Streaming vocoder

A system comprising:

• data processing hardware;
• and
• memory hardware in communication with the data processing hardware, the memory hardware storing instructions that when executed on the data processing hardware cause the data processing hardware to perform operations comprising:
• receiving a current spectrogram frame;
• reconstructing a phase of the current spectrogram frame by:
• for each corresponding committed spectrogram frame in a sequence of M number of committed spectrogram frames preceding the current spectrogram frame, obtaining a value of a committed phase of the corresponding committed spectrogram frame;
• and
• estimating the phase of the current spectrogram frame by performing one or more iterations within a sliding window that contains the current spectrogram frame, wherein performing each iteration of the one or more iterations within the sliding window comprises:
• estimating an uncommitted phase of the current spectrogram frame based on a sequence of N number of uncommitted spectrogram frames within the sliding window that are subsequent to the current spectrogram frame;
• and
• updating a complex-valued spectrogram representation within the sliding window by combining the value of the committed phase of each corresponding committed spectrogram frame in the sequence of M number of committed spectrogram frames preceding the current spectrogram frame, the estimated uncommitted phase, and a magnitude of the current spectrogram frame;
• and
• for the current spectrogram frame, synthesizing a new time-domain audio waveform frame based on the estimated phase of the current spectrogram frame.