Table 4 Experimental conditions

Sampling frequency

16 kHz

Window function in STFT

Hamming window

Window length in STFT

4096 points (256 ms)

Shift length in STFT

2048 points (128 ms)

Number of NMF bases K

Four for music case and two for

speech case

Number of iterations of update rules

200

Initial values of T _n and V _n

Uniform random values in the

range (0,1)

Initial values of W _i

Identity matrix