[Answered] RMT peripheral: What is meant by a "carrier wave"?

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kolban
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[Answered] RMT peripheral: What is meant by a "carrier wave"?

Postby kolban » Fri Jan 20, 2017 11:58 pm

While studying section 7.1 of the ESP32 Technical Reference on the topic of the RMT peripheral, I read the following:
An RMT transmitter does this by reading consecutive duration values for an active and inactive output from the built-in RAM block, optionally modulating it with a carrier wave.
I believe I understand that I can specify the high duration and low duration as a series of record items and supply those to the RMT component and it will produce those on the designated output pin ... but where I am lost is on the concept of a "carrier wave". What does that mean in terms of digital outputs and the ESP32? Does anyone have a description or thought example of how that might work and be used?
Last edited by kolban on Sat Jan 21, 2017 3:34 am, edited 1 time in total.
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