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- Enhanced_Variable_Rate_Codec abstract "Enhanced Variable Rate CODEC (EVRC) is a speech codec used in CDMA networks. It was developed in 1995 to replace the QCELP vocoder which used more bandwidth on the carrier's network, thus EVRC's primary goal was to offer the mobile carriers more capacity on their networks while not increasing the amount of bandwidth or wireless spectrum needed. EVRC uses RCELP technology, which Qualcomm claims improves speech quality with lower bit rates.[citation needed]EVRC compresses each 20 milliseconds of 8000 Hz, 16-bit sampled speech input into output frames of one of three different sizes: full rate – 171 bits (8.55 kbit/s), half rate – 80 bits (4.0 kbit/s), eighth rate – 16 bits (0.8 kbit/s). A quarter rate was not included in the original EVRC specification and eventually became part of EVRC-B. A zero length frame is included in the specification for 'null' and erasure frames. The eighth (1/8) rate is not intended for speech signals, but instead for background noise. Due to the source controlled nature of the codec the average bit rate varies based on network conditions, but is usually around 6 kbit/s.[citation needed]EVRC was replaced by SMV which retained the speech quality[citation needed] and at the same time improved network capacity.Recently, however, SMV itself has been replaced by the new CDMA2000 4GV codecs. 4GV is the next generation 3GPP2 standards-based EVRC-B codec. 4GV is designed to allow service providers to dynamically prioritize voice capacity on their network as required.EVRC can be also used in 3GPP2 container file format - 3G2.".
- Enhanced_Variable_Rate_Codec wikiPageExternalLink C.S0014-A_v1.0_040426.pdf.
- Enhanced_Variable_Rate_Codec wikiPageExternalLink EVRC.htm.
- Enhanced_Variable_Rate_Codec wikiPageID "1188566".
- Enhanced_Variable_Rate_Codec wikiPageRevisionID "541172421".
- Enhanced_Variable_Rate_Codec hasPhotoCollection Enhanced_Variable_Rate_Codec.
- Enhanced_Variable_Rate_Codec subject Category:3rd_Generation_Partnership_Project_2_standards.
- Enhanced_Variable_Rate_Codec subject Category:Speech_codecs.
- Enhanced_Variable_Rate_Codec type 3rdGenerationPartnershipProject2Standards.
- Enhanced_Variable_Rate_Codec type Abstraction100002137.
- Enhanced_Variable_Rate_Codec type Measure100033615.
- Enhanced_Variable_Rate_Codec type Standard107260623.
- Enhanced_Variable_Rate_Codec type SystemOfMeasurement113577171.
- Enhanced_Variable_Rate_Codec comment "Enhanced Variable Rate CODEC (EVRC) is a speech codec used in CDMA networks. It was developed in 1995 to replace the QCELP vocoder which used more bandwidth on the carrier's network, thus EVRC's primary goal was to offer the mobile carriers more capacity on their networks while not increasing the amount of bandwidth or wireless spectrum needed.".
- Enhanced_Variable_Rate_Codec label "EVRC".
- Enhanced_Variable_Rate_Codec label "EVRC".
- Enhanced_Variable_Rate_Codec label "Enhanced Variable Rate Codec".
- Enhanced_Variable_Rate_Codec label "Enhanced Variable Rate Codec".
- Enhanced_Variable_Rate_Codec sameAs Enhanced_Variable_Rate_Codec.
- Enhanced_Variable_Rate_Codec sameAs EVRC.
- Enhanced_Variable_Rate_Codec sameAs EVRC.
- Enhanced_Variable_Rate_Codec sameAs m.04fr5l.
- Enhanced_Variable_Rate_Codec sameAs Q3046267.
- Enhanced_Variable_Rate_Codec sameAs Q3046267.
- Enhanced_Variable_Rate_Codec sameAs Enhanced_Variable_Rate_Codec.
- Enhanced_Variable_Rate_Codec wasDerivedFrom Enhanced_Variable_Rate_Codec?oldid=541172421.
- Enhanced_Variable_Rate_Codec isPrimaryTopicOf Enhanced_Variable_Rate_Codec.