[Music] [Music] [Music] [Applause] [Applause] [Music] communication from the Latin comunicación one act or fact of communicating as communication of smallpox of a secret of power to intercourse by words letters or messages [Music] in the broadest aspects of communication much work has recently been done to clarify theories and make them workable the era we are entering might well be characterized as an era of communication this film will touch in the most elementary way some aspects of the subject that are of daily concern to all of us here is Claude Shannon's diagram by which almost any communication process can be schematically represented the information source selects the desired message out of a set of possible messages the transmitter changes the message into the signal which is sent over the communications channel to the receiver where it is decoded back into the message and delivered to the destination every such system contains noise noise is a term used in the communications field to designate any outside force which acts on the transmitted signal to vary it from the original in this usage noise does not necessarily mean sound reading is a form of communication where the word is a signal the printed page the transmitter light the channel the eye the receiver hear sound can act as noise and interfere with the message but in some situations like reading on a train where the sound level is normally high it is not the sound that it appears with the communication process as much as the motion and the unpredictable quality of the light source quality of light and motion then becomes noise in radio noise could be static and television noise is often the distortion of the picture through transmitting or receiving in a typewritten message the noise source could be in the quality of the ribbon are the keys and we are all familiar with the carbon copies a keep getting aggressive ly worse if anything acts on the signal so as to bury it in an unpredictable and undesirable way in the communication system it is noise we can consider telegraphy in terms of this same diagram we will use in New York stockbrokers office as the information source and a Los Angeles stockbrokers office as the destination there may exist at the information source just two possible messages buy or sell from these two the message cell is selected then coded by the telegraphic key which is a transmitter and sent over the channel in electrical impulse signals decoded by the receiver back into the message cell and delivered to the destination noise of course is there this time acting electrically it could to start the signal in such a way as to change cell into self but as there are only two possible messages buy and sell there is sufficient redundancy in the spelling of the words that even if it did read self the information would still be clear naturally this example has nothing to do with the stockbrokers office of today because of all organized communication market information is perhaps the most efficiently handled the New York information enters a signal channel in this form and is automatically decoded in Los Angeles in this form but even here we find redundancy counteracting noise the English language is about 1/2 redundant this extra framework helps prevent distortion of the message in the written language or in the spoken language in speech the brain is usually the information source from get the message is selected the message is a thought not the words the vocal mechanism codes the words into vibrations and transmits them as sound across the communications channel which is of course the air the sound of the word is the signal the ear picks up the signal and with The Associated eighth nerve decodes the signal and delivers the message to the destination this time noise could originate in a transmitter or in sound vibrations that disturb the channel or it could be a nervous condition on the part of the receiver and it could change the message from I love you too I hate you how do you combat it one way is through redundancy I love you I love you I love you I love you another is increasing the power of the transmitter this combats noise as does the careful beaming of the signal are duplicating of the message via other signals now let's consider amount of information communicated the message cell contained one bit or unit of information because it was a choice of two possible messages by our cell a choice of two gives one bit of information this is the amount of information that one on/off circuit can handle at one time it can be on or off two bits of information is the amount two circuits can handle there is a choice of four possible conditions on off off on on on or off off three circuits can handle three bits for a choice of eight possibilities for circuits four bits or 16 possibilities five bits 32 possibilities six bits 64 amount of information increases as the logarithm of the number of choices the message I love you to communicate information must also be a choice of other messages because if the information source were so loaded with feelings of love as to be incapable of any other thought then surely by the time the words I love you were spoken no information was communicated at all no information yet previous experiences could make those three words convey great meaning source message transmitter channel message destination you could imagine the message being music and the transmitted signal being tone or it could be applied equally well to writing or to smoke signals or to hand signals but let's take painting as another example of a signal transmitting a coded message [Music] information source mind an experience of painter message his concept of a particular painting transmitter his talent and technique signal the painting itself receiver all the eyes and nervous systems and previous conditionings of those who see the painting destination their minds their emotions their experience now in this case the noise that tends to disrupt the signal can take many forms it can be the quality of the light or the color of the light are the prejudices of the viewer are the idiosyncrasies of the painter but besides noise there are other factors which can keep the information from reaching its destination intact the background and conditioning of the receiving apparatus may so differ from that of the transmitter that it may be impossible for the receiver to pick up the signals without distortion in any communication system the receiver must be able to decode something of what the transmitter coded or no information gets to the destination at all if you speak Chinese to me I must know Chinese to understand your words but even without knowing the Chinese language I can understand much of your feelings through other codes we have in common there are systems of communication where there is no redundancy and no duplication of