高清语音AMR-WB在现网为什么没有使用呢

通信友好用户

3GPP定义了9种高清语音AMR-WB的编码方式，其中12.65k bps的语音质量优异，消耗的资源也不多，为什么没有在现网使用呢？

• Mandatory multi-rate     configuration
  
  
    
  • 6.60 kbit/s      (used for circuit switched GSM and UMTS connections; should only be used      temporarily during bad radio connections and is not considered wideband      speech)
      
  • 8.85 kbit/s      (used for circuit switched GSM and UMTS connections; should only be used      temporarily during bad radio connections and is not considered wideband      speech; provides quality equal to G.722 at 48 kbit/s for clean speech)
      
  • 12.65 kbit/s      (main anchor bitrate; used for circuit switched GSM and UMTS connections;      offers superior audio quality to AMR at and above this bit rate; provides      quality equal to or better than G722 at 56 kbit/s for clean speech)