2. Introduction
FM synthesis is a very efficient, though not always easily
controlled technique for generating interesting sounds. A
small number of parameters can be varied to produce a wide
range of sound timbres. In general, FM parameter matching
for systematic reconstruction of an arbitrary musical
instrument tone has remained an open question. However, a
number of ad hoc techniques have been introduced and will
be re-viewed here.
4. Radio reception relies on antennas for the collection of
electromagnetic fields carrying information, and receiver
elements for demodulation and retrieval of the transmitted
information. Here, we demonstrate an atom-based receiver
for AM and FM microwave communication with a 3 dB
bandwidth in the baseband of ~100 kHz that provides
optical circuit-free field pickup, multiband carrier capability,
and inherently high field sensitivity.
6. Edwin H. Armstrong, known as one of the founding
fathers of radio technology, invented the
superheterodyne radio receiver in 1918 and
frequency modulation (FM) in 1933 [1]. These two
concepts, along with his regenerative circuit
technique developed in 1912, formed the basis of
radio frequency electronics as we know it today.
7.
8.
9. FM
is a method of radio broadcasting that
uses frequency modulation(FM) of the
radio broadcast carrier wave. Invented in
1933 by American engineer Edwin
Armstrong, wide-band FM is used
worldwideto transmit high-fidelity sound
over broadcast radio
AM
is radio broadcasting using amplitude
modulation (AM) transmissions. It was the first
method developed for making audio radio
transmissions,and is still used worldwide,
primarily for medium wave (also known as "AM
band") transmissions,but also on
the longwave and shortwave radio bands.
