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제안 방법
- The proposed coder has three different bitrate modes, and the embedded bitstream was implemented by modifying the algebraic codebook search method used in the AMR-WB coder. Even though our coder can provide the advantage of scalability, it was implemented without any additional functional unit for evaluating two different code vectors of the higher bitrate modes. The experimental results show that our coder provides scalability while maintaining the same or better quality for all different bitrate modes with a slightly increased bitrate caused by the decreased coding efficiency of the pulse encoding in the algebraic codebook.
- In view of using multi-excitation for bitrate scalability, the proposed coding scheme is similar to general multi-stage excitation coding based on an embedded coding approach [5]. However, the proposed coder can be implemented with a very simple embedded scheme by modifying the codebook search procedure adopted in the AMR-WB codec.
이론/모형
- Figure 2 shows the procedure to find the three optimum code vectors for the proposed embedded coding structure. In the proposed embedded coder, the algebraic codebook is searched by using the depth-first tree search method adopted in the 12.65 kbps mode AMR-WB [1]. However, while the AMR-WB coder can only get one code vector for the selected operation mode, the embedded coder can get three code vectors simultaneously by extending the search procedure of the depth- first tree search method.
- In this letter, we proposed an embedded coding structure based on the standard AMR-WB coder. The proposed coder has three different bitrate modes, and the embedded bitstream was implemented by modifying the algebraic codebook search method used in the AMR-WB coder. Even though our coder can provide the advantage of scalability, it was implemented without any additional functional unit for evaluating two different code vectors of the higher bitrate modes.
- In this letter, we propose an embedded ACELP speech coding structure based on the AMR-WB standard codec without any additional functional unit. The proposed embedded speech coder has three different bitrates, and the embedded bitstream can be obtained by modifying the algebraic codebook search method used in the AMR-WB codec.
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