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OwnerKaoru Chujo, Toshiaki Nobumoto +3inventors
InventorsKaoru Chujo, Toshiaki Nobumoto, Mitsuru Tsuboi, Naoji Fujino, Noboru Kobayashi
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On the basis of parameters representing background noise characteristics and parameters representing voice characteristics of a current frame, a voice activity detector 42 identifies whether the current frame is a non-active voice segment of background noise only or an active voice segment in which background noise has been superimposed on voice. The voice activity detector updates the background-noise characteristic parameters in each frame, irrespective of whether requirements for updating the background-noise characteristic parameters have been satisfied, in an interval of time from start of a steady operation for detection of voice activity to identification of an active voice segment. Further, the voice activity detector 42 relaxes the update requirements of the background-noise characteristic parameters based upon results of voice activity and voice non-activity detection and, when these requirements have been satisfied, updates the background-noise characteristic parameters. As a result, processing for updating the background-noise characteristics parameters will not stop, thereby allowing these parameters to reflect the latest background noise at all times. This makes it possible to identify an active voice segment and a non-active segment easily and precisely.
A method of detecting voice activity and voice non-activity in a voice activity detector for identifying, based upon parameters representing background noise characteristics and parameters representing voice characteristics of a current frame, whether the current frame is a non-active voice segment of background noise only or an active voice segment in which background noise has been superimposed on voice, and updating the background noise characteristic parameters when predetermined update requirements have been satisfied, characterized by:
A method of detecting voice activity and voice non-activity in a voice activity detector for identifying, based upon parameters representing background noise characteristics and parameters representing voice characteristics of a current frame, whether the current frame is a non-active voice segment of background noise only or an active voice segment in which background noise has been superimposed on voice, and updating the background-noise characteristic parameters when predetermined update requirements have been satisfied, characterized by:
A voice activity detection apparatus for detecting whether a segment is a non-active voice segment of background noise only or an active voice segment in which background noise has been superimposed on voice, characterized by having:
A voice activity detection apparatus for detecting whether a segment is a non-active voice segment of background noise only or an active voice segment in which background noise has been superimposed on voice, characterized by having:
A voice encoding apparatus having a voice activity detector for detecting whether a segment is a non-active voice segment of background noise only or an active voice segment in which background noise has been superimposed on voice, an active voice encoder for encoding input Voice in a voice activity interval in accordance with a predetermined encoding scheme and sending the encoded voice to a voice decoder, and a non-active voice encoder for encoding information, which is necessary to generate background noise, in a non-active voice segment and sending the encoded information to the voice decoder, characterized in that said voice activity detector has:
A voice encoding apparatus having a voice activity detector for detecting whether a segment is a non-active voice segment of background noise only or a active voice segment in which background noise has been superimposed on voice, an active voice encoder for encoding input voice in a voice activity interval in accordance with a predetermined encoding scheme and sending the encoded voice to a voice decoder, and a non-active voice encoder for encoding information, which is necessary to generate background noise, in a non-active voice segment and sending the encoded information to the voice decoder, characterized in that said voice activity detector has:
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