Create extract_fbank.sh

extract_fbank.sh

@@ -0,0 +1,57 @@
+#!/bin/bash
+. ./cmd.sh || exit 1;
+
+nj=16     # number of parallel jobs in feature extraction
+sampling_rate=16000        # sampling frequency
+fmax=       # maximum frequency
+fmin=         # minimum frequency
+num_mels=80     # number of mel basis
+fft_size=1024   # number of fft points
+hop_size=256    # number of shift points
+win_length=  # window length
+
+train_set="train" # name of training data directory
+dev_set="val"           # name of development data directory
+eval_set="val"         # name of evaluation data directory
+
+stage=0
+stop_stage=100
+
+. parse_options.sh || exit 1;  # This allows you to pass command line arguments, e.g. --fmax 7600
+set -eo pipefail
+
+datadir=$PWD/data
+featdir=$PWD/feats
+
+if [ "${stage}" -le 0 ] && [ "${stop_stage}" -ge 0 ]; then
+    echo "Fbank Feature Extraction"
+    for x in ${train_set} ${dev_set} ${eval_set} ; do
+        utils/fix_data_dir.sh ${datadir}/${x}
+        make_fbank.sh --cmd "${train_cmd}" --nj ${nj} \
+            --fs ${sampling_rate} \
+            --fmax "${fmax}" \
+            --fmin "${fmin}" \
+            --n_fft ${fft_size} \
+            --n_shift ${hop_size} \
+            --win_length "${win_length}" \
+            --n_mels ${num_mels} \
+            ${datadir}/${x} \
+            exp/make_fbank/${x} \
+            ${featdir}/fbank/${x}
+        mv ${datadir}/${x}/feats.scp ${featdir}/fbank/${x}
+    done
+fi
+
+if [ "${stage}" -le 1 ] && [ "${stop_stage}" -ge 1 ]; then
+    echo "Cepstral Mean Variance Normalization"
+    feat_name=fbank
+    compute-cmvn-stats.py scp:${featdir}/${feat_name}/${train_set}/feats.scp ${featdir}/${feat_name}/${train_set}/cmvn.ark
+    for x in ${train_set} ${dev_set} ${eval_set} ; do
+        echo "Applying normalization for dataset ${x}"
+        mkdir -p ${featdir}/normed_${feat_name}/${x} ;
+        apply-cmvn.py --norm-vars=true --compress True \
+                    ${featdir}/${feat_name}/${train_set}/cmvn.ark \
+                    scp:${featdir}/${feat_name}/${x}/feats.scp \
+                    ark,scp:${featdir}/normed_${feat_name}/${x}/feats.ark,${featdir}/normed_${feat_name}/${x}/feats.scp
+    done
+fi