How do the volume controls on a TV work? Is it through some kind of amplitude modification?
Thanks in advance for your answers.
In: Technology
Not sure if the question is: how does the remote talk to the tv? Or how does the tv increase volume?
Remote essentially shoots a low power laser beam at the tv and the laser has information that encode specials signals. This signal is typically encoding as on/off keying (OOK) also known as amplitude shift keying (ASK) (Digital Communications is a good introduction)
The speaker on the tv has an amplifier that controls the speaker volume. Turning the volume up of down controls the voltage level of the speaker through something called a feedback loop. The amplifier itself is at a fixed voltage but the signal wire to the speaker varies in voltage. (Op-Amp or Operational Amplifier is a good introduction)
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