The fundamental of speech coding is the fact that how to get better quality of reconstructed speech and ensure the less time delay and proper operational complexity at the given coding rate.

语音编码的基本问题就是在给定编码速率的条件下如何得到尽可能好的重建语音质量并保证尽可能小的编解码时延和适当的运算复杂度。

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Now there is a week's delay for its operational start as it didn't get its new vehicle certificate in time from the Department for Transport (DfT).

BBC: Week-long wait for London's new Routemaster bus