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The Effect of Audio Bandwidth on Selected Digital Speech Coding Algorithms

The speech intelligibility in noise of three different digital speech coding algorithms was investigated at the standard audio bandwidth of 300 to 3400 Hz and a developmental bandwidth of 100-6000 Hz. Speech intelligibility was measured using a standardized instrument, the Modified Rhyme Test (MRT). Performance was investigated at three different levels of an acoustic noise environment. This report presents results, discussion, conclusions and recommendations for further research.