Digital Signal Processing is very interesting topic in the field of Electronics & Telecommunication Engineering.
Signal processing basically means, the extraction of useful information from available information.The signal is processed by a system & the system could be mechanical system or computer program.
Digital Signal Processing?
DSP manipulates different types of signals with the intention of filtering, measuring, or compressing and producing analog signals.
DSP can be found in almost any field, whether it’s oil processing, sound reproduction, radar and sonar, medical image processing, or telecommunications– essentially any application in which signals are being compressed and reproduced.
The digital signal process takes signals like audio, voice, video, temperature, or pressure that have already been digitized and then manipulates them mathematically. This information can then be represented as discrete time, discrete frequency, or other discrete forms so that the information can be digitally processed. An analog-to-digital converter is needed in the real world to take analog signals (sound, light, pressure, or temperature) and convert them in to a digital form.
Signal Processing - Open Education Resource 