This paper describes recent advances on the use of HMM based technology, for speaker independent continuous speech recognition, in noisy environment, under hands free interaction mode. For this purpose and array of four omnidirectional microphones is employed as acquisition system. The processing of phase information in the Cross-power Spectrum provides the capability both of locating talker position and of recostructing an anhanced speech spectrum. Here, two enhancement techniques are described, that allow recognition improvement in the case of clean input speech as well as under different adverse conditions. Results refer to the use of a new multichannel corpus, collected in real environment by microphone array as well as close-talk microphone
Hands Free Continuous Speech Recognition in Noisy Environment Using a Four Microphone Array
Giuliani, Diego;Matassoni, Marco;Omologo, Maurizio;Svaizer, Piergiorgio
1995-01-01
Abstract
This paper describes recent advances on the use of HMM based technology, for speaker independent continuous speech recognition, in noisy environment, under hands free interaction mode. For this purpose and array of four omnidirectional microphones is employed as acquisition system. The processing of phase information in the Cross-power Spectrum provides the capability both of locating talker position and of recostructing an anhanced speech spectrum. Here, two enhancement techniques are described, that allow recognition improvement in the case of clean input speech as well as under different adverse conditions. Results refer to the use of a new multichannel corpus, collected in real environment by microphone array as well as close-talk microphoneI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
