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India - Member - New Member Engineering Fields - Electromechanical Engineering - New Member

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How to Reduce TV Noise?

05/12/2007 11:21 PM

Friends......... I am a btech(ii) electronics student at iiit jabalpur(india)....we had a problem in our hostel i.e. Common room(tv room) is close to the dorms......as there is a passage between the tv room and the dorms...... So i was thinking if we can have some device which can stop(reduce) the tv noise that comes out side.....guys i have taken this up as my summer project to make some device for this years vacation......can anybody suggest me something.........on how to start.............................???????????

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Guru
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#1

Re: IS IT POSSIBLE TO REDUCE(COUNTER) NOISE CREATED BY TV SET BY SOME DEVICE

05/12/2007 11:56 PM

Well, as this seems to be a personal project, I guess it doesn't count as homework.

There are a number of solutions to that problem.

  • Put a heavy drape or curtain over the entranceway to the TV room. Simple and cheap.
  • Install a multiple-output earphone amplifier and have everyone watch TV in total silence. Maybe you could get those wireless types to eliminate the wires. Cost depends on the number of earphones but they're cheap anyway.
  • Use active noise cancellation. There's a previous thread that contains this subject (Controlling Noise Pollution). Cost depends on how sophisticated it is. Effectiveness depends on the layout of the room and hallway.

Off topic: Please refrain from typing in ALL CAPS. It's difficult to read and some consider it to be rude. Just friendly advice.

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#5
In reply to #1

Re: IS IT POSSIBLE TO REDUCE(COUNTER) NOISE CREATED BY TV SET BY SOME DEVICE

05/13/2007 11:44 PM

replace the room

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Guru
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#2

Re: How to Reduce TV Noise?

05/13/2007 5:43 PM

The headsets is a great idea but i foresee trouble when somebody is moving around in the room. Here is a possible refinement.

The output of the speaker must be fed into a coil of a few loops hidden in the picture rail or up against the ceiling . (The impedance must be matched.)

each headset must then be fitted with a coil.

An alternative may be to use Bluetooth, infra red etc earpieces.

Or what about a radio receiver to tune in on the TV audio.

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Guru
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#9
In reply to #2

Re: How to Reduce TV Noise?

05/14/2007 1:00 AM

Hmm...

The coil idea I've never heard of but I think it's worth a try. The range might be an issue but several coils spread about the room might work.

What about those personal FM tuners that's about as big as a flashdisk or cellphone? You could hook up the TV audio output to an FM transmitter (lots of those around) and everyone could just tune in to the right frequency. Of course, everyone has to have one in order to listen to the TV.

Tough luck on those who don't have them coz I'm gonna recommend the removal the speakers on the TV .

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Guru
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#3

Re: How to Reduce TV Noise?

05/13/2007 5:53 PM

For instant piece and tranquility. Design and fit a remote controlled mains circuit breaker.

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Anonymous Poster
#4

Re: How to Reduce TV Noise?

05/13/2007 6:55 PM

The basic electronic noise cancellation/reduction device is a simple inverter. You could try using a microphone (with a long cord)to run the sound of the TV room into a stero so that it feeds back through the speakers. At this point it will be a direct amplification so you will need to insert an inverter in between the speaker and stero. Use your electronic books for information on a basic transitor inverter (a decent electronics textbook should have this info). with the speaker in the corridor and the microphone in the TV room you should be able to feed an invers signal to the speaker and cancel out the tv room noise. If you can use variable resistors on such so you can tweak the inverter if needed.

Vulcan's ideas are good too

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Guru
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#7
In reply to #4

Re: How to Reduce TV Noise?

05/14/2007 12:51 AM

I'll give you a tip...you don't need inverters!

We built one of those noise cancellation things with just the microphone, amplifier and speaker, just standard ones you could buy at any electronics hobby shop. To invert the signal, we just reversed the connections on the speakers. It works!

