Low delay analysis/synthesis schemes for joint speech enhancement and low bit rate speech coding
نویسندگان
چکیده
In this contribution we discuss methods to reduce the algorithmic delay of joint speech enhancement and low bit rate speech coding algorithms. We introduce a novel overlap/add scheme which can reduce the overall delay of the joint system for some speech coders considerably. The new scheme takes advantage of the fact that some low bit rate coders store a signi cant amount of look-ahead samples in their input bu er. The look-ahead samples often have less in uence on the parameter estimation than the samples in the current frame. Therefore, these samples might be used by the coder without being fully overlapped or reconstructed and with only little e ect on the quality of the coded speech. The concept has been successfully used for joint enhancement and coding using the 2.4 kbps versions of the MELP and the WI speech coders.
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