XinuPhone - Revision history

Kpersohn: /* Instructional Resources */

2012-06-05T23:32:12Z

Instructional Resources

Kpersohn: /* Future Work */

2012-06-05T23:31:37Z

Future Work

Kpersohn: /* Downloads */

2012-06-05T23:17:41Z

Downloads

Kpersohn: /* Downloads */

2012-06-05T23:15:08Z

Downloads

Kpersohn at 23:07, 12 July 2011

2011-07-12T23:07:58Z

Kpersohn: /* Hardware */

2011-07-12T22:55:33Z

Hardware

Kpersohn: /* Software */

2011-02-24T21:01:17Z

Software

Kpersohn: /* Software */

2011-02-24T21:00:31Z

Software

Kpersohn: /* Software */

2011-02-24T20:54:24Z

Software

Kpersohn: /* External Links */

2011-02-24T20:14:19Z

External Links

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 == Instructional Resources ==
 * Interactive Real-Time Embedded Systems Education Infused with Applied Internet Telephony. Kyle Persohn, Dennis Brylow. COMPSAC 2011: Proceedings of 35th IEEE Computer Software and Applications Conference, pages 199-204, Munich, Germany, July 2011. [http://dx.doi.org/10.1109/COMPSAC.2011.33 link]
-* [http://xinu.mscs.mu.edu/Teaching_With_Xinu Teaching With Xinu]
+* [[Teaching With Xinu]]
 == Future Work ==

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+|
 |}
 == Future Work ==

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 | style="text-align:center" | [http://www.mscs.mu.edu/~kpersohn/xinuphone/xinuphone.pdf pdf]
 | a0f07d543f2b85440c31daa7d530066f682a8a5a
 |}

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 | a0f07d543f2b85440c31daa7d530066f682a8a5a
 |}
 == Future Work ==

@@ Line 27: / Line 27: @@
 * For capacitors in the audio path, temperature coefficient X7R, NP0, C0G, or better are recommended.
-==Software==
+== Downloads ==
-The audio module firmware is developed in Microchip's freely available MPLAB integrated development environment (shown below).
+{|cellpadding="2"
-The source for various components is available [http://www.mscs.mu.edu/~kpersohn/xinuphone/xinuphone-0.9-src.tar.gz here].
+== Future Work ==
-The networking code is integrated into the Embedded Xinu operating system is packaged in with the general release available [http://www.mscs.mu.edu/~brylow/xinu/ here].
+== External Links ==
+Some additional resources you may find useful
-==Getting Started==
+==== Microchip ====
 * [http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en532310 dsPIC33FJ64GP802 Product Home]
 * [http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1406&dDocName=en019469&part=SW007002  MPLAB IDE]
 * [http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=2660&param=en535144 Audio & Speech Application Libraries]
-====Standards & RFCs====
+==== Standards & RFCs ====
 * [http://www.itu.int/net/itu-t/sigdb/genaudio/Pseries.htm ITU-T Test Signals for Telecommunication Systems]
 * [http://www.itu.int/rec/T-REC-G.711/en ITU-T G.711 - Pulse Code Modulation (PCM) of Voice Frequencies]
 * [http://www.ietf.org/rfc/rfc3550.txt RFC 3550 - RTP: A Transport Protocol for Real-Time Applications]
-====PCB Fabrication====
+==== PCB Fabrication ====
 * [http://www.4pcb.com Advanced Circuits]
 * [http://www.cadsoftusa.com/ CadSoft EAGLE Schematic Capture & Board Layout Software]
 * [http://www.sparkfun.com/tutorials SparkFun Tutorials]

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 The XinuPhone audio module consists of filters, a digital signal controller (DSC), an audio amplifier, and a serial transceiver. Speech first passes through an analog low-pass anti-aliasing filter before it enters the analog to digital converter (ADC) on the DSC.  The DSC can be programed with a variety of software [http://en.wikipedia.org/wiki/Codec CODECs] that compress the sampled audio for efficient transmission across the serial bus. The serial transceiver allows the audio module to interface directly with an RS-232 capable network device, such as a slightly modified Linksys WRT54GL router. The audio module sends serial samples to the network device; then, the Embedded Xinu operating system [http://en.wikipedia.org/wiki/Voice_over_IP VoIP] tools packetize the serial data and send the voice packets to a remote host. On the receiving end, another network device buffers incoming packets and translates the payloads back into a stream of serial data. The external audio module uses the same CODECs to uncompress the serial data back into raw audio samples. Lastly, a digital to analog converter (DAC) on-board the DSC converts the audio samples back to an analog waveform that can be amplified and played back.
-==Hardware==
+== Hardware ==
 ==Software==

@@ Line 11: / Line 11: @@
 ==Software==
-The firmware to run on the audio module is developed in Microchip's freely available MPLAB integrated development environment (shown below).
+The audio module firmware is developed in Microchip's freely available MPLAB integrated development environment (shown below).
 [[File:xinuphone-mplab.png|600px]]

← Older revision		Revision as of 20:54, 24 February 2011
Line 11:		Line 11:

	==Software==		==Software==
		+	[[File:xinuphone-mplab.png\|600px]]

	==Getting Started==		==Getting Started==