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Thread: RVLC Question

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    RVLC Question

    I have a simple question that I can't seem to find the answer to anywhere online. What is the definition of a symmetric codeword (in binary format)? I thought I had seen somewhere that a symmetric codeword contained an even number of zeros. But I am not sure if this is true or if there are any other requirements. I am working on implementing an RVLC scheme and need to make sure I have this right. Thanks!

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    Administrator Shelwien's Avatar
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    google showed me this:
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    Quote Originally Posted by pessen View Post
    I have a simple question that I can't seem to find the answer to anywhere online. What is the definition of a symmetric codeword (in binary format)? I thought I had seen somewhere that a symmetric codeword contained an even number of zeros. But I am not sure if this is true or if there are any other requirements. I am working on implementing an RVLC scheme and need to make sure I have this right. Thanks!
    I suck at definitions but I will go out on a limb since you ask
    symmetric to me would be things like 0110 last half mirror image
    of front half. While anti-symmetric would be like 0101 last half the
    opposite of front half. My question is what does RLVC mean does this
    mean you can read the bit stream in either direction. If so would something
    life a Fibonacci code value work?

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    Administrator Shelwien's Avatar
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    Quote Originally Posted by wikipedia
    For AAC, three custom-tailored methods were developed and defined in MPEG-4 Audio

    * Huffman Codeword Reordering (HCR) to avoid error propagation within spectral data;
    * Virtual Codebooks (VCB11) to detect serious errors within spectral data;
    * Reversible Variable Length Code (RVLC) to reduce error propagation within scale factor data.

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