pulse modulation

n. A system of modulation in which pulses are altered and controlled in order to represent the message to be communicated.

pulse modulation

n 1. (Electronics) a type of modulation in which a train of pulses is used as the carrier wave, one or more of its parameters, such as amplitude, being modulated or modified in order to carry information 2. (Electronics) the modulation of a continuous carrier wave by means of pulses

Thesaurus

Noun

pulse modulation - modulation that imposes a signal on a train of pulsesmodulation - (electronics) the transmission of a signal by using it to vary a carrier wave; changing the carrier's amplitude or frequency or phasepulse-time modulation - modulation of the time between successive pulses

pulse modulation

[′pəls ‚mäj·ə‚lā·shən] (communications) A system of modulation in which the amplitude, duration, position, or mere presence of discrete pulses may be so controlled as to represent the message to be communicated.

Pulse Modulation

modulation of oscillations, as a result of which harmonic oscillations take on the shape of short-duration radio pulses, whose properties are determined by the shape of the modulating video pulses.

Pulse modulation is used in radar, where the distance to target is determined from the time of arrival of a pulse reflected by the target, and in systems of pulse radio communications. In this case the transmitted signal (video pulse) can change various parameters of the initial sequence of radio pulses: the height (pulse amplitude modulation); displacement of the pulse in time, without affecting its duration (pulse position modulation); or duration (width) of the pulse (pulse width modulation). In the case of pulse code modulation the transmission of differently coded pulse trains is used for various types of signals.

The pulses used in pulse modulation are mainly square or bell-shaped and have a duration of 10⁻⁹ to 10⁻⁵ sec. The off-on time ratio (the ratio of the repetition period and the duration of a pulse) ranges from 10² to 10³ for radar to several units for multichannel radio communications. Pulse modulation is usually achieved by means of pulse modulators.

REFERENCES

Itskhoki, Ia. S. Impul’snye ustroistva. Moscow, 1959.
Meerovich, L. A., and L.G. Zelichenko. Impul’snaia tekhnika. Moscow, 1953.
Evtianov, S.I. Radioperedaiushchie ustroistva. Moscow, 1950.

pulse modulation

A number of methods of converting CW (carrier wave) signals into digital pulses to reduce the bandwidth required, eliminate errors, and, where possible, improve the signal-to-noise ratio.

pulse modulation

pulse modulation

pulse modulation

pulse modulation

pulse modulation

Pulse Modulation

REFERENCES

pulse modulation

pulse modulation

Words related to pulse modulation

noun modulation that imposes a signal on a train of pulses

Related Words