LYCOS RETRIEVER 
Amplitude Modulation
built 657 days ago
Since the gears in the gearbox usually rotate at different speeds, the amplitude modulation due to each gear will be at a different rate, and the resulting sidebands will be of different spacing. This allows the diagnosis of gearbox faults narrowed down to specific gears and/or shafts by analyzing the sideband patterns in the vibration spectra.
Source:
A major aim of these experiments was to determine explicitly the effects of manipulating the probability of transmitter release pharmacologically on EPSP amplitude and EPSP amplitude modulation. In 12motoneurons, baclofen was administered iv while the motoneuron penetration was maintained and EPSP amplitude, amplitude modulation, and potentiation were measured during the period of EPSP amplitude decline. An example of this is shown in Fig. 4, A and B. Note that during the 45min over which the motoneuron penetration was maintained, EPSP amplitude decreased from 0.43mV to 0.11mV and EPSP amplitude modulation ratio increased concomitantly from 0.86 to 1.77.In addition, the potentiation ratio decreased from 1.4 to 1.18(16%). Similar data were obtained at all connections studied in this way (Fig. 5).
Source:
This button in the Modulation section of a Stream brings up the Amplitude Modulation dialog. It is shown depressed when AM is activated for this stream. The actual AM toggle button is at the top of the pop-up dialog.
Source:
Manipulation of GABAB receptor activity led to a much steeper change in EPSP amplitude modulation as a function of EPSP amplitude than was observed when these variables were compared across the motoneuron pool. Because the GABAB receptor controls Ca2+ channel activity, manipulation of its activity can be assumed to affect probability of release as confirmed by studies of quantal release variables. Thus the finding that manipulation of probability of release directly results in a much steeper slope for the relationship between EPSP amplitude modulation and EPSP amplitude than what is observed across the motoneuron pool suggests that differences in EPSP amplitude in different motoneurons are not the result of systematic differences in probability of transmitter release. Rather it seems likely in the rat that most of the differences in EPSP amplitude across the motoneuron pool are the result of other factors such as the convergence of afferents, number of boutons per afferent, and motoneuron input resistance.
Source:
Amplitude modulation is utilized in many services such as television, standard broadcasting, aids to navigation, telemetering, radar, facsimile etc. Although the message content may vary widely for these, the mechanism of combining the message and the message carrier at the sending terminal is basically the same.
Source:
The mixture of the three vowels is presented for one second, followed by each of the three vowels in the mixture being amplitude modulated in succession each for one second, while the remaining two vowels are not modulated. The first one second of the waveform should not sound like any particular vowel or speech sound. You should then be able to hear out the three vowels in succession as each is amplitude modulated while the other two are not amplitude modulated. This demonstrates that amplitude modulation is a potential physical variable that could be used by the auditory system to help segregate sound sources in a complex sound field.
Source:
MORE ABOUT
Amplitude Modulation