1000 Threads found on edaboard.com: Voice Over Can
You must start by sampling the voice using the ADC in 8KHz smpling frequency
then compress the the voice data into lower size using some algorithm like ADPCM
dived the data into packet and send the packet using the can bus
When you receive the data decompress it and use an D/A converter to convert the data into (...)
Microcontrollers :: 08-24-2005 02:17 :: bobcat1 :: Replies: 5 :: Views: 1208
i need to design a project based on voice over ip and i need some one to help me to find chips i need to start working with this project
thanks for every body need to help
Fire in The Wire :idea:
Digital communication :: 03-28-2006 15:10 :: fireplus :: Replies: 3 :: Views: 1362
Technically, voice over lan is not required to use IP as the underlying protocol. For example, on an ethernet lan you could use fundamental ethernet packets to convey voice data directly without using IP or any other higher level protocols.
As a practical matter though, sinip is correct: IP is the standard for conveying (...)
Network :: 10-18-2006 09:52 :: lambtron :: Replies: 4 :: Views: 1404
Analog voice over VPN?? using cisco routers
What I should takecare & how to ensure good voice comm. Quality?
What the min. bitrate for one voice conversation?
at last does there is a diff between
"VIRTUAL TUNNEL INTERFACE WITH IP SECURITY" & the VPN
or it is the same
Also what is the diff (...)
Network :: 05-15-2007 16:26 :: ahmed osama :: Replies: 1 :: Views: 645
I want to transmit voice over RS232 and replay it in real-time using one of the Mega AVRs.
The problem is the interval between samples.
Since I'm using a computer on one side ,can I rely on the pauses(between transmissions) that I make in the computer program ?
Is it more efficient to use PCM ? If yes please guide me through a source (...)
Embedded Systems and Real-Time OS :: 09-17-2010 06:32 :: elockpicker :: Replies: 0 :: Views: 855
Please introduce ICs that use DSL technology to send data/voice over cables.I need a single chip solution that have the longest cable lenght without repeater and higher data rate.
Professional Hardware and Electronics Design :: 01-09-2004 18:27 :: 7rots51 :: Replies: 0 :: Views: 813
I am tired with this problem ,please help me out here.
I am trying to communicate over can network.
I have two 18F4580
one as Transmitter and another as Receiver.
I am not able to get any data from Trans to Receiver.
Code as follows
list p=18f4580 ;
Microcontrollers :: 10-07-2005 19:30 :: viks :: Replies: 0 :: Views: 861
i just need help to fine best type of modulation technique in my project
my project need to transmit and receive voice over power line full duplex
plz help me to theory of modulation and to fine chips for that
Miscellaneous Engineering :: 12-13-2009 13:54 :: ahmedkamal :: Replies: 0 :: Views: 1174
If you dont need real-time voice transfer, you can record the voice on a PC using any good codec avaialable with the PC. That file can be shared over the LAN or can be avialable on the server for anyone to download.
Hobby Circuits and Small Projects Problems :: 10-19-2005 23:33 :: techie :: Replies: 2 :: Views: 745
do we need to convert the vocie from microphone while sending over the local area networks,means do we need any conversion of the voice from soundcard to LAN
Network :: 11-01-2006 06:28 :: asmat_ali :: Replies: 11 :: Views: 1997
Im a 5th year ECE student. I am working on a project that allows voice communication over powerline (full-duplex) on a small building. can anyone help me whats the best modem to use? I wanted to try Consumer-band BPSK 7.2 kbps PLM PICtail of MICROCHIP and MAX2990 EVKIT of MAXIM.
Electronic Elementary Questions :: 12-25-2012 23:32 :: teotsky :: Replies: 3 :: Views: 910
What you propose has already been done on an experimental basis. voice over IP has been applied to 802.11 systems and there are several commercial systems that use 802.11 for city wide systems. They have nodes around town that connect to the wired internet.
The overall problem is economic and limited frequency. In silicon valley (...)
