Why do we not use AM and FM at the same time to transmit more information?

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Amplitude modulation uses the modulation of the amplitude of a carrier wave to transmit data while leaving the carrier frequency constant, and in the case of FM it's just the other way round.

Why is a modulation of the frequency in an AM signal not used to transmit additional information, e.g. two audio channels or RDS information?

fm am

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asked 5 hours ago

ahemmetter

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Amplitude modulation uses the modulation of the amplitude of a carrier wave to transmit data while leaving the carrier frequency constant, and in the case of FM it's just the other way round.

Why is a modulation of the frequency in an AM signal not used to transmit additional information, e.g. two audio channels or RDS information?

fm am

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asked 5 hours ago

ahemmetter

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up vote
1
down vote

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up vote
1
down vote

favorite

Amplitude modulation uses the modulation of the amplitude of a carrier wave to transmit data while leaving the carrier frequency constant, and in the case of FM it's just the other way round.

Why is a modulation of the frequency in an AM signal not used to transmit additional information, e.g. two audio channels or RDS information?

fm am

share|improve this question

asked 5 hours ago

ahemmetter

1084

New contributor

ahemmetter is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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Amplitude modulation uses the modulation of the amplitude of a carrier wave to transmit data while leaving the carrier frequency constant, and in the case of FM it's just the other way round.

Why is a modulation of the frequency in an AM signal not used to transmit additional information, e.g. two audio channels or RDS information?

fm am

fm am

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asked 5 hours ago

ahemmetter

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asked 5 hours ago

ahemmetter

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asked 5 hours ago

ahemmetter

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asked 5 hours ago

ahemmetter

1084

asked 5 hours ago

ahemmetter

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1084

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QAM modulates both the phase (= frequency) and amplitude of the signal.

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answered 4 hours ago

Mike Playle

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1 Answer
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1 Answer
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accepted

QAM modulates both the phase (= frequency) and amplitude of the signal.

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answered 4 hours ago

Mike Playle

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up vote
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accepted

QAM modulates both the phase (= frequency) and amplitude of the signal.

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answered 4 hours ago

Mike Playle

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up vote
3
down vote



accepted

up vote
3
down vote



accepted

QAM modulates both the phase (= frequency) and amplitude of the signal.

share|improve this answer

answered 4 hours ago

Mike Playle

461

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QAM modulates both the phase (= frequency) and amplitude of the signal.

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answered 4 hours ago

Mike Playle

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share|improve this answer

answered 4 hours ago

Mike Playle

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answered 4 hours ago

Mike Playle

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answered 4 hours ago

Mike Playle

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461

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