Patent ID: 7099823

Claim:
A coded voice signal format converting apparatus for converting a format of a coded voice signal between two different voice coding/decoding systems comprising: a first decoding device used to decode said coded voice signal whose format has not been converted and to produce a first voice signal in accordance with a first voice coding/decoding system; a second coding device used to code said first voice signal and to produce a coded voice signal whose format has been converted in accordance with a second voice coding/decoding system; and wherein said first decoding device includes: a quantizing accuracy information decoding section to decode a first quantizing accuracy information coded into said coded voice signal whose format has not been converted and generating a first quantized accuracy information signal, a mapped signal generating section to decode and inverse-quantize, a quantized value coded into said coded voice signal whose format has not been converted in accordance with said first quantizing accuracy information and to produce a first mapped signal and wherein said second coding device includes: a quantizing accuracy information converting section receiving said first quantized accuracy information signal from said quantizing accuracy information decoding section of said first decoding device, and in response thereto determining a second quantizing accuracy information and a mapped signal coding section to quantize and code a voice signal output from said first decoding device based on said second quantizing accuracy information and to produce a coded voice signal whose format has been converted.