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Guru

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#14
In reply to #7

Re: How to Reduce TV Noise?

05/14/2007 6:47 PM

This is only true if they face each other.

Both facing the same direction, or away from each other, will only result with a mild phase-shift.

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Guru
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#6

Re: How to Reduce TV Noise?

05/13/2007 11:46 PM

Easiest solution. Get a remote of the same type as the TV, then hit the mute button every time the TV gets too loud. Of course, once everyone figures out why the TV keeps going mute, and who is doing this, it's also gonna make you the most unpopular guy in the block. Seriously, instead of using a costly electronic solution, you could try hanging thick blankets or wall carpetting to muffle the noise. Lining your walls with corkboard would also help reduce noise greatly.

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Commentator
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#8
In reply to #6

Re: How to Reduce TV Noise?

05/14/2007 12:57 AM

Wear Ear Muffs

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Anonymous Poster
#10

Re: How to Reduce TV Noise?

05/14/2007 1:19 AM

You didn't say much about the television...whether it has speaker/aux/phone outputs...that could be connected to amp/audio output unit...thence to multiple, smaller speakers...placed round the room...closer to ears in the audience...and at reduced volume...so the sound volume level is enough to be heard, but not outside the tv viewing room. Standard stuff, really, but not so complicated...no uncertainty (as with other recommendations) as to result...no problems getting fm audio xmitters to tune correctly...no one harnessed to phones...quick and simple...and adjustable/tunable for best result. Room acoustics could also be modified to make it less live...especially the wall behind the tv speaker(s). (Or anything else to get the viewing room to stop acting as an amplifier.) Also, that hallway to the dorm could be fitted with deflective or absorptive material...things you will probably easily find on hand. A sound absorbing (as in, say, canvas covered). free-standing partition set inside the dorm in front of the TV passage door (you'd need to walk around it to enter or exit the passageway) would catch any residual sound entering the dorm. Best solution almost certainly avoids anything to too techy. Think of it as an acoustics problem, not an electronics problem, and you can't go wrong.

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#11

Re: How to Reduce TV Noise?

05/14/2007 6:55 AM

When I lived with my parents my dad snored like a truck downshifting on the highway. I took the foam disposable ear plugs for noise reduction, cut one in half and put each half in one ear. This way they don't protrude and they reduce sound greatly; after this I slept like a log. Might take some getting used to, however when you are really tired you can sleep anywhere.

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Anonymous Poster
#12

Re: How to Reduce TV Noise?

05/14/2007 8:05 AM

Every TV comes with a built in noise reducer. It is called a "power switch". Turn it off and the noise is instantly eliminated...

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#16
In reply to #12

Re: How to Reduce TV Noise?

05/15/2007 5:54 AM

Been waiting all thread for someone to state the obvious.

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Anonymous Poster
#13

Re: How to Reduce TV Noise?

05/14/2007 12:33 PM

We had a similar problem back in my dorm days. We placed a heavy felt curtain 3 feet from the door inside the Day Room (TV room). It extended from the ceiling to the floor and 3 feet beyond the left/right edges of the door. Worked great.

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Guru

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#15

Re: How to Reduce TV Noise?

05/14/2007 6:58 PM

The story goes, that this neighbor, had a loud radio playing all-day-long. Loud enough to annoy the whole neighborhood. Now, it was in the fifties.

Then, one day, someone bought an brand new electric shaver.

Plugged it in, and a cacophony from hell started. The radio owner got so frustrated, he started to curse his machine, then pleaded with it, then begged it to stop this harsh buzzing noise. Then... Silence!

Happy, the radio owner started his loud radio back, and then, in came the buzz, the cursing, the plea, then the silence again.

Eventually he was convinced that god spoke to him, through the buzz in his radio.

A little more buzzing gaudiness, and the radio played so-so-softly ever since.

Later I found out, it's called "Pavlovian-Conditioning"

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