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With the laser bounce device the conversations in a room can be picked up outside of the building and the device does not need to be in the room There is a difference between soundproofing and acoustical conditioning Acoustical conditioning is used to control reverberation in a room Soundproofing on the other hand, is designed to keep sound out or in a room Keeping sound in is important to controlling the sensitive information that will discussed in the room For sound to travel there must be air movement and a vacuum cannot transmit sound Air transmits sound effectively over large bandwidths of frequencies because of its low mass This catch-air is not as effective at moving sound at high frequencies There are two issues when considering soundproofing: 1 At high frequencies is not a problem but is a problem at low frequencies 2 There must a medium to transmit sound from one area to another unless there is continuous transmission from one area to another In rooms the transmission of sound from one room to another is usually done by the construction materials of the walls For example, wood and drywall are good conductors of sound and will transmit any conversations and other sounds through the walls Try this little experiment to see for yourself how sound can travel through the walls Place your ear up against the wall in an apartment or hotel room and listen You will probably hear the TV, radio, and some conversations Sometimes if the people next door in a hotel room are loud, you can hear the entire conversation as clearly as if you where sitting in the room with them So it is no surprise that the wall construction materials, wood and drywall, transmit the sound waves extremely well

@interface CurveView : NSView { NSRect myBounds; CGFloat cp1X; CGFloat cp1Y; CGFloat cp2X; CGFloat cp2Y; BOOL draggingCp1; BOOL draggingCp2; }

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Now let s add some methods to the @implementation section of CurveView.m, in order to start intercepting the mouse activity we want to watch. The first method, mouseDown:, will be called whenever a user clicks in our view:

- (void)mouseDown:(NSEvent *)theEvent { // get current mouse location, convert to our coordinate space // (the one expresed by our bounds) NSPoint mouseLocation = [theEvent locationInWindow]; NSPoint convertedLocation = [self convertPoint:mouseLocation fromView:nil]; // see if the click was on one of our control knobs NSPoint cp1 = NSMakePoint(cp1X, cp1Y); NSPoint cp2 = NSMakePoint(cp2X, cp2Y); if (pointsWithinDistance(cp1, convertedLocation, CP_RADIUS)) { draggingCp1 = YES; } else if (pointsWithinDistance(cp2, convertedLocation, CP_RADIUS)){ draggingCp2 = YES; } [self setNeedsDisplay:YES]; }

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Floors are also an issue when it comes to transmitting sound The floor carries a great deal of sound waves or energy There is no to keep it out once the sound waves enter the room or building Now let s turn to the task at hand, the requirements for soundproofing a room First it is important to note that 100% room soundproofing cannot be achieved To soundproof the walls it is best to have two walls with an intervening space that is filled with a fibrous material which will help deaden the sound and not permit the sound to travel between the rooms Care must be taken to make sure that there are no holes, no matter how small, in the either wall structure into the intervening space because the sound waves will travel through the opening defeating the purpose of the specially constructed walls The ceiling and floors will need to be built with the same goal in mind That is to have an intervening space filled with fibrous material to deaden the sound The fibrous material in the floor, walls, and ceiling spaces will help minimize the amount of vibration that rigid structures have because the sound will cause these stiff structures to vibrate and the dampening material will help minimize this problem The more layers that are used will require different dampening materials since each one has its own vibration frequency known as resonant frequency Lead is another substance used to prevent vibration Lead is so dense that it does not vibrate however lead is very expensive and, with environmental regulations around lead, it is probably not a feasible alternative to the fibrous material as a dampening material For the fibrous material to be effective it needs to fill the space between the two walls Concrete can also be used to fill the space between the walls Concrete does transmit sound from one wall structure to the other because of its density Make sure that there are not any leaks for sound to pass from one wall through the concrete to the other wall or the concrete fill will be useless Before you decide to use concrete as a fill material for soundproofing material make sure that the floor and walls can carry the extra load For example, if the room is on a higher floor than the first or if the first floor sits on the slab and there is not a basement under the first floor A civil engineer can do the calculations required to ensure that the floor can take the extra loading safely and will not fail under the load We have discussed soundproofing the walls, floors and ceilings of a room Below is a summary of the information: 1 Wall, ceiling and some times floor plates (floors made from concrete will not transmit sound); structural materials will vibrate sound from one location (room) to another Drywall and wood vibrate readily and transmit sounds easily 2 To eliminate the issues of two walls, ceiling, and floor plates, from coming in contact with one other from different rooms, a space can be placed between the walls, ceilings and floor plates The space needs to be filled with a fibrous.

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