RF, Microwave, Antennas and Optics :: 02-18-2003 12:56 :: flatulent :: Replies: 2 :: Views: 1127
I want to know how can i deal with cl30(shell program) because this program didn't run in DOS or WINDOWS. so i want your help to run this
aslo if you know how what is the operation (function) of DSP in project like
VOIP(voice over IP)
Digital Signal Processing :: 06-24-2004 12:31 :: peizo :: Replies: 0 :: Views: 711
Please let me know is it possible that a system can accept TCP/IP throgh its LAN port but does not accept voice/IP through that port?
Network :: 04-25-2006 11:35 :: farfar :: Replies: 6 :: Views: 1382
is it posible to use fiber optic cable use for internet in our campus
to be able to use also on our telephone system???
Yes if you switch to VOIP then you could route whole telephone traffic over the same fiber optic cable used for internet.
can you pls
Electronic Elementary Questions :: 10-03-2006 03:21 :: leoren_tm :: Replies: 5 :: Views: 558
Contains MPLS Tutorial
McGraw Hill - voice over MPLS Planning and Design Networks
Computer Networks, Fourth Edition
By Andrew S. Tanenbaum
Electromagnetic Design and Simulation :: 11-29-2006 03:17 :: amir_rastegar2003 :: Replies: 2 :: Views: 871
what are the benifits of voive over GPRS.
is it possible to use only data switch in our MSC (in GSM ) and remove the Circuit switch which is used for voice calls.
in which format our voice will be sent . how it will be possible and either it will be fruitfull to us or not.
Digital communication :: 03-20-2007 08:34 :: Virus King :: Replies: 0 :: Views: 553
The answer is yes.
Usually to transmit low data rate signals (such as voice) up to 100kB/s the modulation is ASK or FSK. Do you have some part number of the IC? Any schematic of the transmitter?
I hope it can help.
RF, Microwave, Antennas and Optics :: 08-23-2007 10:32 :: Mazz :: Replies: 8 :: Views: 1145
I want to transcieve voice via MIC and SPKR of sim300, in GPRS mode to another sim300 connected to GPRS.
Anybody can help in any way ?
Do I have to alter the SIM300 Bios to have this functionality or does it support this feature already?
Digital communication :: 10-15-2007 04:49 :: mbprogrammer :: Replies: 0 :: Views: 900
What do you mean about voice Chat?
VoIP needs a RTP connection to be established between users.
voice messages can be sent as a form of instant message.
For instance SIP is a signaling protocol used to create an RTP media connection between users. But SIP can carry messages embedded within it's body without the need of (...)
Network :: 10-25-2008 07:03 :: III :: Replies: 12 :: Views: 3507
In order to that you will need to sample the voice (using ADC) at known sample rate
(most voice can be sampled using 8 KHz sample rate)
To save band width you will also need to compress the voice using a known algorithm like ADPCM Or G721(more complex)
And then you can send the DATA via the (...)
Embedded Systems and Real-Time OS :: 04-17-2010 05:29 :: bobcat1 :: Replies: 3 :: Views: 3813
how can we send the voice trough GSM.
Microcontrollers :: 06-23-2011 04:58 :: thunderboympm :: Replies: 5 :: Views: 889
You may try to transmit and receive voice over fiber optic cables... that would simplest and intersting to start with...
RF, Microwave, Antennas and Optics :: 02-07-2012 13:43 :: vinoth8051 :: Replies: 3 :: Views: 427
i am planning to do a project on voip with real time devices. i am new to this.. can anyone tel me what r the devices that i ll need , and if any software if i ll have to learn.. i saw dis asterisks and was nt able to get wat its gonna be used for.. should i start learning basic ccna voice commands.?
Thanks in advance
Network :: 02-10-2014 13:57 :: netwrkng :: Replies: 0 :: Views: 364
i want to do voice transfer on electric lines
please help me
Professional Hardware and Electronics Design :: 07-11-2001 08:17 :: digitallan :: Replies: 5 :: Views: 1738
What standards or protocols of system on can-based network with reservation of channels exist ?
