Jumps to site home page. Jumps to site home page. Jumps to the campus home page U.S. Department of Commerce Labs in Boulder, Colorado. Jumps to U.S. Department of Commerce home page.
Site Map | Contact | Opportunities

Outreach

Project 25 Documents & Standards Reference

Revised Jan 29, 2013
Click to enter Feedback

Vocoder Documents

Mandatory

Provides guidance necessary to meet the mandatory P25 vocoder standard.

Description and Specification Documents

Overview (Informative)

(No documents are planned)

Protocol (Normative)

  • Project 25 Vocoder Description, ANSI/TIA-102.BABA (Dec 2003)

  • (Multi-Band Excitation Speech Model, Speech Input/Output Requirements, Speech Analysis, Parameter Encoding and Decoding, Bit Manipulations, Spectral Amplitude Enhancement, Adaptive Smoothing, Parameter Encoding Example, Speech Synthesis)

  • Project 25 TDMA Half-Rate Vocoder — Addendum 1, TIA-102.BABA-1 (Jul 2009)

Testing Documents

Conformance Tests Procedures

  • Project 25 Vocoder Evaluation Mean Opinion Score Test, TSB-102.BABE (May 2007)

  • (Vocoder Descriptions, Radio Channel Model, Acoustic Background Noise, Speech Database Requirements, Speech Database Reference Conditions, Production of Digital Vocoder Recorded Files, Subjective Evaluation of Speech Quality, MOS Result Analysis)

  • Project 25 Vocoder Mean Opinion Score Conformance Test, ANSI/TIA-102.BABB (May 1999)

  • (Speech Databases, Production of Digital Vocoder Recorded Tapes, Subjective Evaluation of Speech Quality, MOS Result Analysis)

  • Project 25 Vocoder Reference Test, ANSI/TIA-102.BABC (Apr 1999)

  • (A25VCTS Operation Manual, Test Computer Hardware and I/O Circuitry, Test Computer Software, Objective Performance Requirements)

  • Project 25 Vocoder Selection Process, TSB-102.BABD (May 1996)

  • (Evaluation procedures for assessing various digital voice coding technology proposals for Project 25)

Measurement Methods

  • Project 25 Experiment 3 MOS Test Plan for Vocoder Technology for Project 25, Phase 2, TSB-102.BABF (Mar 2008)

  • (Methodology to evaluate the voice quality of LMR systems using various vocoders under a variety of noise levels and operating conditions, including fire truck and police cruiser noise levels with and without sirens, helicopters, and Coast Guard outboard boats.)

Performance Recommendations

  • Project 25 Enhanced Vocoder Methods of Measurement for Performance, TIA-102.BABG (Mar 2010)

Interoperability Test Procedures

(No documents are currently under development)

Compliance Assessment Documents

(No documents are currently under development)