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TIA-127

Enhanced Variable Rate Codec, Speech Service Options 3, 68, 70, 73, and 77 for Wideband Spread Spectrum Digital Systems

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Organization: TIA
Publication Date: 1 September 2012
Status: active
Page Count: 367
scope:

Service Options 3, 68, 70, 73 and 77 provide two-way voice communications between the base station and the mobile station using the dynamically variable data rate speech codec algorithm described in this standard. The transmitting speech codec takes voice samples and generates an encoded speech packet for every Traffic Channel frame.† The receiving station generates a speech packet from every Traffic Channel frame and supplies it to the speech codec for decoding into voice samples.

Speech codecs communicate at one of four rates corresponding to the 9600 bps, 4800 bps, 2400 bps, and 1200 bps frame rates. However, Service Options 3 and 70 do not use 2400 bps frame rate.

The specifications defined in Sections 4 and 5 of this document provide the detailed algorithmic description of the EVRC. In the case of a discrepancy between the floating point and algorithmic descriptions, the reference floating point c-code will prevail. The specifications defined in Input Signal Preprocessing (see 4.4), Determining the Data Rate (see 4.8), and Adaptive Postfilter (see 5.9 and 5.10) are optional for implementations intended for varying operational environments (such as in-vehicle hands-free). Any implementations which deviate from the algorithms specified in this standard, shall meet the minimum performance requirements defined in the associated Minimum Performance Specifications.

Document History

TIA-127
September 1, 2012
Enhanced Variable Rate Codec, Speech Service Options 3, 68, 70, 73, and 77 for Wideband Spread Spectrum Digital Systems
Service Options 3, 68, 70, 73 and 77 provide two-way voice communications between the base station and the mobile station using the dynamically variable data rate speech codec algorithm described in...
November 1, 2011
Enhanced Variable Rate Codec Speech Service Options 3, 68, 70 and 73 for Wideband Spread Spectrum Digital Systems
Service Options 3, 68, 70, and 73 provide two-way voice communications between the base station and the mobile station using the dynamically variable data rate speech codec algorithm described in...
July 1, 2011
Enhanced Variable Rate Codec Speech Service Options 3, 68, 70 and 73 for Wideband Spread Spectrum Systems Digital Systems
Service Options 3, 68, 70, and 73 provide two-way voice communications between the base station and the mobile station using the dynamically variable data rate speech codec algorithm described in...
February 1, 2007
Enhanced Variable Rate Codec, Speech Service Options 3, 68, and 70 for Wideband Spread Spectrum Digital Systems
General Description Service Options 3, 68, and 70 provide two-way voice communications between the base station and the mobile station using the dynamically variable data rate speech codec algorithm...
December 1, 2006
Enhanced Variable Rate Codec Speech Service Option 3 and YY for Wideband Spread Spectrum Digital Systems
A description is not available for this item.
May 1, 2004
Enhanced Variable Rate Codec Speech Option 3 for Wideband Spread Spectrum Digital Systems
General Description Service Option 3 provides two-way voice communications between the base station and the mobile station using the dynamically variable data rate speech codec algorithm described in...
September 1, 2001
Enhanced Variable Rate Codec, Speech Service Option 3 for Wideband Spread Spectrum Digital Systems Addendum 3
A description is not available for this item.
September 1, 1999
Enhanced Variable Rate Codec, Speech Service Option 3 for Wideband Spread Spectrum Digital Systems Addendum 2
A description is not available for this item.
August 1, 1998
Enhanced Variable Rate Codec, Speech Service Option 3 for Wideband Spread Spectrum Systems - Addendum 1
A description is not available for this item.
January 1, 1997
Enhanced Variable Rate Codec, Speech Service Option 3 for Wideband Spread Spectrum Digital Systems
A description is not available for this item.
January 1, 1997
Enhanced Variable Rate Codec, Speech Service Option 3 for Wideband Spread Spectrum Digital Systems
A description is not available for this item.
January 1, 1997
Enhanced Variable Rate Codec, Speech Service Option 3 for Wideband Spread Spectrum Digital Systems
A description is not available for this item.

References

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