18-09-2018, 08:48 AM
(This post was last modified: 18-09-2018, 08:48 AM by ppppenguin.)
I thought Peter Scott's solution was to do with devising modelines for graphics cards so they could produce non-standard video output such as 405. I don't think it was for RF. I know that Fabrice Bellard devised a solution for RF generation using a PC graphics card.
For System A modulation I know of these approaches:
Conventional modulators using MC1496 balanced modulator chips. Such as those by David Looser and myself.
Conventional modulator using discretes. Such as that by Darius.
Synthesised modulator using Freescale (previously Motorola) MC44BS373CA chips which are now getting harder to find. This was first done by David Robinson in his "one off" converter. This method was later used in the Aurora and Hedghog converters. A pair of chips is needed, one for vision, one for sound. A single chip can't quite manage both.
I don't know if anyone has successfully synthesised a modulated System A signal using a PC
Darryl (the Aurora man) and I discussed direct synthesis using an FPGA. It never went further than a few ideas and calculations. I'm sure it's possible but not necessarily simple or easy.
For System A modulation I know of these approaches:
Conventional modulators using MC1496 balanced modulator chips. Such as those by David Looser and myself.
Conventional modulator using discretes. Such as that by Darius.
Synthesised modulator using Freescale (previously Motorola) MC44BS373CA chips which are now getting harder to find. This was first done by David Robinson in his "one off" converter. This method was later used in the Aurora and Hedghog converters. A pair of chips is needed, one for vision, one for sound. A single chip can't quite manage both.
I don't know if anyone has successfully synthesised a modulated System A signal using a PC
Darryl (the Aurora man) and I discussed direct synthesis using an FPGA. It never went further than a few ideas and calculations. I'm sure it's possible but not necessarily simple or easy.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
