Cochlear-implant speech processors transmit temporal features of sound as amplitude modulation of constant-rate electrical pulse trains. The present study evaluated the central representation of amplitude modulation in the form of phase-locked firing of neurons in the auditory cortex. Anesthetized pigmented guinea pigs were implanted with cochlear electrode arrays. Stimuli were 254 pulse/s (pps...

The usefulness of pulse Frl.!qucncy Mudulation (PFM) in information transmission is ..:mpasizcd. Biological systems <Jlso usc Pulse Frcqu.:ncy Modulation in Lransmilling informations. An atlcmpl was made for an cx:pcrimcntal test on PFM. Some results of the experimental test show that almost distortion free information recovery, from the frequency modulated pulse train, is possible by low-pass ...

this paper proposes a flexible power electronic transformer (fpet) for the application in the micro-grids. the low frequency transformer is usually used at the point of common coupling (pcc) to connect the low voltage grid and utility network to each other. the conventional 50hz transformer results in enhanced low voltage-grid power management system during grid-connected operation. in this pap...

Abstract For pulse compression characteristics and not easily affected by noise, linear frequency modulation signal are widely used in underwater acoustic communication. This paper analyzes the characteristics of hyperbolic frequency modulation signal over underwater acoustic channels. Compared with linear frequency modulation signal, hyperbolic frequency modulation has the same performance of ...

Ultra-wideband (UWB) uses narrow band pulses of nano-seconds to provide high data rate communications .These narrow pulses spread the energy across a wide frequency band that is why it is called ultra-wideband. In this paper, we will discuss the UWB pulse modulation and multiple access modulation schemes using Pulse Position Modulation technique .The simulations are done in MATLAB software.

The parameters that characterize a rectangular-shaped pulse-modulated sinusoidal signal are the carrier frequency, the pulsewidth, the repetition frequency, and the number of pulses in or the duration of the signal. We use a Fourier series representation to show the influence of these parameters on the spectrum of a pulse-modulated signal at a microwave carrier frequency. When an additional amp...

Temporal modulations in stimulus amplitude are essential for recognizing and categorizing behaviorally relevant acoustic signals such as speech. Despite this behavioral importance, it remains unclear how amplitude modulations (AMs) are represented in the responses of neurons at higher levels of the auditory system. Studies utilizing stimuli with sinusoidal amplitude modulations (SAMs) have demo...

The multilevel inverters have become more popular during the recent years. The multilevel inverters are applied in many industrial applications such as static VAR compensators, AC power supplies, drive systems, active power filters, etc. The topologies of multilevel inverter have several advantages such as low distortion in output voltage with relative low switching frequency, low harmonic and ...