Fractional-bit and value-location lossless encoding in G.711.0 coder

The paper describes two lossless coding tools employed in the new ITU-T G.711.0 Recommendation: fractional-bit and value-location encoding. Instead of encoding each sample individually as done in G.711, the fractional-bit coding tool identifies the total number of signal levels that exist within an input frame and then combines several samples for joint encoding with fractional-bits per sample. The value-location tool encodes positions of all values within an input frame that differ from a reference value. The method efficiently represents an input frame as a sum of value-location code vectors that are sequentially encoded using Rice, binary, or explicit location encoding. Presented results illustrate how the described coding techniques were adopted for usage within the new ITU-T G.711.0 standard.