...
The world of science and engineering is filled with signals: images from remote space probes, voltages generated by the heart and brain, radar and sonar echoes, and countless other applications. ... DSP is one of the most powerful technologies that will shape science and engineering in the twenty-first century. ... DSP is the mathematics, the algorithms, and the techniques used to manipulate these signals after they have been converted into a digital form. ... DSP answers the question: What next?
The roots of DSP are in the 1960s and 1970s when digital computers first became available. Computers were expensive during this era, and DSP was limited to only a few critical applications. ... The personal computer revolution of the 1980s and 1990s caused DSP to explode with new applications. Rather than being motivated by military and government needs, DSP was suddenly driven by the commercial marketplace. Anyone who thought they could make money in the rapidly expanding field was suddenly a DSP vendor. DSP reached the public in such products as: mobile telephones, compact disc players, and electronic voice mail. Figure 1-1 illustrates a few of these varied applications. ...
Communication Theory
Numerical Analysis
Probability and Statistics
Analog Signal Processing
Analog Electronics
Digital Electronics
DSP has revolutionized many areas in science and engineering. A few of these diverse applications are shown here.
Applications of DSP
Space
-Space photograph enhancement
-Data compression
-Intelligent sensory analysis by remote space probes
Medical
-Diagnostic imaging (CT, MRI, ultrasound, and others)
-Electrocardiogram analysis
-Medical image storage/retrieval
Commercial
-Image and sound compression for multimedia presentation
-Movie special effects
-Video conference calling
Telephone
-Voice and data compression
-Echo reduction
-Signal multiplexing
-Filtering
Military
-Radar
-Sonar
-Ordnance guidance
-Secure communication
Industrial
-Oil and mineral prospecting
-Process monitoring & control
-Nondestructive testing
-CAD and design tools
Scientific
-Earthquake recording & analysis
-Data acquisition
-Spectral analysis
-Simulation and modeling
Telecommunications
Telecommunications is about transferring information from one location to another. ... DSP has revolutionized the telecommunications industry in many areas: signaling tone generation and detection, frequency band shifting, filtering to remove power line hum, etc. ... In comparison, DSP converts audio signals into a stream of serial digital data. ... Dozens of DSP algorithms have been developed to convert digitized voice signals into data streams that require fewer bits/sec. ...
The highest achievable compression is about 2 kilobits/sec, resulting in sound that is highly distorted, but usable for some applications such as military and undersea communications. ... Correspondingly, much of DSP is related to image and audio processing. ... DSP has made revolutionary changes in both these areas. ... DSP can provide several important functions during mix down, including: filtering, signal addition and subtraction, signal editing, etc. One of the most interesting DSP applications in music preparation is artificial reverberation. ... DSP allows artificial echoes and reverberation to be added during mix down to simulate various ideal listening environments. ... This approach was used in one of the very early DSP success stories, the Speak & Spell, a widely sold electronic learning aid for children. ... While this is adequate for many commercial
applications, these limitations are humbling when compared to the abilities of human hearing. ... While these applications have a common thread, each has its own specific problems and needs. ... DSP has revolutionized radar in three areas, all of which relate to this basic problem. First, DSP can compress the pulse after it is received, providing better distance determination without reducing the operating range. Second, DSP can filter the received signal to decrease the noise. ... Third, DSP enables the rapid selection and generation of different pulse shapes and lengths. ... When it comes to radar, DSP is as much about high-speed hardware design as it is about algorithms. ... DSP has revolutionized sonar in many of the same areas as radar: pulse
generation, pulse compression, and filtering of detected signals. ... To handle these multiple channels, sonar systems require the same massive DSP computing power as radar. ... How did the early geophysicists manage without DSP? ... DSP allows oil to be found in difficult locations, such as under the ocean. ... These special characteristics have made image processing a distinct subgroup within DSP. ... In spite of its obvious success, medical x-ray imaging was limited by four problems until DSP and related techniques came along in the 1970s. ... Thats good DSP! ... DSP plays a key role in all these techniques. ... DSP can improve the quality of images taken under extremely unfavorable conditions in several ways: brightness and contrast adjustment, edge detection, noise reduction, focus adjustment, motion blur reduction, etc.
To link to this page, copy the following code to your site:
All Papers Are For Research And Reference Purposes Only!
You may not turn these papers in as your own! You must cite our web site as your source!
