FOR IMMEDIATE RELEASE
September 28, 2009
TIA Issues Standard to Describe Project 25 Half-Rate Vocoder
TIA-102.BABA-1 Describes Interoperability Requirements for Transmitting and Receiving Voice
Arlington, Va. – The Telecommunications Industry Association (TIA), the leader in advocacy, standards development, business development and intelligence for the information and communications technology (ICT) industry, recently released TIA-102.BABA-1 Half-Rate Vocoder Annex, an addendum to its TIA-102.BABA Project 25 Vocoder Description Standard.
The original 7200 bps Project 25 Vocoder standard was selected in 1992 and subsequently standardized by TIA as TIA-102.BABA. Since then, various improvements have been developed in the industry and the original suite of Project 25 standards has diversified into Phase 1 and Phase 2. During the development of Phase 2, a need was identified for a lower rate Vocoder to facilitate higher spectral efficiency.
TIA-102.BABA-1 describes a 3600 bps "Half-Rate" Vocoder intended to meet this need. The previously published TIA-102.BABA describes the 7200 bps "Full-Rate" mode of operation. The two documents together serve as the interoperability specification for the Dual-Rate Vocoder employed within the APCO Project 25 System and Standard suite.
The focus of TIA-102.BABA-1 is to describe the interoperability requirements for transmitting and receiving voice through a Half-Rate Vocoder using a net bit rate of 2450 bps for voice data plus 1150 bps for Forward Error Correction (FEC) information, resulting in a total channel bit rate of 3600 bps.
As an addendum to TIA-102.BABA, this document relies on its parent document for description of certain aspects (including the Multi-Band Excitation Speech Model, the Speech Input/Output Characteristics, Speech Analysis, and Speech Synthesis) held in common between the Half-Rate Vocoder described in this document and the Full-Rate Vocoder described in TIA-102.BABA.
The focus of this document is a technical description of the quantization and FEC elements of the Half-Rate vocoder necessary for interoperability with the Standard. Implementation considerations and improvements/enhancements not necessary for interoperability are not discussed.
The Half Rate Vocoder description in TIA-102.BABA-1 is intended for use over a radio air interface providing 3600 bps for voice data plus FEC.
TIA-102.BABA-1 was formulated under the cognizance of TIA Engineering Committee TR-8 Mobile and Personal Private Radio Standards, TR-8.4 Subcommittee on Vocoders. To learn more about how to participate in standards development with TIA, please contact Stephanie Montgomery at smontgomery@tiaonline.org.
To obtain copies of the document, contact IHS International at +1.800.854.7179 (United States and Canada); +1.303.397.7796 (international) or visit global.ihs.com.
For technical information, please contact Ronda Coulter at rcoulter@tiaonline.org. For media inquiries, please contact Mike Snyder: msnyder@tiaonline.org.
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About TIA
The Telecommunications Industry Association (TIA) represents the global information and communications technology (ICT) industry through standards development, advocacy, tradeshows, business opportunities, market intelligence and world-wide environmental regulatory analysis. With roots dating back to 1924, TIA enhances the business environment for broadband, mobile wireless, information technology, networks, cable, satellite and unified communications. Members' products and services empower communications in every industry and market, including healthcare, education, security, public safety, transportation, government, the military, the environment and entertainment.
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