Joy and sorrow, excitement and disappointment, love and fear, attraction and repulsion, hope and dismay all these and many more are feelings that human beings often experience in the course of day. Life would be dreary without such feelings. They add color and spice to living. We perceive emotions in others from many sources. The voice is one of the channels of emotional expression. Direct observation using recording instruments has given scientists a great deal of information about the bodily events in emotion. Psycophysiologist who study such events are able to measure the heart rate, blood pressure, breathing rate and depth and many other bodily conditions in emotion. To identify emotions in human behavior from recording of speech samples at various instance of time. Internalizing disorder is said to be depression, and experience loss of interest in activities including social activities, work and life. Sound is an effective parameter for expression and identification of emotions. There is every possibility of manipulation of voice intentionally by an individual. But in case of spontaneous situation, the probability of manipulation is quite less.
