A voice activity detector (100) filters (204) out noise energy and then computes a high-frequency (2400 Hz to 4000 Hz) versus low-frequency (100 Hz to 2400 Hz) signal energy ratio (224), total voiceband (100 Hz to 4000 Hz) signal energy (214), and signal periodicity (208) on successive frames of signal...http://www.google.es/patents/US20020165711?utm_source=gb-gplus-sharePatente US20020165711 - Voice-activity detection using energy ratios and periodicity
Voice-activity detection using energy ratios and periodicity
Número de solicitud: 09/813,525 Número de publicación: US 2002/0165711 A1 Fecha de presentación: 21 Mar 2001 Patente emitida: US7171357 ( Fecha de emisión 30 Ene 2007)
