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thebugger
modified 9 years ago

Independent SideBand Modulation

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01:07:28
* This is just a basic representation of the technique, not in any way, the real way to do it. Just an old stereo AM technique that never really got widely accepted due to its few disadvantages, some of which are incompatibility with standard AM receivers. Basically you either have to buy a special receiver or get two receivers, each one demodulating a different sideband. It also had poor stereo separation above 5Khz, with none at 7Khz. There were some stations that used this method, but people rarely had the receivers to utilize it. The technique is pretty simple. Instead of wasting one sideband of the same carrier you also encode it with the other audio channel. Since normal AM receivers suppress the lower sideband, this technique was incompatible with normal receivers.
published 9 years ago
gasboss775
9 years ago
Interesting, Ive heard of Quadrature modulation for AM stereo but not this. Which oscillators are the actual modulation sources?
thebugger
9 years ago
The idea is that you supply both sideband modulators with the same carrier oscillators, to not have any phase shift of the carrier. That's why this topology cannot be exactly used, it's just a representation of how ISB AM works
hurz
9 years ago
@thebugger, i think you do understand the word "sideband" wrong.

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