| 摘要 |
Voice quality enhancement is performed in the network directly on the bit stream of encoded speech in order to avoid additional speech decoding/encoding in the network signal path. Partial or complete decoding is used to analyze the speech signal and to provide information to a bit-stream based speech processing unit. In general, only selected bits are modified in the bit stream, e.g., the excitation gain or the vocal tract parameters, while the remaining bits remain unchanged. No decoding and encoding is required in the network signal path and, as such, tandem free operation is supported. In one exemplary embodiment, voice quality enhancements such as noise compensation, noise reduction, automatic level control, and acoustic echo control are performed on the bit stream.
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