Macbook Pro is picking up television audio. Any way to stop this?

Just recently moved into a new house and my MacBook has started to pick up a television audio source and it will play through both my speaker setup and my headphones. It is only amplified enough when the charger is plugged in or a minidisplay adapter is plugged in. Is there anyway to stop or fix this? It is becoming quite annoying when listening to music or streaming video on my TV.

Yes, it's noise in the audio channel and Apple used to have a support document on it but it's gone.
Ok, there is a few of ways noise can get into the audio channel.
Say you have speakers hooked up to your Mac, you have the volume of the Mac low and the amplifier of the speakers set high. This will increase the unwanted noise, so instead reverse the situation, increase the volume on the Mac and lower the amplifier.
Another way is if your analog audio cables are too close to other wires carrying a strong signal, the electromagnetic field influences the electrons in the audio cable.
Another way is noise is coming back through your power, modem or cable and either being picked up by your Mac or by your amplifier.
Now it seems because you are hearing phone calls and if it's coming from the Mac speakers, you perhaps need a DSL filter on the line someplace, forget where it's supposed to go as I haven't used a the phone lines in many years.
Did you try that? Do you have any speakers or amplifiers or is the noise coming from the computer?
Ideally, a Toslink stereo mini optical to standard Toslink adapter and cable should be used to connect a Mac to a high quality stereo/surround sound system as optical doesn't get the noise in the audio channel.

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