AC-waveform synthesis with quantum-mechanical accuracy has been attracting many researchers, especially metrologists in national metrology institutes, not only for its scientific interest but its potential benefit to industries. We describe the current status at National Metrology Institute of Japan of development of a Josephson arbitrary waveform synthesizer based on programmable and pulse-dri...

This paper is an initial investigation into using knowledge-based parameters in the field of statistical parametric speech synthesis (SPSS). Utilizing the types of speech parameters used in the Klatt Formant Synthesizer we present automatic techniques for deriving such parameters from a speech database and building a statistical parametric speech synthesizer from these derived parameters. Altho...

T his series of articles continues with an analysis of PLL synthesizer design trade-offs. The simple single-loop PLL synthesizer approach exhibits various limitations and trade-offs. Thus, achieving a good performance combination (e.g., small step size and low phase noise) usually requires more sophisticated solutions. The common design trade-offs as well as various methods to improve synthesiz...

This thesis studies the level of performance achievable using today's standard IC processes in the integrated RF subcircuits of the modern GSM base station. The thesis concentrates on those circuit functions, i.e. I/Q modulators, variable gain amplifiers and frequency synthesizers, most relevant for integration in the base station environment as pinpointed by studying the receiver/transmitter a...

Bluetooth is a communications standard targeting shortrange wireless communications with data rates of 1Mb/s at 10m distance. To encourage Canadian universities to pursue this commercially promising standard the Canadian Microelectronics Corporation is providing the intellectual property for a Bluetooth SOC Reference Platform. This platform does not currently include an RF transceiver core. Thi...

In this paper, we address the issue of how the perception of disorderness in selected types of speech disorders may be correlated with the abnormal articulatory structure and with the related acoustic properties. As a first step towards this end we have developed an articulatory synthesizer based on frequency-domain simulation of vocal-tract wave propagation. The synthesizer has been implemente...

In the paper, a programmable phase-locked loop (PLL) based ISM band fractional-N frequency synthesizer, commonly used in wireless communication system, is presented. The third order error-feedback Delta-Sigma modulator and high linearity offset phase frequency detector (PFD)/ Charge Pump (CP) are adopted to reduce close-in phase noise due to ∆Σ quantization noise folding. Automatic calibration ...

We assume that the textures in a video scene can be classified into two categories: textures with unimportant subjective details and the remainder. We utilize this assumption for improved video coding using a texture analyzer and a texture synthesizer. The texture analyzer identifies the texture regions with unimportant subjective details and generates coarse masks as well as side information f...

The cores of the ADPLL-based frequency synthesizer are digital controlled oscillator (DCO) and phase frequency detector (PFD). A modified digitally controlled delay element (DCDE) with characteristics of its monotonicity and insensitivity to PVT variations is presented for the DCO design. We also proposed a new PFD architecture that can finish phase and frequency comparison and adjustment in on...

In this paper, PLL are most frequently used for Local Oscillator (LO) signal generation in wireless radio transceivers to down convert the carrier frequency to lower or intermediate frequency . The input reference frequency is 6.4 MHz. The architecture used for the design of Frequency synthesizer was Integer-N architecture. This was designed using 0.25 μm technology. The VCO designed was a CMOS...