PC Programming and Interfacing :: 01-06-2004 04:24 :: immortal :: Replies: 3 :: Views: 883
Could someone suggest a 8 channels single chip voice processor?
Input: 8 channles telephony lines; output: compressed audio (G.729 or something similar).
Professional Hardware and Electronics Design :: 04-28-2005 03:21 :: xirix :: Replies: 1 :: Views: 1186
A Curious Thing: U.S. Radar Operators called "Chirp" the charateristic signal who was eared in headphones, because it was very similar to the Birds voice.
Digital Signal Processing :: 07-07-2005 10:26 :: paolone1340 :: Replies: 7 :: Views: 1605
A voice frequency (VF) or voice band is one of the frequencies, within part of the audio range, that is used for the transmission of speech.
In telephony, the usable voice frequency band ranges from approximately 300 Hz to 3400 Hz. The bandwidth allocated for a single voice-frequ
Electronic Elementary Questions :: 09-20-2005 18:18 :: skydiverc :: Replies: 2 :: Views: 1357
I have a project on VoIP (voice over IP). I have learnt H323 and SIP protocols.
Now I have to built a program run on one of the two protocols.
I use VB but I don't have tools on these protocols.
Could you please give me some links or upload here tools for me?
Thanks very much!
By the way, I also need some advices and experienc
PC Programming and Interfacing :: 09-05-2005 10:32 :: nhutdtvt :: Replies: 3 :: Views: 899
can anyone suggest me as to how to implement voice over IP or MP3 codec for ARM7.what all specific areas i need to know to accomplish this task?can anyone send me some mirror links ,where i could get source code?pls help me.
Embedded Systems and Real-Time OS :: 02-04-2006 21:52 :: john2020 :: Replies: 7 :: Views: 1313
yes i know that it call VOIP,but i mean by algorithm,is that if u want to transmit a voice over network u have to compress it .and by that i mean if any one know something about voice compression can help me ?? but anyway thank u for answering me....
Software Problems, Hints and Reviews :: 03-23-2006 18:50 :: ddro :: Replies: 4 :: Views: 781
Voip is voice over Internet Protocol, or using a telephone over the internet via your PC.
You can find it all over the web.
It's nothing to do with about EDAboard.
Electronic Elementary Questions :: 04-19-2006 05:01 :: cyberrat :: Replies: 1 :: Views: 827
If i were you i would be to confy about the VSAT solutions it ould be just to expensive and complicated for you if you don't have the support of a larger ISP.
Now, the wireless solutions is the way to go... At least in my opinion...
Now using 802.11 is simpler and very wide range solution for both, internet and voice channels, using
Digital communication :: 05-24-2006 10:21 :: DarkJedi :: Replies: 8 :: Views: 1823
Hello my friends...
i'm looking for any informations about voice codec.
can somebody give me something avail like articles, circuit diagrams, books or links related to this topic..
i need to build a voice codec (with its circuits - coder n decoder)
thank to all...
Digital Signal Processing :: 08-05-2006 01:43 :: razwell :: Replies: 1 :: Views: 730
i need a circuit that can convert analog signal (human voice) to digital signal (binary code)
if you wantto conver analog signal to digital just use adc and you don't need any thinh else.
vocoder compress digital voice.
Hobby Circuits and Small Projects Problems :: 08-09-2006 00:30 :: hr_rezaee :: Replies: 9 :: Views: 1378
Does any one have resources about voice over frame relay and atm? please help
Network :: 09-02-2006 01:59 :: hossam.algewely :: Replies: 2 :: Views: 1010
CCVP is 5 exams
I have them all , you can find them on
Network :: 03-25-2007 09:38 :: hossam.algewely :: Replies: 5 :: Views: 900
It stands for :
Regular Pulse Excitaion - Linear Predition Code
LPC is based on slow changing signals like voice , over a short window of samples can be used to expect the next sample with certain degree of error that can be minimized by acurate statistics , the idea is instead of sending the voice (...)
