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Reply To: AMR speech codec


In case there are errors in the frame, then these errors are fixed by using error correction bits. If the decoder fails to correct these errors, then you have a bad frame. In order to lower the number of bad frames (lower the Frame Error Ratio), we increase the error correction bits, and this lowers the bit rate.

So using 4.75 bit rate you should have less bad frames then in 5.90 bit rate.