Queries about some applications

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Discussion Overview

The discussion revolves around applications of digital modulation schemes, specifically in the context of wireless communication devices such as speakers and walkie-talkies. Participants explore tools, projects, and resources related to these applications.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant inquires about practical applications of digital modulation schemes.
  • Another participant lists various modulation schemes including OOK, FSK, ASK, PSK, QAM, and OFDM.
  • A participant seeks specific tools or devices that utilize these modulation schemes, expressing interest in wireless speakers and walkie-talkies.
  • There is a suggestion to consider communication simulators for comparing performance against noise and channel impairments.
  • One participant mentions that some wireless routers use OFDM and that cellphones utilize CDMA and GSM, suggesting RF evaluation kits as potential resources.
  • Another participant recommends looking into Bluetooth development kits and wireless standards for project support.
  • Participants discuss the difficulty in finding circuits and schematics for wireless speakers, with suggestions to search for kits or specific transmitter/receiver chips that may provide sample circuits.
  • One participant shares a Google search link for wireless speaker schematics, indicating that specific search terms can yield useful results.

Areas of Agreement / Disagreement

Participants express a variety of needs and challenges in finding resources related to digital modulation applications, with no clear consensus on specific tools or projects. Multiple viewpoints on how to approach the search for information and resources are present.

Contextual Notes

Participants mention various types of devices and modulation schemes but do not provide detailed specifications or established connections between them. There is uncertainty regarding the effectiveness of different search strategies for finding relevant circuits and schematics.

Who May Find This Useful

This discussion may be useful for individuals interested in wireless communication technologies, digital modulation applications, and those seeking resources for related projects or kits.

sulymani
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Guys

I am inquirin about some applications of any digital modulate schemes ...
 
Engineering news on Phys.org
Digital modulation
OOK · FSK · ASK · PSK · QAM · APSK ·
MSK · CPM · PPM · TCM · OFDM

http://en.wikipedia.org/wiki/Modulation"
 
Last edited by a moderator:
Thanksss budd.. I looked at that link u posted... However, I am looking for a tool that uses anyone of those schemes.
 
sulymani said:
Thanksss budd.. I looked at that link u posted... However, I am looking for a tool that uses anyone of those schemes.

What do you mean by a "tool"? Do you mean some kind of comm simulator? What are you trying to do? Compare performance against different kinds of noise and channel impairments?
 
Well.
berkeman I didn't get what you pointed out to. I might have paraphrased my statement at first wrongly. I meant that what machines for example "wireless speakers" or "walki talki" that use transmitter and receiver or transceiver.I need many options. I addition, how can I research about a project , its kits and schematics like Do u know any websites or any database that provide info about various projects ?

again my appreciation guys for ur inputs.
 
some wireless routers use OFDM. Faster ones have another receiver technique called MIMO, multiple in multiple out in addition to the modulation scheme. Cellphones use CDMA, GSM. they are some rf evaluation kits/boards.
try digikey. hope this helps
 
edmondng said:
some wireless routers use OFDM. Faster ones have another receiver technique called MIMO, multiple in multiple out in addition to the modulation scheme. Cellphones use CDMA, GSM. they are some rf evaluation kits/boards.
try digikey. hope this helps

Ah. I googled bluetooth development kits, and got lots of hits. You should look at some wireless standard, and then look to see what kind of developer support there is. Bluetooth is a good one to start with, because lots of developers and companies are jumping on that bandwagon. Whether it's a good wagon to be jumping on is another issue. But it should serve the purposes of your project. Here's a typical link from that google hit list:

http://www.palowireless.com/database/btdevkits.asp
 
u know guys I've been trying to find some circuits and scematics of wireless speakers, howevr, i couldn't finy any... I don't know i use the wrong words while using search engines.
 
have you look at kits? most of the time kits will have schematics to help you get started. also looking at specific chips like Tx/Rx chips will normally contain some sample circuit on how to use the chip. Then you can build from there
 
  • #10
sulymani said:
u know guys I've been trying to find some circuits and scematics of wireless speakers, howevr, i couldn't finy any... I don't know i use the wrong words while using search engines.

I googled wireless speaker schematic (using those exact words), and got some pretty good hits. Check out the hit list to see if it helps:

http://www.google.com/search?source...4SUNA_en___US232&q=wireless+speaker+schematic
 

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