Digital communication :: 10-01-2006 09:10 :: hossam.algewely :: Replies: 2 :: Views: 986
lots of software solutions is availalble for voice chat over the lan , here's the link to some kinda softwares :
but voice over Internet Protocol, also called VoIP, IP Telephony, Internet telephony, Broadband telephony, Broadband Phone and voice over Broadband is the routing of (...)
Network :: 10-14-2006 07:36 :: faghani :: Replies: 2 :: Views: 1046
The voice is sampled at a rate ,say, 8kHz, 8-bit, which means a 64kbps stream. Every packet should have a delay less than 200ms to keep the communication quality.
Please find more materials.
Network :: 03-07-2007 04:49 :: spikeyang :: Replies: 4 :: Views: 1142
u must go to VOIP (voice over IP )
all the worl now use voip , i suggest it to u .
Network :: 12-24-2006 10:13 :: eng_tameremad :: Replies: 5 :: Views: 1956
as there is boom for 3g and 4g. so u should de a research based project in WCDMA which is the advance version of current GSM.
1-OFDMA channel codding
2-study of 3G and 4G technology.
3-Memo Channel Codding
4-interconversion from 2.5G to 4G
5-implimentation of WiMAX.
6-Wimax channel codding.
7-CDMA and GSM roming and handoff (one of the hot
Digital communication :: 03-27-2007 00:39 :: Virus King :: Replies: 3 :: Views: 1501
SIP is a signaling protocol used for VOIP, ie. it's used to establish a phone call, so one can say SIP is to VOIP what SS7 is to PSTN.
There are a few signaling protocols developed by different bodies SIP is developed by the IETF (the body that develops the internet standards) and the h32x family (h323 is for voice over ethernet with no (...)
Network :: 10-16-2008 15:00 :: III :: Replies: 2 :: Views: 1204
can anyone please help me out in....."how to do the matlab code for speech processing (i.e)...voice over ip (VoIP) using different audio codecs such as G.711, G.729,SPEEX etc". can u just tell me how to use the CODEC by taking a input signal (.wav files) and do the programming ..... if anyone knows abt (...)
Digital communication :: 12-05-2007 00:24 :: spa_123 :: Replies: 4 :: Views: 4486
The Fusion Session Initiation Protocol (SIP) software suite is at the heart of Unicoi's voice over Internet Packet (VoIP) offerings. Fusion SIP is a lightweight, transport-independent, text-based protocol designed for use in IP Phones, VoIP Gateways, and other IP-enabled products.
Fusion SIP source code is specifically designed for use in embedd
Network :: 02-27-2008 08:03 :: JABEZ.S.DAVID :: Replies: 2 :: Views: 2163
I suggest u to Study VOIP i.e voice over IP. it is very interesting.
Electronic Elementary Questions :: 02-11-2008 00:12 :: sandeep_sggs :: Replies: 6 :: Views: 3981
AFAIK ZigBee isn't made for voice transmission. Although the bandpass foreseen in the standard makes the voice transmission possible, it's not a good Idea to this. There are several other protocols that permits voice.
Network :: 03-01-2008 10:39 :: monnoliv :: Replies: 3 :: Views: 1873
i want to record voice, example "hello", to pic and change its frequency using pic. its like a voice changer but only short voice samples. can anyone help me?
Microcontrollers :: 03-19-2008 03:40 :: piskot :: Replies: 1 :: Views: 1099
Need your help for this...
I am working on wireless transceiver which is supposed to communicate to another similar wireless node at RF. The transceiver consists of a MSP430 microcontroller and CC2400 transceiver. I have programmed them in such a way that they communicate over the ISM band 2.4 GHz and have used a simple packet format. T
Electronic Elementary Questions :: 07-20-2009 08:24 :: Infinytus :: Replies: 1 :: Views: 1395