Life is filled with signals

It sucks ! We never knew that our whole life is filled with a word 'signal' and our life is dependent on the energy of the signal. What we see, what we hear, what we speak and everything in da to day life is a signal. Of course it is hard to correlate our life routines with DSP ('Daily Signal Perception') and somehow our body as a system has been example to many to make a lot of signal based systems. We never realized that there will be someone who will understand our body model itself as a system to simulate the concept of a subject which is called as Digital Signal Processing? True to the fact that most of our DSP systems are inspired by the system that our body is adept to!

Take the very case of HVS which has the ability to distingwish brightness and color. HVS refers to human visual system which has given the idea for entire image processing algorithms. The very basic luminance-chrominance model of image representation and video representation is inspired by our eyes??? And infact it is interesting to know our eye can act as a low pass filter (for who cannot understand this filter bla bla and gyan to put simple - low pass filter is very much same as a coffee filter except that it allows to pass signals of low frequency instead of coffee. Designers often use it to seperate signals which are intermixed like water and milk). Our ear can act as a model for audio perception. Infact all the audio decoders today are based on the human perception system of the ear where the cohlear filters model the cohlea of our ear. Famous standards like MP3 (hmm! you know it as you hear it!) are based on the principle of perceptual model for audio. Our vocal tract is an inspiration for those who wanted to understand the nature of pitch. Observing people of high pitch and low pitch people came up with an interesting representation of human vocal system as a speech model. All practical Digital Signal models for image, video, audio and speech are inspired from what we see, watch, listen and talk.
This is only an interesting point to start with. There is a lot of other gyan that relates the human body with signals and having a real observation of daily life can bring some more interesting facts....