differentiation.

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AES - Audio Engineering Society