Add reverberation only, noise only or mix speakers with noises in close-talk & far-field scenarios.

See ./scripts/sptk/wav_simulate.py -h

1. Add reverberation

   sox asset/4ch-rir1.wav asset/4ch-rir1-ch2.wav remix 2
   # spk1_reverb_{1,2}.wav are same
   ../../scripts/sptk/wav_simulate.py \
       --src-spk asset/spk1.wav \
       --src-rir asset/4ch-rir1-ch2.wav \
       spk1_reverb_1.wav
   ../../scripts/sptk/wav_simulate.py \
       --src-spk asset/spk1.wav \
       --src-rir asset/4ch-rir1.wav \
       --dump-channel 1 \
       spk1_reverb_2.wav 

2. Add noise

   # close-talk + noise
   ../../scripts/sptk/wav_simulate.py \
       --src-spk asset/spk1.wav \
       --point-noise asset/noise.wav \
       --point-noise-snr 5 \
       spk1_noisy1.wav
   # far-field + pointsource noise
   ../../scripts/sptk/wav_simulate.py \
       --src-spk asset/spk1.wav \
       --src-rir asset/4ch-rir1.wav \
       --point-noise asset/noise.wav \
       --point-noise-snr 5 \
       --point-noise-rir asset/4ch-rir3.wav \
       spk1_noisy2.wav
   # far-field + pointsource noise + isotropic noise
   ../../scripts/sptk/wav_simulate.py \
       --src-spk asset/spk1.wav \
       --src-rir asset/4ch-rir1.wav \
       --point-noise asset/noise.wav \
       --point-noise-snr 5 \
       --point-noise-rir asset/4ch-rir3.wav \
       --isotropic-noise-snr 8 \
       --isotropic-noise asset/iso.wav \
       --isotropic-noise-offset 16000 \
       spk1_noisy3.wav

3. Mix speakers

   # close-talk (no noise)
   ../../scripts/sptk/wav_simulate.py \
       --src-spk asset/spk1.wav,asset/spk2.wav \
       --src-begin=32000,0 \
       --src-sdr=3 \
       2spk_mix1.wav
   # close-talk (noise)
   ../../scripts/sptk/wav_simulate.py \
       --src-spk asset/spk1.wav,asset/spk2.wav \
       --src-begin=32000,0 \
       --src-sdr=3 \
       --point-noise asset/noise.wav \
       --point-noise-snr 5 \
       2spk_mix2.wav
   # far-field
   ../../scripts/sptk/wav_simulate.py \
       --src-spk asset/spk1.wav,asset/spk2.wav \
       --src-rir asset/4ch-rir1.wav,asset/4ch-rir2.wav \
       --src-begin=32000,0 \
       --src-sdr=3 \
       --point-noise asset/noise.wav \
       --point-noise-snr 5 \
       --point-noise-rir asset/4ch-rir3.wav \
       --isotropic-noise-snr 8 \
       --isotropic-noise asset/iso.wav \
       --isotropic-noise-offset 16000 \
       --dump-ref-dir ref \
       2spk_mix1.wav