Low bit rate real‐time half duplex LPC vocoder utilizing minimal random access memory

High quality split band LPC vocoder operating at low bit rates

LPC based speech coders operating at bit rates below 3.0 kbits/sec are usually associated with buzzy or metallic artefacts in the synthetic speech. These are mainly attributable to the simplifying assumptions made about the excitation source, which are usually required to maintain such low bit rates. In this paper a new LPC vocoder is presented which splits the LPC excitation into two frequency...

An LPC vocoder of CADM of residual random components

Low Power March Memory Test Algorithm for Static Random Access Memories (TECHNICAL NOTE)

Memories are most important building blocks in many digital systems. As the Integrated Circuits requirements are growing, the test circuitry must grow as well. There is a need for more efficient test techniques with low power and high speed. Many Memory Built in Self-Test techniques have been proposed to test memories. Compared with combinational and sequential circuits memory testing utilizes ...

Demonstration and Modeling of Multi-Bit Resistance Random Access Memory

Although intermediates resistance states are common in resistance random access memory (RRAM), two-way switching among them has not been demonstrated. Using a nanometallic bipolar RRAM, we have illustrated a general scheme for writing/rewriting multi-bit memory using voltage pulses. Stability conditions for accessing intermediate states have also been determined in terms of a state distribution...

Effects of Variable Bit Rate Vocoder on VoIP QoS

Transmission of voice over packet switched networks, such as the Internet (VoIP), has been gradually evolving due to the advantages it can provide to the different end-users (private user, integrated networks service providers, business arena, etc). However, in order for VoIP to be commonly used, the Quality of Service (QoS) offered by VoIP needs to be at least as high as the traditional Plain ...