Digital Signal Processing Reference
In-Depth Information
over subbands, becomes very small, it may trigger a noise update
under certain circumstances. An estimate of frame total energy is
also provided by the spectral deviation estimator. The noise energies are
updated if the voice metric is less than a threshold. Otherwise, the spectral
deviation is used to decide on a “forced noise update”.
When a speech pause is detected, the subband adaptive filters are
adapted, and the noise spectrum estimate of the Wiener filter
in Eq.
(3) is updated.
Figure 10-4.
Block diagram of the employed VAD on the hardware platform.
3.
NOISE & SPEECH FOR SYSTEM EVALUATION
The performance of the hybrid SAFWF system was evaluated employing
several noises recorded by two input microphones in real-life situations. The
sampling frequency was 16 kHz and the microphone spacing was set to
