Novel Codec Structures for Noise Feedback Coding of Speech
Juin-Hwey Chen · 2006
This paper presents several novel codec structures for Noise Feedback Coding (NFC) incorporating both long-term and short-term noise spectral shaping, as well as long-term and short-term prediction. In addition, the paper generalizes the conventional scalar-quantization-based NFC to vector-quantization-based NFC, and it lays the foundation for the associated efficient VQ codebook search and closed-loop VQ codebook design. BroadVoice®16, a Packet Cable 1.5 mandatory narrowband speech codec standardized by Cable Labs®for Voice over Cable in North America, is based on one of such novel NFC codec structures.