Leif Actually I think you are over thinking this. The signal is really DSB with one sideband being only a couple hundred hertz so it is not a new mode. This would permit a Costas Loop to lock the received signal upon reception. I already have speech processing so it really boils down to two audio channels and two Hilbert transforms ouput as a single I/Q so I dont know where all the power and filtering, etc comes in..It just feeds a Softrock the same as any other mode of operation.. It could be included one of many existing SDR programs. ISB is and has been a real mode for many decades. As I mentioned, ISB is already on the list of features to be added to the PowerSDR software if one wanted to wait. Actually after my last post yesterday I did it with one Hilbert transform and barely any more CPU processing than for SSB. After I finish my experiments using a computer test bed, it will be professionally coded into an ASIC.
Leif Asbrink wrote: >On Sat, 17 Oct 2009 18:43:12 -0400 >w2xj <[email protected]> wrote: > > > >>A brief description is that I really want to create a VSB signal where >>the information is the same on both sides and must be in sync. The >>technical answer is much more complex.. I do not see a user interface >>issue, just another mode button on the GUI. Then the left sound card >>input is lower sideband and the right is upper or a stereo wave file >>would contain upper and lower sideband in the left and right audio >>channels. >> >> >?????????? > >Why do you think it is a good idea to use the two audio channels >to generate VSB? > >It seems to me that the signal you want to transmit is generated >by a computer. It seems natural to me that you would generate >it as a single channel audio signal of twice the bandwidth to make >it fit a SSB transmitter with suitable bandwidth. > >What you ask for would be a new transmit mode without any speech >processing. There has to be filtering, power regulation, amplitude >and phase balance and other things. I would not consider it without >an understanding of the technical details that would motivate such >a mode. > >73 > >Leif / SM5BSZ > > > >
