IMBE PITCH TRACKING IMPROVEMENTS
Original Publication Date: 1997-Jun-01
Included in the Prior Art Database: 2002-May-29
IMBE (Improved Multiband Excitation) is a speech coding algorithm developed by DVSI (Digital Voice Systems Inc.). A version of this algo- rithm, operating at 4350 bits per second, is specified for use in APCO Project 25 compliant systems'. The pitch tracking algorithm in the encoder plays a significant role in synthesizing audio from the microphone samples and therefore is vital to overall IMBE audio quality. It is felt that audio quality in Motorola SR3.0 radio systems in real-world channel conditions can be improved by making minor changes to the version 1.5.0 IMBE pitch tracking algorithm.