DSP (digital signal processing)

(DSP) deals with commonly signals such as speech, music, video, EKG or

ECG (heart), and EEG (brain).

Applications of DSP

Signal transmission /storage/retrieval Information extraction

Speech coding , music coding, data compression

communication over noisy channels

Radar and sonar signal processing

Speech ,image and character recognition

Preparing the analog signal for communication through a communication channel

Analyzing the analog signal for use in a voice recognition telephone system.

DSP block diagram

SIGNALS, SYSTEMS, AND SIGNAL PROCESSINGA signal is defined as any physical quantity that vary with time or any independent variablesA system may also be defined as a physical device that performs an operation on a signalA Signal processing is the operations that performed on the signal means processed the signal.

Classification of signals:-

• Multi channel and multi dimension signals• Continuous Time versus Discrete Time Signal• Continuous – Valued versus Discrete – Valued

Signals• Deterministic signal and Random signal

Analog-To-Digital convertor

• Sampler• Quantization• Coding.

Sampler Quantizes Codes

Discrete time signal Digital signal

Quantized signal Analog signal

Sampling of analog signal

This is the conversion of a continuous-time signal into

discrete-time signal obtained by taking samples of the

continuous-time signal at discrete-time instant

The sampling theorem introduced by Nyquist and later by Shannon is used to determine the appropriate sampling rate

Fs≥2Fmax