Technology Detail
Noise Robust Vocoders Comparison
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Male talker in UH-60 Black Hawk Helicopter noise environment (113 dBC SPL)
Signal Source |
Audio Clip |
Description |
B&K Microphone |
|
Output from standard omni microphone placed 1 meter from talker to monitor the room noise environment. In high-noise environments the talker's voice is not detectable. |
M175 Microphone |
Output from close-talking noise-canceling microphone boom mounted near the talkers lips. |
|
16 kbps CVSD |
M175 signal input to standard CVSD vocoder. |
|
2400 bps LPC10 |
M175 signal input to standard LPC10 vocoder. |
|
2400 bps MELPe |
M175 signal input to standard MELPe vocoder (including its noise-preprocessor). |
|
600 bps MELPe |
M175 signal input to standard MELPe vocoder (including its noise-preprocessor). |
|
300 bps NRV |
M175 signal input to the Raytheon BBN Technologies' Noise Robust Vocoder (NRV). NRV allows for better noise-filtering and speech intelligibility at a much lower data rate. |
