Development of Algorithm for Voice Operated Switch for Digital Audio Control Systems
Journal Title: International Journal of Modern Engineering Research (IJMER) - Year 2013, Vol 3, Issue 5
Abstract
VOS (voice Operated Switch) is a switch that operates when sound over a certain threshold is detected. It is usually used to turn on a transmitter or recorder when someone speaks and turn it off when they stop speaking. It is used instead of a push-to-talk button on transmitters or to save storage space on recording devices. Unlike push-to-talk (PTT) operation, VOS is automatic. The user can keep his hands free while talking. But VOS also has some significant disadvantages that explain why PTT is still common. The Present VOS technology works based on the comparison of the energy estimate in speech band and the noise band. The bandwidth of speech band is from 300Hz to 3.3 KHz and for noise band it is from 3.3 KHz to 6.6 KHz. The major disadvantage with this technique is false operation of VOS due to noise interference or heavy breathing or a side conversation. Hence, a DSP based algorithm is proposed to be developed for DACS (Digital Audio Control System) to improve the performance and the noise suppression.
Authors and Affiliations
Gokula Krishnan
Keywords
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