Khalifa, Othman Omran and Khan, Sheroz and Islam, Md. Rafiqul and Muktar, Mohd and Yaacob, Zahrein
(2004)
Speech coding for Bluetooth with CVSD algorithm.
In: 2004 RF and Microwave Conference, 5 - 6 October 2004, Subang, Selangor.
Abstract
Speech coding is a procedure used to
represent a digital speech signal by as minimum bits as
possible, maintaining at the same time a reasonable
level of speech quality. Due to increasing demand for
speech communications, speech coding technology has
received a lot o f researcher's interests. Speech coding
is performed using numerous steps or operations
specified as an algorithm. This paper presents the
Continuously Variable Slope Delta (CVSD) speech
coding method which is widely used in Bluetooth
applications. It is a nonlinear sampled data feedback
system which accepts a band limited analog signal and
encodes it into binary form for transmission through a
digital channel. At the receiver, the binary signal is
decoded into a close approximation of original analog
signal. This coding technique is implemented in
Matlab Simulink and the simulation results shown
coding has good noise immunity. Further, shown in
this work is the fact that damaged packets are
discarded straight away without having a serious
impact on the speech quality making it more suitable
for two way audio communications.
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