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Date: Fri, 3 Apr 2009 13:33:47 +0200
Message-ID: <3ea34a000904030433p90559dav20a3f1495366d772@mail.gmail.com>
Subject: Re: [gentoo-embedded] eyeborg
From: Christopher Friedt <chrisfriedt@gmail.com>
To: gentoo-embedded@lists.gentoo.org
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Hi Peter,
On Tue, Mar 17, 2009 at 12:31 AM, Peter Stuge <peter@stuge.se> wrote:
> Christopher Friedt wrote:
>> Can anyone on the list recommend a good kit for a tunable USB radio
>> transceiver?
>
> That quite generic. What frequency range? What will you transceive?
> What bitrate do you need? How cooked does your interface need to be?
It would have to be in the 1-2 GHz range - this is mainly a range
imposed by the size of the required antenna.
Most digital cmos image sensors essentially have two 'channels'. The
first is unidirectional, which carries the data away from the sensor,
and the second is bidirectional, and is often an i2c bus for control
and configuration. The i2c bus is very low-frequency, 10 kHz - 100
kHz, while the data channel is rather high (up to 60fps, with 640x480
resolution, and 24bpp, in RGB24 or YUV420p format, for example). It
might be possible to do jpeg compression at the source, if power /
space permits.
In any event, a digital signal will be modulate the transceiver
signal, with appropriate coding to ensure that the information is
received correctly - right now they're getting quite a bit of noise
using a simplistic analog camera / transmitter.
If you have any ideas about certain chips, I would love to hear them.
Size and power are of course the main concern.
Cheers,
Chris