Albert W. Kovalick

Waveform synthesis using multiplexed parallel synthesizers

A novel signal synthesizer provides high frequency synthesized waveforms for the user. By converting phase information into digital outputs in parallel and by selectively coupling these digital outputs, an ordered digital output is formed to provide the high frequency waveforms. This ordered digital output, which represents points on a sine function, is converted to an analog signal for the synthesizer output. Furthermore, frequency and phase modulations of the synthesized waveforms are easily implemented with this novel signal synthesizer; the modulation information is simply added to the digital outputs prior to selectively coupling. Thus when the ordered digital output is converted to an analog signal, the analog signal contains the modulation information.

Automatically assessing MPEG coding fidelity

As the market and number of products for multimedia applications grow, the need for testing methods and fidelity metrics becomes critical. Testing devices are important for the development and evaluation of multimedia products. This article describes a testing method and prototype that can be used for assessing MPEG coding fidelity.