DSP Facts and Equipment.pdf

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SGC – The SSB People
SGC develops, manufactures, and sells high performance single sideband (SSB)
communications equipment. For more than 25 years, the company has sold to the
marine, military, aviation, and industrial markets world wide. Over these years,
SGC has earned an outstanding reputation for product reliability and for service
after sale.
On the cutting edge of technology, the company keeps pace with equipment
options, engineering developments, and design requirements. Its products are the
most competitive in the entire long distance communication market. SGC equip-
ment is presently being used by the United Nations and international relief agencies
for inter-communications in developing countries throughout the world. Many
competitive racing vessels, as well as fishing boats, tugs, and commercial craft are
equipped with SGc equipment. In fact, an SGC radiotelephone provided the only
communication available on a recent Polar expedition by the National Geographic
Society.
SGC supplies U.S. Government agencies, foreign governmental agencies, and
major petroleum companies throughout Asia and Latin America. In addition, SGC
supplies equipment to major international geophysical corporations and exploration
crews.
All SGC equipment is designed and manufactured in the USA, with some compo-
nents imported for different international suppliers and manufacturers. SGC has
qualified people ready to provide technical information, assistance in selecting
equipment, and recommendations for installations.
SGC welcomes your call to discuss your HF-SSB requirements.
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Digital Signal
Processing
Facts and Equipment
Another
Informative Publication of
SGC, Inc.
Manufacturer of Advanced
Technology
ÑNo Compromise CommunicationsÒ
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Table of Contents
Chapter 1
The idea of Digital Sound Processing
1
Understanding Sound
1
Hearing Sound
2
Frequency
2
Amplitude
3
Storing and Retrieving Sound
3
Storing sound
4
Retrieving sound
4
Transmitting and Receiving Sound by Radio
4
Modulation
5
Sidebands
6
Processing Sound Digitally
7
Recording on Compact Discs
7
Sampling
8
Volume
9
Compression
9
Chapter 2
The Idea of Analog Filtering
10
Analog Filters in Audio
10
Crossover Network
10
Woofers
10
Tweeters.
10
Midrange
10
Cutoff
11
Analog Filters in HF Radio
11
Symmetry
12
Crystal filters
12
i
SGC Inc. SGC Building,13737 S.E. 26th St. Bellevue, WA. 98005 USA
P.O.Box 3526, 98009 Fax: 425-746-6384 or 746-7173 Tel: 425- 746-6310 or 1-800-259-7331
E-mail: SGCMKTG@aol.com Website: http://www.sgcworld.com
¨ 1997 SGC Inc
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Mechanical filters
13
HF filters in practical applications
13
Wide bandpass
13
Medium bandpass
13
Narrow bandpass
13
Chapter 3
DSPs in HF Communications
15
DSP Flow Chart
15
Sample and Hold
16
Analog to Digital
16
DSP
17
Digital to Analog
17
Low-pass filter
17
DSP Evolution
18
DSPs in Transmitting Applications
18
DSPs in Speech Processing
18
DSP in SSB Generation
19
DSP in Phase Delay
19
Out-of-phase signal 19
Phase shifting networks 19
DSP in CW Modulation
20
DSPs in Receiving Applications
20
Standard DSP filters
20
Analog
21
Digital
21
Programming
21
Continuously Variable DSP Filters
22
ii
RF Attenuator
23
¨ 1997 SGC Inc
SGC Inc. SGC Building,13737 S.E. 26th St. Bellevue, WA. 98005 USA
P.O.Box 3526, 98009 Fax: 425-746-6384 or 746-7173 Tel: 425- 746-6310 or 1-800-259 7331
E-mail: SGCMKTG@aol.com Website: http://www.sgcworld.com
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