NOISE REDUCTION UNIT FOR VOCODER
NOISE REDUCTION UNIT (NRU) is designed for using with
low bit rate vocoders 600-4400 bps. NRU makes noticeable positive effect
for vocoder speech depending from noise type for input signal-to-noise
ratios (SNR) 0…+20 dB.
Noise reduction algorithm is implemented as fixed point C model for PC. It may be implemented in real-time on the base of TI's TMS320c54x/c55x DSP families under contract with resources no more than 20 MIPS and 10 Kwords of memory.
Following speech files demonstrate the quality of NRU with RMELP vocoder 4400 bps:
Car noise, SNR +12 dB
Car noise, SNR +9 dB
Car noise, SNR +6 dB
Car noise, SNR +3 dB
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