The limited audio bandwidth of narrowband telephone speech degrades the speech quality. This paper proposes a method that extends the bandwidth of telephone speech to the frequency range 0–300 Hz. The lowest harmonics of voiced speech are generated using sinusoidal synthesis. The energy in the extension band is estimated from spectral features using a Gaussian mixture model. The amplitudes and ...

Abstract An important step in today’s modern precision crop production systems is the development of an irrigation system for arable lands. Most these only examine top, 10 cm layer soil. The problem that root crops also penetrates and grows into deeper layers while absorbing water. For this reason, there a need cost-effective solution to quantify amount water up 1 meter depth. Sentek EnviroSCAN...