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Posted by Uderman on April 25, 2007, 9:48 am
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Hello. I am involved on a voip project that aims to deliver a complete
voip solution using Asterisk software. We will develop the IP phones,
ATAs, and a GUI for the users configure Asterisk. My tasks relate to
the design and construction of the Ip phones and ATAs.
Our aim is to develop cheap terminals, so they can get popular. For
that, we plain to implement just the godec G.711 (PCM), as it require
less computational processing, and so a more cheap BOM hardware.
My problem is that honestly, I don't have much experience on designing
embedded systems, and I believe this kind of project is not very
simple. I am looking for some guidelines on how to obtain the hardware
requirements on building this system. That`s why I am posting here.
My assumptions right now is that I will not need a DSP chip, a normal
microcontroller will be fine becouse the codec implementation cam be
build on a separated chip, like texas instrument PCM codec chip
TLV320AIC22C. So I believe all I need is a microcontroller with an
ethernet interface for the network, and I2C and serial interface for
the codec, and a RTOS for SIP and RTP implementation. Remember that we
aim to buld the most cheap IP phone and ATA possible. Those are all
assumptions for now.
So, I would like to hear from you any coments, or any help you can
provide to help me complete my task, like how to choose the cheapest
microcontroller and perifericals that suits this task. Thank you.
Uderman
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Posted by Spam Catcher on April 26, 2007, 5:18 am
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@b40g2000prd.googlegroups.com:
> Hello. I am involved on a voip project that aims to deliver a complete
> voip solution using Asterisk software. We will develop the IP phones,
> ATAs, and a GUI for the users configure Asterisk. My tasks relate to
> the design and construction of the Ip phones and ATAs.
>
> Our aim is to develop cheap terminals, so they can get popular. For
> that, we plain to implement just the godec G.711 (PCM), as it require
> less computational processing, and so a more cheap BOM hardware.
>
> My problem is that honestly, I don't have much experience on designing
> embedded systems, and I believe this kind of project is not very
> simple. I am looking for some guidelines on how to obtain the hardware
> requirements on building this system. That`s why I am posting here.
>
> My assumptions right now is that I will not need a DSP chip, a normal
> microcontroller will be fine becouse the codec implementation cam be
> build on a separated chip, like texas instrument PCM codec chip
> TLV320AIC22C. So I believe all I need is a microcontroller with an
> ethernet interface for the network, and I2C and serial interface for
> the codec, and a RTOS for SIP and RTP implementation. Remember that we
> aim to buld the most cheap IP phone and ATA possible. Those are all
> assumptions for now.
Since there are hundreds (?) of IP Phone/ATA manufacturers out there...
have you considered buying their hardware and customizing it? Probably
cheaper than building your own.
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> voip solution using Asterisk software. We will develop the IP phones,
> ATAs, and a GUI for the users configure Asterisk. My tasks relate to
> the design and construction of the Ip phones and ATAs.
>
> Our aim is to develop cheap terminals, so they can get popular. For
> that, we plain to implement just the godec G.711 (PCM), as it require
> less computational processing, and so a more cheap BOM hardware.
>
> My problem is that honestly, I don't have much experience on designing
> embedded systems, and I believe this kind of project is not very
> simple. I am looking for some guidelines on how to obtain the hardware
> requirements on building this system. That`s why I am posting here.
>
> My assumptions right now is that I will not need a DSP chip, a normal
> microcontroller will be fine becouse the codec implementation cam be
> build on a separated chip, like texas instrument PCM codec chip
> TLV320AIC22C. So I believe all I need is a microcontroller with an
> ethernet interface for the network, and I2C and serial interface for
> the codec, and a RTOS for SIP and RTP implementation. Remember that we
> aim to buld the most cheap IP phone and ATA possible. Those are all
> assumptions for now.