Patent
Reduced vlf overload susceptibility active noise cancellation headset
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TLDR
In this paper, low frequency components of the applied noise field outside the normal range of human hearing are detected by an external sensor and isolated by a filter circuit, resulting in a modified residual signal with reduced low-frequency components.Abstract:
The susceptibility of an active noise cancellation system to overloading due to very low frequencies is reduced by subtracting the low frequency components of an applied noise field from the residual signal. Low frequency components of the applied noise field outside the normal range of human hearing are detected by an external sensor (14) and isolated by a filter circuit (15). The isolated low frequency signal is subtracted from the residual signal, resulting in a modified residual signal with reduced low frequency components. The cancellation system thus eliminates very low frequency cancellation signals, without sacrificing bandwidth or system performance within the audible range.read more
Citations
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PatentDOI
Noise cancellation apparatus
Douglas Andrea,Martin Topf +1 more
TL;DR: In this article, the authors propose an approach for reducing acoustic background noise for use with a telephone handset (10) or a boom microphone device (100) or an audio boom headset (401) or the like.
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References
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PatentDOI
Noise cancellation apparatus
Douglas Andrea,Martin Topf +1 more
TL;DR: In this article, the authors propose an approach for reducing acoustic background noise for use with a telephone handset (10) or a boom microphone device (100) or an audio boom headset (401) or the like.
PatentDOI
Active noise reduction system
Edwin Langberg,F. Gerald Caruso +1 more
TL;DR: In this paper, an in-the-ear implementation of an electro-acoustical feedback system is presented, where a bilateral transducer serves simultaneously as a speaker to generate sound and as a microphone to sense sound in a controlled volume.
Patent
Method and apparatus for low frequency active attenuation.
TL;DR: A low frequency attenuation method based on the virtual earth system has the driver feeding cancelling waveforms into a partially closed volume which contains the microphone of the virtual Earth feed-back loop as mentioned in this paper.
PatentDOI
Noise reduction system
TL;DR: In this paper, a low pass filter is provided for extending the bandwidth of the system but which does not introduce unduly large phase shifts, while a high pass filter for reducing low frequency signals is provided in a feedback loop between the sound generator and microphone.
PatentDOI
Active acoustic attenuation system with differential filtering
TL;DR: In this paper, an adaptive active acoustic attenuation system is provided with extended frequency range to attenuate undesired noise which was previously filtered out to avoid instability of the adaptive model, which operates in its stable region to provide accurate well behaved correction signals to the cancelling loudspeaker, while still receiving a low frequency input noise signal from the input microphone including frequencies below such range.