pulse modulation

Research was also performed on frequency control and pulsed modulation.

A voice came from the wall speaker with the eerie wavering of pulse modulation.

Most systems use pulse modulation, with or without other supplementary modulating signals.

To overcome frequency instability of the magnetron, pulse modulation was used.

Moving surfaces cause amplitude, Doppler frequency, and pulse modulation of the return.

Then I recognize the pulse modulation of the beam and accept it within my communications relays.

Young suggested using pulse modulation, with the height possibly determined from the lapsed time between transmitted and received pulses.

Pulse Modulation - In PM, you simply turn the sine wave on and off.

A second 100 kW gyrotron has recently been installed on HSX to perform heat pulse modulation studies.

This could include AM, FM, ΦM (phase modulation) and pulse modulation.

Shield and Pulse Modulation," and a solemn reminder of the consequences of "capricious or selfish use" of any skill taught therein.

It is an analog pulse modulation scheme in which the amplitudes of a train of carrier pulses are varied according to the sample value of the message signal.

A breadboard test unit, operating at 50 cm (600 MHz) and using pulsed modulation, gave successful laboratory results, but was not of interest to War Office officials.

Pulse modulation schemes aim at transferring a narrowband analog signal over an analog baseband channel as a two-level signal by modulating a pulse wave.

By using pulse modulation techniques and a high power infrared diode, one can eliminate interference from ambient light, operate the LED at a higher gain, and lessen the effects of build-up on the probe.

Light from an Argon-Ion laser was passed through the Pockels Cell to create pulse modulations corresponding to the original FM video and audio signals to be recorded on the master videodisc.

More recently, high-end hobby systems using Pulse-code modulation (PCM) features have come on the market that provide a computerized digital bit-stream signal to the receiving device, instead of analog type pulse modulation.

The aim of 'pulse modulation' methods is to transfer a narrowband analog signal, for example a phone call over a wideband baseband channel or, in some of the schemes, as a bit stream over another digital transmission system.

Back at the SCL, he and Robert H. Noyes built an experimental apparatus using a 75 watt, 110 MHz (2.73 m) transmitter with pulse modulation and a receiver patterned on the one at the NRL.

Some pulse modulation schemes also allow the narrowband analog signal to be transferred as a digital signal (i.e. as a quantized discrete-time signal) with a fixed bit rate, which can be transferred over an underlying digital transmission system, for example some line code.

Note that with pulse modulation, the carrier is simply switched on and off in sync with the pulses; the modulating waveform does not actually exist in the transmitted signal and the envelope of the pulse waveform is extracted from the demodulated carrier in the receiver.

Photochemistry and gas exchange" Biochimica et Biophysica Acta 679: 452-465 (1982) 11 J. Kolbowski, H. Reising and U. Schreiber "Computer-controlled pulse modulation system for analysis of photoacoustic signals in the time domain" Photosyn.