March 2010 Archives

In this article, the first of a series covering HD Voice, we discuss the issue of audio bandwidth for VoIP systems, and in particular, how much audio bandwidth do you actually need for voice?

Voice communications systems in use today are based on traditional telephony standards that haven't changed much since the 1950s. These standards were set at that time and limit the information bandwidth for voice communications to 300-3400Hz (200-3200Hz in the US and Japan). However, if one analyses normal conversational speech, it typically covers the frequency range 0-8000Hz. In fact, only 20 percent of the frequencies utilized by the human voice are transmitted in the 300Hz to 3.4kHz range. Furthermore, the human ear is capable of hearing frequencies up to 18 or 20kHz. Back when these standards were set, it was felt that a voice channel limited to 3.4kHz would be good enough and ever since that time we have all accepted that telephone conversations would have a slightly muffled tone.
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Thursday

  • Aculab tweeted, "New Blog: 'The kiss of life for caller authentication' Ian Colville explores the benefits #voicebiometrics bring to caller authentication; how to address common challenges & how to deliver a #secure and efficient CX #VoiSentryhttp://ow.ly/fHAA50v11oB "

Sunday

  • Aculab tweeted, "If you're thinking about adding #voicebiometrics to your contact centre or customer service application, this guide will help with areas such as user enrolment, multi-factor authentication & handling identity claims #CustomerExperience #HearTheDifference http://ow.ly/Fdn150uYuc7 pic.twitter.com/RBOruUpV75"

Thursday

  • Aculab tweeted, "Welcome #VoiSentry from @aculab to the DevConnect Marketplace! VoiSentry is voice biometrics tech that enables speaker verification, cost-effectively, to virtually any telephony-based application. https://www.devconnectmarketplace.com/marketplace/aculab/voisentry …"

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  • Aculab tweeted, ".@aculab voice #biometrics solution now ‘Avaya Compliant’https://www.biometricupdate.com/201906/aculabs-voice-biometric-solution-now-avaya-compliant …"

Monday

  • Aculab tweeted, "Lab-quality voice recordings can be used to accurately identify people diagnosed with Parkinson's disease. These researchers made these assessments more cost-effective and practical by using telephone-quality recordings: https://doi.org/10.1121/1.5100272 … @SomervilleOx @aculab @EdinUniUsherpic.twitter.com/ZoJ9ktJlnW"
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