Hi All, This new version is only available at the bottom of the development page: http://www.sm5bsz.com/linuxdsp/linroot.htm and its mirrors. At "Linrad home page" the version is still 02-34.
Linrad now has a speech processor, the first step towards a transmit chain. The dsp side of it seems to work fine, but the hardware (=Delta44) does not quite work as expected. Data sheets typically say that the D/A is better than the A/D, but in real life it seems to be the other way around. So far I have only tested un-modified soundcards and the next step will be to see if there are any mods that might help. Another possible improvement could be to use all four D/A channels and send both I and Q in two opposite phases so a differential amplifier could be used. Interferences might be in the same phase and cancel out... Other changes: A wheel mouse can now be used to tune the Linrad frequency in steps of the bin size in the main waterfall. By turning the depressed wheel one can make the step size multiples of the bin size. The network now sends the time when a recording was made, so now MAP65 should get the correct time stamps to decode automatically on "S-files" Feedback wanted: 1) Is there anyone interested in using Linrad on old computers? Things older than Pentium III. Linrad works OK on as old machines as Pentium 66 MHz for low bandwidths, but I have a problem with too many computers around to be able to start looking into tx hardware. I contemplate to get rid of Pentium I and Pentium MMX but if several people have an interest I will move them elsewhere to keep the possibillity to occasionally verify that those old computers still are OK with Linrad. 2) There is a part in Linrad "voicelab" by which one can study speech processors. I wrote it in a hope it would be possible to find ways to improve differently for different voices. As it turned out, the conclusion was that the only important aspect when it comes to copyability under marginal conditions is the average to peak power. The new speech processor is designed for that and Linrad will not use any part of voicelab any more. Is there any interest in voicelab? If not I will remove it. I will be away for about a week, probably without E-mail, leaving tomorrow (Friday) late evening. I look forward to bug reports on return home :-) 73 Leif / SM5BSZ ############################################################# This message is sent to you because you are subscribed to the mailing list <linrad@antennspecialisten.se>. To unsubscribe, E-mail to: <[EMAIL PROTECTED]> To switch to the DIGEST mode, E-mail to <[EMAIL PROTECTED]> To switch to the INDEX mode, E-mail to <[EMAIL PROTECTED]> Send administrative queries to <[EMAIL PROTECTED]>