Training partially connected mlps for multiband systems
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Training partially connected MLPs for MULTIBAND systems. TCTS Faculté Polytechnique de Mons Belgium. Basic multiband system. Training independent neural networks for each subband. CBE subband 1. CBE subband 2. CBE subband 3. CBE subband 4. Posteriors subband 1. Posteriors subband 2.

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Training partially connected mlps for multiband systems

Training partially connected MLPsfor MULTIBAND systems

TCTS

Faculté Polytechnique de Mons

Belgium

RESPITE workshop - Sheffield


Training partially connected mlps for multiband systems

Basic multiband system

Training independent neural networks for each subband

CBE subband 1

CBE subband 2

CBE subband 3

CBE subband 4

Posteriors subband 1

Posteriors subband 2

Posteriors subband 3

Posteriors subband 4

Subband posteriors or eventually outputs of the last hidden layer (NLDA) can then be combined to take a global decision.

RESPITE workshop - Sheffield


Training partially connected mlps for multiband systems

Partially connected MLPs

If all the subband neural networks are trained on the same targets, can we train all the subband NN in one step ?

CBE subband 1

CBE subband 2

CBE subband 3

CBE subband 4

NLDA

Phoneme targets

RESPITE workshop - Sheffield


Training partially connected mlps for multiband systems

TEST

4 subband experiment on AURORA 2 data. The systems aretrained on white noise contaminated training data.

System 1, fullband NN:

1 MLP: 300 x 1000 x 33

System 2, independent NN:

4 networks (2 hidden layers): 75 x 200 x 30 x 33

A MLP is used to recombine the outputs of the last hidden layer of each subband MLP. This MLP is trained on phoneme targets: 120 x 1000 x 33

System 3, partially connected NN:

1 partially connected network: 300 x 800 x 120 x 33

Input vector is the concatenation of the four subbands.

A MLP is used to recombine the outputs of the last hidden layer.

This MLP is trained on phoneme targets: 120 x 1000 x 33

RESPITE workshop - Sheffield


Training partially connected mlps for multiband systems

TEST

4 subbands: 0-778 Hz, 707-1632 Hz, 1506-2709 Hz and 2122-4000Hz

Test on the effect off added noise on the posteriors after subband recombination. Noise N1 (subway) at 0 dB in subband 2 only compared to clean speech with the 3 systems.

Deviation of posteriors relative to clean speech (MSE)

Word error rate – aurora test A, noise 1

RESPITE workshop - Sheffield