the message here knowledge of the code is essential in planning one if by land two if by sea the fellow on the opposite shore simply had to know the code but there are also many examples of times when the message has been conceived and the signal sent long in advance of understanding or acceptance of the code employed in the case of Galileo or Socrates it did not in time matter but the receivers of their time were not tuned to receive their signal the ultimate transmission of such a message represents communication of a very complex order other high-level communication occurs in very different areas a wave breaking on a beach brings a world of information about events far out at sea the can tell of winds and storms the distance and the intensity it can locate reefs and islands and many things if you know the cold [Music] [Music] [Music] when we watch them turning and wheeling how often have we wondered what holds such birds together in their flight communication is that which links any organism together it is communication that keeps a society together and though these people seem unaware of each other's existence neither looking or speaking one group meets and filters through the other with hardly two individuals coming in contact so constant is the flow of information and so complex the web of communication that keeps them apart and holds them together the symbol the abstracting of an idea communication at once anonymous and personal personal because of the countless individuals that created its farm each one who in his turn added something good or who took something bad away anonymous because of the numbers of individuals involved and because of their consistent attitude these are examples of communication of an idea through symbols but there can also be communication through symbols to an idea as in the burnt offering or in the flame of the candle [Music] [Music] the use of flame as a transmitter in the communications channel is probably as old as man's first fire it stands for all the wonder and mystery of forces beyond man's knowledge the storm warning flags are part of a long evolutionary tradition of signals but their beginnings for probably in basic reactions to color and form basic enough to make their communications carry beyond the barriers of language and custom [Applause] [Laughter] [Applause] [Laughter] [Applause] but symbols also change and evolve some methods of transmitting messages rapidly become symbols then pass into obscurity to become readable only to the anthropologist while other symbols of communication remain the message being transmitted here may be unlimited at the range and the subtlety of its ideas yet the method and the signal are such that they must be fed to the transmitter in a series of positive decisions the system calls for the key to be either up or down the code calls for a dot or a dash the current flows it ceases to flow it flows it is black or white it is stopped or go on or off one or none go or no go or black or white as in this small area from a halftone reproduction in a magazine the press that printed it is capable of printing but one color of ink at a time in this case black ink on white paper in order to transmit the image it had to be broken down to many points of decision black or white we know that such a limitation is not at all restricting if enough decisions are made in this case half a million decided points give fair rendition a million would be better conventional printing of color is no different except that with the added factor of color four times the number of decisions had to be made one set in yellow one in red in blue and in black whenever added factors in a problem are recognized the number of decisions necessary for the solution grows by large leaps as theories and equipment and men develop it becomes apparent that one sure way of handling multiple factors is to build a system that can handle each decision in its time men have long known the theory on which complex problems of many factors can be solved but the number of decisions the calculations necessary were four digits and not until the recent development of the electronic calculator could these areas be touched the problem became one of communication between man and machine between machine and machine between machine and man the cards are punched or not punched light passes or stops and by this binary system information is fed the machine in a moment we will hear sounds which are an actual product of a huge calculator the frequencies are made audible to check its functioning and in a way feel it's pulse here it is [Music] [Music] the ability of these machines to store information manipulate sort and deliver it is fantastic and with their complex feedback systems their memories they're almost human reactions to situations it is understandable that they are popularly referred to as brains the greatest fallacy in the comparison is one of degree the decisions made by the machines are comparable in number to the half-million in this halftone but far greater is the number of stops and goals performed by the human nervous system in order to complete the simplest act so great that if each decision were represented by a small halftone dot the total area of dots would cover several earths such as the magnitude we reach when a number like a half million is raised to the fourth power as flowing as the human movements may seem they are actually the product of these countless yes no decisions communicated with great speed to and from all parts of the body the channel is the nervous system each nerve is made up of hundreds of fibers the decision is the impulse of a single nerve fiber an all-out event a trigger process which is set off like an explosion when the stimulus exceeds the ignition point the dot and the halftone the hole in the tape each is a separate fire no fire signal but together they add up to a smooth sometimes incredibly complex action that often seems more vague than decisive yet many things which we accept as undecided vagaries would be if we could bring our focus in sharp decisive individual units it is a responsibility of selecting and relating parts that makes possible a whole which itself has unity [Music] the line on which each color breaks and the point at which each dot that makes up this painting is placed affects the whole canvas the communication of the total message contains the responsibility of innumerable decisions made again and again always checking with a total concept through a constant feedback system [Music] these elements of a communication system act together as one great tool and though the tool may perform a most complex task it can never relieve the man of his responsibilities no matter where it occurs no matter what the technique communication means the responsibility of decision all the way down the line [Music] [Music] [Applause] [Music]