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Discussion Groups | Speech Coding | General queries in G.723.1
Technical discussions related to Speech Coding (all itu and other vocoders, ACELP, CELP, AMR, etc)
General queries in G.723.1 - Sameer Kibey - Jun 14 7:54:00 2002
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Hello everyone! Here are a few queries wrt G.723.1: 1.The G.723.1 recommendation specifies a total algoritmic delay of 37.5 ms.Out of this 30 ms is due to the frame size.The remaining 7.5 ms is due to "look ahead delay".What is meant by look ahead delay? 2.In pitch estimation,the limits for open loop pitch lag are from 18 to 142. Now, the analysis frame size is 120 samples (2 subframes) which is less than the max possible lag. How are pitch periods greater than 120 detected? 3.What is meant by long term DC component/vector wrt LSP? (The first step in LSP VQ in the standard is obtaining DC removed LSP vector). Thank you! Sameer Kibey. |
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