Adaptive window-size selection in transform coding

摘要: A transform coder adaptively configures window sizes for coding in a two-pass process to maximize efficiency, while achieving necessary time resolution avoid pre-echo. In first pass, the places small size windows over detected transient regions of an input signal open-loop configuration process. second adjusts according measurements achieved quality closed-loop Where measurement shows unacceptable quantization noise, increases size. pre-echo is detected, reduces within bit rate constraints.