Thanks. I think this is clarifying in my brain a little.
Looking functionally from the outside of it, we have a box with a USB-2
interface on it that is the digital conduit to whatever is inside the
box. There are two proposals for Software Defined Transceivers that
could be in the box, where an SDX has, from the USB point of view, four
audio data streams.
1) a high sample rate, high resolution, two channel PCM audio data
stream out of the box for I/Q received signals. The Janus board produces
this stream from a QSD analog stream from either the SDR-1000 or a
Softrock or something similar. For PhilC's board, this stream comes from
a down-sampling of the direct RF digital converter output.
2) a perhaps more modest, possibly single channel PCM audio data stream
into the box for post-processed received signals to be converted to
analog sound for speaker/headphones. This stream feeds a DAC on either
the Janus board or one on the PhilC board; so far this is the DAC part
of the TI codec in both instances, or maybe a 1-bit sigma-delta in an
FPGA.
1) & 2) make up the receiver audio data chain.
3) a perhaps modest, possibly single channel PCM audio data stream out
of the box from a microphone for transmitted signals. This from the ADC
half of the codec in both examples.
4) a better, two channel PCM audio data stream into the box for
post-processed transmitted signals. This could be I/Q to the QSE of the
SDR-1000 or a QSE from the Softrock folks. In PhilC's case, this could
be A/phi for a Class E modulator.
3) & 4) make up the transmitter audio data chain.
For the SWL folks, someone could make a board with just 1) & 2).
All four audio data streams could be made to conform to the USB Audio
Device Class spec and be supported by the generic driver that comes with
your OS.
Cool. So we have two/three ways of filling the box without changing too
much what it looks like from the USB side.
As I understand it, which is none too well, the keyer proposal would
have a component that, based on key closures
1) generates and feeds a digital side-tone internally to the DAQ
of stream 2) for monitoring and
2) generates and feeds the I/Q or A/phi keyed digital streams
into the dual DAC of stream 4) for transmission.
Neither of these audio data streams comes out of the box for latency
reasons, so they do not represent USB Audio Data Streams. However, the
process of selecting/mixing the keyer stream 1) into the receiver stream
2) and selecting keyer stream 2) instead of transmitter stream 3) as
input to transmitter stream 4) fall well within the scope of a USB Audio
Device Unit in the USB Audio Device spec. Maybe we can again leverage
generic drivers for controlling it.
Then there is the frequency locking stuff which feels to me like a USB
Reflock II-type board with USB data stream out of the box representing
the error count. For the SDR-1000, this is used by PowerSDR to send a
frequency correction back over the USB control channel to the PIO
replacement card. Others can do other exciting things with the digital
error signal.
All these guys may have FPGAs on them [I agree with PhilC. There could
easily be one per board] => firmware => downloads, so up pops the USB
Device Firmware Update Device spec.
And, finally, there is the crew that want the box to be a free-standing
radio with no attached computer. They need a DSP card that inside the
box connects audio data streams 1) to 2) and 3) to 4) doing processing
along the way. They still need the Device Firmware Update Device spec to
load the DSP modules.
Lots of USB activity, and that's what the Lionheart board does.
Sorry for the ramble, but it's starting to gel for me, anyway.
Chris - AE6VK
-----Original Message-----
From: Eric Ellison [mailto:ecellison@comcast.net]
Sent: Tuesday, January 24, 2006 9:30 PM
To: 'Xylo-SDR Discussion'
Subject: Re: [Xylo-SDR] RFC - Motherboard
Chris
That's ok, so have I! I just know that no one has spent any money till
we get it all sorted out and firmed up. We don't have a name for the
motherboard connection but Sherwood has been suggested.
Let me give it a shot, since in the next few days it will get a bit more
focus. Phil_H has been trying all evening to post his concept drawing.
The Janus is basically SDR-1000 glue ideas. Things that have been
mentioned and some things which Phil - VK6APH and Bill - KD5TFD have
proven in concept
are:
High quality A/D chip and streaming wideband digitized I/Q audio to
PowerSDR.
High quality D/A and A/D to microphone input, speaker/earphone output,
side tone etc.
High speed Iambic Keying to PowerSDR.
Control of the relays in SDR.
GPS clock reference to the SDR.
(More coming I think)
The Lionheart is the FPGA/USB Cyclone-FX2xx pulse of the system. Named
for and by Leon - G1HSM who is designing. It is still being defined, and
will forever be used to define programmable hardware in this project.
Stand alone or bus mounted utility.
So far it has Cyclone II (var) chip. (A logic hardware 'etch-a-sketch')
Programmable via USB to a memory chip.
FX2 USB connector.
A reset switch.
A couple of indicator LEDs
I2C connector? (I hope)
Ethernet connector (I hope)
Phil_C is doing a high speed A/D front end radio which he has the honors
of naming (hopefully soon). Concept description is in the last couple of
messages.
News yesterday at 11!
Eric
-----Original Message-----
From: xylo-sdr-bounces@lists.ae5k.us
[mailto:xylo-sdr-bounces@lists.ae5k.us]
On Behalf Of Christopher T. Day
Sent: Tuesday, January 24, 2006 11:55 PM
To: Xylo-SDR Discussion
Subject: Re: [Xylo-SDR] RFC - Motherboard
Sorry, could someone post a brief description of what's on the Janus and
what's on the Lionhart? I've lost track. Thanks.
Chris - AE6VK
-----Original Message-----
From: Philip Covington [mailto:p.covington@gmail.com]
Sent: Tuesday, January 24, 2006 8:27 PM
To: Xylo-SDR Discussion
Subject: Re: [Xylo-SDR] RFC - Motherboard
On 1/24/06, Eric Ellison <ecellison@comcast.net> wrote:
Phil
You are right. I ceased to panic after the first flurry on that
matter.
FPGA's in the capability range we are talking about are not that
expensive.
However, in this exchange which you have explained well right here:
If you used ALL the resources on the Lions 'heart' can you do what you
are planning below? Your project does NOT have to co-exist with any
others, just a different FPGA program and leverage of programs in
common with other projects like FX2. Other slots used for the BPF
board etc. If so, that WOULD make the daughter card + Buss concept
viable. After all the Janus is a totally different project, and will
never need to co-exist with your radio!
It would also make the Lionheart a little more flexible in that it
would allow for a 'squatter'. I realize it depends on physical space,
but 'squatting' on cleverly spaced pins could do it. Nothing has all
that much height, in any of these projects except front panel stuff.
Just wondering.
Eric
Eric,
Actually the Janus will probably be a part of my project. I will need a
way to get audio out for RX and audio in for TX - I'll need at least the
TI CODEC part of it. Also, I can envision having both a LTC2208 board
and a QSD based board in one radio. The LTC2208 could be used to scan
big chunks of spectrum and direct the QSD based board to tune to a
signal of interest while the LTC2208 continues the scan. I also need to
be able to decode command signals via USB to an IO controller board -
that function will be handled by the Lionheart board.
Phil C
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