A(m)/A(c)=0.5 is known as 50% modulation index. where, A(m)=amplitude of message signal A(c)=amplitude of carrier signal
AM: amplitude modulation
Americum; Amplitude Modulation; Ante Meridiem...
It is a way to see differentences between items. Like: Cow is to barn as elephant is to zoo.
AM is already an acronym for "amplitude modulation", a system where a radio wave carries a signal by varying the amplitude of the wave. It is opposed to FM or "frequency modulation" where the signal is carried by variations in the wave's frequency. AM should not be confused with the acronym am which stands for "ante meridionem", a Latin phrase meaning "before noon".
In amplitude modulation, modulation depth refers to the ratio of the unmodulated carrier amplitude to the amplitude deviation for which the modulated carrier wave reaches its minimum value. If this minimum value is zero, the modulation depth is 100%.For amplitude modulation,modulation depth = (a-b)/(a+b),wherea is the unmodulated carrier amplitude, andb is the minimum amplitude deviation.The modulation depth ratio is also referred to as the modulation index.
In amplitude modulation, modulation depth refers to the ratio of the unmodulated carrier amplitude to the amplitude deviation for which the modulated carrier wave reaches its minimum value. If this minimum value is zero, the modulation depth is 100%.For amplitude modulation,modulation depth = (a-b)/(a+b),wherea is the unmodulated carrier amplitude, andb is the minimum amplitude deviation.The modulation depth ratio is also referred to as the modulation index.
AM - Amplitude Modulation FM - Frequency Modulation
QAM is a combination of phase modulation & amplitude modulation.
A(m)/A(c)=0.5 is known as 50% modulation index. where, A(m)=amplitude of message signal A(c)=amplitude of carrier signal
amplitude modulation is where we modulate our signal with a carrier signal amplitude changes but frequency remains constant in amplitude modulation
Frequency modulation have some advantages over amplitude modulation, FM is not sensitive to the amplitude noise, and have high efficient use of transmitted power
Normal frequency range for amplitude modulation is 550kHz to 1610kHz
The operator and transmitter engineer control the modulation level. It can be adjusted so that audio peaks produce 100% modulation, or less than 100%, or more than 100%. More than 100% produces audio distortion in the receiver, and it also 'splatters' across a wider part of the AM dial then it should. It sounds terrible on the radio, and it potentially interferes with other stations.
The range of modulation index in amplitude modulation (AM) is typically between 0 and 1. A modulation index of 0 indicates no modulation, while a modulation index of 1 represents full modulation where the carrier signal amplitude varies from zero to peak value.
Amplitude modulation is a method of sending information by modifying the intensity of a carrier wave.
the maximum amplitude of carrier wave varied with respect to instantaneous values of message signal is called amplitude modulation