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An energy-consistent lumped-element equivalent circuit model for charged circular capacitive micromachined ultrasonic transducer (CMUT) cell is derived and presented. It is analytically shown and experimentally verified that a series dc voltage source at the electrical terminals is sufficient to model the charging in CMUT. A model-based method for determining this potential from impedance measurements...
This paper proposes a novel signal transformation and interpolation approach based on the modification of DCT (Discrete Cosine Transform). The proposed algorithm can be applied to any periodic or quasi periodic waveform for time scale and/or pitch modification purposes in addition to signal reconstruction, compression, coding and packet lost concealment. The proposed algorithm has two advantages:...
This paper proposes an alternative scheme to variable bit rate (VBR) speech coding for voice over Internet protocol (VoIP) during network congestion in Internet. The proposed scheme is called “adaptive bit rate switching” and ensures that the available bandwidth is most efficiently used. When congestion is signaled, a time scale modification algorithm called WSOLA (waveform similarity overlap and...
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