III. Applications:



1. Introduction

DSP is now used everywhere, mostly in telecommunication. Why?
· Flexibility and programmability of DSP processors
· The DSPs can now undertake powerful calculations and various management tasks

Examples:
- The telecom is the largest market in DSP applications
- The first application of DSPs is in signalling
- Voice/tone recognition via telephone
- The DSPs are present also in the modems
- Also in the cellular phones, to improve the transmitted speech quality (DSP processor Texas Instrument, 32 bits floating point) or power management
- Public/private network: digital image through satellites
- Etc…



2. Sampling frequency and bits rate: examples


CD player:
· Sampling rate of 44.1kHz
· Number of bits used: 16


Telephone speech:

· Sampling rate: 8kHz
· Bits: 8 to 13


Image processing: up to 32bits.








3. Generic DSP processors and boards

· Processor:

The key features of a DSP processor are fast interrupt response time and fast binary multiplier. The single cycle parallel multiplier is the key distinguishing feature between DSP processors and general processors.




· Main DSP operations:
Multiplication and accumulate, also called MAC


· Classic DSP board:


4. Main manufacturers:


- Motorola
http://www.mot.com/sps/dsp/

- Texas Instrument
http://www.ti-dsp.com
http://www.ti.com/sc/docs/dsps/dsphome.htm

- Analog Devices
http://www.analog.com/industry/dsp/

- Lucent Technologies
http://www.lucent.com/micro/dsp/


All these sites contain useful information on their products, of course: description, featured, data sheets, pricing/availability/samples, application notes, user manuals, related documents, development tools, training, data converters, etc… I will recommend Texas Instrument for its complete information on its products and all the documents you can visualise, or try to download some of its free software solutions/tools.