| 摘要 |
The present invention provides methods and apparatus for adjusting an algorithmic time delay of a signal encoder. An input signal is sampled at a predetermined sampling rate. When look-ahead operation is initiated, the algorithmic time delay is increased by the look-ahead time duration. When look-ahead operation is terminated, the algorithmic time delay is decreased by the look-ahead time duration. A set of input signal samples is aligned in accordance with the algorithmic time delay, and an output signal that is representative of the set of signal samples is formed. A first signal segment is added to an input signal waveform when the look-ahead operation is initiated, and a second signal segment is removed from the input signal waveform when the look-ahead operation is terminated. Pointers that point to a beginning of the current frame and to new input signal samples are adjusted when the operational mode changes.
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