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Thread: AMR Voice Quality Improvement Based on PLVA

  1. #1
    Senior Member Reputation: 633
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    2014-03-10
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    Default AMR Voice Quality Improvement Based on PLVA

    dear
    i wanna share with you a good feature to Imorpve the MOS ,thanks


    4.jpg

    Instead of selecting only the most optimal path, the PLVA selects the top N (N is 4 in this document) optimal paths and performs CRC on the data decoded on these paths. The PLVA only exports data that passes the CRC. If the data decoded on these paths fails the CRC, the PLVA exports the data decoded on the most optimal path, which is the same path selected by the Viterbi algorithm. The PLVA outperforms the Viterbi algorithm because it chooses the data decoded on multiple paths, which include the optimal one selected by the Viterbi algorithm. Therefore, when the data decoded by the Viterbi algorithm is correct, the data decoded by the PLVA is also correct. However, when the data decoded by the PLVA is correct, the data decoded by the Viterbi algorithm is not necessarily correct because there are occasions when the data decoded on the optimal path is incorrect whereas the data decoded on other paths selected by the PLVA is correct. In simulations where the PLVA selects four paths, the signal-to-noise ratio (SNR) is 0.2 to 0.8 dB greater than that produced by the Viterbi algorithm.

    below the result fter activation
    2.JPG

    1.JPG

  2. Thanks justdream, electron thanked for this post
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  4. #2
    Senior Member Reputation: 396
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    Default Re: AMR Voice Quality Improvement Based on PLVA

    Dear,
    Kindly what's the average value you have for this counter in your network:
    VS.PLVA.User

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