No.
The design of the engine intake and exhaust can do a lot to reduce noise levels.
noise reducing from signal by some method?
yes
noise insullation in walls help to reduce the noise and also triple glazing
noting
they are made of egg foam which muffles noise
thermal noise willbe reduce
To reduce the noise of chatter at hotels, someone could ask the owner of the hostel to speak to the people making the noise. Also, the person who doesn't like the noise could buy some headphones or earplugs to limit the noise they hear.
noise insullation in walls help to reduce the noise and also triple glazing
its to reduce noise
Put a different muffler on.